javascript - D3 JS条形图，在条形顶部显示y轴标签值

Question

我正在使用 Angular 7 和 D3JS V4 来实现条形图，我需要在条形顶部显示 y 轴标签值，我尝试了多种方案但未能做到，请帮我做所以..提前谢谢。

 //Initialize SVG
    this.svg = d3.select("#bar-chart");

    this.width = +this.svg.attr("width") - this.margin.left - this.margin.right;
    this.height =
      +this.svg.attr("height") - this.margin.top - this.margin.bottom;
    this.g = this.svg
      .append("g")
      .attr(
        "transform",
        "translate(" + this.margin.left + "," + this.margin.top + ")"
      );

    //Initialize Axis
    this.x = d3Scale
      .scaleBand()
      .rangeRound([0, this.width])
      .padding(0.9);
    this.y = d3Scale.scaleLinear().rangeRound([this.height, 0]);
    this.x.domain(this.totalStores.map(d => d.store));
    this.y.domain([0, d3Array.max(this.totalStores.map(d => d.storeCount))]);

    //Draw Axis
    this.g
      .append("g")

      .attr("transform", "translate(0," + this.height + ")")
      .call(d3Axis.axisBottom(this.x));
    this.g
      .append("g")

      .call(d3Axis.axisLeft(this.y).ticks(4))
      .append("text");

    //Draw Bars
    this.g
      .selectAll(".bar")
      .data(this.totalStores)
      .enter()
      .append("rect")
      .attr("class", "bar")
      .attr("x", d => this.x(d.store))
      .attr("y", d => this.y(d.storeCount))
      .attr("width", this.x.bandwidth())
      .attr("height", d => this.height - this.y(d.storeCount));

jsFiddle

Answer 1

只需将 x 和 y 值传递给文本即可

// Get the y axis value on top
this.g
        .selectAll("text.bar")
        .data(this.totalStores)
        .enter()
        .append("text")
        .attr("class", "yAxis-label")
        .attr("text-anchor", "middle")
        .attr("fill", "#70747a")
        .attr("x", d => this.x(d.store))
        .attr("y", d => this.y(d.storeCount) - 5)
        .text(d => d.storeCount);