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Viewing file:     platform.dom.tests.js (8.78 KB)      -rw-r--r--

describe('Platform.dom', function() {

	describe('context acquisition', function() {
		var canvasId = 'chartjs-canvas';

		beforeEach(function() {
			var canvas = document.createElement('canvas');
			canvas.setAttribute('id', canvasId);
			window.document.body.appendChild(canvas);
		});

		afterEach(function() {
			document.getElementById(canvasId).remove();
		});

		// see https://github.com/chartjs/Chart.js/issues/2807
		it('should gracefully handle invalid item', function() {
			var chart = new Chart('foobar');

			expect(chart).not.toBeValidChart();

			chart.destroy();
		});

		it('should accept a DOM element id', function() {
			var canvas = document.getElementById(canvasId);
			var chart = new Chart(canvasId);

			expect(chart).toBeValidChart();
			expect(chart.canvas).toBe(canvas);
			expect(chart.ctx).toBe(canvas.getContext('2d'));

			chart.destroy();
		});

		it('should accept a canvas element', function() {
			var canvas = document.getElementById(canvasId);
			var chart = new Chart(canvas);

			expect(chart).toBeValidChart();
			expect(chart.canvas).toBe(canvas);
			expect(chart.ctx).toBe(canvas.getContext('2d'));

			chart.destroy();
		});

		it('should accept a canvas context2D', function() {
			var canvas = document.getElementById(canvasId);
			var context = canvas.getContext('2d');
			var chart = new Chart(context);

			expect(chart).toBeValidChart();
			expect(chart.canvas).toBe(canvas);
			expect(chart.ctx).toBe(context);

			chart.destroy();
		});

		it('should accept an array containing canvas', function() {
			var canvas = document.getElementById(canvasId);
			var chart = new Chart([canvas]);

			expect(chart).toBeValidChart();
			expect(chart.canvas).toBe(canvas);
			expect(chart.ctx).toBe(canvas.getContext('2d'));

			chart.destroy();
		});

		it('should accept a canvas from an iframe', function(done) {
			var iframe = document.createElement('iframe');
			iframe.onload = function() {
				var doc = iframe.contentDocument;
				doc.body.innerHTML += '<canvas id="chart"></canvas>';
				var canvas = doc.getElementById('chart');
				var chart = new Chart(canvas);

				expect(chart).toBeValidChart();
				expect(chart.canvas).toBe(canvas);
				expect(chart.ctx).toBe(canvas.getContext('2d'));

				chart.destroy();
				canvas.remove();
				iframe.remove();

				done();
			};

			document.body.appendChild(iframe);
		});
	});

	describe('config.options.aspectRatio', function() {
		it('should use default "global" aspect ratio for render and display sizes', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: 'width: 620px'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 620, dh: 310,
				rw: 620, rh: 310,
			});
		});

		it('should use default "chart" aspect ratio for render and display sizes', function() {
			var ratio = Chart.defaults.doughnut.aspectRatio;
			Chart.defaults.doughnut.aspectRatio = 1;

			var chart = acquireChart({
				type: 'doughnut',
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: 'width: 425px'
				}
			});

			Chart.defaults.doughnut.aspectRatio = ratio;

			expect(chart).toBeChartOfSize({
				dw: 425, dh: 425,
				rw: 425, rh: 425,
			});
		});

		it('should use "user" aspect ratio for render and display sizes', function() {
			var chart = acquireChart({
				options: {
					responsive: false,
					aspectRatio: 3
				}
			}, {
				canvas: {
					style: 'width: 405px'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 405, dh: 135,
				rw: 405, rh: 135,
			});
		});

		it('should not apply aspect ratio when height specified', function() {
			var chart = acquireChart({
				options: {
					responsive: false,
					aspectRatio: 3
				}
			}, {
				canvas: {
					style: 'width: 400px; height: 410px'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 400, dh: 410,
				rw: 400, rh: 410,
			});
		});
	});

	describe('config.options.responsive: false', function() {
		it('should use default canvas size for render and display sizes', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: ''
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 300, dh: 150,
				rw: 300, rh: 150,
			});
		});

		it('should use canvas attributes for render and display sizes', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: '',
					width: 305,
					height: 245,
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 305, dh: 245,
				rw: 305, rh: 245,
			});
		});

		it('should use canvas style for render and display sizes (if no attributes)', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: 'width: 345px; height: 125px'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 345, dh: 125,
				rw: 345, rh: 125,
			});
		});

		it('should use attributes for the render size and style for the display size', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: 'width: 345px; height: 125px;',
					width: 165,
					height: 85,
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 345, dh: 125,
				rw: 165, rh: 85,
			});
		});

