I need to modify the this.bar property within my class when a click event occurs. The issue is that the context of this inside the click function is different from the this of the class.
export class Chart {
constructor() {
this.bar;
}
showChart() {
...
let group = svg.selectAll('g').data(data).enter().append('g');
group.append('rect')
.on('click', function(d) {
// My goal here is to set `this.bar = d`
});
}
}
To refer to the current object inside a function, you can assign it to a variable before entering the function block:
export class Chart {
constructor() {
this.bar;
}
showChart() {
...
let self = this;
let group = svg.selectAll('g').data(data).enter().append('g');
group.append('rect')
.on('click', function(d) {
self.bar=d;
});
}
}
It's important to establish the context of this within the showChart() function:
export class Chart {
constructor() {
this.bar;
}
showChart() {
...
var th = this; // This is where you set it
let group = svg.selectAll('g').data(data).enter().append('g');
group.append('rect')
.on('click', function(d) {
th.bar = d;
});
}
}
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