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JavaScript button fires perfectly in Chrome and IE but won't work in Firefox

I'm sure the title looks like something that's been asked before but I've searched for the answer to this and I can't find it.
I'm really very new to coding, so please excuse any really obvious mistakes I've made.
Context to the code I'm working on: I'm in a Game Design class and I've decided to take up a personal project making an HTML JS game.
I understand that the code is possibly rough / bad / definitely-not-the-best-way-to-do-things, but it will continue to be so until I improve my skills (or am given advice on how to improve it).
What I need help with: For two to three weeks, I could not figure out how to get a button to appear when implemented inside of an if else statement.
Like so:
if(condition)
{
document.write("text");
//desired button here
}
else
{
//Backup code
}
Eventually I figured two ways to do that (for Chrome and Internet Explorer).
First way:
function myFunction()
{
document.close();
document.write("text");
/* There will be buttons in here
too when I get things working. */
}
//In separate script tags
/* myFunction() dwells in the head of the
page while the if statement is in the body
and another function*/
if(condition)
{
document.write("text");
var gameElement=document.createElement("BUTTON");
var text=document.createTextNode("CLICK ME");
gameElement.appendChild(text);
gameElement.onclick = myFunction;
document.body.appendChild(gameElement);
}
else
{
//Backup code
}
The second way:
(The same function, they're both in the same places).
if(condition)
{
document.write("text");
var gameElement;
gameElement = document.createElement('input');
gameElement.id = 'gameButton';
gameElement.type = 'button';
gameElement.value='Continue';
gameElement.onclick = myFunction;
document.body.appendChild(gameElement);
}
This works well for me.
And while it works in IE and Chrome fine, it doesn't work in Firefox.
After how much time and research I've put into just this button, I'd love to know why it won't show up in Firefox. I've read a lot about Firefox and how .onclick won't work or something like JavaScript has to be enabled or disabled. I'm just a bit confused.
I'm also open any real / relevant advice.

I set up this fiddle. I removed your document.write() calls because they're disallowed in JSFiddle, and change your condition to true so the code would work, and it works in FF24.
document.write() might be the cause of your problem. It's bad practice anyway because it can cause a re-parse of a document, or wipe the entire document and start writing it again. You're already using some DOM manipulation to add the button. I suggest you do likewise for anything you're considering using document.write() for.

Instead of suggesting a solution to your problem, I would suggest you take a look at jQuery, which is a very nice JavaScript framework, that makes it possible for you to write cross-browser compatible code, which it seems is your problem here.
Using jQuery, you would be able to write something like:
$("#gameButton").click(function() { myFunction(); }
which would trigger your myFunction() function, when the control with the id 'gameButton' is clicked.
Visit www.jquery.com to learn more

Problems with option selection in Chrome and Opera

I've Problems with thise Code, it's working fine in Firefox and Internet Explorer but it doesn't work with Opera and Chrome Browsers...
<script>
function planetselect()
{
optionen=document.getElementById('pstart').options;
for(i=0;i<optionen.length;i++)
{
if(optionen[i].value==67080)
{
optionen[i].setAttribute('selected','selected');
}
}
optionen=document.getElementById('pdest').options;
for(i=0;i<optionen.length;i++)
{
if(optionen[i].value==67080)
{
optionen[i].setAttribute('selected','selected');
}
}
}</script>

Change
optionen[i].setAttribute('selected','selected');
to
optionen[i].selected = true;
More generally, avoid the use of setAttribute to change DOM properties. Sometimes it works, sometimes it doesn't.
From the MDN :
Using setAttribute() to modify certain attributes, most notably value
in XUL, works inconsistently, as the attribute specifies the default
value. To access or modify the current values, you should use the
properties. For example, use elt.value instead of
elt.setAttribute('value', val).

Did you make sure you close the <script> tag? I can't really see a problem with your code that you posted, so either you didn't close your tag, or your optionen or options variables aren't there or valid
Also too, you should know that chrome has a javascript console that should show you any errors you have. To open it, it's ctrl-shift-j. That should help you a lot.

