dynamic spline highchart from database

dynamic spline highchart from database - php

I try to make a spline highchart and implement solution from How to load data from JSON to Highchart?, that's an answer from Mina Gabriel. The codes look like this.
In test.php
}
// Set the JSON header
header("Content-type: text/json");
// The x value is the current JavaScript time, which is the Unix time multiplied by 1000.
$x = time() * 1000;
$y = rand(0,100) ;
// Create a PHP array and echo it as JSON
$ret = array($x, $y);
echo json_encode($ret);
?>
And in the highchart script:
<script>
/**
* Request data from the server, add it to the graph and set a timeout to request again
*/
var chart; // global
function requestData() {
$.ajax({
url: 'http://localhost:8080/test.php',
success: function(point) {
var series = chart.series[0],
shift = series.data.length > 20; // shift if the series is longer than 20
// add the point
chart.series[0].addPoint(point, true, shift);
// call it again after one second
setTimeout(requestData, 1000);
},
cache: false
});
}
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
defaultSeriesType: 'spline',
events: {
load: requestData
}
},
title: {
text: 'Live random data'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 100,
maxZoom: 20 * 1000
},
yAxis: {
minPadding: 0.2,
maxPadding: 0.2,
title: {
text: 'Value',
margin: 80
}
},
series: [{
name: 'Random data',
data: []
}]
});
});
</script>
< /head>
<body>
And those just work well. But when I try to change the code in the test.php to set the y-value as a number from database like this:
<?php
header("Content-type: text/json");
$db = mysql_connect("localhost","myusername","mypassword");
mysql_select_db("mydatabase");
$day=date('Y-m-d'); //UTC standar time
$result = mysql_query("SELECT COUNT(*) FROM table WHERE time='{$day}';");
$count = mysql_fetch_array($result);
// The x value is the current JavaScript time, which is the Unix time multiplied by 1000.
$x = time() * 1000;
$y = $count[0];
// Create a PHP array and echo it as JSON
$ret = array($x, $y);
echo json_encode($ret);
?>
the line chart doesnt work. I've checked the sql code and it just works right. Did I miss something?

From the given information and this post, my best bet to the issue is that the $count[0] is a string, highcharts needs it to be strictly numeric. Could you try the following for me
$y = intval($count[0]); // OR floatval($count[0]);

Related

how to this line chart update mysql data using php ajax [duplicate]

I created an basic bar chart using chartjs and it works fine. Now I want to update the values on a time based interval. My problem is that after I created the chart, I do not know how to update its values correctly...
My code:
var ctx = $("#myChart").get(0).getContext("2d");
var dts = [
{
fillColor: "rgba(220,220,220,0.5)",
strokeColor: "rgba(220,220,220,1)",
data: [0, 0, 0, 0, 0]
}
];
var data = {
labels: ["Core#1", "Core#2", "Core#3", "Core#4", "Total"],
datasets: dts
};
var chart = new Chart(ctx);
chart.Bar(data);
//test code
setInterval( function () {
data.datasets[0].data = [random(), random(), random(), random(), random()];
chart.Bar(data);
},2000);
in the test code, I am updating the values with datasets[0].data- is this the right way to do it? The problem with this is that everytime I call chart.Bar(), the values are reset to 0 then animated to the random value (like I am recreating the chart). This way, all animations are always from 0 to value which looks strange. I would expect that if I update a value from 50 to 10 the bar would go down to 10 from 50 and not setted to 0 then animated to 10.
I did not found anything in the docs about this... am I doing something wrong or this is impossible with this library?

