Validating input in javascript

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This is true for almost any language and almost any case; you should protect your My SQL code from sql-injections, your php input fields from scripts, your javascript from infinite loops, your java code from non-fitting variable type.

expects an integer, next Double expects a double, next Float expects a float and next Line expects a string.

Microsoft® Office Front Page® 2003 allows you to create some custom validation within the form feature.

(For more information on how to create form validation using the Front Page form feature, see About creating forms in Front Page 2003.) However, if the form validation provided in Front Page does not suit your needs or the site on which you are working is hosted on a server that does not have Front Page Server Extensions from Microsoft installed, you may need to create custom form validation.

If the conversion was successful, the method returns the result in the correct type.With the exception of strings, if a user inputs the wrong type, the code will produce an exception and (if not handled correctly) will stop.The purpose of this code is to produce a consistent method to validate user input, and not let the program proceed until the user has inputted a correct type.This message will repeat itself each time the loop requests for the input.Anthony Moore Microsoft Corporation July 2000 Updated March 2002 Summary: Provides a brief overview of the validation framework in ASP.Server-side validation incorporates code validation into a form handler. NET application on the server that provides the functionality that your form needs for processing after a customer has submitted it.

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