如何在不使用“ this”的情况下以角度访问当前组件的变量

Question

This question will sound a bit odd, but I will explain the reason. I am using d3.js combined with Angular. everything is fine, but sometimes there are events within the logic of d3.js in which "this" is a different value from the context of angular. For this reason I would like to know if there is a way to directly access the variables that I have defined in my component in the style of:

HomeComponent.myVar   //HomeComponent name of my current component

Instead of

this.myvar

this is a example of my problem using d3.js

Node.on("mouseout", unfocus);

function unfocus(){
 console.log(this); //problem context angular
}

Node.mouseover(function(d){
 console.log(this); //this is not context angular, is a value of this event
 console.log(HomeComponent.myvar); //not works, but is my idea
 })

thank you.

Answer 1

The comments explain that you can use another syntax to still be able to access this :

Node.mouseover(d => {
    console.log(this);
})

If you really want to keep the other syntax, which I don't recommend, you can store this in another variable:

let self = this;

Node.mouseover(function(d){
    console.log(self);
})

I don't recommend it because it's harder to understand, it's error prone, and it's not always clear what the scope of the variable is.

Answer 2

try placing your variables outside of the class' scope with a var/let/const keyword. you could than try and access the variable without "this"