Develop Reference

Can javascript cut out a special part from a class and use it in any other place?

The question might not be clear, but I shall clear it now. In CSS libraries they use classes such as "bg-blue", "text-red", I am especially talking about TailWind. But these classes are limited, if someone want a new color he / she has to go with CSS. So finally I stuck to an idea. Let's take an example :
HTML :
<h1 class="cbg-008eff"></h1>
/* cbg = Custom Background */
JS :
I dont know what to write here....
Actually I want JavaScript to get every classes in the html document which starts with "cbg-", therefore it should understand that a background is to be placed, and the rest part after "cbg" is the value to set. Can this be done ?
Thanks In Advance

You could split the class ID as a string by the '-' using the Javascript Split function, not sure how you could get the class ID tho but then you can get the Colour ID as Ramon said. Then use this to implement it: https://www.w3schools.com/js/js_htmldom_css.asp

javascript focus on div element using # id

hello what I want it is simply like in the image below :
I want if I add #element1 so the div which have the same id ="element1" so it will get colored somehow , I just want to know what to type on google so I can find a solution because I searched for javascript hash etc but without any success.

you need to use window.location.hash to get the hash value
so if your hash is #someId23
do something like:
if (window.location.hash){
$(window.location.hash).addClass('selected');
}

This answer will help you to focus div, then you can use 'div:focus, div:active' pseudo classes and add some animation there, there are a lot, google it
This is better than jQuery manipulation. Also page performance doesn't affected

CSS doesn't work after div id swap with js

Im trying to keep css working after swapping div id with js replace. I can't really figure it out i don't know what's wrong at all. Actually it's so simple that i don't even know what to think ...
<style>#WD4 { color:red; }</style>
<div id="60b0b9b1">qww4t</div>
<script>var x = document.body.innerHTML;x = x.replace('60b0b9b1', 'WD4');</script>
I just want color to apply. Im sure there's even more than one way around I just can't get it.
Big thanks in advance.
I actually forgot a few important things:
There are more than just one divs with 'WD4' ID
I can't edit document i can only inject my javascript code
I can't edit styles either

You can find the element by id:
document.getElementById("60b0b9b1").id = 'WD4';
FIDDLE
And your css is looking for #WD3 not #WD4

looks like you need to adjust your style to #WD4
Personally I would just add a css class to the element and not style the unique ID of the element.

Removal of link using JQuery

I am trying to do a very simple task but I cannot seem to figure it out. I am trying to write a function that will remove a link without removing the text associated with it. Here are the specifics:
Categories[/CODE]
I am trying to remove everything EXCEPT the text "Categories", I just want to remove the href tag. I would even be willing to rename the title "Categories". I just want to link gone. This link is in a div called "mw-normal-catlinks" and it is the first link in the div. I do not want to remove the other content in that div.
I am very new to jQuery and so far I have an idea of what to do. This is what I got:
<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<script type="text/javascript">
$('#mw-normal-catlinks a.first').replaceWith('Categories');
</script>
Now I am not sure if I am missing anything because when i put this in my HTML code, nothing happens. I'm not sure if I need to add a div to make it work.
I want to eventually implement this into a PHP coded tool I use to convert wiki pages to html so maybe I will need to add some sort of div?
Thanks everyone!

Use .unwrap()
$('#mw-normal-catlinks a.first').contents().unwrap();
Also you probably want this selector instead since your a tag doesn't have a class of .first:
$('#mw-normal-catlinks a:first-child').contents().unwrap();

.first means "A member of the class first", you might be confusing it with :first-child or :first-of-type

Find part of string throughout site and replace with new text

I am still having trouble understanding regex. I am also not even sure if you can target a whole page...but without knowledge of how to format regex, its getting play with it.
I have a trademarked name that appears throughout my page. I'd like to use JS to add a (r) to the end of it every time it appears.
Can jquery/js accomplish this?
$("body").each(function() {
this.innerHTML = this.innerHTML.replace(
'breathe right',
'breathe right(r)');
});
Thanks!

This is a good use case for the CSS :after pseudo-element:
CSS
.product-name:after {
content: " \00AE"; /* add restricted symbol after every element with the product-name class */
}
HTML
<span class="product-name">My Product</span>
Working Demo
The easiest way is to wrap your product name in a span and tag it with a class. I'm not sure if that's less work that just adding the symbol to your markup to begin with, though.
The benefit of this approach is it would allow you to easily apply other styles to your product name, like bolding the text or changing the font color.
You can read more about the :after pseudo-element here.

Yes, but it won't be efficient if you tell jQuery to search the entire document. To make it efficient, you'll need to have jQuery get a specific location to search if you want any efficiency in it.

You don't need jQuery :
document.body.innerHTML = document.body.innerHTML.replace(/breathe right/g, 'breathe right(r)')