Thanks for the further input, Ricardo... Is there any way you can put a percentage of processing and/or time saved by using var with elements? Especially if there is only one or two references on a page?
Rick -----Original Message----- From: jquery-en@googlegroups.com [mailto:jquery...@googlegroups.com] On Behalf Of ricardobeat Sent: Thursday, March 05, 2009 11:00 AM To: jQuery (English) Subject: [jQuery] Re: Simple one: difference between varXy.find(':text') and $(varXy).find(':text') It's mostly done to improve performance. If you save the jQuery object in a var you only need to find the element once (depending on the selector it's an expensive operation), and then operate on that single object. I (and other people) like to put a '$' in front of the var name when it contains a jQ object, to make it clear: var $mySet = $('.mystuff'); //jQ object $mySet.click(...).append(...) var myElement = $('#someelement')[0]; //HTML element $(myElement).doSomething(); by doing $($mySet) you're unnecessarily creating a new object from the one you have already stored. It's not really much overhead, but bloats code. ggerri: this.something() where 'something' is a jQuery method is usually found in plug-ins: jQuery.fn.doSomething = function(){ // in here, 'this' refers to the current jQuery object/set //so you can use methods on it, like each this.each(function(){ // here, 'this' is the current element in the loop, not a jq object //so you need to wrap it in jQ before using it $(this).append(...) }); }; cheers, - ricardo On Mar 5, 9:58 am, "Rick Faircloth" <r...@whitestonemedia.com> wrote: > Hi, Rayn :handshake: :o) > > I think, for shorthand notation (some say for readability, but I think > otherwise), some set var's (variables) to represent pieces of code, for instance: > > var mySet = '$(mySet)' > > and then use it as: > > mySet.find(':text')... > > Written in "longhand", it would be: > > $('mySet').find(':text')... > > When trying to read someone else's code, where this shorthand is use > extensively, I just find it hard to decipher, since I have to trace > all the var's down to find out what they stand for... > > Someone please correct me if I'm wrong... > > Rick > > -----Original Message----- > From: jquery-en@googlegroups.com [mailto:jquery...@googlegroups.com] > On Behalf Of ggerri > Sent: Thursday, March 05, 2009 7:31 AM > To: jquery-en@googlegroups.com > Subject: [jQuery] Re: Simple one: difference between > varXy.find(':text') and $(varXy).find(':text') > > Thanks Ryan :handshake: > > so mySet.find(':text').each(...) would be right and > $(mySet).find(':text').each(...) not? :confused: > > In examples I often see (within an each function): $(this).something > but also this.something > > Still dont get the difference of use :,( > > G > > ryan.joyce...@googlemail.com wrote: > > > mySet is an object or variable, $(mySet) will try to get an element > > using the contents of mySet as the selector. > > > On Mar 5, 10:04 am, ggerri <gerald.ressm...@ewz.ch> wrote: > >> Hi there > > >> thats an easy one for you ;-) > > >> if i do: > > >> var mySet = $('tr>td:nth-child(2n)'); > > >> how do I use mySet? What's the difference between > > >> mySet.find(':text') > > >> and > > >> $(mySet).find(':text') > > >> Thanks :-)) > >> GGerri > > >> -- > >> View this message in > >> context:http://www.nabble.com/Simple-one%3A-difference-between-varXy.find%28 %... > >> Sent from the jQuery General Discussion mailing list archive at > >> Nabble.com. > > -- > View this message in context:http://www.nabble.com/Simple-one%3A-difference-between-varXy.find%28 %... > Sent from the jQuery General Discussion mailing list archive at Nabble.com.
