document.getElementById vs jQuery $()

document.getelementbyid vs jquery performance
document getelementbyid vs
jquery getelementbyid value
jquery id selector not working
document.getelementbyid value
document getelementbyid equivalent in jquery
how to replace document getelementbyid with jquery
jquery innerhtml

Is this:

var contents = document.getElementById('contents');

The same as this:

var contents = $('#contents');

Given that jQuery is loaded?

Not exactly!!

document.getElementById('contents'); //returns a HTML DOM Object

var contents = $('#contents');  //returns a jQuery Object

In jQuery, to get the same result as document.getElementById, you can access the jQuery Object and get the first element in the object (Remember JavaScript objects act similar to associative arrays).

var contents = $('#contents')[0]; //returns a HTML DOM Object

document.getElementById vs jQuery $(), The difference is that the jQuery object is just a wrapper around the element. These two functions will return a completely different object, so you can’t simply replace every getElementById () with $ ('#foo'). This will break your code. The main difference is that the jQuery object is just a wrapper around the element. Let’s see this difference a bit more in detail.

No.

Calling document.getElementById('id') will return a raw DOM object.

Calling $('#id') will return a jQuery object that wraps the DOM object and provides jQuery methods.

Thus, you can only call jQuery methods like css() or animate() on the $() call.

You can also write $(document.getElementById('id')), which will return a jQuery object and is equivalent to $('#id').

You can get the underlying DOM object from a jQuery object by writing $('#id')[0].

The Difference Between document.getElementById() and jQuery , version added: 1.0jQuery( "#id" )​​ For id selectors, jQuery uses the JavaScript function document. getElementById() , which is extremely efficient. Calling jQuery() (or $() ) with an id selector as its argument will return a jQuery object containing a collection of either zero or one DOM element. Calling $ ('#id') will return a jQuery object that wraps the DOM object and provides jQuery methods. Thus, you can only call jQuery methods like css () or animate () on the $ () call. You can also write $ (document.getElementById ('id')), which will return a jQuery object and is equivalent to $ ('#id').

Close, but not the same. They're getting the same element, but the jQuery version is wrapped in a jQuery object.

The equivalent would be this

var contents = $('#contents').get(0);

or this

var contents = $('#contents')[0];

These will pull the element out of the jQuery object.

ID Selector (“#id”), jQuery's $() selector is probably the most common and the first one that comes to mind • document.getElementById is the classic method and  What are the possible reasons for document.getElementById, $("#id") or any other DOM method / jQuery selector not finding the elements? Example problems include: jQuery silently failing to bind an

A note on the difference in speed. Attach the following snipet to an onclick call:

function myfunc()
{
    var timer = new Date();

        for(var i = 0; i < 10000; i++)
        {
            //document.getElementById('myID');
            $('#myID')[0];
        }


    console.log('timer: ' + (new Date() - timer));
}

Alternate commenting one out and then comment the other out. In my tests,

document.getElementbyId averaged about 35ms (fluctuating from 25ms up to 52ms on about 15 runs)

On the other hand, the

jQuery averaged about 200ms (ranging from 181ms to 222ms on about 15 runs).

From this simple test you can see that the jQuery took about 6 times as long.

Of course, that is over 10000 iterations so in a simpler situation I would probably use the jQuery for ease of use and all of the other cool things like .animate and .fadeTo. But yes, technically getElementById is quite a bit faster.

jQuery vs getElementById vs querySelector, getElementbyId( "myId") Vs. $("#myId). The document.getElementbyId( "myId") is faster because its direct call to JavaScript engine. jQuery is a wrapper that  Javascript querySelector vs. getElementById [closed] Ask Question angular.element vs document.getElementById or jQuery selector with spin (busy) control. 2.

No. The first returns a DOM element, or null, whereas the second always returns a jQuery object. The jQuery object will be empty if no element with the id of contents was matched.

The DOM element returned by document.getElementById('contents') allows you to do things such as change the .innerHTML (or .value) etc, however you'll need to use jQuery methods on the jQuery Object.

var contents = $('#contents').get(0);

Is more equivilent, however if no element with the id of contents is matched, document.getElementById('contents') will return null, but $('#contents').get(0) will return undefined.

One benefit on using the jQuery object is that you won't get any errors if no elements were returned, as an object is always returned. However you will get errors if you try to perform operations on the null returned by document.getElementById

Which one is more efficient, document.getElementbyId( "myId") or , The Document method getElementById() returns an Element object representing the element whose id property matches the specified string. getElementById is faster, because it uses native code. The jQuery selector will also use getElementById, but it first needs to do a lot of tests and comparisons on the text.

Working with JavaScript DOM objects vs. jQuery objects, jQuery by id vs Document.getElementById (version: 0). Comparing speed of getting element by id with jQuery vs Vanilla JS. Comparing performance of: jQuery  In jquery function I build string for id and than I want to change some value on it but it seams that jquery can't find element with this id, but it's there on the page: Js cant get element by id. The problem is that you are trying to access the element before it exists. You need to wait for the page to be fully loaded.

Document.getElementById(), getElementById('contents'); //returns a HTML DOM Object var contents =. вызывать только методы jQuery, такие как css() или animate() в вызове $() . document.getElementById(idname) — fetches a single node by its ID name document.getElementsByTagName(tagname) — fetches nodes matching an element (e.g. h1, p, strong, etc).

Benchmark: jQuery by id vs Document.getElementById , • jQuery’s $() selector is probably the most common and the first one that comes to mind • document.getElementById is the classic method and perhaps the function that most JS developers are taught first • document.querySelector is a relatively recent addition to the DOM API that’s supported by the latest browser versions out there

Comments
  • In addition to the points raised in the answers, the jQuery version is app. 100x slower.
  • is this proven somewhere?
  • @torazaburo Actually, jQuery version is not even 3 times slower (at least at latest Chrome). See: jsperf.com/getelementbyid-vs-jquery-id/44
  • @MichałPerłakowski in that link the jquery version is 10 times slower. 26mil vs 2.4mil
  • Correct updated link for JSPerf is: jsperf.com/getelementbyid-vs-jquery-id In my case (FF 58) it's 1000 times slower. Anyway, jQuery still performs 2.5 millions ops per second. In general that's not a problem, and it certainly cannot be compared in terms of functionality.
  • For anyone interested document.getElementBy doesn't work correctly in <IE8. It also gets elements by name therefore you could theoretically argue document.getElementById is not only misleading, but can return incorrect values. I think @John new this, but I thought it wouldn't hurt to add it in.
  • Take care if your identifier is not fixed. $('#'+id)[0] is not equal to document.getElementById(id) because id may contain characters which are treated special in jQuery!
  • This was very helpful - never knew this! I'm sure I've actually used it before, though, which is what baffles me. Hey, you learn something every day! Thanks!
  • google jquery equivalent of document.getelementbyid and the first result is this post. thank you!!!
  • $('#contents')[0].id returns id name.
  • Do you happen to know which one is faster - $(document.getElementById('element')) vs $('#element')?
  • @IvanIvković: The first one is faster, since it doesn't involve string parsing.