Tips for customizing the appearance of a tooltip in an NVD3 Chart

Exploring the NVD3 framework and attempting to enhance a customized tooltip for a specific pie chart given below:

var app = angular.module('plunker', ['nvd3']);

app.controller('MainCtrl', function($scope) {
  $scope.options = {
        chart: {
            type: 'pieChart',
            height: 500,
            x: function(d){return d.key;},
            y: function(d){return d.y;},
            color:['#CE1B1F', '#FFC455', '#00A6CD'],
            showLabels: false,
            duration: 500,
            labelThreshold: 0.01,
            labelSunbeamLayout: true,
            legend: {
                margin: {
                    top: 5,
                    right: 35,
                    bottom: 5,
                    left: 0
                }
            }
        }
    };

    $scope.data = [
        {
            key: "A",
            y: 2
        },
        {
            key: "B",
            y: 1
        },
        {
            key: "C",
            y: 3
        },
    ];
});

Considering methods to personalize the tooltip to match a desired style, based on Krispo's sample on [github][1]. Any suggestions on how to achieve this?

javascriptangularjsd3.jsnvd3.js

Answer №1

To implement a custom tool-tip feature, you must include the tooltip in the existing nvd3 options as shown below:

tooltip: {
     contentGenerator: function (e) {
           //Create and return customized tool-tip as HTML using e.series and e.data
     }
}

If you require additional values or attributes for each series, you can define them within $scope.data like this:

$scope.data = [
        {
            key: "CAT I",
            y: 2,
            MyAttribute1:"DLA Avn ... CAT I",
            MyAttribute2:"DLA Energy ... CAT I"
        },
        {
            key: "CAT II",
            y: 3,
            MyAttribute1:"DLA Avn ... CAT II",
            MyAttribute2:"DLA Energy ... CAT II"
        },
        {
            key: "CAT III",
            y: 1,
            MyAttribute1:"DLA Avn ... CAT III",
            MyAttribute2:"DLA Energy ... CAT III"
        },
    ];

Now, you can access these custom values within the tool-tip function using e.data like so:

tooltip: {
         contentGenerator: function (e) {
              var series = e.series[0];
              if (series.value === null) return;

              var rows = 
                "<tr>" +
                  "<td class='key'>" + series.key + '- #3: ' + "</td>" +
                  "<td class='x-value'>" + e.data.MyAttribute1 + "</td>" + 
                "</tr>" +
                "<tr>" +
                  "<td class='key'>" + series.key + '- #5: ' + "</td>" +
                  "<td class='x-value'>" + e.data.MyAttribute2 + "</td>" + 
                "</tr>";

              var header = 
                "<thead>" + 
                  "<tr>" +
                    "<td class='legend-color-guide'><div style='background-color: " + series.color + ";'></div></td>" +
                    "<td class='key'><strong>" + series.key + "</strong></td>" +
                  "</tr>" + 
                "</thead>";

              return "<table>" +
                  header +
                  "<tbody>" + 
                    rows + 
                  "</tbody>" +
                "</table>";
            } 
}

You can view an updated version on this Edited Plunker to see how it is implemented.

I hope this explanation clarifies any doubts.

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