I'm not so good at English but I will give it a try, feel free to edit and improve my post!
I'm trying to create a little chat, now I do not want to reload when there's no new data. It will receive the data from update.php, this works correctly.
I'm trying to do a little check (sample to show what I want to accomplish):
This is standard:
var ok = update.php
load ok(4000s);
What I am trying to accomplish here is:
var ok = update.php
function timer{
var new = update.php
if(new != ok){
ok = new;
},4000};
Of course this is fake code, it would never run, but it's the easiest way to explain what I mean.
$(document).ready(function() {
$("#chatbox").html('').load("update.php");
var refreshId = setInterval(function() {
var xx = $("#chatbox").html('').load("update.php");
$('#holder').load('update.php');
if( xx != "#holder"){
$("#chatbox").html('').load('update.php');
// $("#chatbox").html('').load('update.php')
$("#chatbox").scrollTop($("#chatbox")[0].scrollHeight);
}else{
alert)('nooope');
}
}, 4000);
$.ajaxSetup({ cache: false });
});
I tried everything, still getting nope.
(chatbox is a div, where de data gets loaded into.)
(holder is the same concept, only this one is hided trough css, so that the user won't notice.)
Related
I asked this question but did not explain it thoroughly. I have a regular link:
Click Me
I want the change the href after the link is clicked 10 times not by the individual use but clicked 10 total times by all users.My jquery is obviously flawed but here is what i have:
var count = 0;
$(document).ready(function(){
$('a').click(function(){
count++;
if(count > 10){
$('a').attr("href","https://www.yahoo.com");
}
});
});
I am new to jQuery but from what ive read cookies and local storage store individual users information not the total websites information. So how could i use ajax with a database to do this? maybe even php?
You have a huge fundamental misunderstanding of how JavaScript works.
Firstly, when someone clicks that link, they're going to be navigated away from your page unless you do something to prevent that (e.preventDefault or return false in jQuery). Once they're navigated away, your counter is lost because is stored locally, in memory, for the life of the page.
Secondly, even if the counter wasn't cleared, or you stored the counter in a cookie, or localStorage, it will only count for a single user. If you want to count the clicks by all users, you're going to have to do that server side. i.e., in PHP.
So... how do we do that? Well, as I said before, when a user clicks that link, they're going to be sent to Google. Your site will have no knowledge of what has occurred.
We have two options to deal with this. We can intercept the click, and use AJAX (more appropriately "XHR") to send a request back to your server, where you can log the click, before forwarding them off to Google.
Or, you re-write the URL to something like /log_click.php?forward=http://google.com. Now when the user clicks the link, they will actually be sent to your log_click.php script, where you can log the click to your database, and then use $_GET['forward'] in combination with header('location: ...') to forward them off to their destination. This is the easiest solution. Through some JavaScript hackery, you can hide the link so that when they mouse over it, they won't even know they're being sent to your site (Google does this).
Once you've accumulated your 10 clicks, you again use PHP to write out a different HTML link the next time someone views that page.
HTML
<a href='http://www.google.com' data-ref='99'>Click Me</a>
Javascript
$("a").click(function() {
var _this = $(this);
var ref = $(this).data('ref');
$.ajax({
url: '/click_url.php',
type: 'POST',
data: {id:ref}
success: function(href) {
if(href != '')
_this.attr("href",href);
}
});
}
PHP (click_url.php)
if($_POST['id'] > 0){
$id = $_POST['id'];
//count increment
$sql = "UPDATE table SET count = count + 1 WHERE id = '$id'";
mysql_query($sql);
//get row count
$sql = "SELECT * FROM table WHERE id = '$id' LIMIT 1";
$result = mysql_query($sql);
$row = mysql_fetch_array($result);
//if count > 10 , return new url
if($row['count'] > 10){
die($row['href']);
}
}
While clicking the link you can call an ajax request and increment the count in the server. So that u should remove link from href and call manually by using javascript window.location.href each time. Hope that helps
var count = 0;
$(document).ready(function(){
$('a').click(function(e){
e.preventDefault();
count++;
if(count > 10){
$('a').attr("href","https://www.yahoo.com");
}
});
});
and use ajax like below
//send set state request
$.ajax({
type: "POST",
contentType: "text/xml; charset=utf-8",
datatype: "xml",// you can set json and etc
url:"your php file url",
data: {test:test1},// your data which you want to get and post
beforeSend: function (XMLHttpRequest) {
// your action
},
success: function (data, textStatus, XmlHttpRequest) {
// your action },
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(errorThrown);
}
});
for more deatils see Ajax
Mark's answer is more useful, even you want to implement for the sake of some constraints then try below with jQuery 1.9
I have implemented for 3 clicks, AFAIU you need to change the URL on every 3rd successive click
var c=0;
$(document).on('click', 'a#ten', function(e){
c++;
alert('clicked ' + c + ' times');
if(c%3 == 0) {
$('a').attr("href","https://www.yahoo.com");
alert('changed');
c = 0;
}
e.preventDefault();
})
working DEMO
You must save no of times that link has been clicked in the database with php. when you render the link(with php) check the no of times it has been called before and decide what link to render.
