JQuery function .load not working - javascript

I have the next code. What am trying to do is when i refresh or open the page, to add the class intro. But my main problem is in the part :
$("body").load(function(){
I want when the page is opened, then to add the class .intro. Instead of body, i have also tried html, and still doesn't work.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("body").load(function(){
$("p").addClass("intro");
});
});
</script>
<style>
.intro {
background-color:green;
}
</style>
</head>
<body>
<img src="https://k32.kn3.net/taringa/1/9/3/9/4/7/32/johnny_te_toco/330x330_248.gif" width="304" height="236">
<p><b>Note:</b> Depending on the browser, the load event may not trigger if the image is cached.</p>
</body>
</html>

You should not use load() for this purpose.
load() function description : Load data from the server and place the returned HTML into the matched element.
You need just ready function to achieve that :
$(document).ready(function(){
$("p").addClass("intro");
});
//OR
jQuery(function($){
$("p").addClass("intro");
});
Hope this helps.

Try this instead:
$(document).ready(function(){
$(window).load(function(){
$("p").addClass("intro");
});
});
Load event attached to the window. If that is what you meant? Load on a DOM element like that doesn't make much sense.
Whilst this should work, you could pull it out of your ready() event.
$(document).ready(function(){
// Nothing to see here...
});
$(window).load(function(){
$("p").addClass("intro");
});
This waits for the load of the window, but if you just want to add the class as soon as possible when the DOM is ready, well, you won't need the load() at all:
$(document).ready(function(){
$("p").addClass("intro");
});
Bonus: You should use on() to attach all events going forward.
$(window).on('load', function(){
$("p").addClass("intro");
});
on() is the preferred method for events in future jQuery versions, as older methods are deprecated.
All the best.

Put your code inside $(document).ready callback.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p").addClass("intro");
});
</script>
<style>
.intro {
background-color:green;
}
</style>
</head>
<body>
<img src="https://k32.kn3.net/taringa/1/9/3/9/4/7/32/johnny_te_toco/330x330_248.gif" width="304" height="236">
<p><b>Note:</b> Depending on the browser, the load event may not trigger if the image is cached.</p>
</body>
</html>

$(window).on('load', function(){
$("p").addClass("intro");
});

Related

jQuery simple button bind

I'm new to jQuery, so this should be a simple question.
As far as I understand, I can bind a method to listen to an event, such as the click of a button, using
$('#buttonID').bind('click', function (){//some code});
However, this isn't working for me, so I must be doing something wrong.
This is my simple html file:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js'></script>
<script src='http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js'></script>
<script src='test.js'></script>
</head>
<body>
<input id="SignIn" type="button" value="Sign In"></input>
</body>
</html>
Apart from loading jQuery files, it loads file test.js, which looks like this:
// JavaScript Document
$('#SignIn').bind('click', function() {alert('hi');});
Is that not enough for binding? I was hoping this would fire an alert dialog, but it doesn't, it seems the callback is not executed at all.
What is wrong here? Both files (html and js) are located in the same directory, and Google Chrome does not complain about anything in the JavaScript console, so from that end, everything should be fine.
Thanks for all help!
Wrap your code in document ready handler. It accepts a function which executes when DOM is fully loaded.
As you are using jQuery 1.3
$(document).ready(function() {
$('#SignIn').bind('click', function() {
alert('hi');
});
});
For jQuery 1.7+,
$(document).ready(function() {
$('#SignIn').on('click', function() {
alert('hi');
});
});
Additionally, As of jQuery 1.7, the .on() method is the preferred method for attaching event handlers to a document.
$(function(){
$('#SignIn').bind('click', function() {alert('hi');});
})
Try
$(function(){
$('#SignIn').click(function() {alert('hi');});
});
Move your Javascript to the bottom of the HTML page, right above the closing body tag.
That way the DOM is ready when it is loaded, and there's no need for $(document).ready() calls.
https://developer.yahoo.com/performance/rules.html#js_bottom
You may want to include your JavaScript files at the very bottom, and everything should work as expected. It is recommended to do this and to include CSS files at the top (head tag). For more information see link included by #Grim...
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<input id="SignIn" type="button" value="Sign In"></input>
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js'></script>
<script src='http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js'></script>
<script src='test.js'></script>
</body>
</html>
$( "#target" ).click(function() {
//Write some code here
});
You can try this.
$(document).ready(function(){
$('#SignIn').on('click', function() {alert('hi');});
});
You can use this.
$(document).ready(function () {
$("#SignIn").click(function () {
alert('demo');
});
});

