如何在c3.js折线图中仅突出显示一个数据点？

Question

Using point show as false hides all the data points .
But what to do if I want to hide all but one datapoint.

For Example,

 var chart = c3.generate({ data: { columns: [ ['data1', 30, 200, 100, 400, 150, 250], ['data2', 50, 20, 10, 40, 15, 25] ] } }); 

In the above line chart, how to highlight the data point where value is 100 and hide every other data point?

Answer 1

In C3, those circles have a class named c3-circle . So, using a D3 selection, you can set the opacity based on the bound datum:

var circles = d3.selectAll(".c3-circle")
    .style("opacity", function(d){
        return d.value === 100 ? 1 : 0;
    })

Thus, only the circle corresponding to 100 is visible.

Here is the demo:

 var chart = c3.generate({ data: { columns: [ ['data1', 30, 200, 100, 400, 150, 250], ['data2', 50, 20, 10, 40, 15, 25] ] } }); var circles = d3.selectAll(".c3-circle").style("opacity", function(d){ return d.value === 100 ? 1 : 0; }) 

 <script src="https://d3js.org/d3.v3.min.js"></script> <link rel="stylesheet" type="text/css" href="https://rawgit.com/masayuki0812/c3/master/c3.css"> <script src="https://rawgit.com/masayuki0812/c3/master/c3.js"></script> <div id="chart"></div>