So I have a very simple code with form and one button
with jQuery I want to bind some actions when user clicks on that button, but some reason it's not working
Here is the code
<!DOCTYPE html>
<html>
<head>
<script src="jquery.js"></script>
</head>
<body>
<script>
$('#jallerysubmit').bind('click', function() {
alert('asd');
})
</script>
<form>
<input type="checkbox" name="box1">box1<br>
<input type="checkbox" name="box1">box2<br>
<input type="button" id="jallerysubmit" value="Proved">
</form>
</body>
</html>
please suggest what's wrong with this code as it does not work, even it does not produce any error
You need to wrap it in a document ready handler.
<script>
$(function() {
$('#jallerysubmit').bind('click', function() {
alert('asd');
});
});
</script>
Docs: http://api.jquery.com/ready/
The JavaScript code will be executed before the DOM is loaded, so the element with ID jallerysubmit cannot be found (it does not exists yet).
#sje397 described a very common way (at least when using jQuery) how to solve this. Another way is to put the script at the end of the document:
<html>
<head>
<script src="jquery.js"></script>
</head>
<body>
<form>
<input type="checkbox" name="box1">box1<br>
<input type="checkbox" name="box1">box2<br>
<input type="button" id="jallerysubmit" value="Proved">
</form>
<script>
$('#jallerysubmit').bind('click', function() {
alert('asd');
});
</script>
</body>
</html>
Your code attaching the handler is being executed before the element exists in the DOM, therefore the selector returns nothing and the handler is not applied. Put the code inside a document ready handler and it should work. You could also simplify by using the click shortcut.
<script>
$(function() {
$('#jallerysubmit').click(function() {
alert('asd');
});
});
</script>
Include an alert("hello"); right after to make sure the jQuery is working right. Then add a return false to the end of your submit handle to make sure your page doesnt reload when the button is clicked, also use document.ready. See code below
<!DOCTYPE html>
<html>
<head>
<script src="jquery.js"></script>
</head>
<body>
<script>
$(document).ready(function(){
alert("hello");
$('#jallerysubmit').bind('click', function() {
alert('asd');
return false;
});
});
</script>
<form>
<input type="checkbox" name="box1">box1<br>
<input type="checkbox" name="box1">box2<br>
<input type="button" id="jallerysubmit" value="Proved">
</form>
</body>
</html>
Best practice is using an external .js file, example script.js:
$(document).ready(function() {
yourFunction();
});
function yourFunction() {
$('#jallerysubmit').click(function() {
alert('asd');
});
}
and import it in your html file in the tag head:
<script type="text/javascript" src="script.js"></script>
Always use jquery function within
(document).ready(function(){//ur jquery codes});
or
$().ready(function(){//ur jquery codes});
or
$.noConflict();
jQuery(document).ready(function($){//ur codes});
Once DOM of page is loaded above ready function is initiated. so i recommend jquery lovers to write their magic codes always within this code
Related
I'm having one of those moments were I can't get a simple piece of code to work. Despite spending just over an hour on this, I can't get this piece of code to work;
<!DOCTYPE html>
<html lang="en">
<head>
<title><?php echo 'Test'; ?></title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css"><!-- jQuery stylesheet -->
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script><!-- jQuery libary -->
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script><!-- jQuery UI -->
</head>
<body>
<script>
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
</script>
<form>
<input id="target" type="text" value="Field 1">
<input type="text" value="Field 2">
</form>
</body>
</html>
I've run my code through a HTML 5 validator to ensure it wasn't something stupid and I've ensured I'm using the latest version of jQuery. The strange thing is, I can make the code work on jsFiddle.
$(function(){
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
});
You need to update your script to the like written above. That is add a wrapper.
You are binding an event using jquery. However, it is not necessary that when your script executes, jquery has been loaded by then, hence, the binding does not happen, hence, the function does not get triggered.
You need to add a wrapper of on ready of jquery, which make sures that all the binding of events and script execution is done once the dom is ready.
