Each time you get a request, you need to write code to check the input and write any errors the user has made back to the page to help the user to correctly fill in the form.
For more information on using client-side Java Script see Using Java Script in Page Flow and Portal Applications.
This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.
The advantages of the latter approach: property must be set to the full name of the action to be called when the user clicks the anchor and submits the form.
This action name corresponds to the web application name followed by the name of the action method in the JPF file, followed by a However, if your application resides in a Portal application, it is recommended that you use get Netui Tag Name(tag Id, this) to retrieve page elements, since Portal containers may rewrite the id attributes of page elements.
Important Validating user input is also important for security.
When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.This happened on firefox but not on chrome, please how to fix this? Why don't you simply add required to your input fields to stop them from being blank? way it'll sort this issue out for you and you don't have the horrible alert message involved at all Here's a solution that should support IE8 , but don't have IE8, so I can't confirm.To see how validation works, run this page and deliberately make mistakes.I'm trying to validate user input by checking if something has been entered into the textbox. What i want to achieve is, a user gets an alert box that a particular field is empty.(11 printed pages) Introduction The Problem The Objective The Solution-Overview Client Features What Is a Validator?