I want to use $.post function of jquery to do a div refresh, only if the content returned in the json data from the php script is modified. I know that ajax calls with $.post are never cached. Please help me with $.post, or $.ajax if it is not possible with $.postor any other method with which this is possible.
Thanks
Why don't you cache the response of the call?
var cacheData;
$.post({.....
success: function(data){
if (data !== cacheData){
//data has changed (or it's the first call), save new cache data and update div
cacheData = data;
$('#yourdiv').html(data);
}else{
//do nothing, data hasan't changed
This is just an example, you should adapt it to suit your needs (and the structure of data returned)
var result;
$.post({
url: 'post.php'
data: {new:'data'}
success: function(r){
if (result && result != r){
//changed
}
result = r;
}
});
Your question isn't exactly clear, but how about something like this...
<script type="text/javascript">
$(document).ready(function(){
$("#refresh").click(function(){
info = "";
$.getJSON('<URL TO JSON SOURCE>', function(data){
if(info!=data){
info = data;
$("#content").html(data);
}
});
});
});
</script>
<div id="content"></div>
<input id="refresh" type="submit" value="Refresh" />
I think you should use .getJSON() like I used it there, it's compact, and offers all the functionality you need.
var div = $('my_div_selector');
function refreshDiv(data){
// refresh the div and populate it with some data passed as arg
div.data('content',data);
// do whatever you want here
}
function shouldRefreshDiv(callback){
// determines if the data from the php script is modified
// and executes a callback function if it is changed
$.post('my_php_script',function(data){
if(data != div.data('content'))
callback(data);
});
}
then you can call shouldRefreshDiv(refreshDiv) on an interval or you can attach it to an event-handler
Related
What i want to do is, to show a message based on certain condition.
So, i will read the database after a given time continuously, and accordingly, show the message to the user.
But i want the message, to be updated only on a part of the page(lets say a DIV).
Any help would be appreciated !
Thanks !
This is possible using setInterval() and jQuery.load()
The below example will refresh a div with ID result with the content of another file every 5 seconds:
setInterval(function(){
$('#result').load('test.html');
}, 5000);
You need a ajax solution if you want to load data from your database and show it on your currently loaded page without page loading.
<script type="text/javascript" language="javascript" src=" JQUERY LIBRARY FILE PATH"></script>
<script type="text/javascript" language="javascript">
var init;
$(document).ready(function(){
init = window.setInterval('call()',5000);// 5000 is milisecond
});
function call(){
$.ajax({
url:'your server file name',
type:'post',
dataType:'html',
success:function(msg){
$('div#xyz').html(msg);// #xyz id of your div in which you want place result
},
error:function(){
alert('Error in loading...');
}
});
}
</script>
You can use setInterval if you want to make the request for content periodically and update the contents of your DIV with the AJAX response e.g.
setInterval(makeRequestAndPopulateDiv, "5000"); // 5 seconds
The setInterval() method will continue calling the function until clearInterval() is called.
If you are using a JS library you can update the DIV very easily e.g. in Prototype you can use replace on your div e.g.
$('yourDiv').replace('your new content');
I'm not suggesting that my method is the best, but what I generally do to deal with dynamic stuff that needs access to the database is the following method :
1- A server-side script that gets a message according to a given context, let's call it "contextmsg.php".
<?php
$ctx = intval($_POST["ctx"]);
$msg = getMessageFromDatabase($ctx); // get the message according to $ctx number
echo $msg;
?>
2- in your client-side page, with jquery :
var DIV_ID = "div-message";
var INTERVAL_IN_SECONDS = 5;
setInterval(function() {
updateMessage(currentContext)
}, INTERVAL_IN_SECONDS*1000);
function updateMessage(ctx) {
_e(DIV_ID).innerHTML = getMessage(ctx);
}
function getMessage(ctx) {
var msg = null;
$.ajax({
type: "post",
url: "contextmsg.php",
data: {
"ctx": ctx
},
success: function(data) {
msg = data.responseText;
},
dataType: "json"
});
return msg;
}
function _e(id) {
return document.getElementById(id);
}
Hope this helps :)
<form>
<input type="text" id="user"/>
<input type="button" value="Submit" onClick="post();" />
</form>
<div id="result"> </div>
<script type="text/javascript">
function post()
{
var username = $('#user').val();
$.post('battlephp.php',
{postuser:user}
)
}
</script>
Its a simple Ajax code.. It should take username and display the Php code!
But don't know why its not running?? Actually I am learning...so I cant rectify the error or fault??
