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JavaScript Tutorial - Index
JavaScript Tutorial - Introduction to JavaScript
JavaScript Tutorial - Basic JavaScript Concepts
JavaScript Tutorial - Working with Operators and Variables
JavaScript Tutorial - How to work with Loops and Functions?
JavaScript Tutorial - How to work with Forms and Events?
JavaScript Tutorial - How to work with Objects?
JavaScript Tutorial - How to work with Browsers and Cookies?
JavaScript Tutorial - More about Objects
JavaScript Tutorial - How to validate Forms with JavaScript?
JavaScript Tutorial - Advanced Techniques in JavaScript

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  Home > Courses, Tutorials & eBooks > JavaScript Tutorial > More about Objects

JavaScript Tutorial - More about Objects

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function mod10( cardNumber )
           var clen = new Array( cardNumber.length );
           var n = 0,sum = 0;
           for( n = 0; n < cardNumber.length; ++n )
                      clen [n] = parseInt ( cardNumber.charAt(n) );
          for( n = clen.length -2; n >= 0; n-=2 )
                      clen [n] *= 2;
          if( clen [n] > 9 )
                      clen [n]-=9;
for( n = 0; n < clen.length; ++n )
          sum += clen [n];
return(((sum%10)==0)?true : false);



In this chapter you have learnt:

  • Adding interaction in a web page using the form object.
  • Accessing properties and methods of the form object.
  • How to check that no fields remain empty.
  • Validating an email form.
  • Validating if a credit card number is valid or not.


Review Questions

Fill in the Blanks

  1. The ------- object allows you to access elements of a form.
  2. -------- and -------- are two methods of Form object.
  3. Form is a property of ----------- object.
  4. --------- property specifes the number of elements defined in the form.


  1. Form
  2. Reset and Submit
  3. Document
  4. Length
  1. Empty-fields validation, check whether an Id and Password are filled out or not.
  2. Check whether a valid email id has been submitted or not; E-mail validation.


  1. View Code         View Runtime
  2. View Code         View Runtime



What's Next

The next chapter will acquaint you with the advanced techniques in JavaScript, which includes Image map and Timing events. The chapter will further elucidate about the usage of area object to implement image map.
                  Hop over to the next chapter to get the close-up of image map and timing events.        



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