How To Search For Value based on an array

[refiking]

I need some help with how this can be done.  I want to list email addresses in an array.  Then, when a use submits the form, I want the existing validation function to simply check to see if the email address entered matches ANY of the values in the array.  How can I do this?

 

if(document.getElementById('email').value == array errors += '- '+'Email address already exists.\n';

[rajivgonsalves]

you'll have to write a custom function or you can try this

 

if(array.join(',').indexOf(document.getElementById('email').value)) errors += '- '+'Email address already exists.\n';

 

not sure if it work correctly but its worth a try

[optikalefx]

Hmm, this is a common task, are you putting the values in an array just for this?  If so, don't do that. Just check in your loop.

 

If you already have an array, then you can use

 

Array.prototype.inArray = function (value) {
var i;
for (i=0; i < this.length; i++) {
	if (this[i] === value) {
		return true;
	}
}
return false;
};

 

now just do array.inArray("value to find");

[optikalefx]

Or if you are using jQuery

 

$.inArray("John", arr)