How to do a self-destroy inside a custom component in Sencha Touch

问题

update:

new code:

Ext.define('Fiddle.MyCmp',{
     extend:'Ext.Component'
    ,alias:'widget.mycmp'
    ,config:{
         html:'MyCmp'
    }
    ,initialize:function() {
        var me = this;
        console.log(me);
        Ext.Function.defer(me.destroy, 5000, me);

        Ext.Function.defer(function(){
            console.log('after 8 seconds');
            console.log(this);

        }, 8000, me);
    }
});

Ext.application({
    name : 'Fiddle',
    ref:{
        cmp: 'mycmp'

    },

    launch : function() {
        Ext.Viewport.add({
            xtype:'mycmp'            
        });


    }
});

Still after 8 seconds, I still can print out the component. Here is the console log:

Class {onInitializedListeners: Array[0], initialConfig: Object, id: "ext-mycmp-1", getUniqueId: function, getId: function…} VM1639:39

after 8 seconds VM1639:43 Class {onInitializedListeners: Array[0], initialConfig: Object, id: "ext-mycmp-1", getUniqueId: function, getId: function…}

---

I am trying to add a self-destroy function in a custom component. But it simply doesn't work.

Here is my code:

Ext.define('NoiseComponent', {
    extend: 'Ext.Component',
    xtype: 'noisestation',
    config: {
        name: null,
        updatedTime: new Date(),
        listeners: {
            destroy: function() {

                console.log("do something before destroy()");
                //thisComponent.destroy();
            },
            updatedata: function(thisComponent, newData, eOpts) {
                var startTime = newData[0].get("NoiseTime");
                this.config.updatedTime = new Date();

            },
            initialize: function(thisComponent, eOpts) {
                console.log("initialize component");

                setTimeout(function() {
                    thisComponent.selfDestory(thisComponent);

                }, 5000);
            }
        }
    },

    drawNoise: function() {

        console.log("drawNoise");
    },
    selfDestory: function(thisComponent) {
        console.log("self-destroy");
        thisComponent.destroy(thisComponent);
    }
});

var c = Ext.create("NoiseComponent");

console.log(c);

c.destroy();
//c.fireEvent('destroy');

console.log("after destroyed");
console.log(c);

setTimeout(function() {
    console.log("after 5s");
    console.log(c);
}, 5000);

Here is the console log I got:

initialize component VM1591:44 Class {onInitializedListeners: Array[0], initialConfig: Object, id: "ext-noisestation-1", getUniqueId: function, getId: function…} VM1591:72 do something before destroy() VM1591:65 after destroyed VM1591:77 Class {onInitializedListeners: Array[0], initialConfig: Object, id: "ext-noisestation-1", getUniqueId: function, getId: function…} VM1591:78 self-destroy VM1591:60 do something before destroy() VM1591:65 after 5s VM1591:81 Class {onInitializedListeners: Array[0], initialConfig: Object, id: "ext-noisestation-1", getUniqueId: function, getId: function…} VM1591:82

Here is my sencha jsfiddle https://fiddle.sencha.com/#fiddle/6cl

回答1:

I suppose you want to destroy the component 5s after it is initialized. If so, the following code does it:

Ext.define('Fiddle.MyCmp',{
     extend:'Ext.Component'
    ,alias:'widget.mycmp'
    ,config:{
         html:'MyCmp'
    }
    ,destroy:function() {
        console.log('destroy override');
        this.callParent(arguments);
    }
    ,initialize:function() {
        var me = this;
        Ext.Function.defer(function(){
            console.log('Destroying after delay')
            me.destroy();
        }, 5000, me);
    }
});

Ext.application({
    name : 'Fiddle',
    ref:{
        cmp: 'mycmp'

    },

    launch : function() {
        Ext.Viewport.add({
            xtype:'mycmp'            
        });        
    }
})

来源：https://stackoverflow.com/questions/24058929/how-to-do-a-self-destroy-inside-a-custom-component-in-sencha-touch