I am new to javascript, and I have tried to debug as much as I can but I still cannot figure why I cannot get the alert "Event 1" to show up when I click on text:
<!DOCTYPE html>
<html>
<head>
<title>Title</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<script type="text/javascript" language="javascript">
$("#id").bind("click", function() {
alert("Event 1");
});
</script>
<body>
<div class="foo" id="id">Click</div>
</body>
</html>
The problem is that you need to ensure that you only bind to the element once the page has loaded, and the element is therefore accessible. This can be done by wrapping your existing jQuery in a $(document).ready(), as can be seen in the following working example.
Also, note that .bind() has been deprecated as of jQuery 3.0, and you should use .on() instead. Note that the elements that you target with .on must exist at the time that you make the call to them:
Event handlers are bound only to the currently selected elements; they must exist at the time your code makes the call to .on()
If your target element is not visible in the DOM on page load, you can use event delegation to bind to an element that is visible on page load, and then delegate that functionality to the target.
<!DOCTYPE html>
<html>
<head>
<title>Title</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<script type="text/javascript" language="javascript">
$(document).ready(function() {
$("#id").on("click", function() {
alert("Event 1");
});
});
</script>
<body>
<div class="foo" id="id">Click</div>
</body>
</html>
Hope this helps! :)
Related
Below is my code, why isn't it working when I click on Appended text ?
1: click on This is a paragraph.
2: click on Appended text
3: Must show Appended item with color red.
$(document).ready(function(){
$(".ali").click(function(){
$(this).parent().append("<b class='reza'>Appended text</b>");
});
$(".reza").click(function(){
$(this).append("<li style='color:red'>Appended item</li>");
});
});
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<p><span class="ali"> This is a paragraph. </span> </p>
</body>
</html>
Since the element with class "reza" is not created yet, you need to define click event on future element with "reze" class. Check the below working code.
$(document).ready(function(){
$(".ali").click(function(){
$(this).parent().append("<b class='reza'>Appended text</b>");
});
$("body").on("click",".reza",function(){
$(this).append("<li style='color:red'>Appended item</li>");
});
});
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<p><span class="ali"> This is a paragraph. </span> </p>
</body>
</html>
Elements which are dynamically added to the document, can not be issued event listeners by normal means.
This is how you would normally add an event listener in jQuery.
$(element).on('click', function() {
// do something
});
The reason the example above won't work with a dynamically added element is due to the fact that the element doesn't exist when the script gets compiled.
So why does this work?
$(parent).on('click', 'element' function() {
// do something
});
This works because when the file gets compiled, the parent already exists. If you have a reference to the parent, then you can retrieve the children at anytime. Since the DOM is modular.
This question, in one way or another, has already been asked multiple times. Here's the preferred answer.
Event binding on dynamically created elements?
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");
});
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');
});
});
I have this line of code but it throws an error. What is the problem with the code?
<html>
<head>
<script src="http://prototypejs.org/javascripts/prototype.js" type="text/javascript"></script>
<script type="text/javascript">
Event.observe('target', 'click', function(event) {
// ...
});
</script>
</head>
<body>
<p id='target'>Click me!</p>
</body>
</html>
Load the script after your tag is loaded. This way you dont need to detect the dom:loaded event. :)
<html>
<head>
<script src="http://prototypejs.org/javascripts/prototype.js" type="text/javascript"></script>
</head>
<body>
<p id='target'>Click me!</p>
<script type="text/javascript">
Event.observe('target', 'click', function(event) {
alert('clicked me');
});
</script>
</body>
</html>
The element you are trying to bind the event handler to does not exist in the DOM at the time your code is executed. Wrap it in a DOM ready event handler:
document.observe("dom:loaded", function() {
Event.observe('target', 'click', function(event) {
// ...
});
});
This is mentioned in the Prototype docs:
One of the most common errors trying to observe events is trying to do
it before the element exists in the DOM. Don't try to observe elements
until after the dom:loaded event or window load event has been fired.
I am working to use IE Dom interface to automate IE page access. I am trying to get all event handlers defined in a page. I am using IHTMLElement object now for this purpose. If the html page defines "onclick=xxx", element.onclick returns the click handler. However, if an event handler is defined in javascript, element.onclick simply returns NULL. What's the right way to get the event handler then?
Thanks,
xin
Below is an example that uses javascript to define event handler.
<!doctype html>
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript"> </script>
</head>
<body>
<script>
$(document).ready(function(){
$("a").click(function(event){
$(this).hide("slow");
alert("Thanks for visiting!");
window.location="http://cnn.com";
});
});
</script>
<a>jQuery</a>
</body>
</html>
This is not possible.