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In this way, client side form validation can vastly improve the user experience.

This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.

This document specifies a syntax created by subsetting an existing, widely used international text processing standard (Standard Generalized Markup Language, ISO 8886(E) as amended and corrected) for use on the World Wide Web.

It is a product of the XML Core Working Group as part of the XML Activity. As a convenience to readers, it incorporates the changes dictated by the accumulated errata (available at to the Fourth Edition of XML 1.0, dated 16 August 2006.

- Dollar Sign - You can display the item with the dollar-sign, but your end-user may strip it off when entering data, and you would need to write transformation rules to ensure consistency.

- Enforcing numeric format - You must validate that your currency item is in your desired form, with the dollar sign and decimal point in the right places.

All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.

Its goal is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML.

In this example, we are going to validate the name and password.

The name can’t be empty and password can’t be less than 6 characters long. The user will not be forwarded to the next page until given values are correct.

(Note: APEX does not have a numeric datatype for screen items, and all screen items start as text fields.) I chose to omit the display of the dollar sign to make it easier on my end-user, and I defined the column with a maximum width of 5 characters, and used the APEX currency format mask: Upon screen item display, a visual header reminds the end-user that the value is expressed in dollars: Now I must enforce the 99.99 format on the screen.

Below I go into the APEX item validation wizard and specify a regular expression for the 99.99 format as "/d/d./d/d": Upon testing, APEX catches the formatting error and displays a help error message to the end-user: In sum, this is just one of many ways to enforce numeric and currency screen item values in APEX.

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XML has been designed for ease of implementation and for interoperability with both SGML and HTML.

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