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zamorinFlag for Malaysia asked on

Simple Javascript validation

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);
  }
JavaScript

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Last Comment
Zvonko

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Zvonko

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ASKER
zamorin

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?

Zvonko

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);
 }

Zvonko

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;
  }


Your help has saved me hundreds of hours of internet surfing.
fblack61
ASKER
zamorin

works fine, thanks again.

Zvonko

You are welcome.