I am running ii on localhost.. so is there any problem with using:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
display the Php code
No, it shouldn't.
First, you've changed your mind about the variable name you are using (user, username) half way through your script, so you are going to throw a reference error.
Second, you haven't provided a function (the third argument) to $.post, so you aren't doing anything (such as displaying it) with the returned data.
Third, the server should execute the PHP and return its output. You shouldn't get the actual PHP code.
function post() {
var username = $('#user').val();
$.post(
'battlephp.php',
{postuser:username}, // Be consistent about your variable names
function (data) {
alert(data);
}
);
}
Instead
document.ready()
you can use
jQuery(function($){...});
Try to do this:
<script>
$(document).ready(function() {
function post() {
var username = $('#user').val();
$.ajax({
type : 'post',
url : 'batttlephp.php',
data : {
postuser : user
},
success : function(data) {
alert(data);
},
error : function(data) {
alert(data);
}
});
});
});
</script>
if you're doing a ajax request then is good also handle success and error...
Also I suggest to you "to start the document".
Try the code above and let us know if worked
I have an application that I'm writing that, in one aspect of it, you click on a checkmark to complete a task, a popup window is displayed (using bootstrap), you enter your hours, and then that is sent to a PHP page to update the database. I'm using FF (firebug) to view the post. It's coming up red but not giving me an error. The only thing I'm doing is echoing out "sup" on the PHP page, and it's still showing errors, and I can't figure out why.
This is my initial click function:
$('.complete').on('click', function(event) {
var id = $(this).attr('data-id');
var tr = $(this).parent().parent();
var span = $(tr).children('td.task-name');
var r = (confirm('Are you sure you want to complete this task?'));
if (r){
addHours(id);
} else {
return false;
} // end else
});
That works fine, and it fires my next function which actually fires the bootstrap modal:
function addHours(id) {
var url = 'load/hours.php?id='+id;
$.get(url, function(data) {
$('<div class="modal hide fade in" id="completeTask">' + data + '</div>').modal()
.on('shown', function() {
pendingTask(id);
}); // end callback
}).success(function() {
$('input:text:visible:first').focus();
});
} // end function
This is also working, and the modal is displayed just fine. However, whenever I post the form to my logic page, it fails for no reason. This is the function to post the form to the logic page:
function pendingTask(id) {
$('.addHours').on('click', function(event) {
var formData = $('form#CompleteTask').serializeObject();
$.ajax({
url:'logic/complete-with-hours.php',
type: 'POST',
dataType: 'json',
data: formData,
success: function(data) {
if (data.status == 'error') {
$(this).attr('checked', false);
//location.reload();
} // end if
else {
$(this).attr('checked', true);
//location.reload();
} // end else
},
dataType: 'json'
});
}); // end click
} // end function
When this is fired, I see this in my Firebug console:
I know this is a lot of information, but I wanted to provide as much information as I could. Every other post function in the application is working fine. It's just this one. Any help would be appreciated.
Thanks in advance.
The jQuery.ajax data parameter takes a simple object of key value pairs. The problem could be that the object created by serializeObject() is too complex. If that's the case, you could either process the formData object to simplify it or try data: JSON.stringify(formData)
Does serializeObject() even exist in jQuery? is that a function you wrote yourself? Can you use jQuery functions like serialize() or serializeArray() to serialize the form data and see how it goes.
Usually the red indicates a 404 response error. We can't tell in this screen shot. Check your php code by directly calling the requested page and getting a proper response.
Also make sure your dataType is application/json which is the proper mime type header (though I don't think this is causing the error). You also should only have dataType once (you have it again at the bottom)
I figured it out. I changed the post type from the structure I entered above to a standard post:
$("#CompleteTask").validate({
submitHandler: function(form) {
var hours = $('#hours').val();
$.post('logic/complete-with-hours.php', {'hours': hours, 'id':id},
function(data){
if (data.status == 'success') {
$(checkmark).attr('checked', false);
$('.message').html(data.message).addClass('success').show();
} // end if
if (data.status == 'error') {
$('.message').html(data.message).addClass('error').show();
} // end else
},
"json"
); //end POST
} // end submit handler
}); // end validate
That seemed to do the trick
I am trying to pass two variables (below) to a php/MySQL "update $table SET...." without refreshing the page.
I want the div on click to pass the following variables
$read=0;
$user=$userNumber;
the div Basically shows a message has been read so should then change color.
What is the best way to do this please?
here's some code to post to a page using jquery and handle the json response. You'll have to create a PHP page that will receive the post request and return whatever you want it to do.
