I'm trying to test if the .prop()
method exists on the current jQuery included (for compatibility reason) via:
if(typeof $.prop === 'function')
I would expect that the condition above is true
for jQuery >= 1.6
and false
for jQuery < 1.6
as I can understand from the docs
Anyway, testing this on jsfiddle, leads to:
typeof $.prop === 'function'
is:
true
when jQuery >= 1.6
false
when jQuery < 1.6 and jQuery > 1.3
true
when jQuery <= 1.3
here is the very very simple script which provide the results above (just switch jQuery version to see what I've described).
When I try to use that .prop()
with jQuery i.e. 1.3 I get the .prop is not a function
error.
The same problem occours also testing outside jsfiddle.
Is it normal such a behavior?
How could I truly test if .prop()
is available?
Thanks
alert(typeof $.fn.prop === 'function')
You want to check for the .prop
method on the jQuery prototype which lives on $.fn
. This is false in 1.3.
Also I would avoid feature detection for jQuery versions and instead support a particular version (and up).
What I did, is build a compatible function for prop, for jQuery versions, which doesn't use prop:
(function($){
if (typeof $.fn.prop !== 'function')
$.fn.prop = function(name, value){
if (typeof value === 'undefined') {
return this.attr(name);
} else {
return this.attr(name, value);
}
};
})(jQuery);
You can test this code: http://jsfiddle.net/JtK2Q
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