JavaScript document.getElementById as jQuery selector document.getelementbyid jquery,document.getelementbyid jquery alternative,document.getelementbyid jquery

I saw this pattern being used in some code...

currency = $(document.getElementById('currency'));

Which is expect is functionally equivalent to...

currency = $('#currency');

I am guessing the idea is to make the selector faster, as it does not need to parse the selection string... but does it really make a discernible difference? Is there something else at play I have not considered?

Why would someone use this kind of pattern?

Answer:1

Internally, when parsing the selector string passed, jQuery automatically detects that you passed an id selector and calls document.getElementById for you.

So, when you're fetching the element yourself prior the call to jQuery, you're only saving the selector parsing portion, but that's negligible for most use cases.

See source

Answer:2

$(document.getElementById('currency')); is less readable and in the end there will be getElementById called anyway. You will not see it's effect in most cases (element is cached and will be called only once).

Answer:3

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