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    Default AbstractComponent - can I override the onDestroy method?

    AbstractComponent - can I override the onDestroy method?


    Can a subclass override the AbstractComponent.onDestroy method? ... or is this method private and should I override the beforeDestroy method instead?

    Code:
    Ext.define('Ext.AbstractComponent', {
        ...
        /**
         * Invoked before the Component is destroyed.
         *
         * @method
         * @template
         * @protected
         */
        beforeDestroy : Ext.emptyFn,
        ...
        onDestroy : function() {
            ...
        },
        ....
    });

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    Default


    Any subclass can override it but it does a few things that you would need to clean up. I would just do a callParent
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    Default


    Personally I wouldn't hesitate to override onDestroy if I needed to add destruction logic to a custom component. Choosing between onDestroy and beforeDestroy seems to be just a matter of timing.

    Methods with names that sound like events (e.g. onDestroy, afterRender) are to be thought of as 'internal events', intended to be overridden in subclasses. Of course you have to take care to call the overridden method at the appropriate time.

    There are some really old posts that you may find interesting. Here's one from Jack Slocum explaining his use of template methods in ExtJS 1. This principle remains in the current framework:

    http://www.sencha.com/forum/showthre...ll=1#post33312

    Later in the same thread he touches upon why he chose to name some methods after events:

    http://www.sencha.com/forum/showthre...ll=1#post33652

    This blog post from Nige White also touches upon this subject. Most of the post is about writing plugins but if you skim down you'll find he discusses some of the template methods in the framework:

    http://www.sencha.com/blog/advanced-...t-with-ext-js/

    He also explains some of the reasons why overriding methods is more appropriate than listening to events when writing an extension.

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