Click Me
write this javascript in the page wher you place your link
$(function()
{
$('.mylink').click(function()
{
$.ajax({
type: "POST",
url: "listening/end/point", // enter your counting url here
async: false
);
});
});
And in server on the listening end point write php script to store no of times that link has been called.
I have a Javascript function I'm rendering on a page where the user can click on a list element and it will bring them to a new page showing more information about that list element. The original page is #index and the second page is #index2 which is coded using one multipage HTML page.
However I am hoping that I can move the index2 page to its own html file - index2.html but I'm not sure how I can reference the new index.html file within the function so that the elements can move to the new file.
My code is as follows:
<script type="text/javascript">
$(document).on('pagebeforeshow', '#index', function(){
$("#list").empty();
var url="http://localhost/tmp/json4.php";
$.getJSON(url,function(json){
//loop through deals
$.each(json.deals,function(i,dat){
$("#list").append("<li><a id='"+dat.dealid+"' data-restaurantid=" + dat.restaurantid + " data-image=" + dat.image + "><h1>"+dat.name+"</h1><h6>"+dat.dname+"</h6><h5>"+dat.description+"</h5></a></li>");
$(document).on('click', '#'+dat.dealid, function(event){
if(event.handled !== true)
{
dealObject.dealID = $(this).attr('id');
dealObject.restaurantid = $(this).attr('data-restaurantid');
dealObject.shortName = $(this).find('h1').html();
dealObject.image = $(this).attr('data-image');
dealObject.dealName = $(this).find('h6').html();
dealObject.description = $(this).find('h5').html();
$.mobile.changePage( "#index2", { transition: "slide"} );
event.handled = true;
}
});
});
$("#list").listview('refresh');
});
});
$(document).on('pagebeforeshow', '#index2', function(){
$('#index2 [data-role="content"]').find('#deal-img').attr('src',dealObject.dealObject);
$('#index2 [data-role="content"]').find('#title').html(dealObject.name);
$('#index2 [data-role="content"]').find('input#desc').val(dealObject.description);
$('#index2 [data-role="content"]').find('input#tname').val(dealObject.dealName);
$('#index2 [data-role="content"]').find('input#dealid').val(dealObject.dealID);
});
var dealObject = {
dealID : null,
restaurantid : null,
shortName : null,
image : null,
dealName : null,
description: null
}
</script>
If somebody could help me I'd really appreciate it.
You will need to separate pages into two php files, one called view.php and second one called offer.php.
Create 2 additional directories, one called amend and second one called del. Both of them will have a js file with logic related to the amend or delete functionality plus a php file which will server as a php/ajax proxy for a needed functionality.
Also take care that your 2 ajax calls must look at a correct location and that ajax response also must state witch action has beed done.
My guess is that you will need to make an Ajax request to your server for index2.html, since it no longer lives on the same page as index1.html. Here's an example
$.ajax({
url : '/pages/index2.html',
type: 'get',
success: function (html) {
// here , you can use jquery to manipulate
// the HTML in index2. Maybe pop up a lightbox, etc..
}
});
I'm not sure what you're trying to do, but Ajax is a fairly standard way of requesting new HTML / data behind the scenes. There is a lot you can do with JQuery ajax. Here are the docs
Jquery Ajax
Background Info
I'm fiddling around with some PHP and AJAX at the moment, to try and get the code working for an auto refreshing div (every 10 seconds), that contains comments.
Here is javascript code I am using to refresh the div..
<script type="text/javascript">// <![CDATA[
$(document).ready(function() {
$.ajaxSetup({ cache: false });
setInterval(function() {
$('#content_main').load('/feed_main.php');
}, 5000);
});
// ]]></script>
The code that will populate the div called "content_main", which is in feed_main.php, essentially accesses the database and echo's out the latest comments ...
Question
Is it possible, to only load the div "content_main" if the data inside of it, hasn't changed since the last time it was loaded?
