Server side validation to Block Free Emails (Gmail, Yahoo)

Hi,
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I wish I can Block Free Emails (Gmail, Yahoo) and allow Business emails in forms. I've seen how to do so with server side validation, but I wish I can do it wit client-side validation.
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Any advice?
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Thanks

You want to block the largest email providers in the world? Well sure off you go, you can make a custom JS validation there's a FAQ about it.
https://www.chronoengine.com/faqs/74-chronoforms/chronoforms6/5293-validating-fields

Hi Healyhatman,
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as a matter of fact I need people's corporate email adress and I want to prevent them to put generic email adress.
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I've already found a very good post by Greyhead :
https://www.chronoengine.com/forums/posts/t84695/block-e-mail-domains
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But in this post it seems to me that it is a server side validation in php. I need instead a a client side validation.
So I though I need to put the name of a javascript piece of code in the Custom Function Box of the element I need to validate. Can I put a php code instead ?
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Thanks!

No you can't, because PHP is serverside code. You'll have to code it yourself. Also be aware that a lot of small businesses still use GMail addresses, especially if they don't have their own website and sometimes even if they do.

Thanks Healyhatman!

http://www.sagarnangare.net/javascript-validation-code-to-block-free-emails-gmail-yahoo-allow-business-emails-in-forms/
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With modifications

jQuery.fn.form.settings.rules.nofreemails = function(value) {
   var reg = /^([\w-\.]+@(?!gmail.com)(?!yahoo.com)(?!hotmail.com)(?!yahoo.co.in)(?!aol.com)(?!abc.com)(?!xyz.com)(?!pqr.com)(?!rediffmail.com)(?!live.com)(?!outlook.com)(?!me.com)(?!msn.com)(?!ymail.com)([\w-]+\.)+[\w-]{2,4})?$/;
   return !(reg.test(value)); 
};

Then in your validation rules for the field you would put

nofreemails:You must not use a free email, only corporate emails are allowed!