javascript - Caching jQuery variables -

-

i read if referring same dom element on , on in function better cache them in local variable :

var btn = $('#clearbtn');

i have followed necessary when accessing object have used $(btn).somemethod(); although can access directly btn.somemethod();

i need know whether have negative impact ?

there's no point in passing jquery object through jquery constructor. it's wasteful. if dollar sign looks nice you, prepend variable name , use $btn in place of $(btn):

var $btn = $('#clearbtn');

Comments

Post a Comment

Popular posts from this blog

Line ending issue with Mercurial or Visual Studio -

-
i seem have strange issue caused either visual studio or mercurial. localised single project, i'm guessing in project configuration causing issue. at difficult specify point, when perform action in visual studio, update every line ending in given file, means when @ file in sourcetree, every line has changed. i can replicate using nuget add package dependency; packages.config entirely replaced. if commit changes, including line endings, later same issue occur. workaround have shelve changes , reapply them, whereupon lines written correctly. i'm not sure application blame here. did make mistake of allowing sourcetree change mercurial configuration, issue have fixed, i'm not sure if has persisted. i thought might issue mercurial.ini files or hgrcs don't seem contain untoward. here's mercurial.ini [ui] username = .... [auth] bb.prefix = https://bitbucket.org/ bb.username = .... bb.password = .... [extensions] mq = rebase = [web] allow_push = * push_s...
Read more

tags - Jquery Mixitup plugin help prevent handlers being destroyed -

-
update : error in console. uncaught exception: query function not defined select2 undefined i using code allow users add tags images. works fine. problem running when images sorted(using mixitup.io plugin). before sorting, script works perfect(popup,edit,save,db update). after user clicks few of sort buttons, script stops responding , popup not fire. please have below , me find problem is. :) working code: $('.tags').editable({ placement: 'top', select2: { tags: ['cookies', 'pie','cake'], tokenseparators: [","] }, display: function(value) { $.each(value,function(i){ value[i] = "<span class='tagbox'>" + $('<p>' + value[i] + '</p>').text() + "</span>"; }); $(this).html(value.join(" ")); } }); to prevent mixitup.io plugin destroying handler, says use "delegate()"...
Read more

c# - Delving into the world of XML (Windows Phone) Error I dont understand (The ' ' character, hexadecimal value 0x20, cannot be included in a name.) -

-
so starting learn how use xml data within app , decided use free data cannot life of me working code far. (i have done few apps static data before hey apps designed use web right? :p) public partial class mainpage : phoneapplicationpage { list<xmlitem> xmlitems = new list<xmlitem>(); // constructor public mainpage() { initializecomponent(); loadxmlitems("http://hatrafficinfo.dft.gov.uk/feeds/datex/england/currentroadworks/content.xml"); test(); } public void test() { foreach (xmlitem item in xmlitems) { testing.text = item.title; } } public void loadxmlitems(string xmlurl) { webclient client = new webclient(); client.openreadcompleted += (sender, e) => { if (e.error != null) return; stream str = e.result; xdocument xdoc = xdocument.load(str); ***xmlitems = (from ite...
Read more