My logic
Because I'm relatively new to javascript and AJAX I don't quite know how to do this, but my logic is:
For the first time it is run..
load data from feed_main.php file
Create a unique value (perhaps a hash value? ) to identify say 3 unique comments
Every other time it is run...
load the data from feed_main.php file
create a NEW unique value
check this value with the previous one
if they're the same, don't refresh the div, just leave things as they are, but if they're different then refresh..
The reason why I want to do this is because the comments usually have pictures attached, and it is quite annoying to see the image reload every time.
Any help with this would be greatly appreciated.
I've faced similar problem not too long ago, i assume that you using mysql or something for your comments storage serverside ?
I solved my problem by first adding timestamp integer column to my mysql table, then when i added a new row, i'd just simply use time() to save the current time.
mysql row insert example:
$query = "INSERT INTO comments (name, text, timestamp) VALUES ('". $name ."', '". $text ."',". time() .");";
step two would be to json_encode the data you sending from serverside:
$output = array();
if ($html && $html !== '') { // do we have any script output ?
$output['payload'] = $html; // your current script output would go in this variable
}
$output['time'] = time(); // so we know when did we last check for payload update
$json = json_encode($output, ((int)JSON_NUMERIC_CHECK)); // jsonify the array
echo $json; // send it to the client
So, now instead of pure html, your serverside script returns something like this:
{
"payload":"<div class=\"name\">Derpin<\/div><div class=\"msg\">Foo Bar!<\/div>",
"time":1354167493
}
You can grab the data in javascript simply enough:
<script type="text/javascript"> // <![CDATA[
var lastcheck;
var content_main = $('#content_main');
pollTimer = setInterval(function() {
updateJson();
}, 10000);
function updateJson() {
var request = '/feed_main.php?timestamp='+ (lastcheck ? lastcheck : 0);
$.ajax({
url: request,
dataType: 'json',
async: false,
cache: false,
success: function(result) {
if (result.payload) { // new data
lastcheck = result.time; // update stored timestamp
content_main.html(result.payload + content_main.html()); // update html element
} else { // no new data, update only timestamp
lastcheck = result.time;
}
}
});
}
// ]]> </script>
that pretty much takes care of communication between server and client, now you just query your database something like this:
$timestamp = 0;
$where = '';
if (isset($_GET['timestamp'])) {
$timestamp = your_arg_sanitizer($_GET['timestamp']);
}
if ($timestamp) {
$where = ' WHERE timestamp >= '.$timestamp;
}
$query = 'SELECT * FROM comments'. $where .' ORDER BY timestamp DESC;';
The timestamps get passed back and forth, client always sending the timestamp returned by the server in previous query.
Your server only sends comments that were submitted since you checked last time, and you can prepend them to the end of the html like i did. (warning: i have not added any kind of sanity control to that, your comments could get extremely long)
Since you poll for new data every 10 seconds you might want to consider sending pure data across the ajax call to save substantial chunk bandwidth (json string with just timestamp in it, is only around 20 bytes).
You can then use javascript to generate the html, it also has the advantage of offloading lot of the work from your server to the client :). You will also get much finer control over how many comments you want to display at once.
I've made some fairly large assumptions, you will have to modify the code to suit your needs. If you use my code, and your cat|computer|house happens to explode, you get to keep all the pieces :)
How about this:
<script type="text/javascript">
// <![CDATA[
$(function () {
function reload (elem, interval) {
var $elem = $(elem);
// grab the original html
var $original = $elem.html();
$.ajax({
cache : false,
url : '/feed_main.php',
type : 'get',
success : function (data) {
// compare the result to the original
if ($original == data) {
// just start the timer if the data is the same
setTimeout(function () {
reload(elem, interval)
}, interval);
return;
}
// or update the html with new data
$elem.html(data);
// and start the timer
setTimeout(function () {
reload(elem, interval)
}, interval);
}
});
}
// call it the first time
reload('#content_main', 10000);
});
// ]]>
</script>
This is just an idea to get you going it doesn't deal with errors or timeouts.
Best And Easy Code
setInterval(function()
{
$.ajax({
type:"post",
url:"uourpage.php",
datatype:"html",
success:function(data)
{
$("#div").html(data);
}
});
}, 5000);//time in milliseconds
Ok , I'm having trouble to solve this , I'm a php / C# web developer , and have no experience or knowledge in Javascript, I have to do just this one thing that needs Javascript:
When a certain page loads, a counter starts. The client must stay on this page for 20 seconds. after, I want to execute php code.
So there are 2 issues concerning me, first: how do I stop the counter, if client leaves the page (meaning the page is not in focus).
2) How can I execute php in javascript? , or call a php function from Javascript.
