javascript - Angular 2 D3 拖动功能范围问题

Question

我正在使用 d3.js v4.4 和 Angular 2。

我有一些可拖动山墙的气泡，并且拖动效果很好。如果访问拖动到 x 和 y，我现在需要做什么，使用这些值来计算组件上的数据集的值。我遇到的问题是我的拖动结束函数，它指的是拖动的对象，我无法访问实际的父范围。

这就是我添加气泡的方式。

showPeopleBubble() {
        let self = this;
        console.log('run')
        this.bubblePeople = this.canvas.selectAll('.bubblePeople')
            .data(this.nodes)
            .enter().append('g')
            .attr('class','.bubblePeople').attr('id',function(d){return 'i'+d.index})
            .attr('transform',"translate(100,100)")
            .call(D3['drag']().on("start", self.dragstarted)
                .on("drag", self.dragged)
                .on("end", self.dragended));

            this.bubblePeople.append("title").text(function(d){return d.name + ' ('+d.index+')'})

            this.bubblePeople.append('circle')
                .attr('r',30)
                .attr('fill','blue')
                .attr('fill-opacity',.3)
                .attr("text-anchor","middle")

            this.bubblePeople.append('text').text(function(d){return d.name.substring(0,30/3)});

    }

dragended(d) {
   // this in here is the bubble that i'm dragging
//i need to access the parent level.


}

Answer 1

您可以像这样手动使用回调:

showPeopleBubble() {
        let self = this;
        console.log('run')
        this.bubblePeople = this.canvas.selectAll('.bubblePeople')
            .data(this.nodes)
            .enter().append('g')
            .attr('class','.bubblePeople').attr('id',function(d){return 'i'+d.index})
            .attr('transform',"translate(100,100)")
            .call(D3['drag']().on("start", self.dragstarted)
                .on("drag", self.dragged)
                .on("end", function(d){
                    return self.dragended(d, this, self);
                 }));

            this.bubblePeople.append("title").text(function(d){return d.name + ' ('+d.index+')'})

            this.bubblePeople.append('circle')
                .attr('r',30)
                .attr('fill','blue')
                .attr('fill-opacity',.3)
                .attr("text-anchor","middle")

            this.bubblePeople.append('text').text(function(d){return d.name.substring(0,30/3)});

    }

dragended(d, innerThis, globalThis) {
   // this in here is the bubble that i'm dragging
//i need to access the parent level.
  //  globalThis.someFunction();  <-- will call the global someFunction() method

}

someFunction(){}

我还将函数 this 放在了全局范围内的 dragished(d) 函数中，这样您就不会丢失它。