javascript - ExtJS 4 get every listeners of an observable object - Stack Overflow

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I've an observable object defined as follows:

Ext.define ('MyObject', {
  mixins: {
    observable: 'Ext.util.Observable'
  } ,
  constructor: function (cfg) {
    this.initConfig (cfg);
    this.mixins.observable.constructor.call (this, cfg);
    ...
  }
});

Then, I create an instance of this object and attach some listeners:

var obj = Ext.create ('MyObject', {...});
obj.on ({
  first: function () {...} ,
  second: function () {...} ,
  third: function () {...} ,
  fourth: function () {...}
});

In the end, I'm gonna destroy the 'obj' instance, but at this point I've to save every listeners previously attached because I'm mad and I need to create another instance of 'MyObject', with the same configuration of 'obj', listeners included.

So, the question is: how can I save every listener of an observable object?

Thank you so much!

I've an observable object defined as follows:

Ext.define ('MyObject', {
  mixins: {
    observable: 'Ext.util.Observable'
  } ,
  constructor: function (cfg) {
    this.initConfig (cfg);
    this.mixins.observable.constructor.call (this, cfg);
    ...
  }
});

Then, I create an instance of this object and attach some listeners:

var obj = Ext.create ('MyObject', {...});
obj.on ({
  first: function () {...} ,
  second: function () {...} ,
  third: function () {...} ,
  fourth: function () {...}
});

In the end, I'm gonna destroy the 'obj' instance, but at this point I've to save every listeners previously attached because I'm mad and I need to create another instance of 'MyObject', with the same configuration of 'obj', listeners included.

So, the question is: how can I save every listener of an observable object?

Thank you so much!

• javascript
• extjs
• observer-pattern
• listeners
• observable

Share Improve this question Follow asked Apr 25, 2013 at 21:45 WilkWilk 8,1431010 gold badges4747 silver badges7171 bronze badges 2

• Why not describe the listeners in the constructor || initComponent of an object? Or I do not understand the question? – Vlad Commented Apr 25, 2013 at 22:27
• Because I don't know which listeners are going to get attached on that object. – Wilk Commented Apr 25, 2013 at 22:34

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 6

You can try create a getListeners() method for your object:

Ext.define ('MyObject', {

    ...

    getListeners: function() {
        var me = this,
            l = {};
        for(var event in me.hasListeners) {
            Ext.each(me.events[event].listeners, function(listener) {
                l[event] = listener.o[event];
            });
        }
        return l;
    }
});

...

var listeners = obj.getListeners();
obj.destroy();

obj2.on(listeners);

See on jsfiddle: http://jsfiddle/8GMsp/

Note: I have not tried to use it in a real application. May be require revision.

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