Update: Looks like chartjs has been updated (see comment below). There are some examples up that look very nice:
Here's an example of updating a line chart using new data: http://jsbin.com/yitep/5/edit
Here's how we can update existing data on a line chart: http://jsbin.com/yitep/4/edit
Original Post
As of Nov 2013, there seem to be very few options for updating charts.
There is a good example here (duplicated below) of adding new points to a line chart. Still kind of jumpy but not too bad. However, I think the effect probably depends on the chart you are using.
It does look like this is somewhere in the development pipeline. I don't see any indication of a release date yet though: https://github.com/nnnick/Chart.js/issues/13 [Closed as of Jul 26, 2014]
JS
$(document).ready(function(){
var count = 10;
var data = {
labels : ["1","2","3","4","5", "6", "7", "8", "9", "10"],
datasets : [
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
data : [65,59,90,81,56,45,30,20,3,37]
},
{
fillColor : "rgba(151,187,205,0.5)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
data : [28,48,40,19,96,87,66,97,92,85]
}
]
}
// this is ugly, don't judge me
var updateData = function(oldData){
var labels = oldData["labels"];
var dataSetA = oldData["datasets"][0]["data"];
var dataSetB = oldData["datasets"][1]["data"];
labels.shift();
count++;
labels.push(count.toString());
var newDataA = dataSetA[9] + (20 - Math.floor(Math.random() * (41)));
var newDataB = dataSetB[9] + (20 - Math.floor(Math.random() * (41)));
dataSetA.push(newDataA);
dataSetB.push(newDataB);
dataSetA.shift();
dataSetB.shift(); };
var optionsAnimation = {
//Boolean - If we want to override with a hard coded scale
scaleOverride : true,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : 10,
//Number - The value jump in the hard coded scale
scaleStepWidth : 10,
//Number - The scale starting value
scaleStartValue : 0
}
// Not sure why the scaleOverride isn't working...
var optionsNoAnimation = {
animation : false,
//Boolean - If we want to override with a hard coded scale
scaleOverride : true,
//** Required if scaleOverride is true **
//Number - The number of steps in a hard coded scale
scaleSteps : 20,
//Number - The value jump in the hard coded scale
scaleStepWidth : 10,
//Number - The scale starting value
scaleStartValue : 0
}
//Get the context of the canvas element we want to select
var ctx = document.getElementById("myChart").getContext("2d");
var optionsNoAnimation = {animation : false}
var myNewChart = new Chart(ctx);
myNewChart.Line(data, optionsAnimation);
setInterval(function(){
updateData(data);
myNewChart.Line(data, optionsNoAnimation)
;}, 2000
);
});
// ChartJS
var Chart=function(s){function v(a,c,b){a=A((a-c.graphMin)/(c.steps*c.stepValue),1,0);return b*c.steps*a}function x(a,c,b,e){function h(){g+=f;var k=a.animation?A(d(g),null,0):1;e.clearRect(0,0,q,u);a.scaleOverlay?(b(k),c()):(c(),b(k));if(1>=g)D(h);else if("function"==typeof a.onAnimationComplete)a.onAnimationComplete()}var f=a.animation?1/A(a.animationSteps,Number.MAX_VALUE,1):1,d=B[a.animationEasing],g=a.animation?0:1;"function"!==typeof c&&(c=function(){});D(h)}function C(a,c,b,e,h,f){var d;a=
Math.floor(Math.log(e-h)/Math.LN10);h=Math.floor(h/(1*Math.pow(10,a)))*Math.pow(10,a);e=Math.ceil(e/(1*Math.pow(10,a)))*Math.pow(10,a)-h;a=Math.pow(10,a);for(d=Math.round(e/a);d<b||d>c;)a=d<b?a/2:2*a,d=Math.round(e/a);c=[];z(f,c,d,h,a);return{steps:d,stepValue:a,graphMin:h,labels:c}}function z(a,c,b,e,h){if(a)for(var f=1;f<b+1;f++)c.push(E(a,{value:(e+h*f).toFixed(0!=h%1?h.toString().split(".")[1].length:0)}))}function A(a,c,b){return!isNaN(parseFloat(c))&&isFinite(c)&&a>c?c:!isNaN(parseFloat(b))&&
isFinite(b)&&a<b?b:a}function y(a,c){var b={},e;for(e in a)b[e]=a[e];for(e in c)b[e]=c[e];return b}function E(a,c){var b=!/\W/.test(a)?F[a]=F[a]||E(document.getElementById(a).innerHTML):new Function("obj","var p=[],print=function(){p.push.apply(p,arguments);};with(obj){p.push('"+a.replace(/[\r\t\n]/g," ").split("<%").join("\t").replace(/((^|%>)[^\t]*)'/g,"$1\r").replace(/\t=(.*?)%>/g,"',$1,'").split("\t").join("');").split("%>").join("p.push('").split("\r").join("\\'")+"');}return p.join('');");return c?
b(c):b}var r=this,B={linear:function(a){return a},easeInQuad:function(a){return a*a},easeOutQuad:function(a){return-1*a*(a-2)},easeInOutQuad:function(a){return 1>(a/=0.5)?0.5*a*a:-0.5*(--a*(a-2)-1)},easeInCubic:function(a){return a*a*a},easeOutCubic:function(a){return 1*((a=a/1-1)*a*a+1)},easeInOutCubic:function(a){return 1>(a/=0.5)?0.5*a*a*a:0.5*((a-=2)*a*a+2)},easeInQuart:function(a){return a*a*a*a},easeOutQuart:function(a){return-1*((a=a/1-1)*a*a*a-1)},easeInOutQuart:function(a){return 1>(a/=0.5)?
0.5*a*a*a*a:-0.5*((a-=2)*a*a*a-2)},easeInQuint:function(a){return 1*(a/=1)*a*a*a*a},easeOutQuint:function(a){return 1*((a=a/1-1)*a*a*a*a+1)},easeInOutQuint:function(a){return 1>(a/=0.5)?0.5*a*a*a*a*a:0.5*((a-=2)*a*a*a*a+2)},easeInSine:function(a){return-1*Math.cos(a/1*(Math.PI/2))+1},easeOutSine:function(a){return 1*Math.sin(a/1*(Math.PI/2))},easeInOutSine:function(a){return-0.5*(Math.cos(Math.PI*a/1)-1)},easeInExpo:function(a){return 0==a?1:1*Math.pow(2,10*(a/1-1))},easeOutExpo:function(a){return 1==
a?1:1*(-Math.pow(2,-10*a/1)+1)},easeInOutExpo:function(a){return 0==a?0:1==a?1:1>(a/=0.5)?0.5*Math.pow(2,10*(a-1)):0.5*(-Math.pow(2,-10*--a)+2)},easeInCirc:function(a){return 1<=a?a:-1*(Math.sqrt(1-(a/=1)*a)-1)},easeOutCirc:function(a){return 1*Math.sqrt(1-(a=a/1-1)*a)},easeInOutCirc:function(a){return 1>(a/=0.5)?-0.5*(Math.sqrt(1-a*a)-1):0.5*(Math.sqrt(1-(a-=2)*a)+1)},easeInElastic:function(a){var c=1.70158,b=0,e=1;if(0==a)return 0;if(1==(a/=1))return 1;b||(b=0.3);e<Math.abs(1)?(e=1,c=b/4):c=b/(2*
Math.PI)*Math.asin(1/e);return-(e*Math.pow(2,10*(a-=1))*Math.sin((1*a-c)*2*Math.PI/b))},easeOutElastic:function(a){var c=1.70158,b=0,e=1;if(0==a)return 0;if(1==(a/=1))return 1;b||(b=0.3);e<Math.abs(1)?(e=1,c=b/4):c=b/(2*Math.PI)*Math.asin(1/e);return e*Math.pow(2,-10*a)*Math.sin((1*a-c)*2*Math.PI/b)+1},easeInOutElastic:function(a){var c=1.70158,b=0,e=1;if(0==a)return 0;if(2==(a/=0.5))return 1;b||(b=1*0.3*1.5);e<Math.abs(1)?(e=1,c=b/4):c=b/(2*Math.PI)*Math.asin(1/e);return 1>a?-0.5*e*Math.pow(2,10*
(a-=1))*Math.sin((1*a-c)*2*Math.PI/b):0.5*e*Math.pow(2,-10*(a-=1))*Math.sin((1*a-c)*2*Math.PI/b)+1},easeInBack:function(a){return 1*(a/=1)*a*(2.70158*a-1.70158)},easeOutBack:function(a){return 1*((a=a/1-1)*a*(2.70158*a+1.70158)+1)},easeInOutBack:function(a){var c=1.70158;return 1>(a/=0.5)?0.5*a*a*(((c*=1.525)+1)*a-c):0.5*((a-=2)*a*(((c*=1.525)+1)*a+c)+2)},easeInBounce:function(a){return 1-B.easeOutBounce(1-a)},easeOutBounce:function(a){return(a/=1)<1/2.75?1*7.5625*a*a:a<2/2.75?1*(7.5625*(a-=1.5/2.75)*
a+0.75):a<2.5/2.75?1*(7.5625*(a-=2.25/2.75)*a+0.9375):1*(7.5625*(a-=2.625/2.75)*a+0.984375)},easeInOutBounce:function(a){return 0.5>a?0.5*B.easeInBounce(2*a):0.5*B.easeOutBounce(2*a-1)+0.5}},q=s.canvas.width,u=s.canvas.height;window.devicePixelRatio&&(s.canvas.style.width=q+"px",s.canvas.style.height=u+"px",s.canvas.height=u*window.devicePixelRatio,s.canvas.width=q*window.devicePixelRatio,s.scale(window.devicePixelRatio,window.devicePixelRatio));this.PolarArea=function(a,c){r.PolarArea.defaults={scaleOverlay:!0,
