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JavaScript: How to replace code within element without innerHTML

I want to replace content within element in JavaScript but I cannot use innerHTML and jQuery.
For example:
<div id="MyID">
<b>Hi,</b> how are you?<br/>
I am fine.
</div>
I want to replace everything between <div id="MyID"> and </div>.
Like via innerHTML which I sadly cannot use:
document.getElementById('MyID').innerHTML = document.getElementById('MyID').innerHTML.replace(/you/, 'you');
Which will be:
<div id="MyID">
<b>Hi,</b> how are you?<br/>
I am fine.
</div>
How to do it?
I tried things like appendChild and removeChild but I still cannot figure it out.

For appendChild, you should append a dom entity

Use remove() to clear the existing content and then insertAdjacentHTML() to enter the new content. Here is your code sample as an example.
<div id="MyID">
<span id="MyID2">
<b>Hi,</b> how are you?<br/>
I am fine.
</span>
</div>
<button onclick="myFunction()">Insert a paragraph</button>
<script>
function myFunction() {
var a = document.getElementById("MyID2");
a.remove();
var b = document.getElementById("MyID");
b.insertAdjacentHTML('afterbegin', '<b>Hi,</b> how are you?<br/>I am fine.');
}
</script>

How to replace a link text using JavaScript

I have an HTML code and I want to replace something by JavaScript.
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>
Now I want to change "Old Text" to another like "New Text".
Please let me know if it is possible.

You have to locate your element element inside the DOM , it would be better to use class or/and id propreties.
But in case if you are not allowed to edit the DOM you have to find a way to find the required element like crossing parents that do have an id or a class.
Get first element with this class childdiv.
Get first a tag inside the above found element .
Set innerHTML for the found element to the required value exp: New Text.
Javascript (as you asked for)
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>
<script>
document.getElementsByClassName("childdiv")[0].getElementsByTagName('a')[0].innerHTML="New Text";
</script>
Jquery (same logic as above)
$(document).ready(function(){
$(".childdiv a").text("New Text");
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>

You simply use document.getElementById("my-link").innerHTML = "New Text", but you should put an id attribute to your <a> tag like so:
<a id="my-link" href="www.abc.com" rel="prev">
^^^^^^^^^^^^
Or, if you don't want to edit anything on your original HTML (bad practice):
document.getElementsByTagName("a")[0].innerHTML = "New Text";

You can access such DOM object by using
document.getElementsByClassName("childdiv")[0].childNodes[1].textContent="Updated Text";

I don't really understand your issue but I have tried this and it's working...
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>
and jQuery
$(".link").click(function(e){
e.preventDefault();
$(this).text("New Text");
});
https://jsfiddle.net/294m3my6/
If you want JavaScript
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>
And JS
function Action(evt) {
evt.preventDefault();
document.getElementById("link").innerHTML = "Next Text";
}
document.getElementById('link').addEventListener(
'click', Action, false
);
https://jsfiddle.net/ep3v5u0k/

#Amani has solve my problem. It is what I wanted.
<div class="maindiv">
<div class="childdiv">
Old Text
</div>
</div>
<script>
document.getElementsByClassName("childdiv")[0].getElementsByTagName('a') [0].innerHTML="New Text";
Thanks you so much all of you specially Amani.

Remove div and its content from html string

Lets say i have a string like this:
<div id="div1"></div>
<div class="aClass" id="div2">
<div id="div3" class="anotherClass"></div>
<div id="div4" />
</div>
<div id="div5"></div>
I want to remove div2 from the string and everything inside that div
So i got a string like this
<div id="div1"></div>
<div id="div5"></div>
I thinking something like using regex to find the first div with the id of "div2" or whatever the id of the div is and count brackets untill it gets to "< /div>". The problem is that the "div3" also got a "< /div>" at the end.
The content of the div i want to remove may contain more or less div's then this too.
Any ideas on how to code this?
Update:
var htmlText = editor3.getValue();
var jHtmlObject = jQuery(htmlText);
jHtmlObject.find("#div2").remove();
var newHtml = jHtmlObject.html();
console.log(newHtml);
Why doesn't this return anything in the console?
Update2!:
I have made a jsFiddle to make my problem visual..
http://jsfiddle.net/WGXHS/

Just put the string into jQuery and use find and then remove.
var htmlString = '<div id="div1"></div>\
<div class="aClass" id="div2">\
<div id="div3" class="anotherClass"></div>\
<div id="div4" />\
</div>\
<div id="div5"></div>';
var jHtmlObject = jQuery(htmlString);
var editor = jQuery("<p>").append(jHtmlObject);
editor.find("#div2").remove();
var newHtml = editor.html();

If you have access to jQuery and your HTML is part of the DOM you can use $.remove()
EG. $('#div2').remove();
If it's not part of the DOM, and you have it in a string, you can do something like:
$('#div2', $(myHTML)).remove();

jQuery .remove() will do
$("#div2").remove();

The regex option would work if you control generating the string so you can ensure things like order of the attributes and indentation. If not your best bet is to use an HTML parser. If you are working inside of a browser jQuery is a good option. If you are working server-side you'll need to find a parser for the language you chose.

Move all contents after a particular div under a different tag

I want to move all the text(html content) after a div(which is again under a div) to another tag.
For example, if i have a page like below, i want to move everything after div2 to body:
<body>
<div id=div1>
<div id=div2></div>
<div id=div3></div>
<script>blah</script>
and much more
</div>
</body>
to
<body>
<div id=div1>
<div id=div2></div>
</div>
<div id=div3></div>
<script>blah</script>
and much more
</body>
How can i do this?
Using
$('#div').appendTo('body');
only moves that div.

You can achieve this using jQuery.
var elems = $("#div2").nextAll();
$('body').append(elems );
jsfiddle

As of my tries, response above isn't correct because it doesn't move the text nodes.
Try this, hope it's what you are looking for:
​var $div = $("#div2"​), $con = $div.parent().contents();
$con.slice($con.index($div)+1).appendTo("body");
​
jsfiddle

Retrieve text from an element and insert it somewhere else

I'd like to get the text from between the "p" tags and put it in an other element, like this:
before:
<div id="Text">
<p>$1,200.00</p>
</div>
<div id="putText">
<p></p>
</div>
after:
<div id="Text">
<p>$1,200.00</p>
</div>
<div id="putText">
<p>$1,200.00</p>
</div>
Anyone know of a Javascript that can do this?

The below function copies the contents of the first paragraph under an element with ID ID to a paragraph under another element with ID putID.
function copyContents(id) {
var source = document.getElementById(id).getElementsByTagName("p")[0];
var target = document.getElementById("put" + id).getElementsByTagName("p")[0];
target.innerHTML = source.innerHTML;
}
copyContents("Text");

you can use following jQuery code
$('#putText p').html($('#Text p').html());

If you have jQuery at your disposal, it's fairly easy - something like this should work:
$('#putText>p').text($('#Text>p').text())
If you don't, then you'll have to resort to some DOM manipulation - the same stuff jQuery does behind the scenes, only you need to code it up yourself.