Anular5-“此”在ready（）中无法正常工作 [英] Anular5 - "this" not working within ready()

问题描述

我有一个graph.component.ts

I have a graph.component.ts

this.cContainer = cytoscape ( {  
    ready: function(e) { 
      this._dataService.setResultData();
    }
  });

但我得到
错误TypeError：无法读取属性'setResultData 'of undefined

.. so this 似乎是未知的，看起来是正确的因为我在回调中，所以 称为就绪回调。

..so this seems to be unknown, which looks correct because I am within a callback and so this is referred to the ready-callback.

但是我怎么从这个 ready（）内部调用 _dataService.setResultData（） -callback？

but how would I call _dataService.setResultData() from inside this ready()-callback?

推荐答案

使用箭头功能从捕获此声明上下文。对于函数 ，这由调用者确定，可能不是您的课程：

Use an arrow function to capture this from the declaring context. For function this is determined by the caller and will probably not be your class:

this.cContainer = cytoscape ( {  
    ready: (e) => { 
      this._dataService.setResultData();
    }
  });

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