scaleOverride:!1,scaleSteps:null,scaleStepWidth:null,scaleStartValue:null,scaleShowLine:!0,scaleLineColor:"rgba(0,0,0,.1)",scaleLineWidth:1,scaleShowLabels:!0,scaleLabel:"<%=value%>",scaleFontFamily:"'Arial'",scaleFontSize:12,scaleFontStyle:"normal",scaleFontColor:"#666",scaleShowLabelBackdrop:!0,scaleBackdropColor:"rgba(255,255,255,0.75)",scaleBackdropPaddingY:2,scaleBackdropPaddingX:2,segmentShowStroke:!0,segmentStrokeColor:"#fff",segmentStrokeWidth:2,animation:!0,animationSteps:100,animationEasing:"easeOutBounce",
animateRotate:!0,animateScale:!1,onAnimationComplete:null};var b=c?y(r.PolarArea.defaults,c):r.PolarArea.defaults;return new G(a,b,s)};this.Radar=function(a,c){r.Radar.defaults={scaleOverlay:!1,scaleOverride:!1,scaleSteps:null,scaleStepWidth:null,scaleStartValue:null,scaleShowLine:!0,scaleLineColor:"rgba(0,0,0,.1)",scaleLineWidth:1,scaleShowLabels:!1,scaleLabel:"<%=value%>",scaleFontFamily:"'Arial'",scaleFontSize:12,scaleFontStyle:"normal",scaleFontColor:"#666",scaleShowLabelBackdrop:!0,scaleBackdropColor:"rgba(255,255,255,0.75)",
scaleBackdropPaddingY:2,scaleBackdropPaddingX:2,angleShowLineOut:!0,angleLineColor:"rgba(0,0,0,.1)",angleLineWidth:1,pointLabelFontFamily:"'Arial'",pointLabelFontStyle:"normal",pointLabelFontSize:12,pointLabelFontColor:"#666",pointDot:!0,pointDotRadius:3,pointDotStrokeWidth:1,datasetStroke:!0,datasetStrokeWidth:2,datasetFill:!0,animation:!0,animationSteps:60,animationEasing:"easeOutQuart",onAnimationComplete:null};var b=c?y(r.Radar.defaults,c):r.Radar.defaults;return new H(a,b,s)};this.Pie=function(a,
c){r.Pie.defaults={segmentShowStroke:!0,segmentStrokeColor:"#fff",segmentStrokeWidth:2,animation:!0,animationSteps:100,animationEasing:"easeOutBounce",animateRotate:!0,animateScale:!1,onAnimationComplete:null};var b=c?y(r.Pie.defaults,c):r.Pie.defaults;return new I(a,b,s)};this.Doughnut=function(a,c){r.Doughnut.defaults={segmentShowStroke:!0,segmentStrokeColor:"#fff",segmentStrokeWidth:2,percentageInnerCutout:50,animation:!0,animationSteps:100,animationEasing:"easeOutBounce",animateRotate:!0,animateScale:!1,
onAnimationComplete:null};var b=c?y(r.Doughnut.defaults,c):r.Doughnut.defaults;return new J(a,b,s)};this.Line=function(a,c){r.Line.defaults={scaleOverlay:!1,scaleOverride:!1,scaleSteps:null,scaleStepWidth:null,scaleStartValue:null,scaleLineColor:"rgba(0,0,0,.1)",scaleLineWidth:1,scaleShowLabels:!0,scaleLabel:"<%=value%>",scaleFontFamily:"'Arial'",scaleFontSize:12,scaleFontStyle:"normal",scaleFontColor:"#666",scaleShowGridLines:!0,scaleGridLineColor:"rgba(0,0,0,.05)",scaleGridLineWidth:1,bezierCurve:!0,
pointDot:!0,pointDotRadius:4,pointDotStrokeWidth:2,datasetStroke:!0,datasetStrokeWidth:2,datasetFill:!0,animation:!0,animationSteps:60,animationEasing:"easeOutQuart",onAnimationComplete:null};var b=c?y(r.Line.defaults,c):r.Line.defaults;return new K(a,b,s)};this.Bar=function(a,c){r.Bar.defaults={scaleOverlay:!1,scaleOverride:!1,scaleSteps:null,scaleStepWidth:null,scaleStartValue:null,scaleLineColor:"rgba(0,0,0,.1)",scaleLineWidth:1,scaleShowLabels:!0,scaleLabel:"<%=value%>",scaleFontFamily:"'Arial'",
scaleFontSize:12,scaleFontStyle:"normal",scaleFontColor:"#666",scaleShowGridLines:!0,scaleGridLineColor:"rgba(0,0,0,.05)",scaleGridLineWidth:1,barShowStroke:!0,barStrokeWidth:2,barValueSpacing:5,barDatasetSpacing:1,animation:!0,animationSteps:60,animationEasing:"easeOutQuart",onAnimationComplete:null};var b=c?y(r.Bar.defaults,c):r.Bar.defaults;return new L(a,b,s)};var G=function(a,c,b){var e,h,f,d,g,k,j,l,m;g=Math.min.apply(Math,[q,u])/2;g-=Math.max.apply(Math,[0.5*c.scaleFontSize,0.5*c.scaleLineWidth]);
d=2*c.scaleFontSize;c.scaleShowLabelBackdrop&&(d+=2*c.scaleBackdropPaddingY,g-=1.5*c.scaleBackdropPaddingY);l=g;d=d?d:5;e=Number.MIN_VALUE;h=Number.MAX_VALUE;for(f=0;f<a.length;f++)a[f].value>e&&(e=a[f].value),a[f].value<h&&(h=a[f].value);f=Math.floor(l/(0.66*d));d=Math.floor(0.5*(l/d));m=c.scaleShowLabels?c.scaleLabel:null;c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(m,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(l,f,d,e,h,
m);k=g/j.steps;x(c,function(){for(var a=0;a<j.steps;a++)if(c.scaleShowLine&&(b.beginPath(),b.arc(q/2,u/2,k*(a+1),0,2*Math.PI,!0),b.strokeStyle=c.scaleLineColor,b.lineWidth=c.scaleLineWidth,b.stroke()),c.scaleShowLabels){b.textAlign="center";b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;var e=j.labels[a];if(c.scaleShowLabelBackdrop){var d=b.measureText(e).width;b.fillStyle=c.scaleBackdropColor;b.beginPath();b.rect(Math.round(q/2-d/2-c.scaleBackdropPaddingX),Math.round(u/2-k*(a+
1)-0.5*c.scaleFontSize-c.scaleBackdropPaddingY),Math.round(d+2*c.scaleBackdropPaddingX),Math.round(c.scaleFontSize+2*c.scaleBackdropPaddingY));b.fill()}b.textBaseline="middle";b.fillStyle=c.scaleFontColor;b.fillText(e,q/2,u/2-k*(a+1))}},function(e){var d=-Math.PI/2,g=2*Math.PI/a.length,f=1,h=1;c.animation&&(c.animateScale&&(f=e),c.animateRotate&&(h=e));for(e=0;e<a.length;e++)b.beginPath(),b.arc(q/2,u/2,f*v(a[e].value,j,k),d,d+h*g,!1),b.lineTo(q/2,u/2),b.closePath(),b.fillStyle=a[e].color,b.fill(),
c.segmentShowStroke&&(b.strokeStyle=c.segmentStrokeColor,b.lineWidth=c.segmentStrokeWidth,b.stroke()),d+=h*g},b)},H=function(a,c,b){var e,h,f,d,g,k,j,l,m;a.labels||(a.labels=[]);g=Math.min.apply(Math,[q,u])/2;d=2*c.scaleFontSize;for(e=l=0;e<a.labels.length;e++)b.font=c.pointLabelFontStyle+" "+c.pointLabelFontSize+"px "+c.pointLabelFontFamily,h=b.measureText(a.labels[e]).width,h>l&&(l=h);g-=Math.max.apply(Math,[l,1.5*(c.pointLabelFontSize/2)]);g-=c.pointLabelFontSize;l=g=A(g,null,0);d=d?d:5;e=Number.MIN_VALUE;
h=Number.MAX_VALUE;for(f=0;f<a.datasets.length;f++)for(m=0;m<a.datasets[f].data.length;m++)a.datasets[f].data[m]>e&&(e=a.datasets[f].data[m]),a.datasets[f].data[m]<h&&(h=a.datasets[f].data[m]);f=Math.floor(l/(0.66*d));d=Math.floor(0.5*(l/d));m=c.scaleShowLabels?c.scaleLabel:null;c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(m,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(l,f,d,e,h,m);k=g/j.steps;x(c,function(){var e=2*Math.PI/
a.datasets[0].data.length;b.save();b.translate(q/2,u/2);if(c.angleShowLineOut){b.strokeStyle=c.angleLineColor;b.lineWidth=c.angleLineWidth;for(var d=0;d<a.datasets[0].data.length;d++)b.rotate(e),b.beginPath(),b.moveTo(0,0),b.lineTo(0,-g),b.stroke()}for(d=0;d<j.steps;d++){b.beginPath();if(c.scaleShowLine){b.strokeStyle=c.scaleLineColor;b.lineWidth=c.scaleLineWidth;b.moveTo(0,-k*(d+1));for(var f=0;f<a.datasets[0].data.length;f++)b.rotate(e),b.lineTo(0,-k*(d+1));b.closePath();b.stroke()}c.scaleShowLabels&&
(b.textAlign="center",b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily,b.textBaseline="middle",c.scaleShowLabelBackdrop&&(f=b.measureText(j.labels[d]).width,b.fillStyle=c.scaleBackdropColor,b.beginPath(),b.rect(Math.round(-f/2-c.scaleBackdropPaddingX),Math.round(-k*(d+1)-0.5*c.scaleFontSize-c.scaleBackdropPaddingY),Math.round(f+2*c.scaleBackdropPaddingX),Math.round(c.scaleFontSize+2*c.scaleBackdropPaddingY)),b.fill()),b.fillStyle=c.scaleFontColor,b.fillText(j.labels[d],0,-k*(d+
1)))}for(d=0;d<a.labels.length;d++){b.font=c.pointLabelFontStyle+" "+c.pointLabelFontSize+"px "+c.pointLabelFontFamily;b.fillStyle=c.pointLabelFontColor;var f=Math.sin(e*d)*(g+c.pointLabelFontSize),h=Math.cos(e*d)*(g+c.pointLabelFontSize);b.textAlign=e*d==Math.PI||0==e*d?"center":e*d>Math.PI?"right":"left";b.textBaseline="middle";b.fillText(a.labels[d],f,-h)}b.restore()},function(d){var e=2*Math.PI/a.datasets[0].data.length;b.save();b.translate(q/2,u/2);for(var g=0;g<a.datasets.length;g++){b.beginPath();
