Source Code



Form Validation Function

  • anonymous
  • Oct 30' 13
  • Javascript
  • 307
  • 73
  • United States

Not Empty Field

This function check if a field has been left empty. If the field is blank, an alert box alerts a message, the function returns false, and the form will not be submitted to action page:

function validfield()
{
var x=document.forms["myForm"]["fieldcheck"].value;
if (x==null || x=="")
  {
  alert("Field must be filled out");
  return false;
  }
}

and you call the function when event submitted

<form action="target_page.php" method="post" name="myForm" 
onsubmit="return validfield()">
Field to check : <input type="text" name="fieldcheck" />
<input type="submit" value="Submit" />
</form>


and will be shown

 

field check image

 

Happy try

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