Chartjs-ChartJs – set background color of the space between ticks

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You need to adapt the example you based yourself on to use the height instead of the width.

I simply changed the properties and the coordinates to draw the rectangles and it works.

http://jsfiddle.net/e7oy6yk6/170/

    Chart.pluginService.register({
      beforeDraw: function(chart, easing) {
        if (chart.config.options.chartArea && chart.config.options.chartArea.backgroundColor) {
          var helpers = Chart.helpers;
          var ctx = chart.chart.ctx;
          var chartArea = chart.chartArea;

          var values = chart.data.datasets[0].data; // Added
          // var columnCount = chart.data.datasets[0].data.length;
          var rowCount = Math.ceil(Math.max.apply(null, values) / 10); // Replace by the number of rows you need

          var width = chartArea.right - chartArea.left;
          var height = chartArea.bottom - chartArea.top

          // var columnWidth = width/columnCount;
          var rowHeight = height / rowCount; // Added
          ctx.save();
          ctx.fillStyle = chart.config.options.chartArea.backgroundColor;
          var startPoint = chartArea.top // Changed
          while (startPoint < chartArea.bottom) { // Changed
            ctx.fillRect(chartArea.left, startPoint, width, rowHeight); // Changed order
            startPoint += rowHeight * 2; // Changed
          }
          ctx.restore();
        }
      }
    });

    var config = {
      type: 'line',
      data: {
        labels: ["January", "February", "March", "April", "May", "June", "July"],
        datasets: [{
          label: "My First dataset",
          data: [65, 0, 80, 81, 56, 85, 40],
          fill: false
        }]
      },
      options: {
        chartArea: {
          backgroundColor: 'rgba(251, 85, 85, 0.4)'
        }
      }
    };

    var ctx = document.getElementById("myChart").getContext("2d");
    new Chart(ctx, config);

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