$(document).ready function will not fire - javascript

I'm attempting to create a very simple HTML document with an even less complex $(document).ready() function. However.... nothing in the function will fire. I've set alerts and breakpoints (in Chrome's debugger) and nothing works. Below is the markup.
<!DOCTYPE HTML>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.0.min.js" />
<script>
alert('outside');
$(document).ready(function() {
alert('here');
});
</script>
</head>
Neither alerts work. Not sure what I'm doing wrong here.

change <script src="http://code.jquery.com/jquery-1.11.0.min.js" /> to
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>

<script>
alert('outside');
$(document).ready(function() {
alert('here');
});
</script>
you forgot to close the arches. and the closing tag of script.

Related

body onload does not see js function on the same page

I am slightly baffled by this one... for some reason the newLoaded() function is apparently not defined and as per the console output I get this: Uncaught ReferenceError: newLoaded is not defined at onload yet it's literally on the same page (not even loaded via external resources)
<head>
...
<script language="text/javascript">
function newLoaded() {
loaded();
}
</script>
</head>
<body onLoad="newLoaded();" class="page page-id-105 page-template page-template-page-fullwidth page-template-page-fullwidth-php cherry-fixed-layout" style="height: 100%;margin:0px;padding:0px">
...
What i found out was the language="text/javascript" is deprecated. Either remove it or use type=""
I have tried following code and seems to be working good
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function newLoaded() {
//loaded();
alert();
}
</script>
</head>
<body onload="newLoaded()">
</body>
</html>
also if there is any load() function whats not defined, the rest can't be triggered.
I think you might have a typo it should be onload not onLoad
EDIT: it works on both cases but the standard one all lowercase

alert is executing before html loads

Hello my questions is about how a webpage is loaded! Here is my code:
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
</head>
<body>
<h1>Waiting</h1>
<script type="text/javascript">
alert("Why?");
</script>
</body>
</html>
I cannot for the life of me figure out why the alert is running before the heading is displayed. It is my understanding that since the alert is right above the closing body tag it will be the last thing run. Why is the page waiting for me to close out the alert before displaying the heading?
Thanks for the help!
Edit: I ran this code in firefox rather than chrome and it worked how I wanted it to - the heading displayed first before the alert ran.
You need to execute your script after the page loads with
<body onload="script();">
An external script will execute before the page loads.
<body onload="script();">
<h1>Waiting</h1>
<script type="text/javascript">
function script() {alert("Why?");}
</script>
</body>
You can use setTimeout() to show the alert after a few seconds (when the page should have loaded).
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
</head>
<body>
<h1>Waiting</h1>
<script type="text/javascript">
setTimeout(function(){
alert("Why?");
}, 1000);//wait 1000 milliseconds
</script>
</body>
</html>
You can check if the header (the h1 tag) is there and only alert if it is there.
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
</head>
<body>
<h1 id="header">Waiting</h1>
<script type="text/javascript">
var x;
x = setInterval(function(){
if(document.getElementById("header")){
alert("Why?");
clearInterval(x);
}
}, 100);
</script>
</body>
</html>
The simplest workaround code without using JQuery I could write is this. Please check it.
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
</head>
<body>
<h1>Waiting</h1>
<script type="text/javascript">
window.onload = function(){
setTimeout(()=>{
alert("Why?");
},10)
}
</script>
</body>
</html>
The cleanest way to do this seems like it would be to put your javascript in a separate file, and load it with the defer attribute. This will cause it to fire after the DOM loads (technically, just before DOMContentLoaded, but it doesn't work consistently across browsers unless there is a src attribute, which is why you would need to move it to an external file.
<script src="myScript.js" defer></script>
Oddly, adding some CSS to your heading could also affect this since JS is supposed to execute in order after any pending CSS.
The timeout function or a $(document).ready() function will do what you need in theory, but a timeout could need to be adjusted based on the complexity of the page, and if you aren't already using jQuery, you probably won't want to add it just to use $(document).ready().

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 click function doesnt work

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

JQUERY won't work on local machine

I'm trying JQUERY on my machine, but for some reason, nothing seems to work. Here's the test file:
<html>
<head>
<script type="text/css" src="jquery.js">
</script>
<script type="text/javascript">
$("p").mouseover(function () {
$(this).css("color","black");
});
$(document).ready(function(){
$("body").css("background-color","black");
$("body").css("color","white");
});
</script>
</head>
<body>
<h1>This is a test</h1>
<p>Roll over me!</p>
</body>
</html>
Nothing in there works. Also, if anybody wants to know, accessing through my domain and through the local both don't work. I'm really confused, because I copied most of that code off the internet, just in case there was something wrong with my typing.
For some reason, firefox is throwing this error:
Code: Evaluate
$ is not defined
http://hussain.mooo.com/jq.html
Line: 6
$ is not defined
http://hussain.mooo.com/jq.html
Line: 6
New code (moved the p onmouseover handeler)
<script src="jquery.js" type="text/css">
</script>
<script type="text/javascript">
$(document).ready(function(){
$("p").mouseover(function () {
$(this).css("color","black");
});
$("body").css("background-color","black");
$("body").css("color","white");
});
</script>
Specify correct type for javascript file:
<script type="text/javascript" src="jquery.js"></script>
Update
You're currently using type="text/css" as content type for javascript file which is incorrect. Try to copy above code into your script.
Screenshot
removed dead ImageShack link
Install firebug and see what it tells you in the Console tab.
You should move the attachment of the mouseover handler into $(document).ready(...) because the paragraph won't necessarily exist until the document is ready and so no handler can be attached to it.
Download the latest version of jQuery "jquery-1.3.2.min.js" and link the file correctly. and try this,
<script type="text/javascript">
$(function(){
$("p").mouseover(function () {
$(this).css("color","black");
});
$("body").css("background-color","black");
$("body").css("color","white");
});
</script>

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