Ember-C3

Ember component library for C3, a D3-based reusable chart library.

See the demo here

Ember Versions

Ember 2.18 and above

Compatibility

• Ember.js v3.4 or above
• Ember CLI v2.13 or above
• Node.js v8 or above

Installation

ember install ember-c3

Usage

Component usage and properties are below. The code for these example charts and more is in the dummy app source code.

The dummy app has been rewritten using native classes, decorators and Ember features available in Ember 3.12. If you want to see the same examples using the Ember object model and classic syntax look at the dummy app in an earlier version.

Combination

Timeseries

Gauge	Pie	Donut

Basic

Where this.model is your C3 data and chart options:

<C3Chart @data={{this.model}} />

Note: Angle brackets were available in Ember 3.4 but a bug prevented the use of numbers in component names until Ember 3.8. Ember-C3 can use angle brackets only with Ember 3.8 and later . Reference PR #17552.

Using classic invocation:

{{c3-chart data=model}}

Advanced

See http://c3js.org/examples.html for examples of how to use C3.

Component Properties

The properties match the corresponding C3 options found in the C3 Documentation. As documented, most C3 settings (i.e. bar, axis, size, etc) can be included in the data object.

The component properties break out the settings to simplify chart configuration. Note: The chart type must be assigned in the chart data object.

Properties marked with an asterisk (*) will update the chart when the property changes. See examples in the dummy app.

dtitle

The dtitle property is used to dynamically change a chart's title. C3 doesn't natively support this without forcing a chart redraw which can cause side effects. This is especially true if the graph data is being dynamically changed using C3's API.

The title can be set using the .c3-title class but that doesn't provide abstraction from C3's internals.

dtitle gives you some control over side effects using a parameter to control how the graph is refreshed. An object with the new title and a refresh parameter is used to indicate whether all properties should be refreshed or only the chart title.

Setting refresh to false will only refresh the title and ignore changes to the data, colors and axis properties. A short example is below. See the drill down example to see how dttile is used and potential side effects.

The chart's initial title is set using the title parameter.

<C3Chart @data={{this.graphData}} @title={{this.title}} @dtitle={{this.dtitle}} />

<button {{on "click" this.changeTitle}}>Change Title</button>

import Controller from "@ember/controller";
import { computed } from "@ember/object";
import { action } from "@ember/object";

export default class ApplicationController extends Controller {
 
  title = { text: "Coffee Brewing" };

  @computed
  get graphData() {
    return {
      columns: [
        ["Cold Brewed", 12],
        ["Drip", 67],
        ["French Press", 14],
        ["Iced", 38],
        ["Percolated", 64]
      ],
      type: "pie"
    };
  }

  @action
  changeTitle() {
    this.set("dtitle", { text: "Making coffee!", refresh: false });
  }
}

C3 Methods

If you assign a controller property to the c3chart property, you can use most of C3's api methods. Not all the methods have been tested.

{{!-- templates/application.hbs --}}
<C3Chart @data={{this.baseData}} @c3chart={{this.chart}} />

<button {{on "click" this.loadUS}}>US Cars</button>
<button {{on "click" this.loadGerman}}>German Cars</button>
<button {{on "click" this.resetData}}>Reset</button>

// controllers/application.js
import { action } from "@ember/object";
import Controller from "@ember/controller";

export default class ApplicationController extends Controller {
  chart = null;

  baseData = {
    columns: [
      ["US", 64],
      ["German", 36]
    ],
    type: "donut"
  };

  modelsGerman = [
    ["Mercedes", 12],
    ["Volkswagon", 54],
    ["BMW", 34]
  ];

  modelsUS = [
    ["Ford", 35],
    ["Chevy", 26],
    ["Tesla", 2],
    ["Buick", 10],
    ["Dodge", 27]
  ];

  @action
  resetData() {
    this.chart.load(this.baseData);
    this.chart.unload([
      "Mercedes",
      "Volkswagon",
      "BMW",
      "Ford",
      "Chevy",
      "Tesla",
      "Buick",
      "Dodge"
    ]);
  }

  @action
  loadUS() {
    this.chart.load({ columns: this.modelsUS });
    this.chart.unload("US", "German");
  }

  @action
  loadGerman() {
    this.chart.load({ columns: this.modelsGerman });
    this.chart.unload("US", "German");
  }
}

C3 Events

C3 emits two types of events - chart and data events. Chart events properties are assigned a closure action. Data events must be assigned an action in the data object.

The following C3 chart events are supported by ember-c3.

For convenience, the chart object is passed to the trigger handler. The chart is not passed to oninit because it hasn't been created yet. An example chart with data events is shown below. Note that bind is required for tying actions to data events. This example uses native classes. See the dummy app for more examples.

{{!-- templates/application.hbs --}}
<C3Chart
  @data={{this.data}}
  @oninit={{action this.setup}}
/>

// controllers/application.js
import Controller from "@ember/controller";
import { computed } from "@ember/object";
import { bind } from "@ember/runloop";

export default class ApplicationController extends Controller {

  @computed
  get data() {
    // iris data from R
    return {
      columns: [
        ["data1", 30],
        ["data2", 120],
        ["data3", 10],
        ["data4", 45],
        ["data5", 90]
      ],
      type: "pie",
      // bind is required for data events
      onclick: bind(this, this.onClick)
    };
  }

  // oninit chart event
  setup() {
    console.log("chart inited")
  }

  // data event - triggered when data point clicked
  onClick(d, i) {
    alert(`Data ${d.name} has a value of ${d.value}`)
  }
}

Accessing D3

You can use the D3 library in your application by importing it where needed

import d3 from "d3";

See the D3 example in the dummy app.

Helpful Links

• Extending ember-c3 charts using base-component approach

See the Contributing guide for details.

License

This project is licensed under the MIT License.