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Simple Javascript validation

Posted on 2004-03-28
6
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Last Modified: 2006-11-17
How do I code javascript, that can validate whether the visitor fills in the regsistration number and if he does, then it should be 7 digits in length. My current code is as follows, but it doesn't work.


if (theForm.regNo.value == "" && theForm.regNo.value.length < 7)
  {
    alert("Please enter your valid Registration Number.");
    theForm.regNo.focus();
    return (false);
  }
0
Comment
Question by:zamorin
  • 4
  • 2
6 Comments
 
LVL 63

Accepted Solution

by:
Zvonko earned 50 total points
ID: 10702078
Like this:

  if (theForm.regNo.value.length != 7){
    alert("Please enter your valid Registration Number.");
    theForm.regNo.focus();
    return (false);
 }

0
 
LVL 5

Author Comment

by:zamorin
ID: 10702122
That is not  accurate as it doesn't allow 'no registration number'. The proper one is as follows:

  if (!theForm.regNo.value == "" && theForm.regNo.value.length < 7)
  {
     alert("Please enter your valid Registration Number.");
     theForm.regNo.focus();
     return (false);
  }

Points for you. Thanks!

PS: Do you have any simple email validation script that checks for '@' and '.' in their email field?

0
 
LVL 63

Expert Comment

by:Zvonko
ID: 10702175
Let me first finish this:

if (theForm.regNo.value != "" && theForm.regNo.value.length != 7){
   alert("Please enter your valid Registration Number.");
   theForm.regNo.focus();
   return (false);
 }

0
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LVL 63

Expert Comment

by:Zvonko
ID: 10702191
And for email check this:

  if(!theForm.EmailAddress.value.match(/^\w+([\.\-]\w+)*\@\w+([\-\.]\w+)*\.[a-z]{2,4}$/i)){
    alert("Wrong email: "+theForm.EmailAddress.value);
    theForm.EmailAddress.select();
    theForm.EmailAddress.focus();
    return false;
  }


0
 
LVL 5

Author Comment

by:zamorin
ID: 10702346
works fine, thanks again.

0
 
LVL 63

Expert Comment

by:Zvonko
ID: 10702402
You are welcome.
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