b.moveTo(0,d*-1*v(a.datasets[g].data[0],j,k));for(var f=1;f<a.datasets[g].data.length;f++)b.rotate(e),b.lineTo(0,d*-1*v(a.datasets[g].data[f],j,k));b.closePath();b.fillStyle=a.datasets[g].fillColor;b.strokeStyle=a.datasets[g].strokeColor;b.lineWidth=c.datasetStrokeWidth;b.fill();b.stroke();if(c.pointDot){b.fillStyle=a.datasets[g].pointColor;b.strokeStyle=a.datasets[g].pointStrokeColor;b.lineWidth=c.pointDotStrokeWidth;for(f=0;f<a.datasets[g].data.length;f++)b.rotate(e),b.beginPath(),b.arc(0,d*-1*
v(a.datasets[g].data[f],j,k),c.pointDotRadius,2*Math.PI,!1),b.fill(),b.stroke()}b.rotate(e)}b.restore()},b)},I=function(a,c,b){for(var e=0,h=Math.min.apply(Math,[u/2,q/2])-5,f=0;f<a.length;f++)e+=a[f].value;x(c,null,function(d){var g=-Math.PI/2,f=1,j=1;c.animation&&(c.animateScale&&(f=d),c.animateRotate&&(j=d));for(d=0;d<a.length;d++){var l=j*a[d].value/e*2*Math.PI;b.beginPath();b.arc(q/2,u/2,f*h,g,g+l);b.lineTo(q/2,u/2);b.closePath();b.fillStyle=a[d].color;b.fill();c.segmentShowStroke&&(b.lineWidth=
c.segmentStrokeWidth,b.strokeStyle=c.segmentStrokeColor,b.stroke());g+=l}},b)},J=function(a,c,b){for(var e=0,h=Math.min.apply(Math,[u/2,q/2])-5,f=h*(c.percentageInnerCutout/100),d=0;d<a.length;d++)e+=a[d].value;x(c,null,function(d){var k=-Math.PI/2,j=1,l=1;c.animation&&(c.animateScale&&(j=d),c.animateRotate&&(l=d));for(d=0;d<a.length;d++){var m=l*a[d].value/e*2*Math.PI;b.beginPath();b.arc(q/2,u/2,j*h,k,k+m,!1);b.arc(q/2,u/2,j*f,k+m,k,!0);b.closePath();b.fillStyle=a[d].color;b.fill();c.segmentShowStroke&&
(b.lineWidth=c.segmentStrokeWidth,b.strokeStyle=c.segmentStrokeColor,b.stroke());k+=m}},b)},K=function(a,c,b){var e,h,f,d,g,k,j,l,m,t,r,n,p,s=0;g=u;b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;t=1;for(d=0;d<a.labels.length;d++)e=b.measureText(a.labels[d]).width,t=e>t?e:t;q/a.labels.length<t?(s=45,q/a.labels.length<Math.cos(s)*t?(s=90,g-=t):g-=Math.sin(s)*t):g-=c.scaleFontSize;d=c.scaleFontSize;g=g-5-d;e=Number.MIN_VALUE;h=Number.MAX_VALUE;for(f=0;f<a.datasets.length;f++)for(l=
0;l<a.datasets[f].data.length;l++)a.datasets[f].data[l]>e&&(e=a.datasets[f].data[l]),a.datasets[f].data[l]<h&&(h=a.datasets[f].data[l]);f=Math.floor(g/(0.66*d));d=Math.floor(0.5*(g/d));l=c.scaleShowLabels?c.scaleLabel:"";c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(l,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(g,f,d,e,h,l);k=Math.floor(g/j.steps);d=1;if(c.scaleShowLabels){b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;
for(e=0;e<j.labels.length;e++)h=b.measureText(j.labels[e]).width,d=h>d?h:d;d+=10}r=q-d-t;m=Math.floor(r/(a.labels.length-1));n=q-t/2-r;p=g+c.scaleFontSize/2;x(c,function(){b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(q-t/2+5,p);b.lineTo(q-t/2-r-5,p);b.stroke();0<s?(b.save(),b.textAlign="right"):b.textAlign="center";b.fillStyle=c.scaleFontColor;for(var d=0;d<a.labels.length;d++)b.save(),0<s?(b.translate(n+d*m,p+c.scaleFontSize),b.rotate(-(s*(Math.PI/180))),b.fillText(a.labels[d],
0,0),b.restore()):b.fillText(a.labels[d],n+d*m,p+c.scaleFontSize+3),b.beginPath(),b.moveTo(n+d*m,p+3),c.scaleShowGridLines&&0<d?(b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+d*m,5)):b.lineTo(n+d*m,p+3),b.stroke();b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(n,p+5);b.lineTo(n,5);b.stroke();b.textAlign="right";b.textBaseline="middle";for(d=0;d<j.steps;d++)b.beginPath(),b.moveTo(n-3,p-(d+1)*k),c.scaleShowGridLines?(b.lineWidth=c.scaleGridLineWidth,
b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+r+5,p-(d+1)*k)):b.lineTo(n-0.5,p-(d+1)*k),b.stroke(),c.scaleShowLabels&&b.fillText(j.labels[d],n-8,p-(d+1)*k)},function(d){function e(b,c){return p-d*v(a.datasets[b].data[c],j,k)}for(var f=0;f<a.datasets.length;f++){b.strokeStyle=a.datasets[f].strokeColor;b.lineWidth=c.datasetStrokeWidth;b.beginPath();b.moveTo(n,p-d*v(a.datasets[f].data[0],j,k));for(var g=1;g<a.datasets[f].data.length;g++)c.bezierCurve?b.bezierCurveTo(n+m*(g-0.5),e(f,g-1),n+m*(g-0.5),
e(f,g),n+m*g,e(f,g)):b.lineTo(n+m*g,e(f,g));b.stroke();c.datasetFill?(b.lineTo(n+m*(a.datasets[f].data.length-1),p),b.lineTo(n,p),b.closePath(),b.fillStyle=a.datasets[f].fillColor,b.fill()):b.closePath();if(c.pointDot){b.fillStyle=a.datasets[f].pointColor;b.strokeStyle=a.datasets[f].pointStrokeColor;b.lineWidth=c.pointDotStrokeWidth;for(g=0;g<a.datasets[f].data.length;g++)b.beginPath(),b.arc(n+m*g,p-d*v(a.datasets[f].data[g],j,k),c.pointDotRadius,0,2*Math.PI,!0),b.fill(),b.stroke()}}},b)},L=function(a,
c,b){var e,h,f,d,g,k,j,l,m,t,r,n,p,s,w=0;g=u;b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;t=1;for(d=0;d<a.labels.length;d++)e=b.measureText(a.labels[d]).width,t=e>t?e:t;q/a.labels.length<t?(w=45,q/a.labels.length<Math.cos(w)*t?(w=90,g-=t):g-=Math.sin(w)*t):g-=c.scaleFontSize;d=c.scaleFontSize;g=g-5-d;e=Number.MIN_VALUE;h=Number.MAX_VALUE;for(f=0;f<a.datasets.length;f++)for(l=0;l<a.datasets[f].data.length;l++)a.datasets[f].data[l]>e&&(e=a.datasets[f].data[l]),a.datasets[f].data[l]<
h&&(h=a.datasets[f].data[l]);f=Math.floor(g/(0.66*d));d=Math.floor(0.5*(g/d));l=c.scaleShowLabels?c.scaleLabel:"";c.scaleOverride?(j={steps:c.scaleSteps,stepValue:c.scaleStepWidth,graphMin:c.scaleStartValue,labels:[]},z(l,j.labels,j.steps,c.scaleStartValue,c.scaleStepWidth)):j=C(g,f,d,e,h,l);k=Math.floor(g/j.steps);d=1;if(c.scaleShowLabels){b.font=c.scaleFontStyle+" "+c.scaleFontSize+"px "+c.scaleFontFamily;for(e=0;e<j.labels.length;e++)h=b.measureText(j.labels[e]).width,d=h>d?h:d;d+=10}r=q-d-t;m=
Math.floor(r/a.labels.length);s=(m-2*c.scaleGridLineWidth-2*c.barValueSpacing-(c.barDatasetSpacing*a.datasets.length-1)-(c.barStrokeWidth/2*a.datasets.length-1))/a.datasets.length;n=q-t/2-r;p=g+c.scaleFontSize/2;x(c,function(){b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(q-t/2+5,p);b.lineTo(q-t/2-r-5,p);b.stroke();0<w?(b.save(),b.textAlign="right"):b.textAlign="center";b.fillStyle=c.scaleFontColor;for(var d=0;d<a.labels.length;d++)b.save(),0<w?(b.translate(n+
d*m,p+c.scaleFontSize),b.rotate(-(w*(Math.PI/180))),b.fillText(a.labels[d],0,0),b.restore()):b.fillText(a.labels[d],n+d*m+m/2,p+c.scaleFontSize+3),b.beginPath(),b.moveTo(n+(d+1)*m,p+3),b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+(d+1)*m,5),b.stroke();b.lineWidth=c.scaleLineWidth;b.strokeStyle=c.scaleLineColor;b.beginPath();b.moveTo(n,p+5);b.lineTo(n,5);b.stroke();b.textAlign="right";b.textBaseline="middle";for(d=0;d<j.steps;d++)b.beginPath(),b.moveTo(n-3,p-(d+1)*
k),c.scaleShowGridLines?(b.lineWidth=c.scaleGridLineWidth,b.strokeStyle=c.scaleGridLineColor,b.lineTo(n+r+5,p-(d+1)*k)):b.lineTo(n-0.5,p-(d+1)*k),b.stroke(),c.scaleShowLabels&&b.fillText(j.labels[d],n-8,p-(d+1)*k)},function(d){b.lineWidth=c.barStrokeWidth;for(var e=0;e<a.datasets.length;e++){b.fillStyle=a.datasets[e].fillColor;b.strokeStyle=a.datasets[e].strokeColor;for(var f=0;f<a.datasets[e].data.length;f++){var g=n+c.barValueSpacing+m*f+s*e+c.barDatasetSpacing*e+c.barStrokeWidth*e;b.beginPath();
b.moveTo(g,p);b.lineTo(g,p-d*v(a.datasets[e].data[f],j,k)+c.barStrokeWidth/2);b.lineTo(g+s,p-d*v(a.datasets[e].data[f],j,k)+c.barStrokeWidth/2);b.lineTo(g+s,p);c.barShowStroke&&b.stroke();b.closePath();b.fill()}}},b)},D=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)},F={}};
HTML
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<h1>Live Updating Chart.js</h1>
<canvas id="myChart" width="400" height="150"></canvas>
</body>
</html>