$(document).ready(function () {
$.post("/yourpath/page.php", { read: "value1", user: $userNumber}, function (data) {
if (data.success) {
//do something with the returned json
} else {
//do something if return is not successful
} //if
}, "json"); //post
});
create a php/jsp/.net page that takes two arguments
mywebsite.com/ajax.php?user=XXX&secondParam=ZZZZ
attache onClick event to DIV
$.get("ajax.php?user=XXX&secondParam=ZZZZ". function(data){
// here you can process your response and change DIV color if the request succeed
});
I'm not sure I understand.
See $.load();
Make a new php file with the update code, then just return a json saying if it worked or not. You can make it with the $.getJSON jQuery function.
To select an element from the DOM based on it's ID in jQuery, just do this:
$("#TheIdOfYourElement")
or in your case
$("#messageMenuUnread")
now, to listen for when it's been clicked,
$("#messageMenuUnread").click(function(){
//DO SOMETHING
}
Now, for the AJAX fun. You can read the documentation at http://api.jquery.com/category/ajax/ for more technical details, but this is what it boils down to
$("#TheIdOfYourImage").click(function(){
$.ajax({
type: "POST", // If you want to send information to the PHP file your calling, do you want it to be POST or GET. Just get rid of this if your not sending data to the file
url: "some.php", // The location of the PHP file your calling
data: "name=John&location=Boston", // The information your passing in the variable1=value1&variable2=value2 pattern
success: function(result){ alert(result) } // When you get the information, what to do with it. In this case, an alert
});
}
As for the color changing, you can change the CSS using the.css() method
$("#TheIdOfAnotherElement").css("background-color","red")
use jQuery.ajax()
your code would look like
<!DOCTYPE html>
<head>
</head>
<body>
<!-- your button -->
<div id="messageMenuUnread"></div>
<!-- place to display result -->
<div id="frame1" style="display:block;"></div>
<!-- load jquery -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
//attach a function to messageMenuUnread div
$('#messageMenuUnread').click (messageMenuUnread);
//the messageMenuUnread function
function messageMenuUnread() {
$.ajax({
type: "POST",
//change the URL to what you need
url: "some.php",
data: { read: "0", user: "$userNumber" }
}).done(function( msg ) {
//output the response to frame1
$("#frame1").html("Done!<br/>" + msg);
});
}
}
</script>
</body>
Why doesn't the following pick up the form? All it does is just to do a normal PHP post without throwing any errors...
I'm using blockUi on this as well, hence block/unblock.
$(document).ready(function(){
$("input.update").click(function(){
var str = $(this).parent().serialize();
$(this).parent().parent().block({ message: "<span class=\"loading\"><img src=\"<?php echo $siteUrl ?>/admin/template/images/loading.gif\" alt=\"loading...\" /><p>Updating...</p></span>" });
$.ajax({
type: "POST",
url: "forms/update.php",
data: str,
success: function(){
$("div.edit_box").unblock();
$("div.edit_box").append("<span class=\"success\">This has been updated!</span>");
}
});
return false;
});
});
This is my first attempt at using jQuery's Ajax functionality so please bear with me.
("input.update").click(function(){
should be
$("input.update").click(function(){
Since it seems you're only using the 'success' callback of post you could use the .post method, which is a bit easier on the eyes. Also you can put those block calls inside ajaxStart and ajaxStop. To me it's neater.
The $(this).parent().parent().block seemed wrong to me, I changed it to reference the same element that is used for unblocking. I'd also be checking the output of the PHP script, to make sure that whatever you are 'updating' actually is updated (just echo XML from PHP and you'll see it on your console log).
$(function() {
// Apply click handlers to anchors
$("input.update").click(function(e){
// Stop normal link click
e.preventDefault();
var str = $(this).parent().serialize();
// Send request
var action = "forms/update.php";
$.post(action, {data:str}, function(xml) {
console.log(xml);
$("div.edit_box").append("<span class=\"success\">This has been updated!</span>");
})
});
// Adds a wait indicator to any Ajax requests
$(document.body).ajaxStart(function() {
$("div.edit_box").block({ message: "<span class=\"loading\"><img src=\"<?php echo $siteUrl ?>/admin/template/images/loading.gif\" alt=\"loading...\" /><p>Updating...</p></span>" });
}).ajaxStop(function() {
$("div.edit_box").unblock();
$("div.edit_box").append("<span class=\"success\">This has been updated!</span>");
});
});