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Onsubmit Event Using Required Field Validate In JavaScript

  1. <HTML>  
  2.   
  3. <HEAD>  
  4.     <TITLE>Validator</TITLE>  
  5.     <SCRIPT type="text/JavaScript"> function checkForm(form) { for (var i = 0; i  
  6.         < form.elements.length; i++) { if (form.elements[i].value=="" ) { alert( "Fill out ALL fields.") return false; } } return true } </SCRIPT>  
  7. </HEAD>  
  8.   
  9. <BODY>  
  10.     <FORM onsubmit="return checkForm(this)"> Please enter all requested information:  
  11.         <BR> First Name:  
  12.         <INPUT TYPE="text" NAME="firstName">  
  13.         <BR> Last Name:  
  14.         <INPUT TYPE="text" NAME="lastName">  
  15.         <BR> Rank:  
  16.         <INPUT TYPE="text" NAME="rank">  
  17.         <BR> Serial Number:  
  18.         <INPUT TYPE="text" NAME="serialNumber">  
  19.         <BR>  
  20.         <INPUT TYPE="submit" value="SUBMIT"> </FORM>  
  21. </BODY>  
  22.   
  23. </HTML>