APEX has long been extensible. It was built in such a way that developers could add custom content to just about any part of a page constructed by the framework. The problem, however, was twofold. First, you had to be familiar with the related technologies to step outside of the declarative environment that APEX provides. Second, even if you had enough knowledge to accomplish a customization, repeating it on another page, or another application altogether, was often quite cumbersome.
KeywordsCustom Attribute Warning Message Event Handler Callback Function Option Object
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