The update() triggers an update of the chart.
chart.update( )
.update(config)
Triggers an update of the chart. This can be safely called after updating the data object. This will update all scales, legends, and then re-render the chart. A config object can be provided with additional configuration for the update process.
update() can be safely called after updating values of one or more existing points within the the data object, rendering the changes in one animated render loop.
// update the first dataset's value of 'March' to be 50
myBarChart.data.datasets[0].bars[2].value = 50;
// animate update of 'March' from 90 to 50.
myBarChart.update();

Here is how to do it in the last version of ChartJs:
setInterval(function(){
chart.data.datasets[0].data[5] = 80;
chart.data.labels[5] = "Newly Added";
chart.update();
}
Look at this clear video
or test it in jsfiddle

You also can use destroy() function. Like this
if( window.myBar!==undefined)
window.myBar.destroy();
var ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx).Bar(barChartData, {
responsive : true,
});

You just need to change the chartObject.data.datasets value and call update() like this:
chartObject.data.datasets = newData.datasets;
chartObject.data.labels = newData.labels;
chartObject.update();

Remove the canvas dom and add in again.
function renderChart(label,data){
$("#canvas-wrapper").html("").html('<canvas id="storeSends"></canvas>');
var lineChartData = {
labels : label,
datasets : [
{
fillColor : "rgba(49, 195, 166, 0.2)",
strokeColor : "rgba(49, 195, 166, 1)",
pointColor : "rgba(49, 195, 166, 1)",
pointStrokeColor : "#fff",
data : data
}
]
}
var canvas = document.getElementById("storeSends");
var ctx = canvas.getContext("2d");
myLine = new Chart(ctx).Line(lineChartData, {
responsive: true,
maintainAspectRatio: false
});
}

