About Referencing Items Using JavaScript | Oracle APEX
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When you reference an item, the best approach is to reference the item name as it is defined within the page. Note that item name is different than the item label. The item name displays on the Page Definition and the label displays on a running page. For example, if you create an item with the name P1_FIRST_NAME and a label of First Name, you would reference the item using P1_FIRST_NAME.
Referencing an item by the item name enables you to use the JavaScript method getElementById() to get and set item attributes and values. The following example demonstrates how to reference an item by ID and display its value in an alert box.
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