firefox - unable to receive event for dynamic javascript - javascript

I have some dynamic javascript that creates elements, with a click event element handler... the script is included from another domain.
However with Firefox at runtime it gives a security warning and does not process the click event (Chrome works fine).
A simplified version below
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"></head>
<body>
<h2 id="headertitle">TEST</h2>
<br/>
<script type="text/javascript" src="somewhereelse.com/script.js">
</script>
</body>
</html>
Javascript include:
document.getElementById("headertitle").insertAdjacentHTML('beforeBegin',
"<button value='TEST' onclick='clickHandler(this)' >Button</button>");
function clickHandler(evt){
alert("clicked");
}
Warning Message:
Security wrapper denied access to property undefined on privileged
Javascript object. Support for exposing privileged objects to
untrusted content via exposedProps is being gradually removed -
use WebIDL bindings or Components.utils.cloneInto instead. Note that
only the first denied property access from a given global object will
be reported.

I tried your code here and it worked fine for me on Firefox 50.1.0. =/
However, I strongly recommend you use JQuery to deal with events triggered by dynamically created elements. JQuery handles the DOM differently, it's cross-browser and it's just made for this kind of situation. It may solve your problem. =D
Try and change your html to
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"></head>
<body>
<h2 id="headertitle">TEST</h2>
<br/>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="somewhereelse.com/script.js">
</script>
</body>
</html>
and your JS code to
document.getElementById("headertitle").insertAdjacentHTML('beforeBegin',
'<button value="TEST" class="clickable" id="btn1">Button</button>');
$('.clickable').on('click', function() {
alert($(this).attr('id') + ' was clicked');
});
That should make it work!
Cheers! =)

Related

jQuery selector not working in script but works in console

this is a very odd problem indeed and I hope it's simple. I cannot get a simple select and append to work in my html document, but it works when I'm in the chrome browser console.
<html>
<head>
<script src="https://code.jquery.com/jquery-1.12.3.min.js" integrity="sha256-aaODHAgvwQW1bFOGXMeX+pC4PZIPsvn2h1sArYOhgXQ=" crossorigin="anonymous"></script>
<script src="/js/script.js"></script>
<script>
$('[data-js="works"]').append("hello");
</script>
</head>
<body>
<div data-js="works"></div>
test
</body>
</html>
When I put that line of script in the console, hello appears above test. When I just open the page, test is there alone. I was running a script from this page earlier and when I tried to select an element it didn't work. I then went to inline script to see if it would even work there, no. I've seen if it works from inline script without the imported script, also no. Console has no bug information. I can print from that inline script to my console if I want, but this code still isn't running properly.
Doesn't work with my local httpserver and doesn't work just as a locally opened file.
This is because the script is executed before the page is loaded so the target div does not exist yet.
The solution is to wait for the page to be fully loaded before doing something.
The $ function can be used for this. Give it a callback and it will be executed once the page is loaded.
You can also use window.addEventListener("load", callback); that doesn't need jQuery.
<html>
<head>
<script src="https://code.jquery.com/jquery-1.12.3.min.js" integrity="sha256-aaODHAgvwQW1bFOGXMeX+pC4PZIPsvn2h1sArYOhgXQ=" crossorigin="anonymous"></script>
<script>
$(function(){
$('[data-js=works]').append("hello");
});
</script>
</head>
<body>
<div data-js="works"></div>
test
</body>
</html>
Another solution can be to insert your script at the end of the page. It is not as neat though in my opinion.
<html>
<head>
<script src="https://code.jquery.com/jquery-1.12.3.min.js" integrity="sha256-aaODHAgvwQW1bFOGXMeX+pC4PZIPsvn2h1sArYOhgXQ=" crossorigin="anonymous"></script>
</head>
<body>
<div data-js="works"></div>
test
<script>
$('[data-js=works]').append("hello");
</script>
</body>
</html>
Try the following, hope it will solve your problem
(function($) { // This will solve namespace problem (if any)
// Write your JQuery code here
})(jQuery);
Either you put the .js file at the end of the body or put your JS code between $(document).ready(function(){ //code inside })

