Validate E-Mail

This JavaScript verifies that a string looks like a real e-mail address.... detail at JavaScriptBank.com - 2.000+ free JavaScript codes

Demo: JavaScript Validate E-Mail
​

How to setup

Step 1: Use JavaScript code below to setup the script
JavaScript

Code:

<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 [email protected]
  
  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
	-->

Step 2: Place HTML below in your BODY section
HTML

Code:

<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
	-->

Command to print web page in javascript - Javascript Time Picker - JavaScript Go To URL Box​

 

Dude, where did you learn this crap?

Code:

<SCRIPT LANGUAGE="JavaScript"><!--
 var re = new RegExp("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$");
 var email = document.form.email.value;
  if (email.match(re)) {
    alert("Successful match");
  } else {
    alert("No match");
  }
// -->
</SCRIPT>

I also recommend you check out the real valid chars. ~ or ^ are not allowed by email address standards.
Most email providers list invalid characters as "! # $ % * / ? | ^ { } ` ~"

 

^He is just reposting shit from a website.

 

I know. But the script is crap.
Just providing a better alternative, while expressing some anger at, what is probably, a bot.

 

LOL! Very funny backlinking there, funniest still is why would you use JavaScript for validation that should be done back-end, as JavaScript could simply be disabled and voila! Infinite random emails used.

 

lol, I would also going to ask why he just doesn't use a regular expression and save himself a page worth of writing.