Checking Elements on a Form : Form HTML « Form Control « JavaScript DHTML

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JavaScript DHTML » Form Control » Form HTML 
Checking Elements on a Form
 

<html>
<head>
<title>Online Registration</title>
<SCRIPT LANGUAGE="JavaScript">
<!--
     function checkFields() {
          var num = document.form1.elements.length
          var validFlag = true
          for (var i=0; i<num; i++) {
               if ((document.form1.elements[i].value == null || document.form1.elements[i].value == ""&&
                  (typeof document.form1.elements[i!= 'submit' || typeof document.form1.elements[i!= 'reset')){
                    validFlag = false;
                    alert("The " + document.form1.elements[i].name + " field is blank.")
                    break ;
               }
          }
          return validFlag;
     }
// -->
</SCRIPT>
</head>
   
<body>
<form name="form1" method="POST" onSubmit="return checkFields()">
<p>Username:<br>
    <input type=text size=25 maxlength=256 name="Username">
    <br>
    Email address:
    <strong><br></strong>
    <input type=text size=25 maxlength=256 name="EmailAddress"></p>
    <input type=submit value="Register"
    <input type=reset value="Clear">
</form>

</body>
</html>

           
         
  
Related examples in the same category
1. Adjusting a CGI Submission Action
2. Button Objects: Submit, Reset, and Button
3. Submitting Forms to the Server
4. Variables in Hidden form
5. Creating an Example Form for User Feedback
6. Accessing the Elements of a Form
7. Using the form.elements Array
8. form.reset() and form.submit() Methods
9. The onReset and onSubmit Event Handlers
10.  Passing a Form Object and Form Element to Functions
11.  Last-Minute Checking Before Form Submission
12. A Form for Entering a URL
13. Storing the last value using a Hidden object.
14. Methods and Properties of the Submit Object
15. Methods and Properties of the Reset Object
16. Properties of the Hidden Object
17. Methods and Properties of the Form Object
18. Client-Side JavaScript Objects and HTML Tags That Create Instances of Them
19. Using the document.forms Property
20. Use hidden field to store data
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