 an input parameter when generating the outputs (html in this case), so we need to also give it a key that we can reference in the getHTML method. &#8220;action_id&#8221; is an optional variable that equals id from either an output or a control element (we&#8217;ll get to controls in the next example). When action_id is defined, a change in the input will result in either an update to the referenced output or a call to the functions connected to the referenced control.</p>
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