Fix data type when no data - #580

c3.js

@@ -3092,11 +3092,19 @@
     };
     c3_chart_internal_fn.hasType = function (type, targets) {
         var $$ = this, types = $$.config.data_types, has = false;
-        (targets || $$.data.targets).forEach(function (t) {
-            if ((types[t.id] && types[t.id].indexOf(type) >= 0) || (!(t.id in types) && type === 'line')) {
+        targets = targets || $$.data.targets;
+        if (targets.length) {
+            targets.forEach(function (target) {
+                var t = types[target.id];
+                if ((t && t.indexOf(type) >= 0) || (!t && type === 'line')) {
                     has = true;
                 }
             });
+        } else {
+            Object.keys(types).forEach(function (id) {
+                if (types[id] === type) { has = true; }
+            });
+        }
         return has;
     };
     c3_chart_internal_fn.hasArcType = function (targets) {

spec/type-spec.js

+var describe = window.describe,
+    expect = window.expect,
+    it = window.it,
+    beforeEach = window.beforeEach;
+
+describe('c3 chart types', function () {
+    'use strict';
+
+    var chart, d3;
+
+    var args = {
+        data: {
+            columns: [
+                ['data1', 30, 200, 100, 400, 150, 250],
+                ['data2', 50, 20, 10, 40, 15, 25],
+                ['data3', 150, 120, 110, 140, 115, 125]
+            ],
+            type: 'pie'
+        }
+    };
+
+    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('display', 'none');
+
+        window.setTimeout(function () {
+            done();
+        }, 10);
+    });
+
+    describe('internal.hasArcType', function () {
+
+        it('should return true', function () {
+            expect(chart.internal.hasArcType()).toBeTruthy();
+        });
+
+        it('should change chart type to "bar" successfully', function () {
+            args.data.type = 'bar';
+            expect(true).toBeTruthy();
+        });
+
+        it('should return false', function () {
+            expect(chart.internal.hasArcType()).toBeFalsy();
+        });
+
+    });
+
+    describe('internal.hasType', function () {
+
+        it('should change chart type to "pie" successfully', function () {
+            args.data.type = 'pie';
+            expect(true).toBeTruthy();
+        });
+
+        it('should return true for "pie" type', function () {
+            expect(chart.internal.hasType('pie')).toBeTruthy();
+        });
+
+        it('should return false for "line" type', function () {
+            expect(chart.internal.hasType('line')).toBeFalsy();
+        });
+
+        it('should return false for "bar" type', function () {
+            expect(chart.internal.hasType('bar')).toBeFalsy();
+        });
+
+        it('should unload successfully', function () {
+            chart.unload([]);
+            expect(true).toBeTruthy();
+        });
+
+        it('should return true for "pie" type even if no data', function () {
+            expect(chart.internal.hasType('pie')).toBeTruthy();
+        });
+
+        it('should return false for "line" type even if no data', function () {
+            expect(chart.internal.hasType('line')).toBeFalsy();
+        });
+
+        it('should return false for "bar" type even if no data', function () {
+            expect(chart.internal.hasType('bar')).toBeFalsy();
+        });
+
+        it('should change chart type to "bar" successfully', function () {
+            args.data.type = 'bar';
+            expect(true).toBeTruthy();
+        });
+
+        it('should return false for "pie" type even if no data', function () {
+            expect(chart.internal.hasType('pie')).toBeFalsy();
+        });
+
+        it('should return false for "line" type even if no data', function () {
+            expect(chart.internal.hasType('line')).toBeFalsy();
+        });
+
+        it('should return true for "bar" type even if no data', function () {
+            expect(chart.internal.hasType('bar')).toBeTruthy();
+        });
+
+
+    });
+
+});

src/type.js

@@ -10,11 +10,19 @@ c3_chart_internal_fn.setTargetType = function (targetIds, type) {
 };
 c3_chart_internal_fn.hasType = function (type, targets) {
     var $$ = this, types = $$.config.data_types, has = false;
-    (targets || $$.data.targets).forEach(function (t) {
-        if ((types[t.id] && types[t.id].indexOf(type) >= 0) || (!(t.id in types) && type === 'line')) {
+    targets = targets || $$.data.targets;
+    if (targets.length) {
+        targets.forEach(function (target) {
+            var t = types[target.id];
+            if ((t && t.indexOf(type) >= 0) || (!t && type === 'line')) {
                 has = true;
             }
         });
+    } else {
+        Object.keys(types).forEach(function (id) {
+            if (types[id] === type) { has = true; }
+        });
+    }
     return has;
 };
 c3_chart_internal_fn.hasArcType = function (targets) {