How to check if a value is NOT in an array using jQuery

Question

I'm having some trouble with checking if a value is not in an array. I'm trying to allow only certain key presses in a textbox.

Here's what I have:

var keyCodeArr = [ 8,9,13,17,18,37,39,46 ];
$('#txtSearch').keydown(function(event) {
var code = event.keyCode;
if (!$.inArray(code,keyCodeArr)) {
 event.preventDefault();
}
});

It's allowing anything in the textbox. I looked at the documentation for $.inArray(), which show an example for seeing if a value is in an array, so I thought just adding the NOT in front of it would do the trick.

Or is it that I'm not initializing the array correctly in the first place?

What am I missing?

• adeneo: The docs says to check for -1 values, and event.which is normalized in jQuery.
• Peter: I looked at the documentation for $.inArray() and I see if we're checking for the presence of value within array, we need to check if it's not equal to (or greater than) -1.

Answer 1

Using jquery:

if (!~$.inArray(code,keyCodeArr)) {
 ...
}

• marky: Thanks, roasted for the code and adeneo and Peter for pointing out to me that I didn't read the docs close enough!