When developers talk about customizing Oracle Application Express applications, they usually mean server-side rather than client-side customizations - for example, directing users to a specific page based on a value submitted from a form. Oracle Application Express (formerly Oracle HTML DB) does provide many powerful features for customizing applications, but Oracle Application Express applications, like any other Web applications, can benefit from the appropriate use of client-side JavaScript to perform tasks such as conditionally rendering entry fields and validating data. This paper walks through the process of customizing a simple Oracle Application Express form, to demonstrate using JavaScript to accomplish several design goals best suited for client-side code.
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