Javascript Not Working in HTML - In a Variety of Ways

Is it possible to load javascript without jQuery? I spent the better portion of yesterday evening simply trying to create the most basic HTML page with working CSS and Javascript and - despite the numerous methods I have tried - none of them have worked. Here is my basic HTML page:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
<link rel="stylesheet" href="style.css">
<script src="script.js" type="text/javascript"></script>
</head>
<body>
<div>On</div>
<input type="button" onclick="popup()" value="Click Me!">
</body>
</html>
This is being hosted locally on XAMPP, the page displays fine and the CSS works fine, the javascript is in the same directory as the html page and works fine when written inline with the HTML. However the js does not work in any of the following scenarios when trying to include it as an externality:
When application/javascript is used above it still doesn't work. All I receive in either case (in the Firebug script window) is "popup()" and that's it. Here is the script.js file:
function popup() {
alert("Hello World")
}
This js also doesn't work (I tried it even though I'm not parsing XML):
//<![CDATA[
function popup() {
alert("Hello World")
}
//]]>
nor this:
document.addEventListener('DOMContentReady', function popup() {
alert("Hello World")
})
nor this:
<script type="text/javascript">
function popup() {
alert("Hello World")
}
</script>
Not that I really expected it too, but I was getting desperate. If anyone knows what's going on, I'd appreciate any info.
I'm open to this being an issue with hosting this locally on XAMMP but find it doubtful as CSS and HTML are both flying. However the js works if I include it inline with the HTML(?). If it helps, when Firebug displays popup() in the script window it also shows an #conn1source connection.
UPDATE: according to one of the suggestions in the comments if I only write the following in the js file it works:
alert("Hello World")
however the function does not. So I'm guessing this means that I wrapped the function somehow incorrectly in the js file, but I'm following standard practice as far as I am aware.

Jquery toggle() and click() functions not working in internet explorer 11?

Here is my Jquery code.Please have a look through it and do help me?
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$("#rec").click(function() {
$("#tab1").toggle();
});
</script>
<input type="button" class="button" id="rec" value="Sample"/>
<div id="tab1">
Hello this is a sample jquery toggling function.
</div>
Just wrap your Jquery code inside $(document).ready(function(){}) as shown below :-
<script type="text/javascript">
$(document).ready(function(){
$("#rec").click(function(event) {
event.preventDefault();
$("#tab1").toggle();
});
});
</script>
Read More on $(document).ready() here.
Working Demo
It seems that there is an error while loading JQuery try this
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
Use $(document).ready(function(){}, to execute the js code when then document will be loaded or put your scripts just before the </body> tag.
I ll take a guess here. (I'm feeling lucky!) (update:seems i wasn't lucky but read this anyway it's usefull)
Your code does not work because you say "do something when the html element with id="rec" is clicked" and "do something to the html element with id="tab1""
My guess is, you have more than one html element with id="rec" and/or more than one html element with id="tab1" in your code.
id value of html elements must be unique across a webpage! If there are more than one html elements with the same id then the jquery selector doesn't know when to fire, and also browsers behavior can be unexpected. This may be the cause of internet explorer nagging.
You need to add compatibility meta just after <head> tag:
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge;chrome=1" />

JQuery .load() not working in Internet Explorer

I am using following code for my website:
<script src="js/jquery-1.10.1.js" type="text/javascript"></script>
<script src="js/jquery-migrate-1.2.1.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("img#logo").load(function() {
alert('Hello');
});
});
</script>
And this is not working in IE but works fine in Firefox, Chrome and Safari.
I can confirm that your code does work in IE 8 on windows 7 64 using unminified version:
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<script type="text/javascript" src="jquery-1.10.1.js"></script>
<script>
$(document).ready(function () {
console.log($.fn.jquery);
$("img#logo").load(function () {
console.log('Hello');
});
});
</script>
</head>
<body>
<img id="logo" src="somegig.gif" onload="console.log('load');"/>
</body>
</html>
This will log 1.10.1 then load and then Hello, maybe you have to validate your html and make sure your html is valid maybe that's a problem.
a quick review of http://api.jquery.com/load-event/ provides some caveats:
Caveats of the load event when used with images
A common challenge developers attempt to solve using the .load()
shortcut is to execute a function when an image (or collection of
images) have completely loaded. There are several known caveats with
this that should be noted. These are:
It doesn't work consistently nor reliably cross-browser
It doesn't fire correctly in WebKit if the image src is set to the same src as before
It doesn't correctly bubble up the DOM tree
Can cease to fire for images that already live in the browser's cache
Note the first and fourth caveats. Clear the cache and try again.
Also, do you need the jQuery migrate ? Lose it and see if it is glitching your IE

click() method in Firefox

The following code is throwing two alerts as expected in IE but not in Firefox. Please help.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function myFunction(){
alert('myfunc');
document.getElementById('mylabel').click();
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<p id='mylabel' onclick="alert('you reached');"></p>
<input type='button' value="Click me" onclick='myFunction();'/>
</BODY>
</HTML>
Firefox only has a click() function for form elements such as buttons. However, you can call the onClick function directly; you can change the line to
document.getElementById('mylabel').onclick();
This works in firefox or IE (but note that it requires that the function actually exists, which you know it does in this example).
Also note that you aren't actually simulating a click on that element (so, for example, if there were other things that such a click would do, such as also act as a click on the container, they won't happen). You're just getting the function that would run on a click, and running it directly. So it's not a solution for all situations where you need to simulate a click.
There's no click method on elements. Are you using any library?
Usually you have to do something like element.fireEvent('click') (prototype, mootools)
or element.click() (jquery)
UPDATE- Similar question: How do I programmatically click on an element in JavaScript?
Looks like an ugly and brittle solution, if I were you I'd just include jQuery and let that handle all the browser quirks.
Because the <p> tag does not have the method click.

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