The code I have so far is this:
<html>
<head>
</head>
<body>
<div id='timer'>
<script type="text/javascript">
COUNTER_START = 20
function tick () {
if (document.getElementById ('counter').firstChild.data > 0) {
document.getElementById ('counter').firstChild.data = document.getElementById ('counter').firstChild.data - 1
setTimeout ('tick()', 1000)
} else {
document.getElementById ('counter').firstChild.data = 'done'
}
}
if (document.getElementById) onload = function () {
var t = document.createTextNode (COUNTER_START)
var p = document.createElement ('P')
p.appendChild (t)
p.setAttribute ('id', 'counter')
var body = document.getElementsByTagName ('BODY')[0]
var firstChild = body.getElementsByTagName ('*')[0]
body.insertBefore (p, firstChild)
tick()
}
</script>
</div>
</body>
</html>
and I also want the timer to start ticking when the client gets back on page
Thank you very much for ur help in advance
You could do this using jQuery.
Recycling an old Stackoverflow post, try this:
var window_focus;
var counter = 1000;
// on focus, set window_focus = true.
$(window).focus(function() {
window_focus = true;
});
// when the window loses focus, set window_focus to false
$(window).focusout(function() {
window_focus = false;
});
// this is set to the ('click' function, but you could start the interval/timer in a jQuery.ready function: http://api.jquery.com/ready/
$(document).one('click',function() {
// Run this function every second. Decrement counter if window_focus is true.
setInterval(function() {
$('body').append('Count: ' + counter + '<br>');
if(window_focus) { counter = counter-1; }
}, 1000);
});
Demo and old post
DEMO | Old So post
Update
Probably because the demo runs in 4 iframes, the $(window).focus bit only works on the iframe actually running the code (the bottom-right window).
jQuery
jQuery.com (How jQuery works) | Example (back to basics halfway down the page) | If you use the 2nd link, also read this
In regards to your first question about detecting if the window is out of focus, see this answer: Is there a way to detect if a browser window is not currently active?
It is possible, but only very new browsers support this so it may not be useful based on current browser support.
To trigger PHP code from Javascript, you would have to make an AJAX call to a server-side PHP script to invoke PHP since JS is client-side and PHP is server-side.
I'm working with jqueries address change event and am hitting a roadblock when a user copies and pastes a URL in the browser. I need to fist load a portion of the page that contains a form. I could do this after every pagination call but it seems really ineffecient.
Here is my current code block:
$.address.change(function(e) {
var urlAux = e.value.split('=');
var page = urlAux[0];
var start = urlAux[1];
if (page == "/visits") {
$.address.title("Profile Views");
if (start) {
$('#start').val(start);
// ***** If a user has copied and pasted this URL with a start value then I first need to load visits.php in the main div tag. Is it possible to see if this is loaded or not?
$.post("visits_results.php", $("#profile_form_id").serialize(),
function(data) {
$('#search_results').html(data);
location.href = "#visits=" + start;
});
}
else {
var args = localStorage.getItem("visits");
$('#main').load("visits.php?" + args, function () { });
}
}
My attempted work around was this:
var args = localStorage.getItem("visits");
$('#main').load("visits.php?" + args, function () {
$('#start').val(start);
$.post("visits_results.php", $("#profile_form_id").serialize(),
function(data) {
$('#search_results').html(data);
location.href = "#visits=" + start;
});
});
There must be a better way...this is realoading the same portion of the page (visits.php) with every pagination event. Is there a better way to load URLs and not have them trigger an address change?
Using paul's work around from his comments, but instead of Regex'ing html content in the visits.php form this solution will look for data() attached to #mainID.
Paul's work around notes:
After a bit more hacking I came up with this solution that seems to do
the trick. I'm not sure how good it is but it seems to do the trick. I
now get the main div id and do a regex match on a unique string in the
form. If I don't see it I load the form and then load the results. Not
sure if this is good practice or not but it seems to solve my issue.
Methodology to use .data() instead of a regex search of visits.php's html:
/*check if we're missing visits.php by looking for data() flag*/
if( !($("#main").data()["hasVisitsPhp"]) ){
var args = localStorage.getItem("visits");
$('#main').load("visits.php?" + args, function () {
$('#start').val(start);
$.post("visits_results.php", $("#profile_form_id").serialize(),
function(data) {
/* we've loaded visits.php, set the data flag on #main*/
$('#main').data("hasVisitsPhp","loaded");
$('#search_results').html(data);
location.href = "#visits=" + start;
});
});
}
try window.location.hash instead. Changing the whole href can/will trigger a whole-page reload, while changing just the hash by itself should at most cause the page to scroll.