Thread: JavaScript for required field not blanked.

Hi. I am developing one windows application. In that application one form is there, in this form some field is there like Username, birth date etc. I want to right JavaScript for user if the users not enter the field then it gives the error message. Kindly help me on how to get rid of this problem.

I suggest you to refer following example of JavaScript, which will give you something idea about the use of this:

Code:

<script language="JavaScript" type="text/javascript">
//You should create the validator only after the definition of the HTML form
 var frmvalidator = new Validator("myform");
 frmvalidator.addValidation("FirstName","req","Please enter your First Name");
 frmvalidator.addValidation("FirstName","maxlen=20",
"Max length for FirstName is 20");
 frmvalidator.addValidation("FirstName","alpha");
 
 frmvalidator.addValidation("LastName","req");
 frmvalidator.addValidation("LastName","maxlen=20");
 </script>

Code:

<script type="text/javascript">
    
        function RegainFocus() 
       {
            if((document.getElementById("txt_name").value).length == “”) 
           {
                document.getElementById("txt_name").focus();
                alert("Please Enter Name");
            }
        }        
    
    </script>

Refer following script:

Code:

function verify() {
var errormess = "Please fill following fields: ";
if (document.form.first.value=="") {
errormess = errormess + " - First Name";
}
if (document.form.last.value=="") {
errormess = errormess + " -  Last Name";
}
if (document.form.email.value=="") {
errormess = errormess + " -  E-mail";
}
//alert if fields are empty and cancel form submit
if (errormess == "You are required to complete the following fields: ") {
document.form.submit();
}
else {
alert(errormess);
return false;
   }
}
//  End -->
</script>

The script that I have mentioned will definitely help you.