vaidate email address in a javascirpt form

Hello All,

I have made the following form. But i want to be able to validate the email address so that it must have a @ and not include / \ " etc

Any ideas?

Code:

---

<script type="text/javascript">
 function CheckForm() {
  tbName=document.forms[0].name.value;
  if (tbName == '') {
  alert('Name is required.');
  return false;
  }

  tbaddress=document.forms[0].address1.value;
  if (tbaddress == '') {
  alert('Address Line 1 is required.');
  return false;
  }
  tbaddress2=document.forms[0].address2.value;
  if (tbaddress == '') {
  alert('Address Line 2 is required.');
  return false;
  }
  tbcity=document.forms[0].city.value;
  if (tbcity == '') {
  alert('City is required.');
  return false;
  }


  tbpostcode=document.forms[0].postcode.value;
  if (tbpostcode == '') {
  alert('Post Code is required.');
  return false;
  }
 
  tbemail=document.forms[0].emailaddress.value;
  if (tbemail == '') {
  alert('Email is required.');
  return false;
  }

  return true;
  }
</script>

<form onsubmit="return CheckForm();">
  <p>
  <label for="Name">Name:*</label> 
  <input type="text" name="name" size="50" /> 
  <br>
  <label for="address1">Address Line 1:*</label>
  <input type="text" name="address1" size="50" />
  <br>
  <label for="address2">Address Line 2:*</label> 
  <input type="text" name="address2" size="50" />
  <br>
  <label for="City">City:*</label>
 
  <input type="text" name="City" size="50" />
  <br>
  <label for="County">County:*</label>
    <input type="text" name="County" size="50" />
  <br>
  <label for="zip">Post Code:*</label>
  <input type="text" name="postcode" />
  <br> 
  <label for="email">Email Address:*</label> 
  <input type="text" name="emailaddress" size="50" />
  <br>

  <label>Can we use your email address for marketing:</label>
  <br />
  <input type="checkbox" name=Yes value="Yes" checked />
  <span>Yes</span>
  <input type="checkbox" name=No value="No"/>
  <span>No</span>
 <br />

<input type="submit">
</form>

---

they say using of Search sometimes can help

Hi

I have got the code but i am just unsure where to put it.. I have tried in various places but it doesn't work !

if (!(/^([a-z0-9])([\w\.\-\+])+([a-z0-9])\@((\w)([\w\-]?)+\.)+([a-z]{2,4})$/i.test(email.value))) {

Any ideas?

if(!(/^([a-z0-9])([\w\.\-\+])+([a-z0-9])\@((\w)([\w\-]?)+\.)+([a-z]{2,4})$/i.test(email.value))){return false;}

if the given email.value matches that regular expression, the re.test(string) function returns true. so we can translate the above code string into human language approximately as: "if(not true){stop sending the form}"

The principle is to test the address with a regular expression like this (to update your code) :

Code:

---

 
var tbemail=document.forms[0].emailaddress.value;
  if (tbemail == '') {alert('Email is required.'); return false;}

var rgx=/@/;// the simpler test with only an @
if (! rgx.test(themail)) {alert('Email address seems not valid !'); return false;}

---

I write seems not valid while it's very difficult to test an email address (See for example this page to validate a RFC 2822 email address). Read this page for further developments...
The best test to validate an address is to send an email with a validation link valid for 12 or 24 hours.