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add style to div generated by html2pdf.js

html2pdf.js is a package for generating pdf's from html it is based on jspdf and html2canvas. It has a nice feature where it can insert page-breaks in order not to split elements. The way it works is that it loops over all the elements and creates empty div's where a page break needs to be inserted. I would like to style those divs and instead of having blank white space would like to be able to insert a class to determine how they would look. The issue is I don't seem to have access to this new HTML that will be converted to a pdf. The API seems to indicate that this is possible here but when I put in code like this:
var worker = html2pdf();
worker.set(opt).from(finalHtml).toContainer().toCanvas().then(newHtml => {
console.log(newHtml)
return newHtml
})
I am getting undefined. This is true whether I chain to toCanvas() and toContainer or not. Basically I would like the html generated here, how do I access this?

JavaScript DIV Editing Destroys Functionality of Other Elements

So my website is built using a company's software called Inksoft which leaves me very little to work in the way of customization. So I have to do many workarounds.
Here is my site's homepage.
The header on top of the page only has two links right now. "Products" and "Design Studio". My goal is to add an "About Us" link and "Buyers Guide" to the header as well.
I cannot add new content to the header using Inksoft's backend. So I coded a workaround to replace the content of existing DIV's within the header to say and link to where I want them to go.
The only issue is, the responsive mobile-nav loses functionality when this is implemented. As seen here on this test page.
The test page has the About Us in the top header, added by the use of this code:
<script>
$("#header-nav-designs").html('<document.write="<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
So, the simplified question is: how do I implement this code without losing the responsive functionality of the nav bar?

The jQuery .html function will replace the HTML inside the target element. If you want to just append the one value, you likely want to .append to the element.
In addition, you aren't setting the HTML to a valid html string. You probably just want to get rid of the <document.write=" at the beginning of the string. The rest of it looks fine with just a cursory glance.
So:
<script>
$("#header-nav-designs").append('<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
Edit:
After looking at it a little more, it appears as though the $('#header-nav-designs') that you are selecting is already an <li> which means you need to either select the parent <ul> list or you can use the jquery .after function instead.
<script>
$("#header-nav-designs").after('<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
And as someone else commented above, you are getting an error on the page. It appears as though you are trying to get an element with the id divID and the appending some html to it, but there is no element with the id divID and so you are getting an error saying that you can't read the property innerHTML of null as the call to document.getElementById is returning null (element not found).

Element id header-nav-designs witch your code is referring have CSS style on line 170:
#header-nav-designs {display:none;}
The element will be hidden, and the page will be displayed as if the element is not there. With display:none;
If I understand you correctly your code selector points to wrong element id. It should point $(".header-nav > ul"). Document.write is not needed inside jQuery you need to give only an valid html string as argument.
jQuery html function erase html that is all ready inside element and replace it with html string given as argument. You have to use append if you want to add more html but not remove what is allready in element.
$(".header-nav > ul").append('<li><font color="#000000">About Us</font></li>');
$(".header-nav > ul").append('<li><font color="#000000">Buyers Guide</font></li>');

Clone HTML and remove some nodes using jQuery

I'm developing a little tool for live editing using Chrome DevTools, and I have a little button "Save" which grabs the HTML and sends it to server to update the static file (.html) using Ajax. Very simple indeed.
My problem is that I need to filter the HTML code before sending it to the server, I need to remove some nodes and I'm trying to achive this using jQuery, something like this:
// I grab all the HTML code
var html = $('<div>').append($('html').clone()).html();
// Now I need to remove some nodes using jQuery
$(html).find('#some-node').remove();
// Send the filtered HTML to server
$.post('url/to/server/blahblahblah');
I already tried this Using jQuery to search a string of HTML with no success. I can't achieve to use jQuery on my cloned HTML code.
Any idea about how to do this?

The DOM is not a string of HTML. With jQuery, you do DOM manipulation, not string manipulation.
What you're doing is
cloning the document (unnecessary because you convert it to HTML anyway),
appending that cloned document to a new div for some reason
converting the content of that div to an HTML string
converting that HTML back to DOM nodes $(html) (so we're back to the first point above)
finding and removing an element in those nodes
presumably posting the html variable to the server.
Unfortunately, the html string has not changed because you manipulated DOM nodes, not the string.
Hopefully you can see above that you're doing all sorts of conversions that have little to do with what you ultimately want.
I don't know wny you'd need to do this, but all you need is to do a .clone(), then the .find().remove(), then .html()
var result = $("html").clone(false);
result.find("#some-node").remove();
var html = result.html();

Maybe like this?
var html = $('html').clone();
html.find('#some-node').remove();

Whats make different in below Jquery code?

