Add data.shown API and modify data API interface - #626

c3.js

@@ -6105,9 +6105,14 @@
         return config.regions;
     };
 
-    c3_chart_fn.data = function (targetId) {
-        var targets = this.internal.data.targets.filter(function (t) { return t.id === targetId; });
-        return targets.length > 0 ? targets[0] : null;
+    c3_chart_fn.data = function (targetIds) {
+        var targets = this.internal.data.targets;
+        return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
+            return [].concat(targetIds).indexOf(t.id) >= 0;
+        });
+    };
+    c3_chart_fn.data.shown = function (targetId) {
+        return this.internal.filterTargetsToShow(this.data(targetId));
     };
     c3_chart_fn.data.values = function (targetId) {
         var target = this.data(targetId);

spec/api.data-spec.js

+var describe = window.describe,
+    expect = window.expect,
+    it = window.it,
+    beforeEach = window.beforeEach;
+
+describe('c3 api data', function () {
+    'use strict';
+
+    var chart, d3;
+
+    var args = {
+        data: {
+            columns: [
+                ['data1', 30, 200, 100, 400, 150, 250],
+                ['data2', 50, 20, 10, 40, 15, 25]
+            ]
+        }
+    };
+
+    beforeEach(function (done) {
+        if (typeof chart === 'undefined') {
+            window.initDom();
+        }
+        chart = window.c3.generate(args);
+        d3 = chart.internal.d3;
+        chart.internal.d3.select('.jasmine_html-reporter')
+            .style('position', 'absolute')
+            .style('right', 0);
+
+        window.setTimeout(function () {
+            done();
+        }, 10);
+    });
+
+    describe('data()', function () {
+
+        it('should return all of data if no argument given', function () {
+            var results = chart.data(),
+                expected = ['data1', 'data2'];
+            results.forEach(function (result, i) {
+                expect(result.id).toBe(expected[i]);
+            });
+        });
+
+        it('should return specifid data if string argument given', function () {
+            var results = chart.data('data1');
+            expect(results.length).toBe(1);
+            expect(results[0].id).toBe('data1');
+        });
+
+        it('should return specifid data if array argument given', function () {
+            var results = chart.data(['data1', 'data2']);
+            expect(results.length).toBe(2);
+            expect(results[0].id).toBe('data1');
+            expect(results[1].id).toBe('data2');
+        });
+
+    });
+
+    describe('data.shown()', function () {
+
+        it('should return only shown targets', function () {
+            var results;
+            chart.hide('data1');
+            results = chart.data.shown();
+            expect(results.length).toBe(1);
+            expect(results[0].id).toBe('data2');
+        });
+
+    });
+
+});

src/api.data.js

-c3_chart_fn.data = function (targetId) {
-    var targets = this.internal.data.targets.filter(function (t) { return t.id === targetId; });
-    return targets.length > 0 ? targets[0] : null;
+c3_chart_fn.data = function (targetIds) {
+    var targets = this.internal.data.targets;
+    return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
+        return [].concat(targetIds).indexOf(t.id) >= 0;
+    });
+};
+c3_chart_fn.data.shown = function (targetId) {
+    return this.internal.filterTargetsToShow(this.data(targetId));
 };
 c3_chart_fn.data.values = function (targetId) {
     var target = this.data(targetId);