How do I draw a vertical line on a horizontal bar chart with ChartJS?

Question

There are many examples of extending a Chart to include a line, both horizontal and vertical. However, I have not found a way to draw a vertical line with a horizontal bar chart.

1. Horizontal line on horizontal line chart
2. Vertical line on horizontal line chart
3. Horizontal line on vertical bar chart

There is not a "vertical line chart" option like there is a "horizontal bar chart" option. How do I combine a horizontal bar chart with a vertical line?

Chart.js documentation

The result would have a bar dataset and a line dataset that can be used on the same chart using the same axis like below:

Answer 1

ChartJS supports custom plugins. Create a plug in that will read a new property from the chart options and draw the line at the specified index.

See it on Plunkr

  //Create the plug in var originalLineDraw = Chart.controllers.horizontalBar.prototype.draw; Chart.helpers.extend(Chart.controllers.horizontalBar.prototype, { draw: function () { originalLineDraw.apply(this, arguments); var chart = this.chart; var ctx = chart.chart.ctx; var index = chart.config.options.lineAtIndex; if (index) { var xaxis = chart.scales['x-axis-0']; var yaxis = chart.scales['y-axis-0']; var x1 = xaxis.getPixelForValue(index); var y1 = yaxis.top; var x2 = xaxis.getPixelForValue(index); var y2 = yaxis.bottom; ctx.save(); ctx.beginPath(); ctx.moveTo(x1, y1); ctx.strokeStyle = 'red'; ctx.lineTo(x2, y2); ctx.stroke(); ctx.restore(); } } }); //Set up the chart data var data = { labels: ["January", "February", "March", "April", "May", "June", "July"], datasets: [ { label: "My First dataset", backgroundColor: [ 'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)' ], borderColor: [ 'rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1, data: [65, 59, 80, 81, 56, 55, 40], } ] }; //Load Chart var ctx = $("#myChart"); var myBarChart = new Chart(ctx, { type: 'horizontalBar', data: data, options: { //Set the index of the value where you want to draw the line lineAtIndex: 60, legend: { display: false } } }); 

  <canvas id="myChart"></canvas> <script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> <script src='https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.2/Chart.min.js'></script> <script src="horizontalBarPlugin.js"></script> <script src="buildChart.js"></script> 

Answer 2

Have you tried this? It's a horizontal line with vertical bar charts - so the opposite of you case. But maybe you can derive something useful out of it:

var chart = c3.generate({
 bindto: '#chartContainer',
 tooltip: {
        grouped: false 
    }, 
data: {

    columns: [

        ['data1', 30, 200, 100, 400, 150, 250],
        ['data2', 130, 340, 200, 500, 250, 350],
        ['data3', 30, 200, 100, 400, 150, 250],
        ['data4', 130, 340, 200, 500, 250, 350],
        ['data5', 130, 340, 200, 500, 250, 350],
        ['data6', 130, 340, 200, 500, 250, 350],
        ['data7', 130, 340, 200, 500, 250, 350],
        ['diif1', null, null, 700 ],
        ['diif2', null, null, 1200]
    ],
    types:{
     "data1" :"bar",
        "data2" :"bar",
        "data3" :"bar",
        "data4" :"bar",
        "data5" :"bar",
        "data6" :"bar",
        "data7" :"bar",
         "diff1" : "line",
        "diff2" : "line"

  },
     order:null,
    groups: [
        ['data1', 'data2','data3', 'data4'],
        ['data5', 'data6','data7']
    ],
     onclick: function (d, element) { 
         var name=d.name;
         drilldown(name);
     }

},
   grid: {
       y: {
        lines:[{value:1400,text:1400}, 
              {value: 1450,text: 1450}
             ]
         }
    } 
});


function drilldown(name){
 alert('Call for ' +name);   
}

http://jsfiddle.net/9nxcfzb9/12/

I'm looking for something similar to you but not with horizontal bar charts, but timespan bars, if you've got an idea, please let me know: How do I change or add the vertical line on a tooltip of a c3 graph?