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Limit lines of contenteditable div with taggle.js

I'm trying to create div, that looks like multiline input and is able to insert tags using taggle.js library. Now I'm struggle with limiting max lines of tags (not characters).
<div id="divinput" tabIndex="1" class="custom mcustom textarea" contentEditable>
</div>
Very simple demo looks like this:
https://jsfiddle.net/t9sabcy3/1/
Forgive me for putting taggle.css into css section below my scripts (I separated them with long /* ------------------- */ comment), can't append to head this file.
I prepared demo to stop after fullfiling first line.
Problem shows in 3 cases.
First one is simply writing all the time and accepting tags -> although it should stop at first line, the next line shows up.
2nd and 3rd case are connected, if the last tag is very long (in 2nd case less than width of #divinput, in 3rd larger), tag appears in the 2nd line (and in the 3rd case even the 3rd line shows up).
I'm unable to use input (because tags are not working there) and I've tried some options, like preventDefault (as in the demo), setting to nowrap(doesn't work), triggering backspace keydown event (keydown doesn't catch that at all) and now I'm running out of ideas.
Any help is appreciated

My ID's have been changed, how can i stop it?

I've been trying to do something simple, i think, let me explain:
I have an BPMS software where a send an e-mail at the end of the process, this e-mail is an HTML page that i created, inside the HTML page we have some identifying codes that get a field value from an previously form, some strings. The problem is, when i transfer that value to the HTML page, obviously the "Enter" key doesn't work like the "br" tag, so i made a simple javascript to replace the "enter" for the "br". It worked, but when i send the e-mail my ID is changed and they put an "x_" prefix, so there goes my question.
Can i stop it or there is some other way to do it?
The code is below:
<p id="informacoes">
TEST
TEST
</p>
<script>
var strMessege = document.getElementById('informacoes');
strMessege.innerHTML = strMessege.innerHTML.replace(/(?:\r\n|\r|\n)/g, '<br />');
</script>

It seems like your end goal here is to retain original line breaks present in the source code. I think your best bet would be to address this using CSS.
Take a look at the CSS property white-space, MDN: white-space property
By default, CSS collapses white space (e.g. multiple non-breaking ("regular") spaces, tabs, and newlines) into, effectively, a single regular space. In your example, the line breaks that you see in the source code are being collapsed and so they will not be rendered by the browser or email client.
Try using CSS to set a different white-space property, like
#informacoes {
white-space: pre-line;
/* depending on your use case,
a different value might work better */
}
Property values other than white-space: normal (which is the default) will change whether and how white space, including new lines, are collapsed when rendering from the source code to the screen.

Preserving Newlines When Using ".text" or ".textContent". Possible? Alternatives? Workarounds?

If I grab some html from one element, then attempt to assign it as the text content of another element, newlines are not preserved (at least not in the latest Firefox and Chromium).
So, for example, the follow code (with sensible html) produces output where the newlines are replaced by spaces. Well, except the alert, which works as expected.
$("#info").data("html", $("#info").html());
$("#jquery").text($("#info").data("html"));
document.getElementById("javascript").textContent = $("#info").data("html");
$("#alert").click(function() { alert($("#info").data("html")) });
Here's a running example: http://jsfiddle.net/76S7z/2/
There should be some method of setting the html of one element as the text of another while preserving newlines properly.
Is this possible with "text" or "textContent"? Is there an alternative way to do this? Is there a simple workaround? A less than simple workaround?

As you've already determined, Web browsers don't normally render newline characters \n as line breaks. If you're resistent to adding the line break element <br />, you can use the white-space CSS property with the value pre-line, which will:
Sequences of whitespace are collapsed. Lines are broken at newline characters, at <br>, and as necessary to fill line boxes.
Be sure to check the property's compatibility tables before using.
<div style="white-space: pre-line;">
Look
at
these line breaks!
</div>
Here's a JSFiddle example.

Preserving white space in an HTML select option

I have a set of html text boxes that take input and when the user clicks an 'add' button uses javascript to take the text input and format a string that is put in an HTML select box. The first of these boxes is supposed to contain a 2 character number but can also accept a blank. The formatted strings would look like this:
01-ABC-O
02-DEF-I
However I need a way to display the blank numbers that lines up with the other elements
-GHI-O
This type of entry will show up fine when the javascript adds the option, but when the page is reloaded and the select is repopulated with the values (I'm using Java, jsp, and struts 1.1 if that helps) it gets the same values(spaces preserved) but the whitespace is no longer shown in the select control (I've looked at the page source, and it looks identical to when the javascript adds the option). I have tried substituting the spaces for but this just prints the string "&nbsp" instead of the space. I've also tried using "pre" html blocks and the css white-space property and neither have worked.
Let me know if any further clarification is needed.

You need to replace the spaces with and it should work - note the closing semi-colon (which is missing from your example in the question)! When you do it through Javascript, most (all?) browsers will automatically render the spaces, but when the spaces are there when the page is loaded all (sometimes all but one) of them will be ignored.
You should also apply a font-family: CSS attribute to the select that specifies mono-spaced font(s) in order to ensure everything lines up properly.

When creating the select option with javascript, to preserve white-space, use "\xa0" - it is a NO-BREAK SPACE char.

You can use the pre css style on the area that you are outputting the value to.
<style type="text/css">
#element {
white-space: pre;
}
</style>
<div id="element">
stuff goes here
</div>
This will preserve all whitespace in the div element (other element types will also work) and then you don't need to worry about using the non breaking space.

Are you going to add it via scripting, you need to use Escape Codes for Space "% A0" which you then decode with unescape ()
logTypeList[i] = new Option(unescape(" kent Agent".replace(/ /g, "%A0")), "theValue");

logTypeList[i] = new Option(unescape(" kent Agent".replace(/ /g, "%A0")), "theValue");
Since unescape is deprecated, you may want to use decodeURI:
logTypeList[i] = new Option(decodeURI(" kent Agent".replace(/ /g, "%C2%A0")), "theValue");
More info at http://www.javascripter.net/faq/mathsymbols.htm

You can use the Unicode Character 'SPACE' (U+0020) instead of ("\u0020")

Displaying <textarea> value as HTML

I have a form with several textarea elements. User enters data and submits the form. On the next page it shows submitted text as static text - in p tags. Obviously New Line and multiple paces get ignored and everything just shows in one line.
I can do some preprocessing like replacing New line characters with "br/" and spaces with . but I was wondering if there is a standard solution to that either on server side (C#) or client side (javascript)

Since the data is preformatted (and this isn't just a matter of presentation), the pre element would be suitable (you will still need to replace <, & and friends with the appropriate entities).

Apply CSS white-space: pre; on the <p> element. This way any whitespace inside the element will be preserved.

Actually, I ended up replacing new line symbol with [br/] and it works very well.