I'm working with on developing one of the social networking site and its having some notification features in left panel.
Whenever any user have played a game it will automatically change the number of notification count.
For that i have using below code line.
jQuery('#count_id').load('mypage.php');
But it will retrieve me whole site content with header,footer and content area in the response text, which is wrong as per my requirements.
but if i used below code of line
jQuery('#count_id').load('mypage.php #count_id');
then it will retrieve me a real count but add another div in between the original,
Original html:
<div id="count_id" class="notify">2</div>
and Code after retrieving response:
<div id="count_id" class="notify">
<div id="count_id" class="notify">1</div>
</div>
which is also not as expected. count are right but i don't want to add new div inside a original one.
What should i need to change in my code?
Thanks.

jQuery('#count_id').load('mypage.php #count_id > *');
That would bring only the DOM childs (the content)

Because this is how it works. Also it enables you to attach events to the element you load and delegate them inside this element (so new elements can also benefit from attached JavaScript events) - see .delegate().
If you want to replace the element, you can try the following:
jQuery.get('mypage.php', function(data){
jQuery('#count_id').replace(jQuery(data).find('#count_id'));
}, 'html');
I did not test it, but it should work.
Ivan Castellanos is however right. According to the documentation, you can provide any selector after the first space in the .load()'s parameter.

To retrieve count_id, you can directly get the html value in the div like this:
<script type='text/javascript'>
jQuery(document).ready(function()
{
countVal = $("#count_id").html(); //returns the html content inside the div, which is the count value
countVal = parseInt(countVal); //This will convert the string to type integer
});
</script>
Note:
If you want increase the count and update the div value, you can add the following lines:
countVal++;
$("#count_id").html(countVal);

Create new (not change) stylesheets using jQuery

We've got a little tool that I built where you can edit a jQuery template in one field and JSON data in another and then hit a button to see the results immediately within the browser.
I really need to expand this though so the designer can edit a full CSS stylesheet within another field and when we render the template, it will have the CSS applied to it. The idea being that once we've got good results we can take the contents of these three fields, put them in files and use them in our project.
I found the jQuery.cssRule plugin but it looks like it's basically abandoned (all the links go nowhere and there's been no development in three years). Is there something better or is it the only game in town?
Note: We're looking for something where someone types traditional CSS stylesheet data in here and that is used immediately for rendering within the page and that can be edited and changed at will with the old rules going away and new ones used in their stead. I'm not looking for something where the designer has to learn jQuery syntax and enter in individual .css("attribute", "value") type calls to jQuery.

Sure, just append a style tag to the head:
$("head").append("<style>p { color: blue; }</style>");
See it in action here.
You can replace the text in a dynamically added style tag using something like this:
$("head").append("<style id='dynamicStylesheet'></style>");
$("#dynamicStylesheet").text(newStyleTextGoesHere);
See this in action here.

The cleanest way to achieve this is by sandboxing your user-generated content into an <iframe>. This way, changes to the CSS won't affect the editor. (For example, input { display:none; } can't break your page.)
Just render out your HTML (including the CSS in the document's <head>, and write it into the <iframe>.
Example:
<iframe id="preview" src="about:blank">
var i = $('#preview')[0];
var doc = i.contentWindow || i.contentDocument;
if (doc.document) doc = doc.document;
doc.open('text/html',true);
doc.write('<!DOCTYPE html><html>...</html>');
doc.close();

If the user should be able to edit a whole stylesheet, not only single style attributes, then you can store the entered stylesheet in a temporary file and load it into your html document using
$('head').append('<link rel="stylesheet" href="temp.css" type="text/css" />');

sounds like you want to write an interpreter for the css? if it is entered by hand in text, then using it later would be as simple as copy and pasting it into a css file.
so if you have a textarea on your page to type in css and want to apply those rules when you press the button, you could use something like this (only pseudocode, needs work):
//for each css id in the text area
$.each($('textarea[name=cssTextArea]').html().split('#'), function({
//now get each property
$.each($(this).split(';'), function(){
$(elem).css({property:value});
});
});
then you could write something to go through each element that your designer typed in, and get the current css rules for it (including those that you applied using some code like the snippet above) and create a css string from that which could then be output or saved in a db. It's a pain and much faffing around with substrings but unfortunately I don't know of a faster or more efficient way.
Hope this atleast gives you some ideas