d3 - 悬停在图例上突出显示相应的数据 [英] d3 - hover on legend to highlight the respective data

问题描述

使用d3成功创建了一个热图。

Successfully created a heatmap using d3.

这里是 FIDDLE 。

我有一些关于使用d3的 mouseover 事件。但现在我想向前迈进一步。

I have some basic idea on using d3's mouseover events. But now I wanted move a step ahead.

这是我要找的。当我在一个传说中徘徊时，我希望图表中突出显示悬浮图例的相应数据。

This is what I'm looking for. When I hover on a legend, I wanted the hovered legend's respective data to be highlighted in the chart.

有人可以帮助我实现它吗？

Can someone help me to achieve it?

推荐答案

您没有将数据绑定到图例，这使得这个任务更困难，但你仍然可以很容易地做。这个想法是将由填充颜色定义的类分配给 rect 元素，然后在鼠标悬停处理程序中相应地选择。

You're not binding the data to the legend, which makes this task a bit more difficult, but you can still do it fairly easily. The idea is to assign a class defined by the fill color to the rect elements and then select accordingly in the mouseover handler. The code looks like this.

// for the rectangles
.attr("class", function(d) {  
  return "hour bordered " + "color-" + colorScale(d.value).substring(1);
})

// for the legend
.on("mouseover", function(d, i) {
  svg.selectAll("rect.color-" + colors[i].substring(1)).style("stroke", "blue");
})
.on("mouseout", function(d, i) {
  svg.selectAll("rect.color-" + colors[i].substring(1)).style("stroke", "white");
});

完成示例这里。

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