Bug Tracker

Opened 15 years ago

Closed 15 years ago

#2453 closed bug (fixed)

attr(...) function returns undefined when value is 0

Reported by: gtong Owned by:
Priority: major Milestone: 1.2.4
Component: core Version: 1.2.3
Keywords: Cc:
Blocked by: Blocking:


The jQuery attribute function returns undefined if the value of the attribute is 0. The HTML code below returns undefined if you select "Foo", but 1 if you select "Bar"

<select id="foo" onChange="alert($('#foo').attr('selectedIndex'))">

<option value="Foo">Foo</option> <option value="Bar" selected>Bar</option>


This is because of the following line (in jQuery 1.2.3 line # 178)

return this.length && jQuery[ type
"attr" ]( this[0], name ) undefined;
The problem here is that the return value of the attr call is 0, which is evaluated as false, and thus passes to the
and returns undefined.

one possible way to fix this is:

if ( this.length ){

var ret = jQuery[ type return ret === 0 ? 0 : (ret
"attr" ]( this[0], name );

} else

return undefined;

Change History (1)

comment:1 Changed 15 years ago by flesler

Resolution: fixed
Status: newclosed

Fixed at [5574], check #2548.

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