jQuery preventDefault() issue

My problem is that there is no way to make preventDefault() work.
Here is my code:
HTML:
<a class="list-ui-controlcol-link list-ui-controlcol-link-delete" href="http://localhost/lmvc_trunk/pages/delete/17">Törlés</a>
JQUERY:
$(".list-ui-controlcol-link-delete").click(function(event){
event.preventDefault();
});
Even if I copy-paste the original example from jQuery's own site (http://api.jquery.com/event.preventdefault/) it is not working.
Could you explain me why this happening and how to make preventDefault work correctly?
You need to make sure that your script is executed after the DOM is loaded:
$(document).ready(function() {
$(".list-ui-controlcol-link-delete").click(function(event){
event.preventDefault();
});
});
See this page for more details: http://api.jquery.com/ready/
Where do you include your script? If you include the script in HEAD when the script loads there's no a.list-ui-controlcol-link-delete is present in the DOM.
Try doing this:
<html>
<head>
<title>test</title>
</head>
<body>
Torles
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script src="app.js"></script>
</body>
</html>
Where app.js contains:
$('.list-ui-controlcol-link-delete').click(function(e) { e.preventDefault(); });
Although I'd recommend using the .on() function as it will dinamically bind the events on newly generated DOM elements:
$(document).on('click','.list-ui-controlcol-link-delete',function(e) { e.preventDefault(); });

jQuery just not working

For some reason my jQuery script just doesn't want to work, and it's really really simple, I've taken everything away except the actual jquery script, it's really annoying please help.
Thank you!
<!doctype html>
<html>
<head>
<script src="jquery.js"></script>
<script>
$("#click").click(function () {
alert("works!");
});
</script>
</head>
<body>
Button
</body>
</html>
P.S. jQuery JS file is valid.
Change your code to this. It ensures that the JavaScript is executed once all your HTML elements have been loaded to the page:
$(document).ready(function () {
$("#click").click(function() {
alert("works!");
});
});
However, you should move your script tags to the bottom of the page, to ensure that they do not block. This will also mean you don't actually need the $(document).ready callback.
You need to wrap your code within
$(function(){
// your code here which relies on DOM elements
});
Otherwise you DOM has not been loaded and events will not be bound to elements.
Wrap your functions into the $(document).ready()
$(document).ready(function(){
$("#click").click(function() {
alert("works!");
});
});
Add your code inside document.ready like this
$(document).ready(function () {
$("#click").click(function () {
alert("works!");
});
});
or add your code at the end of the document like this
<body>
Button
// Other elements...
<script type="text/javascript">
$("#click").click(function () {
alert("works!");
});
</script>
</body>
$(document).ready(function(e) {
//TO DO your code goes here
});
Just change your script tag to the "/body" tag.
That will let the browser create the DOM and read script's one by one!
Cheers!
Try this:
$("#click").live("click",function() {
alert("works!");
});