		// https://github.com/chartjs/Chart.js/issues/3860
		it('should support decimal display width and/or height', function() {
			var chart = acquireChart({
				options: {
					responsive: false
				}
			}, {
				canvas: {
					style: 'width: 345.42px; height: 125.42px;'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 345, dh: 125,
				rw: 345, rh: 125,
			});
		});
	});

	describe('config.options.responsive: true (maintainAspectRatio: true)', function() {
		it('should fill parent width and use aspect ratio to calculate height', function() {
			var chart = acquireChart({
				options: {
					responsive: true,
					maintainAspectRatio: true
				}
			}, {
				canvas: {
					style: 'width: 150px; height: 245px'
				},
				wrapper: {
					style: 'width: 300px; height: 350px'
				}
			});

			expect(chart).toBeChartOfSize({
				dw: 300, dh: 490,
				rw: 300, rh: 490,
			});
		});
	});

	describe('controller.destroy', function() {
		it('should reset context to default values', function() {
			var chart = acquireChart({});
			var context = chart.ctx;

			chart.destroy();

			// https://www.w3.org/TR/2dcontext/#conformance-requirements
			Chart.helpers.each({
				fillStyle: '#000000',
				font: '10px sans-serif',
				lineJoin: 'miter',
				lineCap: 'butt',
				lineWidth: 1,
				miterLimit: 10,
				shadowBlur: 0,
				shadowColor: 'rgba(0, 0, 0, 0)',
				shadowOffsetX: 0,
				shadowOffsetY: 0,
				strokeStyle: '#000000',
				textAlign: 'start',
				textBaseline: 'alphabetic'
			}, function(value, key) {
				expect(context[key]).toBe(value);
			});
		});

		it('should restore canvas initial values', function(done) {
			var chart = acquireChart({
				options: {
					responsive: true,
					maintainAspectRatio: false
				}
			}, {
				canvas: {
					width: 180,
					style: 'width: 512px; height: 480px'
				},
				wrapper: {
					style: 'width: 450px; height: 450px; position: relative'
				}
			});

			var canvas = chart.canvas;
			var wrapper = canvas.parentNode;
			wrapper.style.width = '475px';
			waitForResize(chart, function() {
				expect(chart).toBeChartOfSize({
					dw: 475, dh: 450,
					rw: 475, rh: 450,
				});

				chart.destroy();

				expect(canvas.getAttribute('width')).toBe('180');
				expect(canvas.getAttribute('height')).toBe(null);
				expect(canvas.style.width).toBe('512px');
				expect(canvas.style.height).toBe('480px');
				expect(canvas.style.display).toBe('');

				done();
			});
		});
	});

	describe('event handling', function() {
		it('should notify plugins about events', function() {
			var notifiedEvent;
			var plugin = {
				afterEvent: function(chart, e) {
					notifiedEvent = e;
				}
			};
			var chart = acquireChart({
				type: 'line',
				data: {
					labels: ['A', 'B', 'C', 'D'],
					datasets: [{
						data: [10, 20, 30, 100]
					}]
				},
				options: {
					responsive: true
				},
				plugins: [plugin]
			});

			var node = chart.canvas;
			var rect = node.getBoundingClientRect();
			var clientX = (rect.left + rect.right) / 2;
			var clientY = (rect.top + rect.bottom) / 2;

			var evt = new MouseEvent('click', {
				view: window,
				bubbles: true,
				cancelable: true,
				clientX: clientX,
				clientY: clientY
			});

			// Manually trigger rather than having an async test
			node.dispatchEvent(evt);

			// Check that notifiedEvent is correct
			expect(notifiedEvent).not.toBe(undefined);
			expect(notifiedEvent.native).toBe(evt);

			// Is type correctly translated
			expect(notifiedEvent.type).toBe(evt.type);

			// Relative Position
			expect(notifiedEvent.x).toBeCloseToPixel(chart.width / 2);
			expect(notifiedEvent.y).toBeCloseToPixel(chart.height / 2);
		});
	});
});