Develop Reference

I can not call the variable

document.getElementById("quilltext").value = '[{"insert":"12312312312312312312312312\n"}]';
var x = document.getElementById("quilltext").value;
quill.setContents(x);
doesn't work, but
quill.setContents([{"insert":"12312312312312312312312312\n"}]);
works fine.

From the question, if setContents() with array input works then you can try converting the string value with JSON.parse():
quill.setContents(JSON.parse(x));

Converting Javascript hashtag

What I'm trying to do is fetch a single piece of a string without using the hashtag element in the url. I already have a functioning code but it needs altering. So, how do I fetch any part of the url after ?.
Say I have ?fx=shipment+toys/fish-fix-fx/ as my url string; I want the button to show if shipment or fish or fx was my choice of selections for example.
Buttons showing with hastag: http://jsfiddle.net/66kCf/2/show/#iphone
Original JSFiddle (buttons not showing): http://jsfiddle.net/66kCf/2/
I want the iPhone buttons to show if fix was my choice: http://jsfiddle.net/66kCf/2/show/?fx=shipment+toys/fish-fix-fx/

try doing it with .split() and.match() like this...
var keys = window.location.href.split('?');
if (keys[1].match(/(fix|fish|fx)/))
{
$("#linkdiv").append(nextLink);
$("#linkdiv1").append(nextLink);
$("#linkdiv2").append(nextLink);
}
demo button showing : http://jsfiddle.net/LbKmf/show/?fx=shipment+toys/fish-fix-fx/
demo button not showing: http://jsfiddle.net/LbKmf/show/?reigel

Is this what your looking for:
"?fx=shipment+toys/fish-fix-fx/".split(/[\?=+\/-]/g);

window.location.search and split into array for comparisons
explained in How can I get a specific parameter from location.search?
http://css-tricks.com/snippets/javascript/get-url-and-url-parts-in-javascript/

Generally, Javascript doesn't have a built-in functionality for query string parameters. You can use string manipulation on window.location.search to get your parameters out of the URL string. Note that location.search includes the ? character too.
Something like this should do:
var queryString = function () {
// Anonymous function - executed immediately
// get rid of the '?' char
var str = "?fx=shipment+toys/fish-fix-fx/";
var query = str.substring(str.lastIndexOf('=')+1,str.indexOf('/'));
var vars = query.split("+");
for (var i=0;i<vars.length;i++){
console.log(vars[i]);
}
return vars;
} ();

using javascript to replace onpage javascript

I'm fairly new to javascript so please go easy on me,
I have this code on a webpage:
<script type="text/javascript"> bb1 = "oldcode"; bb2 = "morecodehgere"; bb3 = 160000;</script>
I want to replace 1% of all page loads oldcode to newcode
There are multiple instances of this code on the same page and I want to replace them all.
window.onload = replaceScript;
function replaceScript() {
var randomNumber = Math.floor(Math.random()*101);
var toReplace = 'oldcode';
var replaceWith ='newcode';
if randomNumber == 1 {
document.body.innerHTML = document.body.innerHTML.replace(/toReplace/g, replaceWith);
}
}
This is the current code I've got but it doesn't work.
Is javascript the bast way to achieve what I'm looking to do? If so whats the best way to do this?

The regular expression literal:
/toReplace/g
will create a regular expression object that matches the string "toReplace". If you want to create a regular expression to match the (string) value of the variable toReplace, you must use the RegExp constructor:
var re = new RegExp(toReplace, 'g');
It is not a good idea to replace the innerHTML of the body with a copy of itself. The innerHTML property doesn't necessarily reflect all the nuances of the DOM and will not include things like dynamically added listeners. It also varies from browser to browser.
Using a regular expression to replace parts of innerHTML is almost certain to produce unpredictable results, it may work well on trivial pages but will not be reliable on complex pages.

Replace Word Within Word - Javascript

I need to get a id from a html element and replace a part of the word. For example:
HTML
<input type="checkbox" id="facebookCheckbox"></div>
JavaScript
var x = document.getElementById("facebookCheckbox");
var name = x.id;
name.replace("Checkbox","");
This obviously does not work because the replacing word has to be standalone for it to be replaced. Is there a different way of doing this?
I'm looking for purely javascript no jQuery
Thank you!

name.replace("Checkbox","");
This obviously does not work because the replacing word has to be standalone for it to be replaced.
No, it does work and there's no need to be "standalone" - any part of the string can be matched. Only you did nothing with the result of the operation:
console.log(name.replace("Checkbox",""));
// or
name = name.replace("Checkbox","");
// or assign back to x.id maybe?

You are creating a copy of string when replacing, so you must assign the result of .replace() back to x.id.
var x = document.getElementById("facebookCheckbox");
x.id = x.id.replace("Checkbox","");

this is not going to work in this way. However you can have a marker kind of character by which you can break the name into array and implement the logic. For example:
var x = document.getElementById("facebook_Checkbox");
//Note I have added underscore in the Id
var name = x.id;
var arr=name.split("_");
//Now you have Checkbox and Facebook as string objects (part of array) and you can use them
name=arr[0]
I hope it will solve the purpose.

Quotes in Javascript

I have been trying for hours to fix this code, I can't see what's wrong:
document.getElementById('detail'+num).innerHTML='<a class="dobpicker" href="javascript:NewCal('+s_d+','+ddmmyy+')">'
The problem is in href="javascript ..."
s_d is a javascript variable defined as
var num = 2;
var s_d = "sname"+num;
var ddmmyy = "ddmmyy";
Basically I need to call a javascript function with different parameter each time.

Use a backslash like \'.
document.getElementById('detail'+num).innerHTML=
'<a class="dobpicker" href="javascript:NewCal(\''+s_d+'\',\''+ddmmyy+'\')">'

Since this is the value of a href attribute, HTML encode them:
document.getElementById('detail'+num).innerHTML='<a class="dobpicker" href="javascript:NewCal("'+s_d+'","'+ddmmyy+'")">'
Or better yet don't use the javascript: protocol:
[0,1,2,3,4,5].forEach(function(num) {
var s_r = "sname"+num;
var ddmmyy = "ddmmyy";
var aEl = document.createElement("a");
aEl.className = "dobpicker";
aEl.onclick = function() {
NewCal(s_d, ddmmyy);
}
document.getElementById('detail'+num).appendChild(aEl);
});

Your .innerHTML setting is using s_d, but your variable declaration has s_r.
EDIT: That was the first thing that jumped out at me. Having looked a bit closer and realised the values are strings, I think fixing the variable name together with adding some escaped quotation marks as in Daniel A. White's answer will do the trick.