Bug Tracker

Opened 14 years ago

Closed 14 years ago

Last modified 14 years ago

#1141 closed bug (worksforme)

$('#id').height() and $('#id').width() performance under IE7 — at Version 3

Reported by: Ihsahn Owned by: paul
Priority: major Milestone: 1.1.3
Component: dimensions Version: 1.1.2
Keywords: Cc:
Blocked by: Blocking:

Description (last modified by brandon)

There's a big problem with performance of $('#id').height() and $('#id').width() under IE. It's noticably slower than under FF or Opera. I had to switch to document.getElementById(id).offsetWidth and document.getElementById(id).offsetHeight to avoid freezing IE on resizing ;/

I will try to provide testcase for this, later.

Change History (3)

comment:1 Changed 14 years ago by arrix

if !$('#id').is(:visible), jQuery tries to clone the node, append to DOM, calculate the dimension and remove the cloned node. These steps significantly slow down execution especially when the element is large.

The performance seems to be OK for me when the element is visible.

comment:2 Changed 14 years ago by dcpedit

The slow performace is also visible in IE 6

comment:3 Changed 14 years ago by brandon

Component: dimensionscore
Description: modified (diff)
Resolution: worksforme
Status: newclosed

width and height methods in dimensions just fall back to the jQuery core when using a selector. If the element is hidden, then some extra steps are necessary to get the width and height. Please note that that width and offsetWidth are not the same thing. Getting the width and height of a hidden element is slow and should be cached and not called on window resize in IE since IE fires that event a lot!

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