I think the easiest way is to write a function to update your chart including the chart.update()method. Check out this simple example I wrote in jsfiddle for a Bar Chart.
//value for x-axis
var emotions = ["calm", "happy", "angry", "disgust"];
//colours for each bar
var colouarray = ['red', 'green', 'yellow', 'blue'];
//Let's initialData[] be the initial data set
var initialData = [0.1, 0.4, 0.3, 0.6];
//Let's updatedDataSet[] be the array to hold the upadted data set with every update call
var updatedDataSet;
/*Creating the bar chart*/
var ctx = document.getElementById("barChart");
var barChart = new Chart(ctx, {
type: 'bar',
data: {
labels: emotions,
datasets: [{
backgroundColor: colouarray,
label: 'Prediction',
data: initialData
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true,
min: 0,
max: 1,
stepSize: 0.5,
}
}]
}
}
});
/*Function to update the bar chart*/
function updateBarGraph(chart, label, color, data) {
chart.data.datasets.pop();
chart.data.datasets.push({
label: label,
backgroundColor: color,
data: data
});
chart.update();
}
/*Updating the bar chart with updated data in every second. */
setInterval(function() {
updatedDataSet = [Math.random(), Math.random(), Math.random(), Math.random()];
updateBarGraph(barChart, 'Prediction', colouarray, updatedDataSet);
}, 1000);
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.min.js"></script>
<body>
<div>
<h1>Update Bar Chart</h1>
<canvas id="barChart" width="800" height="450"></canvas>
</div>
<script src="barchart.js"></script>
</body>
</head>
</html>
Hope this helps.

If destroy() and clear() is not working (just like what i had experience) you can use jquery to remove the canvas and append it again.
$('#chartAmazon').remove();
$('#chartBar').append('<canvas id="chartAmazon"></canvas>');
var ctxAmazon = $("#chartAmazon").get(0).getContext("2d");
var AmazonChart = new Chart(ctxAmazon, {
type: 'doughnut',
data: dataAmazon,
options: optionsA
});

I don't think it's possible right now.
However that's a feature which should come soon, as the author hinted here:
https://github.com/nnnick/Chart.js/issues/161#issuecomment-20487775

This is an example with ChartJs - 2.9.4
var maximumPoints = 5;// with this variable you can decide how many points are display on the chart
function addData(chart, label, data) {
chart.data.labels.push(label);
chart.data.datasets.forEach((dataset) => {
var d = data[0];
dataset.data.push(d);
data.shift();
});
var canRemoveData = false;
chart.data.datasets.forEach((dataset) => {
if (dataset.data.length > maximumPoints) {
if (!canRemoveData) {
canRemoveData = true;
chart.data.labels.shift();
}
dataset.data.shift();
}
});
chart.update();
}
window.onload = function () {
var canvas = document.getElementById('elm-chart'),
ctx = canvas.getContext('2d');
var myLineChart = new Chart(ctx, {
type: 'line',
data: {
labels: [],
datasets: [
{
data: [],
label: 'Dataset-1',
backgroundColor: "#36a2eb88",
borderColor: "#36a2eb",
},
{
data: [],
label: 'Dataset-2',
backgroundColor: "#ff638488",
borderColor: "#ff6384",
}
],
},
options: {
responsive: false,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
var index = 0;
setInterval(function () {
var data = [];
myLineChart.data.datasets.forEach((dataset) => {
data.push(Math.random() * 100);
});
addData(myLineChart, index, data);
index++;
}, 1000);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<canvas id="elm-chart" width="640" height="480"></canvas>

There are 2 ways to solve it:
chart.update()
Delete existing chart using chart.destroy() and create new chart object.

The simplest way is to replace the canvas element and then call new Chart() again:
function reloadMyChart() {
$('myChart').replaceWith('<canvas id="myChart"></canvas>');
new Chart(document.getElementById("myChart"), {
data: yourChartData,
type: yourChartType,
options: yourChartOptions
});
}
Of course, you must replace yourChartData, yourChartType and yourChartOptions with the correct values required to initialize Chart.js. See Chart.js Docs.
You can call reloadMyChart function on a button click or any other event you need. Probably you'll add parameters to this function and use these to make a REST call to dynamically update your chart, like this:
function reloadMyChart(param1, param2) {
$('myChart').replaceWith('<canvas id="myChart"></canvas>');
$.get("restUrl?param1=" + param1 + "&param2=" + param2 + ",
function(data) {
// call new Chart() here and use returned data
}
);
Hope it helps! =)

Showing realtime update chartJS
function add_data(chart, label, data)
{
var today = new Date();
var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
myLineChart.data.datasets[0].data.push(Math.random() * 100);
myLineChart.data.datasets[1].data.push(Math.random() * 100);
myLineChart.data.labels.push(time)
myLineChart.update();
}
setInterval(add_data, 10000); //milisecond
full code , you can download in description link

As of 2022 and using ChartJS v3.7.1 you can use the code below.
Note that it is based on the JSBin snippets in doub1ejack's answer but these were not up to date and wouldn't work with the latest ChartJS version, mainly because the path to charts' data changed (now being yourChart._metasets[0]._dataset.data).
var canvas = document.getElementById('updating-chart'),
ctx = canvas.getContext('2d'),
startingData = {
labels: [1, 2, 3, 4, 5, 6, 7],
datasets: [
{
fillColor: "rgba(220,220,220,0.2)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
data: [65, 59, 80, 81, 56, 55, 40]
},
{
fillColor: "rgba(151,187,205,0.2)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(151,187,205,1)",
pointStrokeColor: "#fff",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
// Reduce the animation steps for demo clarity.
const myLiveChart = new Chart(ctx, {
type: 'bar',
data: startingData,
options: {
scales: {
y: {
beginAtZero: true
}
},
maintainAspectRatio: false,
}
});
setInterval(function(){
// Get a random index point
var indexToUpdate = Math.round(Math.random() * startingData.labels.length);
// Update one of the points in the second dataset
myLiveChart._metasets[0]._dataset.data[indexToUpdate] = Math.random() * 100;
myLiveChart.update();
}, 5000);
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Updating chart example</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>
<body>
<canvas id="updating-chart" width="500" height="300"></canvas>
</body>
</html>

You can check instance of Chart by using Chart.instances.
This will give you all the charts instances.
Now you can iterate on that instances and and change the data, which is present inside config.
suppose you have only one chart in your page.
for (var _chartjsindex in Chart.instances) {
/*
* Here in the config your actual data and options which you have given at the
time of creating chart so no need for changing option only you can change data
*/
Chart.instances[_chartjsindex].config.data = [];
// here you can give add your data
Chart.instances[_chartjsindex].update();
// update will rewrite your whole chart with new value
}

My solve was to actually store the charts outside of the state of Vue. Store the charts in a const variable in like a utility.js file. Then I was able to simply do this:
const PVR_CANVASES = {}
//This was my vue method for building the charts
build_metrics() {
this.votingResults.metrics.forEach(metric => {
const el = document.getElementById(metric.metric_data.canvas);
const n_chart = new Chart(el, {
type: 'line',
data: metric.chart.data,
options: {
responsive: true,
maintainAspectRatio: true,
layout: {
autoPadding: false
},
plugins: {
legend: {
display: false,
}
},
scales: {
x: {
display: false
},
y: {
display: false
}
},
elements: {
line: {
tension: 0.4
},
point: {
backgroundColor: 'rgba(0, 0, 0, 0.1)'
}
}
}
});
PVR_CANVASES[metric.chart.id] = n_chart;
})
}
//UPDATE CHART IS THIS SIMPLE
this.votingResults.metrics.forEach(metric => {
const n_chart = PVR_CANVASES[metric.chart.id];
n_chart.data = metric.chart.data;
n_chart.update();
});

So simple, Just replace the chart canvas element.
$('#canvas').replaceWith(' id="canvas" height="200px"
width="368px">');

How to populate Jvector Map with countries from database?

