Question

I have a web-based application which is very highly reliant on jquery / javascript, and its sometimes a bit slow. One of the things that gets done frequently is changes to the grid (jqGrid) which means each time I’m using jQuery to select that object, ie:

function load_editor() { $('#listview').jqGrid(do_stuff); }

I believe simply storing a reference to $(‘#listview’) – since its used in a half dozen functions – would be quicker. So is there any drawback to setting it up like this:

listview = $('#listview');
function load_editor() { listview.jqGrid(do_stuff); }

It would seem this way common objects are already in memory, and wont incur the penalty of the lookup on each use. Is there any downside to structuring this way?

( I’m aware in my examples, I’m throwing out a global. Its all nicely encapsulated in an object in the actual project, I just am using these examples to illustrate my point. )

Answer 1

Absolutely you should.

And I strongly recommend you follow the style of the linked article – name your jQuery object variables with a $ prefix. Knowing which of your variables are jQuery objects just by looking at them will be of great help to you when your project becomes large.