Here, I have created a plunker for you with working version - http://plnkr.co/edit/Xhur8f1ur194ii6XlRby?p=preview
Add it in a ready function
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("input").blur(function(){
alert("This input field has lost its focus.");
});
});
</script>
</head>
<body>
Enter your name: <input type="text">
<p>Write something in the input field, and then click outside the field to lose focus (blur).</p>
</body>
</html>
put the function in document.ready
<script>
$(document).ready(function(){
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
});
</script>
or put script tag of end of the body
Please wrap your js code into
$(function(){
// your code
});
it will be
<script>
$(function(){
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
});
</script>
Here is the reference https://api.jquery.com/ready/
Your JavaScript is running before the input elements are rendered, so there's nothing to attach the event to. Either move your script to the end of the page or wrap it in $(function(){...}). Doing the latter makes the script wait for the DOMReady event fired by the browser before executing.
Option 1:
<body>
<form>
<input id="target" type="text" value="Field 1">
<input type="text" value="Field 2">
</form>
<script>
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
</script>
</body>
Option 2:
<body>
<script>
$(function(){
$("#target").blur(function () {
alert("Handler for .blur() called.");
});
});
</script>
<form>
<input id="target" type="text" value="Field 1">
<input type="text" value="Field 2">
</form>
</body>
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 am new in Javascript and I am trying to test following code
<html>
<head>
<script src="jquery/jquery.min.js">
</head>
<body>
<input type="button" value="Click button">
<script type="text/javascript">
$(function(){
$('input')[0].on('click',function(){
alert('button clicked');
});
});
</script>
</body>
</html>
but when i open this html file in browser the button doesn't display
Script tags require a closing tag, which you've omitted:
<script src="jquery/jquery.min.js"></script>
^ close
By leaving it open, the browser is treating everything after the script tag as the script content.
Also your $('input')[0] isn't right. That is getting the DOM element of the input, which has no jQuery wrapper and no .on() function. If you are trying to match just the first input then:
$('input').first().on('click',function(){
Problems
Script block must be closed which you missed.
Use $('input') instead of $('input')[0], When you use $('input')[0] you get DOM element which doesn't have click method.
Use
<html>
<head>
<script src="jquery/jquery.min.js"></script>
</head>
<body>
<input type="button" value="Click button">
<script type="text/javascript">
$(function(){
$('input').on('click',function(){
alert('button clicked');
});
});
</script>
</body>
</html>
To avoid these kind of confusions, try to separate like below,
In HTML:
<html>
<head>
<script src="jquery/jquery.min.js"></script>
<script src="main.js"></script>
</head>
<body>
<input type="button" value="Click button">
</body>
</html>
In main.js
$(function(){
$('input').on('click',function(){
alert('button clicked');
});
});
For Demo
Adding the <!DOCTYPE html> is better when you continue developing.
The following code should pop up an alert box whenever I select a file or make a change to the textbox and click out of it.
I believe the code SHOULD work, but it doesn't. Isolating the code snippets on JSFiddle and running them even works.
Is anything wrong with my code? If not, could something on my computer be preventing this code from working?
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$(document).ready(function() {
document.getElementById("file").onchange(function() {
alert($(this).val());
});
$('#text').change(function() {
alert($(this).val());
});
});
</script>
</head>
<body>
<input id="file" type="file" name="file" />
<input id="text" type="text" name="text" />
</body>
</html>
Try wrapping your function in
$(document).ready(function() {
});
jsfiddle does this for you (I think)
Alternatively use:
$(window).ready(function() {
});
if you want to ensure that the entire page has loaded before trying to run your code.
Further reading:
http://docs.jquery.com/Tutorials:Introducing_$(document).ready()
I have a simple page for testing with only a button, I am linking to an external js file. It is displaying the jquery version in a alert box, but when the button is clicked nothing happens. What is wrong with this?
Here is my simple test html page
<title>Insert title here</title>
<!-- scripts -->
<script language="JavaScript" type="text/javascript" src="jquery.js"></script>
<script language="JavaScript" type="text/javascript" src="myscript.js"></script>
</head>
<body>
<form>
<input type="button" tabindex="5" value="jscript" id="testbutton" />
</form>
</body>
and here is my myscript file content
alert($.fn.jquery);
$('#testbutton').click(function(){
alert("test successful");
});
I am using JQuery version 1.6
Probably because the DOM is not ready for JavaScript processing at the time of bindiing the click handler. Try:
$(document).ready(function() {
$('#testbutton').click(function(){
alert("test successful");
});
});
You need a document.ready:
$(document).ready(function(){
alert($.fn.jquery);
$('#testbutton').click(function(){
alert("test successful");
});
});
That's because your #testbutton can't be referenced until it's loaded
Hope this helps. Cheers