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Print - Validate E-Mail - JavaScriptBank.com

Full version: jsB@nk » Email » Validate E-Mail
URL: http://www.javascriptbank.com/validate-e-mail.html

Validate E-Mail © JavaScriptBank.comThis JavaScript verifies that a string looks like a real e-mail address.

Full version: jsB@nk » Email » Validate E-Mail
URL: http://www.javascriptbank.com/validate-e-mail.html



JavaScript
<script language="javascript">// Created by: Francis Cocharrua :: http://scripts.franciscocharrua.com/function Validate_String(string, return_invalid_chars) {  valid_chars = '1234567890-_.^~abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';  invalid_chars = '';  if(string == null || string == '')     return(true);  //For every character on the string.     for(index = 0; index < string.length; index++) {    char = string.substr(index, 1);                                 //Is it a valid character?    if(valid_chars.indexOf(char) == -1) {      //If not, is it already on the list of invalid characters?      if(invalid_chars.indexOf(char) == -1) {        //If it's not, add it.        if(invalid_chars == '')          invalid_chars += char;        else          invalid_chars += ', ' + char;      }    }  }              //If the string does not contain invalid characters, the function will return true.  //If it does, it will either return false or a list of the invalid characters used  //in the string, depending on the value of the second parameter.  if(return_invalid_chars == true && invalid_chars != '') {    last_comma = invalid_chars.lastIndexOf(',');    if(last_comma != -1)      invalid_chars = invalid_chars.substr(0, $last_comma) +       ' and ' + invalid_chars.substr(last_comma + 1, invalid_chars.length);    return(invalid_chars);    }  else    return(invalid_chars == ''); }function Validate_Email_Address(email_address){  // Modified and tested by Thai Cao Phong, JavaScriptBank.com  //Assumes that valid email addresses consist of user_name@domain.tld    at = email_address.indexOf('@');  dot = email_address.indexOf('.');  if(at == -1 ||     dot == -1 ||     dot <= at + 1 ||    dot == 0 ||     dot == email_address.length - 1)  {  alert("Invalid email");    return(false);  }       user_name = email_address.substr(0, at);  domain_name = email_address.substr(at + 1, email_address.length);                    if(Validate_String(user_name) === false || Validate_String(domain_name) === false)  {  alert("Invalid email");    return(false);  }  alert("Valid email");//return(true);}</script><!--    This script downloaded from www.JavaScriptBank.com    Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->


HTML
<form name=f><input type=text name=mail value=""><input type=button value=Check onclick="Validate_Email_Address(document.f.mail.value)"></form><!--    This script downloaded from www.JavaScriptBank.com    Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->