In other words, in order to validate a field, you just associate a set of validation descriptors for each input field in the form. For such cases, a function is included which clears all validations in the validator object. Note that this validation if for fields like Textbox and multi-line text box.
For ‘selections’ like drop down and radio group, use an appropriate validation like ‘dontselect’ or ‘selone_radio’.
Using client side Java Script is an efficient way to validate the user input in web forms.
When there are many fields in the form, the Java Script validation becomes too complex.
For example, you may want to ensure that someone inserts a valid e-mail address into a text box, or perhaps you want to ensure that someone fills in certain fields.
Microsoft® Office Front Page® 2003 allows you to create some custom validation within the form feature.
The following code shows the implementation of this validate() function.
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.This validation descriptor is valid only for drop down lists.The drop down select list boxes usually will have one item saying ‘Select One’ (and that item will be selected by default).The Java Script class presented here makes the form validations many times easier.The script has a catalog of almost all the common validation types built-in.