> Ok clear :)
>
> Thanks!
>
> Best regards,
>
> Peter
>
> On 22 jun 2012, at 16:16, asgallant wrote:
>
>> It depends. If you add an event listener inside a 'ready' event listener
>> for the dashboard, then every time the dashboard fires a 'ready' event,
>> another instance of the event listener will be created. Sometimes this is
>> ok, sometimes you don't want this at all. There is no one "best" way.
>>
>> Usually, the only thing that causes a dashboard to fire a 'ready' event is
>> when you call the draw method. When this happens, all existing dashboard
>> elements are destroyed (I assume cleanly) by the API and redrawn. Any event
>> handlers you had put in place on the charts or controls themselves (ie,
>> chart or control objects, not ChartWrappers or ControlWrappers) are
>> destroyed along with the elements, and thus would need to be recreated.
>>
>> If there is anything you don't want to instantiate a second time, you can
>> destroy the 'ready' event listener:
>>
>> var readyListener = google.visualization.events.addListener(dash, 'ready',
>> function () {
>> // do some stuff
>> // then destroy this event listener
>> google.visualization.events.removeListener(readyListener);
>> });
>>
>> You can create multiple 'ready' event listeners for the dashboard, to
>> separate out things you only want to instantiate once and things that need
>> to be reinstantiated when the dashboard is redrawn.
>> On Friday, June 22, 2012 4:49:23 AM UTC-4, Peetzer wrote:
>> Sometimes after ready event of dashboard, select or other listeners can only
>> be used on other controls.
>>
>> Should the google.visualization.events.addListener be called only once on a
>> control or is this handled internally (getKey()) ?
>>
>> In other words, is the same listener is not added multiple times when
>> calling google.visualization.events.addListener again?
>>
>> Should the listeners always be removed (removeListener) on unload to prevent
>> memory leakage?
>>
>> Regards Peter
>>
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