I am struggling to make Angular Charts display labels the way I want them to

Struggling to customize an angular chart for my project. The x axis should display dates and the mouse over should show client names, all retrieved from an array of resource objects in a loop.

The loop code snippet is as follows:

angular.forEach(charts, function(chart, key) {
             var d = new Date(chart.appointment_date).toDateString();

             $scope.labels.push(d);
             $scope.total_earnings += chart.cost.dollars;
               $scope.data[0].push(chart.cost.dollars);
               if (!chart.refundObj[0]){
                 $scope.data[1].push(0);
                } else {
                 $scope.data[1].push((chart.refundObj[0].amount/100));
                }
            });

Currently, the date property is set on both the x axis and in the mouseover. However, when trying to include the client name using:

$scope.labels.push({date: d, name: clientName});

the output only shows [Object, Object].

Using this documentation as the foundation for the charts:

javascriptangularjschartsangular-chart

Answer №1

angular-chart is built on the foundation of Chart.js, which requires an array of strings for labels. If you input an object instead, Chart.js will convert it to a string using toString, resulting in [Object, Object] if toString is not defined.

Creating the desired output is straightforward with the correct object construction and option setting.

HTML

<div ng-app="app">
    <div ng-controller="ctrlr">
        <canvas id="line" class="chart chart-line" data="data"
                labels="labels" options="options"></canvas>
    </div>
</div>

JS

In this example, we define a unique object SpecialLabel that provides the axis label when toString is invoked. We also customize the tooltipTemplate to display tooltipLabel while constructing the tooltip.

var app = angular.module('app', ['chart.js']);

app.controller('ctrlr', ['$scope', function ($scope) {

    var SpecialLabel = function (axisLabel, tooltipLabel) {
        this.axisLabel = axisLabel;
        this.tooltipLabel = tooltipLabel;
    }
    SpecialLabel.prototype.toString = function () {
        return this.axisLabel
    }

    $scope.labels = [
    new SpecialLabel("10-Jan", "Client 1"),
    new SpecialLabel("11-Jan", "Client 2"),
    new SpecialLabel("12-Jan", "Client 3"),
    new SpecialLabel("13-Jan", "Client 4"),
    new SpecialLabel("14-Jan", "Client 5"),
    new SpecialLabel("15-Jan", "Client 6"),
    new SpecialLabel("16-Jan", "Client 7")];

    $scope.data = [
        [65, 59, 80, 81, 56, 55, 40]
    ];

    $scope.options = {
        tooltipTemplate: "<%if (label){%><%=label.tooltipLabel%>: <%}%><%= value %>"
    }
}])

Fiddle - http://jsfiddle.net/xg2pd1cu/

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