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Why is innerHTML truncating my string (and how do I fix it)?

I have two simple strings I want to output (both coming from user input). The console.log says that they are properly received by JavaScript into their respective variables, but when I output them via innerHTLM, the first is truncated at the "<" symbol.
JavaScript
var content1 = "Dog- Happy<Hungry", content2 = "Dog- Happy<2Hungry"
console.log(content1,content2)
document.getElementById("output").innerHTML = content1 + "<br>" + content2
Output
Dog- HappyDog- Happy<2Hungry
Expected Output
Dog- Happy<Hungry
Dog- Happy<2Hungry
The input is from users and I want them to be able to use the "<" symbol, as it is a common symbol for this type of input. I am guessing that the "<" is being seen as the beginning of an HTML tag, though I am not sure. How do I solve this, so that they can use the "<" symbol?
Here is a JSFiddle if it is helpful: https://jsfiddle.net/m79dca3p/
Encode html entities in javascript does not help as those responding are split on the best solution, thus it is still an open debate and not a solution.

< is how you start a tag in HTML, and since you use innerHTML the input is treated as HTML.
If you want input to be treated as plain text, use a mechanism that deals in text and not one that deals in HTML.
const content1 = "Dog- Happy<Hungry";
const content2 = "Dog- Happy<2Hungry";
const output = document.getElementById("output");
output.append(document.createTextNode(content1));
output.append(document.createElement('br'));
output.append(document.createTextNode(content2));
<div id=output></div>

Just use innerText instead of innerHTML and add your <br>separateley

how to force jquery attr() to add the attribute with single quotes

I create an in memory div:
var video_div = document.createElement('div');
video_div.className = "vidinfo-inline";
In essence I have some variables:
var key = "data-video-srcs";
var value = '{"video1":"http://www.youtube.com/watch?v=KdxEAt91D7k&list=TLhaPoOja-0f4","video2":"http://www.youtube.com/watch?v=dVlaZfLlWQc&list=TLalXwg9bTOmo"}';
And I use jquery to add that data attribute to the div:
$(video_div).attr(key, value);
Here is my problem. After doing that I get this:
<div class="vidinfo-inline" data-video-srcs="{"video1":"http://www.youtube.com/watch?v=KdxEAt91D7k&list=TLhaPoOja-0f4","video2":"http://www.youtube.com/watch?v=dVlaZfLlWQc&list=TLalXwg9bTOmo"}"></div>
And that doesn't work putting that json in there. It has to be in single quotes. It has to look like this:
<div class="vidinfo-inline" data-video-srcs='{"video1":"http://www.youtube.com/watch?v=KdxEAt91D7k&list=TLhaPoOja-0f4","video2":"http://www.youtube.com/watch?v=dVlaZfLlWQc&list=TLalXwg9bTOmo"}'></div>
As later on I do something like this:
var video_srcs = $('.vidinfo-inline').data('video-srcs');
And that won't work unless the json is in single quotes.
Does anyone have any ideas?
EDIT:
According to jquery: http://api.jquery.com/data/#data-html5
When the data attribute is an object (starts with '{') or array (starts with '[') then jQuery.parseJSON is used to parse the string; it must follow valid JSON syntax including quoted property names. If the value isn't parseable as a JavaScript value, it is left as a string.
Thus I can't escape the double quotes, it has to be inside single quotes. I have a work around and I'll post that as an answer unless someone else has a better answer.

I have a workaround. And if anyone has a better solution, I'd love to see it.
I wrote a replace method:
var fixJson = function(str) {
return String(str)
.replace(/"{/g, "'{")
.replace(/}"/g, "}'");
};
So basically I send the html into this function and insert it into the DOM.
For example:
var html = htmlUnescape($('#temp_container').html());
html = fixJson(html);
I realize that has some code smell to it. I mean, going through everything on that element just to fix the double quotes to single quotes stinks. But for lack of other options or ideas, it works. :\

Replace the double quotes with HTML entities:
var value = '{"video1":"http://www.youtube.com/watch?v=KdxEAt91D7k&list=TLhaPoOja-0f4","video2":"http://www.youtube.com/watch?v=dVlaZfLlWQc&list=TLalXwg9bTOmo"}';
# Naive approach:
value = value.replace('&', '&').replace('"', '"');
# Using jQuery:
var $tmp = jQuery('<div></div>');
value = $tmp.text(value).html();
// Then store it as normal

jQuery: howto add a <br/> line break in different strings to separate sentences in 2?

