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How to add a new attribute for a HTML element before added to DOM with jQuery

Actually it could happen that's the title it's not exactly correct, so sorry.
My problem is the following. I have a variable (what contains html), what it get from ajax response and i would like to add new attribute a few element. And after it insert to the dom.
For example, here this:
ajaxString = "<b>asd</b>";
replaced = $("b", $(ajaxString) ).css('background','#ff0000');
$("body").html(replaced);
But it's doesn't work. I hope, somebody have an idea!
Thanks for the Help!

This can be done using a virtual element:
var ajaxString = "<b>asd</b>",
virtualDiv = $('<div>', {html: ajaxString});
$("b", $(virtualDiv)).css('background', '#ff0000');
$("body").html($("b", $(virtualDiv))[0]);
As per your comment you can use this to get all the html of virtual div:
$("body").html($(virtualDiv).html());

You can create the element in a jQuery object first, then amend its attributes before appending it. Try this:
$("<b>asd</b>").css('background', '#ff0000').appendTo('body');

here is a working fiddle of what you try to achieve
you should use filter
var newhtml = $('<b>asd</b><p>asd</p>');
newhtml.filter('b').each(function(){
$(this).css('font-size','50px')
$(this).css('color','blue')
});
newhtml.filter('p').each(function(){
$(this).css('font-size','20px')
$(this).css('color','red')
});
$('body').html(newhtml);
https://jsfiddle.net/c7a6spaj/
Cheers

Change text inside <h2> Text I would change </h2> element using javascript

I need to change the text inside HTML element using javascript, but I have no idea about how to do it. ¿Any help?
I've got it defined like:
<h2 id="something">Text I want to change.</h2>
Im trying to do it with:
document.getElementById("something").value = "new text";
But it doesn't work.
Thanks

You can use innerHTML:
document.getElementById("something").innerHTML = "new text";

If the element only contains text, textContent works better and faster than innerHTML
document.getElementById("something").textContent = 'new text';
Good luck
:)

Though the following code would be the fastest alternative to slow .innerHTML:
var element = document.getElementById('something');
// removing everything inside the node
while (element.firstChild) {
element.removeChild(element.firstChild);
}
// appending new text node
element.appendChild(document.createTextNode('new text'));
And here is the benchmark:
JSPerf: http://jsperf.com/replace-text-in-node

Extracting text from a HTML to be stored as a JS variable, then to be added to a separate HTML's element

Alrite, I have seen other Questions with similar titles but they don't do exactly what Im asking.
I have 2 x HTML documents, one containing my page, one containing a element with a paragraph of text in it. As-well as a separate .js file
what I want to do is extract this text, store it as a JS variable and then use jQuery to edit the contents of an element within the main page. This is the conclusion I came to but it didnt work as expected, im not sure if it is me making a syntax error or if i am using the wrong code completely:
$(document).ready(function(){
var c1=(#homec.substring(0))
// #homec is the container of the text i need
$(".nav_btn #1").click(function(c1){
$(".pcontent span p") .html(+c1)}
);
});
i know +c1 is most probably wrong, but i have been struggling to find the syntax on this one. thankyou in advance :D

var c1=(#homec.substring(0)) will throw an error because #homec is not a valid variable name, is undefined, and does not have a property function called substring. To get the html of an element with an id of homec, use the html method:
var c1 = $("#homec").html();
c1 should not be an argument of the click function because it is defined in the parent scope. +c1 is unnecessary because you do not need to coerce c1 to a number.
If you are trying to add content to the end of the paragraph, use the append method:
$(".pcontent span p").append(c1)
That means you should use this code instead:
$(document).ready(function() {
var c1 = $("#homec").html();
$(".nav_btn #1").click(function() {
$(".pcontent span p").append(c1)
});
});
P.S. Numbers are not valid ID attributes in HTML. Browsers support it, so it won't make anything go awry, but your pages won't validate.

Try this:
$(".nav_btn #1").click(function(c1){
var para = $(".pcontent span p");
para.html(para.html() + c1);
});

The JQuery text() function will allow you to get the combined text contents of each element in the set of matched elements, including their descendants. You can then use the text(value) function to set the text content of your target paragraph element. Something like this should suffice:
$(document).ready(function() {
var c1 = $("homec").text();
$(".nav_btn #1").click(function() {
$(".pcontent span p").text(c1);
});
});
See the JQuery documentation for more details on the text() function. If you need to capture the full structure of the other document, then try the html() function instead.

How to append text to a div element?

I’m using AJAX to append data to a <div> element, where I fill the <div> from JavaScript. How can I append new data to the <div> without losing the previous data found in it?

Try this:
var div = document.getElementById('divID');
div.innerHTML += 'Extra stuff';

Using appendChild:
var theDiv = document.getElementById("<ID_OF_THE_DIV>");
var content = document.createTextNode("<YOUR_CONTENT>");
theDiv.appendChild(content);
Using innerHTML:
This approach will remove all the listeners to the existing elements as mentioned by #BiAiB. So use caution if you are planning to use this version.
var theDiv = document.getElementById("<ID_OF_THE_DIV>");
theDiv.innerHTML += "<YOUR_CONTENT>";

Beware of innerHTML, you sort of lose something when you use it:
theDiv.innerHTML += 'content';
Is equivalent to:
theDiv.innerHTML = theDiv.innerHTML + 'content';
Which will destroy all nodes inside your div and recreate new ones. All references and listeners to elements inside it will be lost.
If you need to keep them (when you have attached a click handler, for example), you have to append the new contents with the DOM functions(appendChild,insertAfter,insertBefore):
var newNode = document.createElement('div');
newNode.innerHTML = data;
theDiv.appendChild(newNode);

