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Validate email id, integer, password, empty field JavaScript Tutorial

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Submitted on: 1/4/2015 7:22:00 AM
By: rajat talwar (from psc cd)  
Level: Intermediate
User Rating: By 5 Users
Compatibility: Java (JDK 1.1)
Views: 2217
 
     You will learn the following from this well commented code: • Validate email id, integer, password, empty field using JavaScript • Keypress, onsubmit, onclick and parameter passing. • To change other combo box’s value as one is changed • To enable/disable control’s • To have two submit button values(action) • Access JavaScript control parameters in the script • Html and JavaScript basics. • Use of meta tag for temporary redirecting message
 

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//**************************************
//HTML for :Validate email id, integer, password, empty fieldJavaScript Tutorial
//**************************************
A JavaScript Validation tutorial
JavaScript is a scripting language which works on the client side to make web pages highly responsive. Because a lot of time is wasted for user to submit the data and then validate the data on the server it is better if restrict the user to enter the correct data on the client side only. Validation works like this:
 An html form generates an event called ‘onSubmit’ whenever it’s submit button is pressed. If we make ‘onSubmit=False’ the page is stopped from being submitted. So to validate a page we call a JavaScript function check() which returns false if form is not filled correctly. We use Demo Html page for our tutorialit is highly commented.
Following are some common validations covered: 
•	To check if entered value is an integer
•	To check if the field is not left empty
•	To check whether email id is valid or not
•	To check if value of fields is of min. length reqd.
•	To check if the passwords match
You will learn the following from this well commented code:
•	Validate email id, integer, password, empty field using JavaScript
•	Keypress, onsubmit, onclick and parameter passing.
•	To change other combo box’s value as one is changed
•	To enable/disable control’s
•	To have two submit button values(action)
•	Access JavaScript control parameters in the script
•	Html and JavaScript basics.
•	Use of meta tag for temporary redirecting message
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