form validation

[robertvan]

I have a script that validates blank fields, and improper entrys. I want to validate a couple of the fields (middle_initial,fax_number)for improper data, however it would be ok for them to leave it blank.

 

Thanks

[trq]

And your question is?

[jitesh]

I do not get you.

[robertvan]

Sorry about the confusion,

 

I want to write a script that will alow blank fields, but not alow improper data. On the form I will ask for a fax number. If they leave it blank that will be okay and will still process. If they were to type in something like fdgfdg into the fax feild it would produce an error message. I will also ask for there name on the form, and I want to check for both blank and improper data, so if they do not type there name into the form or they type 44444 into the form for the name entry it will show an error message. My question is " HOW DO I DO THIS".

 

Thank You

[jitesh]

This may give you idea

 

<script language=javascript>

fucntion check(){

if((trim(document.formname.fax.value) != "") and !isnumber(document.formname.fax.value)){

        alert('Invalid fax no');

        return false;

}

 

}

function trim()

{

if (this.length > 0)

{

var retstr = this.replace(/^\s+/,"");

retstr = retstr.replace(/\s+$/,"");

return retstr;

}

else return this;

}

 

function isnumber(val){

var realNoRegEx = /^([0123456789]+$/i;

if (!realNoRegEx.test(val))

return false;

return true;

}

</script>

[Fergusfer]

Here's an idea for PHP:

 

<?php

// $input is a string representing some form input you want to validate

if ($input != '') {
  // validation
}

// use $input as you see fit

?>