I have different sentences which all have double quotes in them, like:
<h3 class="myClass">Sentence one "ends like this"</h3>
<h3 class="myClass">Sentence two"ends like that"</h3>
<h3 class="myClass">Sentence three "another ending"</h3>
All on a page. Basically all values are differents, and I'm trying to have a line break just before the double quote so it would be like
<h3 class="myClass">Sentence one <br/>"ends like this"</h3>
<h3 class="myClass">Sentence two <br/>"ends like that"</h3>
<h3 class="myClass">Sentence three <br/>"another ending"</h3>
I'm kind of confused on which jQuery function should be used to be honest, between split, text ? Any help would be appreciated , I need to understand how to do this... Many thanks!

You can match the <h3> elements, then pass a function to html(). That function will be called for each element, will be passed the current element's inner HTML markup, and must return the new markup.
From there, you can use replace() to insert a <br /> element before the first double quote character:
$("h3.myClass").html(function(index, currentHtml) {
return currentHtml.replace('"', '<br />"');
});
You can test this solution in this fiddle.

Make a function that takes a jQuery object, gets its html, and changes it
function addBR($el) {
Get the element's html
var originalhtml = $el.html();
Split the html by the quotation mark, and join them with a new <br />
var newhtml = originalhtml.split('"').join('<br />"');
Apply the new html
$el.html(newhtml);
And that's it.
Call it with
addBR(jQuery element);
Example: http://jsfiddle.net/XFC5u/

I would take a look at the Javascript split() method but in essence you have the right idea. You want to split based on the double quote(\") and that will return you an array of all the splits where a double quote occurs.
So something like this would happen:
var array = $(".myClass").text().split("\"");
//array = [Sentence one, ends like this, ];
(Not 100% sure if code is right so someone please check ><)
and then from there you can kind of recreate the text with the included . At least that's the process of how I would go about it.
Also just remember that the split method does remove the \" from the array (because it uses it as a limiter to split them) so make sure to readd them when you are recreating the text.
As for if Jquery as a specific way of doing this, I'm not sure. If anyone would like to improve my answer, feel free.

Take a look here to see this code working:
$(".myClass").each(function() {
var text = $(this).text();
var q = text.indexOf('"');
$(this).html(text.substr(0, q) + "<br />" + text.substr(q));
});

just with some basic javascript (inside a jQuery loop offcourse)
​$(".myClass").each(function() { // for each item of myClass
var text = $(this).text(); // temp store the content
var pos = text.indexOf('"'); // find the position of the "
$(this).html(text.slice(0,pos) + '</br>' + text.slice(pos)); // slice before + <br> + slice after = new content
});​​​​​​​​​​
fiddle:
http://jsfiddle.net/JaPdT/

$('.myClass').each(function(){
if($(this).text().indexOf('"') >=0 ){
$(this).text( $(this).text().replace('"', '<br/>"') )
}
})

Is there a way to convert HTML into normal text without actually write it to a selector with Jquery?

I understand so far that in Jquery, with html() function, we can convert HTML into text, for example,
$("#myDiv").html(result);
converts "result" (which is the html code) into normal text and display it in myDiv.
Now, my question is, is there a way I can simply convert the html and put it into a variable?
for example:
var temp;
temp = html(result);
something like this, of course this does not work, but how can I put the converted into a variable without write it to the screen? Since I'm checking the converted in a loop, thought it's quite and waste of resource if keep writing it to the screen for every single loop.
Edit:
Sorry for the confusion, for example, if result is " <p>abc</p> " then $(#mydiv).html(result) makes mydiv display "abc", which "converts" html into normal text by removing the <p> tags. So how can I put "abc" into a variable without doing something like var temp=$(#mydiv).text()?

Here is no-jQuery solution:
function htmlToText(html) {
var temp = document.createElement('div');
temp.innerHTML = html;
return temp.textContent; // Or return temp.innerText if you need to return only visible text. It's slower.
}
Works great in IE ≥9.

No, the html method doesn't turn HTML code into text, it turns HTML code into DOM elements. The browser will parse the HTML code and create elements from it.
You don't have to put the HTML code into the page to have it parsed into elements, you can do that in an independent element:
var d = $('<div>').html(result);
Now you have a jQuery object that contains a div element that has the elements from the parsed HTML code as children. Or:
var d = $(result);
Now you have a jQuery object that contains the elements from the parsed HTML code.