(I am new to Javascript and jQuery..) I have a dashboard and I want to display a map that shows the countries where participants of a particular event are coming from. With this, I opted with Jvector Map. I am having a hard time displaying the countries in the map, coming from my database.
dashboard.js
var mapData = {};
$('#world-map').vectorMap({
map: 'world_mill_en',
backgroundColor: "transparent",
regionStyle: {
initial: {
fill: '#e4e4e4',
"fill-opacity": 0.9,
stroke: 'none',
"stroke-width": 0,
"stroke-opacity": 0
}
},
series: {
regions: [{
values: function() {
$.ajax({
url:"includes/sql/fetchcountries.php",
method:"GET",
data:mapData,
dataType:"json",
success: function(data){
mapData = data;
console.log(mapData);
}
})
},
scale: ["#1ab394", "#22d6b1"],
normalizeFunction: 'polynomial'
}]
},
});
fetch.php
<?php
require '../auth/dbh.inc.auth.php';
$id = $_SESSION['ntc_id'];
$stmt = $conn->prepare("SELECT DISTINCT(participants.p_country) FROM ntc_participants
INNER JOIN participants ON participants.p_id=ntc_participants.p_id_fk
WHERE ntc_participants.ntc_id_fk=?");
$data = array();
mysqli_stmt_bind_param($stmt, "i", $id);
$stmt->execute();
$result = $stmt->get_result();
if($result->num_rows === 0);
if($row = $result->fetch_assoc()) {
$data[] = [
$row['p_country'] => 0 ]; //the value 0 is just a placeholder.. The jvector map feeds on this format: "US":298, "SA": 200
}
echo json_encode($data);
?>
Could anyone be gracious enough to walk me through all the wrong things I'm doing in my code? Appreciate all the help! :)

Ajax is asynchronous, so You are creating the map before the data has been downloaded.
Initialize the map with empty values for Your region:
$('#world-map').vectorMap({
...
values: {}
...
});
Then, whenever You need to show the data, set it dynamically:
$.get("includes/sql/fetchcountries.php", function(data) {
var mapObj = $("#world-map").vectorMap("get", "mapObject");
mapObj.series.regions[0].setValues(data);
});
During the ajax invocation and data download maybe You can show a spinner (please look at beforeSend inside the jQuery full ajax documentation: https://api.jquery.com/jquery.ajax/).
Here is the reference for setValues:
http://jvectormap.com/documentation/javascript-api/jvm-dataseries/

http://api.worldbank.org/v2/country/all/indicator/NY.GDP.PCAP.PP.CD?format=json&date=2018
This link will give you up-to-date stats for most common indicators via json - and then you can pluck whatever data that you like. I don't have all the code yet, as I am working on this today too.
This answers the question above whenever your database can also present JSON
document.addEventListener('DOMContentLoaded', () => {
console.log("loaded")
fetchCountryData()
})
function fetchCountryData () {
fetch('http://api.worldbank.org/v2/country/all/indicator/NY.GDP.PCAP.PP.CD?format=json&date=2018')
//
.then(resp => resp.json())
.then(data => {
let country.id = data[1]
let indicator.id = data[1]
create-GDP-Data(country.id,indicator.id)
})
}
function create-GDP-Data(country.id,indicator.id){
let gdpData = ?
}
$('#world-map-gdp').vectorMap({
map: 'world_mill',
series: {
regions: [{
values: gdpData,
scale: ['#C8EEFF', '#0071A4'],
normalizeFunction: 'polynomial'
}]
},
onRegionTipShow: function(e, el, code){
el.html(el.html()+' (GDP - '+gdpData[code]+')');
}
});

Flot.js with php and mysql not working with time

I have a system trying to display a graph of a count over time using flot js. The issue I am having is that the graph isnt actually rendering any lines. I have cast the time to UTC and multiplied by 1000 as suggested in other posts but to no avail. Does anyone have any idea what I am doing wrong?
PHP:
public function liveGraphAjax()
{
$query = "SELECT
time as time,
COUNT( id ) as count
FROM table
WHERE HOUR( TIME ) = HOUR( CURRENT_TIME ) -1
GROUP BY DATE_FORMAT(`time`, '%H:%i')";
$result = DB::select($query);
if(isset($result))
{
$temp = array();
foreach ($resultas $row )
{
$temp [] = array(
'time' =>strtotime($row->time) * 1000,
'count' =>(int) $row->count,
);
}
}
return Response::json($temp);
}
JS:
var options = {
colors : [$UpdatingChartColors],
xaxis: {
mode: "time",
timeformat:"%hh:%mm"
},
series: {
lines: { show: true },
points: { show: true }
},
};
$("button.dataUpdate").click(function ()
{
data = [];
$.plot("#updating-chart", data, options);
function fetchData()
{
function onDataReceived(series)
{
var res = [];
data = [series];
for (var i = 0; i < data[0].length; ++i)
{
res.push([data[0][i].time,data[0][i].count]);
}
console.log(res);
$.plot("#updating-chart", res, options);
}
$.ajax({
url: "liveGraphAjax",
type: "GET",
dataType: "json",
success: onDataReceived
});
}
});

The fetchData() function is never called so you never get data.
In your onDataReceived() function the res variable contains only one data series. You have to change your call to $.plot("#updating-chart", [res], options);

