How can I allow only gmail and yahoo domains in email id using javascript in ASP .NET

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I have a text box that should accept only gmail and yahoo.com if any thing other than that two domains are entered in textbox it should should a msg that other than gmail and yahoo no other domains are valid how can i do this

What I have tried:

i could not found any souce for implementing this

Posted 27-Apr-17 0:29am

kav@94

Updated 27-Apr-17 0:44am

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Jochen Arndt · Answer 1 · 2017-04-27T00:44:00

Use a regular expression like /.+@(gmail|yahoo)\.com$/

Depending on the used language and the type of the input box the check can be performed in a validation function.

JavaScript example:

JavaScript

function isGmailOrYahoo(mailaddr) {
    var re = /.+@(gmail|yahoo)\.com$/;
    return re.test(mailaddr);
}

[EDIT]

From comment:
i should not use regular exp

Then you can use String.prototype.endsWith() - JavaScript | MDN[^]:

JavaScript

function isGmailOrYahoo(mailaddr) {
    return mailaddr.endsWith('@gmail.com') || mailaddr.endsWith('@yahoo.com');
}

[/EDIT]

[EDIT]
Further reads for ASP.NET control validations:
Types of Validation for ASP.NET Server Controls[^]

In your case you have to use the CustomValidator Class (System.Web.UI.WebControls)[^] when regex is not allowed.

If you want to use client side JavaScript, see Client-Side Validation for ASP.NET Server Controls[^] and Client Side Validation using JavaScript[^].
[/EDIT]