Form validation tweak

I have some code that tests a couiple of things on my form. Now I have added a catpcha field and the value required to pass will always be 4. So, the surfer has to enter 4 into the catpcha field.

How do I modify the following code to do this? The catpcha field is called catpcha.

<script language="JavaScript">

function validate_required(field,alerttxt)
{
with (field)
{
  if (value==null||value==""||value=="Select")
  {
  alert(alerttxt);return false;
  }
  else
  {
  return true;
  }
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate_required(email,"Email must be filled out!")==false)
  {email.focus();return false;}

else if 
(validate_required(country,"Country must be filled out!")==false)
  {country.focus();return false;}
}
}
</script>

Code (markup):

Thanks,

Jon

 

You should always do such kind of validations also on your server side.

<script language="JavaScript">

function validate_required(field,alerttxt)
{
with (field)
{
  if (value==null||value==""||value=="Select")
  {
  alert(alerttxt);return false;
  }
  else
  {
  return true;
  }
}
}

function validate_equals(field,fieldValue,alerttxt)
{
with (field)
{
  if (value==null||value==""||value!= fieldValue)
  {
  alert(alerttxt);return false;
  }
  else
  {
  return true;
  }
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate_required(email,"Email must be filled out!")==false)
  {email.focus();return false;}

else if 
(validate_required(country,"Country must be filled out!")==false)
  {country.focus();return false;}

else if 
(validate_equals(catpcha,4,"Incorrect catpcha value!") == false)
 {catpcha.focus(); return false;}
}
}
</script>

PHP:

 

To validate forms why not use jquery? Its so easy!
check this pretty good tutorial: http://corpocrat.com/2009/07/15/quick-easy-form-validation-tutorial-with-jquery/

 

Serverside validation is essential but having a user friendly prompt before submission is always nice.