sending json object to google maps vai ajax response from php script

I'm stumped. I am not sure why my JSON object is not being parsed by my callback function.
I am getting the following error in the console log:
TypeError: data is undefined
for (var i = 0, len = data.features.length; i < len; i++) {
Your help is greatly appreciated!
The ajax code:
$.ajax({
type : 'POST',
url : 'timezone.php',
dataType : 'json',
data : { "func" : "getFirstAndNext", epochTime : browserUTC },
success : function( data ) {
console.log( data.first );
console.log( data.next );
sector_callback( data.first );
// do something with data.myObject.memberVariable
},
error : function ( XMLHttpRequest, textStatus, errorThrown ) {
// didn't work!
}
});
The PHP script:
<?php
//header('Content-Type: application/json; charset=utf-8');
function getFileStamp($type) {
$timeInterval = 15; // minutes
$now = round($_POST['epochTime'] / 1000);
$now = round(1352324181061 /1000 ); // 3:36:21
//$now = round(1352238011.067);
$offsetInSeconds = $timeInterval * 60;
$offsetInMillis = $timeInterval * 60 * 1000;
$currentFileTime = $now - $now % ($timeInterval * 60);
//$currentFileTime = ($now - ($now % $offsetInMillis))/1000.0; // this returns epoch time in $timeInterval minutes.
$nextFileTime = $currentFileTime + $offsetInSeconds; // next epoch time for file;
return ($type == 0) ? $currentFileTime : $nextFileTime;
}
$currentFileTime = getFileStamp(0) . '.json';
$nextFileTime = getFileStamp(1) . '.json';
$res = array();
$res['file1'] = file_get_contents($currentFileTime);
$res['file2'] = file_get_contents($nextFileTime);
echo json_encode(array("first"=>$res['file1'],"next"=>$res['file1'])); //takes contents and converts it to json object
?>
The sector callback function:
var allPolygons = [];
function sector_callback() {
//console.log(data);
var bounds = new google.maps.LatLngBounds();
for (var i = 0, len = data.features.length; i < len; i++) {
var coords = data.features[i].geometry.coordinates[0];
siteNames = data.features[i].properties.Name; // added for site names
var path = [];
for ( var j = 0, len2 = coords.length; j < len2; j++ ){ // pull out each set of coords and create a map object
var pt = new google.maps.LatLng(coords[j][1], coords[j][0])
bounds.extend(pt);
path.push(pt);
}
var polygons = new google.maps.Polygon({
path: path,
strokeColor: "#000000",
strokeOpacity: 0.8,
strokeWeight: 1,
fillColor: "#000000",
fillOpacity: 0.35,
map: map
});
createClickablePoly(polygons, siteNames);
google.maps.event.addListener(polygons, 'mouseover', function() {
var currentPolygon = this;
currentPolygon.setOptions({
fillOpacity: 0.45,
fillColor: "#FF0000"
})
});
google.maps.event.addListener(polygons, 'mouseout', function() {
var currentPolygon = this;
currentPolygon.setOptions({
fillOpacity: 0.35,
fillColor: "#000000"
})
});
allPolygons.push(polygons);
}
}

Going off only what I can see here, I'm not seeing how your sector_callback() can access the data anyway. When jQuery passes in the data, if all else is well, your console should log those properties just fine. But when you pass some of that data to your sector_callback(), it's getting lost. The reason is that your sector_callback() either needs to read the arguments[] array to get it, or you need to change the function signature to sector_callback(data).
In your jQuery block, pass data and not data.features:
sector_callback( data );
And change your own callback signature:
function sector_callback(data) {
console.log(data); // will log the whole chunk of the server data returned
...
}
This is because data is in a closure when it comes back to your jQuery callback. Even if you've declared it somewhere outside of that closure, it's going to retain local scope and cannot be accessed by your other function unless you pass it explicitly.
Hope I've understood the crux of the problem here and this was helpful ...

Highcharts Pie Chart via AJAX/JSON: But Slice Errors and Json Format Not Correct?

I'm a newbie php/js/mysql programmer.
I'm trying to create a pie chart in highcharts using jquery, where the data is discovered dynamically via ajax from echo json_encode in php (includes a select query from mysql).
Two problems:
1) The pie chart has these trailing "Slice: 0 %" flares everywhere. Don't know where these are coming from, what it means, nor how to fix it.
2) Json is new to me. The json data feed appears to be getting through (firebug sees it), but the format looks like this. I'm trying to boil it down to name and percent number only. Like this ['Pages', 45.0] but not sure how. Is this done in the json/php or should it be done in the sql query itself?
[{"contenttype":"BLOGPOST","count(*)":"2076"},{"contenttype":"COMMENT","count(*)":"2054"},{"contenttype":"MAIL","count(*)":"29448"},{"contenttype":"PAGE","count(*)":"33819"}]
Any help much appreciated
The highcharts js file is here:
//Define the chart variable globally,
var chart;
//Request data from the server, add it to the graph and set a timeout to request again
function requestData() {
$.ajax({
url: 'hc1.php',
success: function(point) {
var series = chart.series[0],
shift = series.data.length > 20; // shift if the series is longer than 20
// add the point
chart.series[0].addPoint(point, true, shift);
// call it again after one second
setTimeout(requestData, 1000);
},
cache: false
});
}
$(document).ready(function(){
//Create the test chart
chart = new Highcharts.Chart({
chart: {
renderTo: 'mycontainer2',
plotBackgroundColor: null,
plotBorderWidth: null,
plotShadow: false,
events: {load: requestData}
},
title: {text: 'Content Types in Wiki'},
tooltip: {formatter: function() {return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';}
},
plotOptions: {
pie: {
allowPointSelect: true,
cursor: 'pointer',
dataLabels: {
enabled: true,
//color: Highcharts.theme.textColor || '#000000',
//connectorColor: Highcharts.theme.textColor || '#000000',
formatter: function() {
return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';
}
}
}
},
series: [{
type: 'pie',
name: 'Content',
data: []
}]
});
The php file is here:
<?php
// Set the JSON header
header("Content-type: text/json");
// Connect to db
include('dbconnect.php');
// Count version 1 of content types of interest
$query = ("select contenttype, count(*)
from CONTENT
where version='1' and contenttype='page' or contenttype='comment' or contenttype='blogpost' or contenttype='mail' or contenttype='drafts'
group by CONTENT.contenttype;");
// execute query
$result = mysql_query($query) or die ("Error in query: $query. ".mysql_error());
// create a php array and echo it as json
//$row = mysql_fetch_assoc($result);
//echo json_encode($row);
$results = array(); while ( $row = mysql_fetch_assoc( $result )) { $results[] = $row; }
echo json_encode($results);
?>

First problem, how do you get your data into a format that highcharts is going to accept (namely arrays of arrays, [[name,percent],[nextname,percent],etc])? I would handle this in your PHP:
<snip>
// execute query
$result = mysql_query($query) or die ("Error in query: $query. ".mysql_error());
$total = 0;
$results = array();
while ( $row = mysql_fetch_assoc( $result )) {
$results[$row["contenttype"] = $row["count()"];
$total += $row["count()"];
}
$forHigh = array();
foreach ($results as $k => $v) {
$forHigh[]=array($k,($v/$total) * 100); // get percent and push onto array
}
echo json_encode($forHigh); // this should be an array of array
Now that our JSON returned structure is ready for HighCharts, we just need to call the plot creation once after our JSON call to create the plot. I would do it in the success callback of the $.ajax call.
$.ajax({
url: 'hc1.php',
success: function(jsonData) {
chart = new Highcharts.Chart({
<snip>
series: [{
type: 'pie',
name: 'Content',
data: jsonData
}]
<snip>
},
cache: false
});

We Keep Coding

PHP, A popular general-purpose scripting language that is especially suited to web development.

dynamic spline highchart from database - php

From the given information and this post, my best bet to the issue is that the $count[0] is a string, highcharts needs it to be strictly numeric. Could you try the following for me $y = intval($count[0]); // OR floatval($count[0]);

Related

how to this line chart update mysql data using php ajax [duplicate]

How to populate Jvector Map with countries from database?

Flot.js with php and mysql not working with time

sending json object to google maps vai ajax response from php script

Highcharts Pie Chart via AJAX/JSON: But Slice Errors and Json Format Not Correct?

Categories

Resources