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Posted 23 Nov 2011

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Validate multiple email id's using javascript

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4.67/5 (2 votes)
23 Nov 2011CPOL
Entered multiple email id's with comma/semicolon separator in text box to validate using javascript
function validateEmail(field) {
    var regex = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,5}$/;
    return (regex.test(field)) ? true : false;
function validateMultipleEmailsCommaSeparated(emailcntl, seperator) {
    var value = emailcntl.value;
    if (value != '') {
        var result = value.split(seperator);
        for (var i = 0; i < result.length; i++) {
            if (result[i] != '') {
                if (!validateEmail(result[i])) {
                    alert('Please check, `' + result[i] + '` email addresses not valid!');
                    return false;
    return true;

Use javascript in text box lost focus event
Using semicolon separator

<asp:TextBox onblur="validateMultipleEmailsCommaSeparated(this,';');" ID="txtToEmail" Text="" runat="server" /> 


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By
Web Developer Mahindra Logisoft Business Solution Limited, Chenn
India India
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

Comments and Discussions

GeneralReason for my vote of 5 good hint. Pin
Leonardo Paneque23-Nov-11 17:42
Leonardo Paneque23-Nov-11 17:42 
Reason for my vote of 5
good hint.
GeneralRe: Thanks a ton Buddy Pin
Ramanujam Shankar9-Feb-12 20:57
Ramanujam Shankar9-Feb-12 20:57 

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