validate numeric entry

[satyasampan]

i need to validate the form .. fields should not be empty is justified... but the last field i.e var z should be numeric ..please reply fast

function validateform()
  {
  var x=document.getElementById("nameid").value;
  if(x==''){alert("name should not be empty");return false;}
 var y=document.getElementById("qualificationid").value;
  if(y==''){alert("qualification should not be empty");return false;}
 var z=document.getElementById("rollnumid").value;
  if(z==''){alert("rollnum should not be empty");return false;}
}

[ariful alam]

As your question, it is related to JavaScript. So, it's better to post any question in the proper area here.

by the way...

The solution is:

if(isNaN(z)){
   alert("Please, enter a number");
}

hope works for you. :)

[satyasampan]

hi ariful... am not getting any alert... please attach ur answer to my code so that i can undersatnd it clearly...thank u for advice

[ariful alam]

Here is a full code:

<script language='javascript' type='text/javascript'>
 
function validate(){
    if(document.getElementById('name').value==""){
        alert('name field is empty.');
        document.getElementById('name').focus();
    }else if(document.getElementById('qulf').value==""){
        alert('qualification field is empty.');
        document.getElementById('qulf').focus();
    }else if(document.getElementById('roll').value=="" || isNaN(document.getElementById('roll').value)){
        alert('roll number field is empty or not a number.');
        document.getElementById('roll').focus();
    }else{
        alert('validation successful!');
    }
}
 
</script>
 
 
<label>User Name: <input type='text' size='30' id='name' placeholder='please, enter your name.' /></label>
<label>Qualification: <input type='text' size='30' id='qulf' placeholder='please, enter your qualification.' /></label>
<label>Roll Number: <input type='text' size='30' id='roll' placeholder='please, enter your age.' /></label>
<input type='button' id='save' value='validate' onclick='javascript:validate();'/>

Hope works for you. :)