You could simply strip all HTML tags:
var text = html.replace(/(<([^>]+)>)/g, "");

Why not use .text()
$("#myDiv").html($(result).text());

you can try:
var tmp = $("<div>").attr("style","display:none");
var html_text = tmp.html(result).text();
tmp.remove();
But the way with modifying string with regular expression is simpler, because it doesn't use DOM traversal.
You may replace html to text string with regexp like in answer of user Crozin.
P.S.
Also you may like the way when <br> is replacing with newline-symbols:
var text = html.replace(/<\s*br[^>]?>/,'\n')
.replace(/(<([^>]+)>)/g, "");

var temp = $(your_selector).html();
the variable temp is a string containing the HTML

$("#myDiv").html(result); is not formatting text into html code. You can use .html() to do a couple of things.
if you say $("#myDiv").html(); where you are not passing in parameters to the `html()' function then you are "GETTING" the html that is currently in that div element.
so you could say,
var whatsInThisDiv = $("#myDiv").html();
console.log(whatsInThisDiv); //will print whatever is nested inside of <div id="myDiv"></div>
if you pass in a parameter with your .html() call you will be setting the html to what is stored inside the variable or string you pass. For instance
var htmlToReplaceCurrent = '<div id="childOfmyDiv">Hi! Im a child.</div>';
$("#myDiv").html(htmlToReplaceCurrent);
That will leave your dom looking like this...
<div id="myDiv">
<div id="childOfmyDiv">Hi! Im a child.</div>
</div>

Easiest, safe solution - use Dom Parser
For more advanced usage - I suggest you try Dompurify
It's cross-browser (and supports Node js). only 19kb gziped
Here is a fiddle I've created that converts HTML to text
const dirty = "Hello <script>in script<\/script> <b>world</b><p> Many other <br/>tags are stripped</p>";
const config = { ALLOWED_TAGS: [''], KEEP_CONTENT: true, USE_PROFILES: { html: true } };
// Clean HTML string and write into the div
const clean = DOMPurify.sanitize(dirty, config);
document.getElementById('sanitized').innerText = clean;
Input: Hello <script>in script<\/script> <b>world</b><p> Many other <br/>tags are stripped</p>
Output: Hello world Many other tags are stripped

Using the dom has several disadvantages. The one not mentioned in the other answers: Media will be loaded, causing network traffic.
I recommend using a regular expression to remove the tags after replacing certain tags like br, p, ol, ul, and headers into \n newlines.

Why is my .data() function returning [ instead of the first value of my array?

I want to pass an array into a jQuery data attribute on the server side and then retrieve it like so:
var stuff = $('div').data('stuff');
alert(stuff[0]);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<div data-stuff="['a','b','c']"></div>
Why does this appear to alert '[' and not 'a' (see JSFiddle link)
JSFiddle Link: http://jsfiddle.net/ktw4v/3/

It's treating your variable as a string, the zeroth element of which is [.
This is happening because your string is not valid JSON, which should use double-quotes as a string delimiter instead of single quotes. You'll then have to use single-quotes to delimit the entire attribute value.
If you fix your quotation marks your original code works (see http://jsfiddle.net/ktw4v/12/)
<div data-stuff='["a","b","c"]'> </div>
var stuff = $('div').data('stuff');
When jQuery sees valid JSON in a data attribute it will automatically unpack it for you.

Declaring it as an attribute means that it is a string.
So stuff[0] would be equivalent to: var myString = "['a','b','c']"; alert(myString[0]);
You need to make it look like this:
<div data-stuff="a,b,c"></div>
var stuff = $('div').data('stuff').split(',');
alert(stuff[0]);
Retraction: jQuery's parsing fails because it didn't meet the rules of parseJSON.
However, I will stand behind my solution. There are aspects of the others that are less than ideal, just as this solution is less than ideal in some ways. All depends on what your paradigms are.

As others have identified the value is treated as string so it is returning "[". Please try this (aaa is the name of the div and I took out the data-stuff):
$(function(){
$.data($("#aaa")[0],"stuff",{"aa":['a','b','c']});
var stuff = $.data($("#aaa")[0],"stuff").aa;
alert(stuff[0]); //returns "a"
});

A different approach is posted at jsfiddle; var stuff = $('div').data('stuff'); stuff is a string with 0th character as '['
Well, var stuff = eval($('div').data('stuff')); should get you an array