If you want to do it fast and don't want to lose references and listeners use: .insertAdjacentHTML();
"It does not reparse the element it is being used on and thus it does not corrupt the existing elements inside the element. This, and avoiding the extra step of serialization make it much faster than direct innerHTML manipulation."
Supported on all mainline browsers (IE6+, FF8+,All Others and Mobile): http://caniuse.com/#feat=insertadjacenthtml
Example from https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML
// <div id="one">one</div>
var d1 = document.getElementById('one');
d1.insertAdjacentHTML('afterend', '<div id="two">two</div>');
// At this point, the new structure is:
// <div id="one">one</div><div id="two">two</div>

If you are using jQuery you can use $('#mydiv').append('html content') and it will keep the existing content.
http://api.jquery.com/append/

IE9+ (Vista+) solution, without creating new text nodes:
var div = document.getElementById("divID");
div.textContent += data + " ";
However, this didn't quite do the trick for me since I needed a new line after each message, so my DIV turned into a styled UL with this code:
var li = document.createElement("li");
var text = document.createTextNode(data);
li.appendChild(text);
ul.appendChild(li);
From https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent :
Differences from innerHTML
innerHTML returns the HTML as its name indicates. Quite often, in order to retrieve or write text within an element, people use innerHTML. textContent should be used instead. Because the text is not parsed as HTML, it's likely to have better performance. Moreover, this avoids an XSS attack vector.

Even this will work:
var div = document.getElementById('divID');
div.innerHTML += 'Text to append';

An option that I think is better than any of the ones mentioned so far is Element.insertAdjacentText().
// Example listener on a child element
// Included in this snippet to show that the listener does not get corrupted
document.querySelector('button').addEventListener('click', () => {
console.log('click');
});
// to actually insert the text:
document.querySelector('div').insertAdjacentText('beforeend', 'more text');
<div>
<button>click</button>
</div>
Advantages to this approach include:
Does not modify the existing nodes in the DOM; does not corrupt event listeners
Inserts text, not HTML (Best to only use .insertAdjacentHTML when deliberately inserting HTML - using it unnecessarily is less semantically appropriate and can increase the risk of XSS)
Flexible; the first argument to .insertAdjacentText may be beforebegin, beforeend, afterbegin, afterend, depending on where you'd like the text to be inserted

you can use jQuery. which make it very simple.
just download the jQuery file add jQuery into your HTML
or you can user online link:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
and try this:
$("#divID").append(data);

The following method is less general than others however it's great when you are sure that your last child node of the div is already a text node. In this way you won't create a new text node using appendData MDN Reference AppendData
let mydiv = document.getElementById("divId");
let lastChild = mydiv.lastChild;
if(lastChild && lastChild.nodeType === Node.TEXT_NODE ) //test if there is at least a node and the last is a text node
lastChild.appendData("YOUR TEXT CONTENT");

java script
document.getElementById("divID").html("this text will be added to div");
jquery
$("#divID").html("this text will be added to div");
Use .html() without any arguments to see that you have entered.
You can use the browser console to quickly test these functions before using them in your code.

Why not just use setAttribute ?
thisDiv.setAttribute('attrName','data you wish to append');
Then you can get this data by :
thisDiv.attrName;

Remove tag around a text node using javascript

If I have some HTML that looks like this:
<div id="text">
This is some text that is being written <span class="highlight">with
a highlighted section</span> and some text following it.
</div>
And I want to remove the "span" leaving the text node within, how would I go about doing that? I tried using jQuery to do the following:
wrap = $('.highlight');
wrap.children().insertBefore(wrap);
wrap.remove();
But that doesn't work I'm guessing because children returns an empty set since there's only a text node in there. So all that happens is that the span and its contents are removed.
I'm also open to alternatives to my approach here. What's happening is that my code actually creates that span when a user selects a block of text. It wraps the selected text in a span to visually differentiate it. I need to remove the span afterward though because of some quirks with the way mozilla's range object works.
EDIT: I don't want to replace the entire content of '#text' by the way since it could be very large.

You get the text, and replace the span with it:
var wrap = $('.highlight');
var text = wrap.text();
wrap.replaceWith(text);

wrap it in a plugin
(function($) {
$.fn.tagRemover = function() {
return this.each(function() {
var $this = $(this);
var text = $this.text();
$this.replaceWith(text);
});
}
})(jQuery);
and then use like so
$('div span').tagRemover();
Working Demo here - add /edit to the URL to play with the code

This works:
wrap = $('.highlight');
wrap.before(wrap.text());
wrap.remove();

This will do what you want, and also preserve any tags within the .highlight span.
content = $(".highlight").contents();
$(".highlight").replaceWith(content);

element = document.getElementById("span id");
element.parentNode.insertBefore(element.firstChild, element);
element.parentNode.removeChild(element);

text.replace(/</?[^>]+(>|$)/g, "");

it would be much easier to just change the class of the span than to actually remove it. You can use pure javascript:
document.getElementById("span id").className="";
Or jquery's toggleClass function:
$("element").toggleClass("highlight");
Also, best practices say that you shouldn't use class names that imply a style, like highlight. Try "emphasized" instead. :D

A better unwrap plugin:
$.fn.unwrap = function() {
this.parent(':not(body)')
.each(function(){
$(this).replaceWith( this.childNodes );
});
return this;
};
from Ben Alman