TinyMCE on IE8: text cursor problem

when i type something on ie 8, and press 'bold' on toolbar on top of the text editor, the cursor will go to the beginning of the entire text editor. is this bug in tiny mce?
on the other hand, if i select text i typed, and pressed control+b, no problem ; both are fine in firefox,ie6

Have you tried turning off "View->Caret Browsing" in IE8 ? (it is toggled by F7)
That worked for me

I had a similar problem where the image that I wanted to insert was always going to the top of the editor. I solved it by setting the 'onchange_callback' field in the editor's init:
tinyMCE.init({..., onchange_callback: 'updateSelectionBookmark', ...});
This will call my 'updateSelectionBookmark' function when anything is changed on the screen, including the editor being blurred (Read more: http://tinymce.moxiecode.com/wiki.php/Configuration:onchange_callback). My updateSelectionBookmark looked something like:
function updateSelectionBookmark (ed) {
ed.updatedSelectionBookmark = ed.selection.getBookmark(1);
}
This will add a custom property to the editor object which will always contain the latest bookmark.
I then make use of the stored bookmark whenever I need to add the content:
ed.selection.moveToBookmark(ed.updatedSelectionBookmark);
I wanted to insert HTML so I put this before my call to the instance command (In my case, mceInsertRawHTML).
I hope this helps someone, even if my answer is a few months late.
Edit (A few months later): So I originally found this solution while working with TinyMCE 3.2.2.3 but we recently updated to 3.4.4 for compatibility with IE9. Looks like the above solution doesn't work as well as I thought it did. I've since found a (as far as I can tell) perfect solution to this. It's similar to the above except when and where to trigger the callback. Instead of using onchange_callback in the settings, you should use the editor's onEvent event:
tinyMCE.init({
...,
setup: function (ed) {
ed.onEvent.add(function (ed, e) {
ed.updatedSelectionBookmark = ed.selection.getBookmark(1);
});
},
...
});
This replaces the need for the updateSelectionBookmark function or the onchange_callback setting. The reason onEvent works better than onChange is because it gets called after any possible event, including mouse or key presses so the cursor's position is guaranteed to be saved even if moved but the content isn't changed.
After setting up the editor with the above event callback, just use moveToBookmark as stated above to restore the selection. I've tested this on IE9, Chrome, FF6, it works when inserting images/text inside text/tables.

I would'nt say that it's a bug in IE8.
A cursor does'nt move by magic, someone(tinymce) put's him somewhere.
So if the cursor does'nt appear at the expected position, it has to be a misbehaviour in tinymce.
But I can't provide a "bugfix", because this not occurs with my IE8(Win7).
What's your environment?

Using Prettify on dynamically-generated code

I'm using Prettify for syntax highlighting, but it doesn't work on dynamically generated code.
I have a form that when submitted generates code and displays it (without refreshing) in <div id="output></div>, but prettify doesn't work on this code, is there any workaround?
Many thanks!

Make sure you recall Prettify once the new code is loaded.
You will need to add a handler to the 'Submit' event. I don't know if you are using a framework or raw JS, so I can't give a code example.

There's a nice solution at http://www.codingthewheel.com/archives/syntax-highlighting-stackoverflow-google-prettify.
In short:
listen for an event: user is inactive for X seconds (after key press)
run the Prettify function prettyPrint()
(if a user starts typing before X seconds do not run Prettify)
.
$(document).ready(function() {
$('#mytextarea').keydown(function() {
$(this).stopTime();
$(this).oneTime(1000, function() {
/* launch the Prettify here */
});
});
});
code copied from http://www.codingthewheel.com/archives/syntax-highlighting-stackoverflow-google-prettify

Click event not worked in Firefox

I am using a jquery click function:
Button code
<input type="button" id="myButtton">
Jquery code
$(document).ready(function () {
$("#myButtton").click(function () {
alert("Mybutton");
});
});
This code works in Internet Explorer but does not work in Firefox.
What am I doing wrong?

In the code:
$(document).ready(function(){
$("#myButtton").click(function(){
alert("Mybutton");
});
I believe it's missing another closing brace:
$(document).ready(function(){
$("#myButtton").click(function(){
alert("Mybutton");
});
});

My best guess is that you have other input with the same ID? Try using classes instead, or use jQuery's CSS selector like $('input[type=button]') instead.
I'd also recommend installing FireBug plugin for FireFox if you haven't done so already (http://www.getfirebug.com/). It'll help you debug JavaScript issues like this, and a whole lot more.

Are you sure that element has an id attribute? Or does it have only a name attribute with a value of "myButton". In order to work cross browser the id attribute is mandatory, whereas name is optional (only IE and Opera AFAIK).
N.B.: My answer may seem idiot, but it was not the original poster that added the code example in the question (view edit history).