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Posted 23 Nov 2011

Validate multiple email id's using javascript

, 23 Nov 2011
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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)


About the Author

Ramanujam Shankar
Web Developer Mahindra Logisoft Business Solution Limited, Chenn
India India
No Biography provided

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Comments and Discussions

GeneralReason for my vote of 5 good hint. Pin
Leonardo Paneque23-Nov-11 18:42
memberLeonardo Paneque23-Nov-11 18:42 
GeneralRe: Thanks a ton Buddy Pin
Ramanujam Shankar9-Feb-12 21:57
memberRamanujam Shankar9-Feb-12 21:57 

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