将简单的条形图变成分组条形图 (D3)

Question

I have two data columns in my csv file named "profit" and "revenue". Currently, I am displaying only "profit" as a Simple Bar Chart. However, I wish to group the other column of data ie "revenue" along with "profit" and turn it into a Grouped Bar Chart.

Here is my csv data:

month,revenue,profit
January,123432,80342
February,19342,10342
March,17443,15423
April,26342,18432
May,34213,29434
June,50321,45343
July,54273,80002

And here is my code on Plunker:

https://plnkr.co/edit/rmGGbNwg4mEGLrXT?preview

I would appreciate it if somebody could help me with this. Thanks in advance!

Answer 1

Ok, this is a crude answer, but will allow you to further develop what you want. You just need to play with the bar widths in order to accommodate two bars per month. https://plnkr.co/edit/K9LVNpFPmXFIGufM?preview

        const rects = g.selectAll("rect.profit")
            .data(data)

        rects.exit().remove()

        rects
            .attr("y", d => y(d.profit))
            .attr("x", (d) => x(d.month))
            .attr("width", 0.5 * x.bandwidth())
            .attr("height", d => HEIGHT - y(d.profit))

        rects.enter().append("rect")
            .attr("class", "profit")
            .attr("y", d => y(d.profit))
            .attr("x", (d) => x(d.month))
            .attr("width", 0.5 * x.bandwidth())
            .attr("height", d => HEIGHT - y(d.profit))
            .attr("fill", "grey")

        const rects_revenue = g.selectAll("rect.revenue")
            .data(data)

        rects_revenue.exit().remove()

        rects_revenue
            .attr("y", d => y(d.revenue))
            .attr("x", (d) => x(d.month))
            .attr("width", 0.5 * x.bandwidth())
            .attr("height", d => HEIGHT - y(d.revenue))

        rects_revenue.enter().append("rect")
            .attr("class", "revenue")
            .style("fill", "red")
            .attr("y", d => y(d.revenue))
            .attr("x", (d) => x(d.month) + 0.5 * x.bandwidth())
            .attr("width", 0.5 * x.bandwidth())
            .attr("height", d => HEIGHT - y(d.revenue))
            .attr("fill", "grey")