Custom Jquery Not Available At Runtime With Dynamicallly Added Html

I have a page that looks like this..
<!DOCTYPE html>
<html>
<head>
<title>JQM</title>
<meta charset=utf-8 />
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://code.jquery.com/mobile/latest/jquery.mobile.css">
<script src="http://code.jquery.com/jquery-1.8.1.min.js"></script>
<script src="http://code.jquery.com/mobile/latest/jquery.mobile.js"></script>
<script>
$(function(){
$('[data-role="list-divider"]').toggle(function(){
$('.'+$(this).attr('data-link')).addClass('show');
$(this).children().removeClass('ui-icon-plus').addClass('ui-icon-minus');
},function(){
$('.'+$(this).attr('data-link')).removeClass('show');
$(this).children().removeClass('ui-icon-minus').addClass('ui-icon-plus');
});
});
</script>
</head>
<body>
<div data-role="page">
<div data-role="header">
</div>
<div data-role="content">
</div>
</div>
</body>
</html>
I am adding html in dymanically from the server in the content area. The problem is that when I add the content dynamically, the jquery function that I created statically on the page doesnt engage..
<script>
$(function(){
$('[data-role="list-divider"]').toggle(function(){
$('.'+$(this).attr('data-link')).addClass('show');
$(this).children().removeClass('ui-icon-plus').addClass('ui-icon-minus');
},function(){
$('.'+$(this).attr('data-link')).removeClass('show');
$(this).children().removeClass('ui-icon-minus').addClass('ui-icon-plus');
});
});
</script>
If I add the html statically all the code works fine and everything is good. My question is how do I make this jquery available to run once html is added to the page from the server?
I DID THIS AND IT WORKED, is there a more elegant way using .on or is this fine?
//got html blob
deferred.success(function (res) {
$(function () {
$('[data-role="list-divider"]').toggle(function () {
$('.' + $(this).attr('data-link')).addClass('show');
$(this).children().removeClass('ui-icon-plus').addClass('ui-icon-minus');
}, function () {
$('.' + $(this).attr('data-link')).removeClass('show');
$(this).children().removeClass('ui-icon-minus').addClass('ui-icon-plus');
});
});
});
Since the jquery is currently ran when the document is ready and your content is not loaded yet it won't find the elements and wire-up the events. Adding your script to the ajax.success should solve your problem.
looking at your code, I don't see where you're loading the content dynamically. But if you want that script to run. You should try a document.ready() in front of that script
You can't bind event handlers to elements that haven't been created. Check out this:
http://api.jquery.com/on/
Try this:
$(function(){
$(document).on('toggle', '[data-role="list-divider"]', function(){
$('.'+$(this).attr('data-link')).addClass('show');
$(this).children().removeClass('ui-icon-plus').addClass('ui-icon-minus');
},function(){
$('.'+$(this).attr('data-link')).removeClass('show');
$(this).children().removeClass('ui-icon-minus').addClass('ui-icon-plus');
});
});
Haven't tested it though. For on('click') this usually works.
What you do is you bind the 'toggle' trigger to the whole document ( $(document) ) and then check on what element is was triggered. This way you can detect elements that were created after the initialization of the DOM.
You have to use jquery .On() method to attach even handlers to contents dynamically added to pages. Check this - .on
Some thing lik this might work (didn't test) :-
$(function(){
$('[data-role="list-divider"]').on('toggle' ,function(event){
$('.'+$(this).attr('data-link')).addClass('show');
$(this).children().removeClass('ui-icon-plus').addClass('ui-icon-minus');
},function(event){
$('.'+$(this).attr('data-link')).removeClass('show');
$(this).children().removeClass('ui-icon-minus').addClass('ui-icon-plus');
});
});

Show javascript alert and do other actions?

Here's my code and nothing is happening:
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-git.js"></script>
<script>
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
</script>
</head>
<body>
<div class="clickMe">Click Me!</div>
</body>
</html>
However, nothing happens when you click the "clickMe" div.
Thanks!
Let the document be ready
$(function(){
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
})
The way you had it, the div is not yet available (the DOM is not loaded) so, no click handler is added. You need to wait for document to be available. The .ready() is to be used for that.
$(document).ready(function() {...})
$(function() {...}) - Shortcut
Try wrapping the jQuery code inside this:
$(document).ready(function() {
// Handler for .ready() called.
});
When you execute the existing code in the head, the clickMe div does not exist.
Try this:
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
});
</script>
</head>
<body>
<div class="clickMe">Click Me!</div>
</body>
</html>
You by comparing the differences you will find out the solution. Basically is this line: $(document).ready(function(){});
The DOM is not loaded yet when your JavaScript code is executed. You have to add the code to the .ready() callback. Then the code is executed when the browser parsed the HTML and jQuery can find the elements:
$(function() {
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
});
$(function(){..}); is shorthand for $(document).ready(function(){...}).
DEMO
The script is running before the .clickMe element even exists. Wrap your code in a dom ready callback:
$(function() {
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
});
Another solution would be moving your script below the element definition but using the dom ready event is much cleaner.
The issue is that you are attaching the event handler before the element is rendered to the DOM. Try this instead:
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-git.js"></script>
<script>
$(document).ready(function() {
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
});
</script>
</head>
<body>
<div class="clickMe">Click Me!</div>
</body>
</html>
The code passed into the $(document).ready function will be executed once the page is entirely loaded - so you can safely attach events to yet-to-be-created elements.
http://api.jquery.com/ready/
You're asking jquery to find your clickMe div before it exists. It's down lower on the page and the browser has not loaded it yet. A simple fix is to set up your click handler during the document ready event:
<script>
$(document).ready(function() {
$(".clickMe").click(function() {
alert('hi!');
// Do other stuff
});
});
</script>

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