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chartjs-plugin-funnel-label

Plugin for Chart.js to add labels between columns to show the % progress in the same dataset. Chart.js 2.6.0 or above required.

Written by Albert Gonzalez and released under the Unlicense.

See it in action!

Starting

Add the chartjs-plugin-funnel-label.js and use the funnel_labels options to enable the plugin and override the default values.

It works only in bar charts with one dataset and will show the % difference between each bar.

new Chart($("#chart"), {
  type: 'bar',
  data: {
    labels: ["Alpha Value", "Beta Value", "Charlie Value", "Delta Value"],
    datasets: [{
      label: 'First Dataset',
      data: [555, 302, 175, 50],
      backgroundColor: "rgba(75, 192, 192, 1)"
    }]
  },
  options: {
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true
        }
      }],
      xAxes: [{
        barPercentage: 0.3
      }]
    },
    funnel_labels: {
      enabled: true,
      background_color: "red"
    }
  }
});

Current options

They're set in the label_options object with these default values:

label_options: {
  enabled: false,
  font_style: "normal",
  font_family: "Arial",
  font_color: "white",
  background_color: "#FFBA4B",
  rectangle_width_scale_factor: 5,
  show_zeros: true,
  min_width_upper_label: 150,
  allow_upper_label: true,
  force_upper_label: false,
}

rectangle_width_scale_factor

width for each label rectangle = width between two bars / rectangle_width_scale_factor

show_zeros

If true will show the labels with a 0% value (otherwise will hide them).

min_width_upper_label

If the width between two bars is smaller than this value the labels will appear over them.

allow_upper_label

If set to false, the labels over the bars won't appear (it won't draw anything).

force_upper_label

If true will always show the labels over the bars (this will override the allow_upper_label option).

Known issues

  • The plugin can't handle more than one dataset and it just won't draw anything.

About

Plugin for Chart.js to add labels between columns to show the % progress in the same dataset

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