Can you use jquery to add comments dynamically to code?

Question

I tried:

<script>
$(function() {
$('.class').before('<!--');
$('.class').after('-->');
});

</script>

but it didn't work for a reason unknown to me.

Can anyone help me understand why it didn't work and how I would do it? Thank you, much appreciated.

Answer 1

It looks like you're trying to make objects with .class disappear. Use .hide() instead. Comments are only parsed when the browser first loads the page, so adding comments won't comment something out.

You need to learn the difference between HTML and the DOM. HTML is the textual representation of the page, but the browser parses it into the DOM on page load. JavaScript works on the DOM, not on the HTML. Using .innerHtml() on DOM elements reparses the HTML.

Here's an example of using innerHtml() to hide elements using HTML comments (but note that I would never do this - I'm only showing how to do what it looked like you were trying to do in your question):

HTML:

<h1>hello</h1>

<div>
    <p>wow</p>
    <p>dude</p>
</div>​

JavaScript (+ jQuery):

$(document).ready(function () {
    setTimeout(hideIt, 1000);
});

function hideIt() {
    $('div').html('<!--' + $('div').html() + '-->');
}​

Answer 2

I think you would need prepend and append to do it the way you are thinking. Not sure if it would actually make things disappear though.

If you want something to not be visible, your best bet would be to use hide().

Answer 3

Using .hide() is a better way to achieve what you want. Also worth mentioning that comment objects are part of the DOM so in theory you could manipulate them (or add new ones) using jQuery.

Answer 4

No, you can't add a starting and ending commend tag like that. The comment tag is a single tag, it's not a seprate starting tag and ending tag. So, <!-- and --> are not a valid HTML fragments, as they don't contain complete tags.

If you want to put an element inside a comment, it's no element any more, so to do that you would have to get the HTML code for the element, put a comment tag around it, and replace the element with the comment.

If you do this to hide the element, you should simply use the hide method instead.

Answer 5

Some options:

$('.mycurrentclass').remove(); 

$('.mycurrentclass').detach();// see below for possible use

$('.mycurrentclass').css({display:'none'});

$('.mycurrentclass').hide(); 

$('.mycurrentclass').toggleClass('myhiddenclass');

$('.mycurrentclass').addClass("myhiddenclass");

$("myselector").toggle(
  function () {
    $(this).addClass("myhiddenclass");
  },
  function () {
    $(this).removeClass("myhiddenclass");
  }
);

// programtic like you seem to want:(first part puts it back, else detaches it)
var p;
if ( p ) 
{
  p.appendTo("mywheretoappenditselector");
  p = null;
} 
else 
{
  p = $("myselector").detach();
};

Answer 6

To provide a more direct answer, use:

var gonee = $('.myclass');
$('.myclass').replaceWith('<!--' + gonee + '-->');

see me in action: http://jsfiddle.net/YNe6w/1/

Answer 7

pls use .html() to add html content dynamically

eg:

  $(.dv).click(function(){
 $(".dy").html("abcd");
 });
 <div class=".dy" >
 </div>

try it and hope it will work for you