ExtJS - 如何保留“this”类对象？

Question

my code in a Controller class of ExtJs looks like this below.

1. How do I pass the this object to other functions without using global variables, since I will use multiple instances of my app.

2. If it can only be done globally, how can I isolate my global variables (only for one instance)?

I use ExtJs 4.1 and DeftJs

Thanks!

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Edit:

I want to replace oMeasurements with this in all places !

 init: function() { oMeasurements = this; this.readConfig(); }, readConfig: function() { oMeasurements.httpApi.request({ module : 'monitor', func : 'getConfig', success: oMeasurements.readConfigCallback }); }, readConfigCallback: function(oResponse) { taskMeasurements = { run: oMeasurements.output, interval: '1000' ,scope: this } Ext.TaskManager.start(taskMeasurements); }, output: function() { // finally here, "this" is no more my original "this" console.log(this); oMeasurements.httpApi.request({ module : 'monitor', func : 'getMeasurementsFiles', success: oMeasurements.outputCallback }); } 

Answer 1

You need to add scope: this after callback definition. You're losing scope not because you're calling function from another function, but because you're using callbacks.

Answer 2

Usually there is a scope parameter in Ext function calls with callbacks.

You can also set "this" of a function using Ext.bind();

For example, if you passed a function a() to a another method and ran it, "this" would be the callee. If you called Ext.bind(a, this), when passing "a", "this" would refer to the caller.