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Validate Email is from Specific Domain

We have a php form that collects some basic information ...

- email
- firstname
- lastname
- company

This signup form is specific to one client so we want to block everyone else from signing up.

Examples of correct email addresses ...

dave@change-domain.co.uk
sue@change-domain.co.uk
sales@change-domain.co.uk
anything@change-domain.co.uk

Any address that does not use '@change-domain.co.uk' is incorrect and should throw up an error ...

"sorry - that email is not valid"

We want the check to be made before form submission - so, after the user enters their email address and tabs to the next field.

Thanks.

Om Prakash

//Add following javascript validation
var str= document.form1.emailfield.value;
var a2 = str.toLowerCase();
if(a2.indexOf("@change-domain.co.uk") == -1)
{
alert("sorry - that email is not valid");
}

JohnSixkiller

<input type='text' name='email' id='email' onchange='validateEmail(this)'>

function validateEmail(Sender){
var validSuffix = "change-domain.co.uk";
var emailSuffix = Sender.value.substring(Sender.value.indexOf("@")+1);

if(validSuffix != emailSuffix){
alert("sorry - that email is not valid");
Sender.value = "";
Sender.focus();
}
}

poldings

ASKER

JohnSixkiller:
That works great. Just one thing to make it a bit more user friendly pls ...

How can I adapt it so the focus is back on the 'email' field after the alert has closed?

ASKER CERTIFIED SOLUTION

JohnSixkiller

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ASKER

Perfect. Works a treat.