We introduced Ext.form.ComboBox in Chapter 6,Adding Ext Layout Elements, showing how it can be used as a direct replacement for the HTML Select List. It provides the same drop-down list of values, as well as auto-completing filtering functionality, enabling users to find and select a value quickly.
But that's only scratching the surface of what the ComboBox can do!
In this section, we will cover creating a plug-in ComboBox, enabling functionality for it to do both local and remote loading of data. The ComboBox can use all of the Ext data store classes for its input data, so we will cover using the ArrayStore for local ComboBoxes, and the JsonStore for remote ComboBoxes.
Unlike the new APEX 4.0 Auto-complete item type ...
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