HTML5 Tutorial: Build a Chart with JavaScript and the HTML5 Canvas
The HTML5 canvas is capable of rendering lines, shapes, images, text, and more without relying on a plug-in. Although the canvas element isn't supported by older browsers, the latest version of all major browsers (Internet Explorer, Safari, Chrome, Firefox, and Opera) now support the canvas, making it an option for rendering charts, graphs, and other types of visual data. In cases where a browser doesn't support the canvas, a fallback can be provided that renders data using Silverlight, Flash, or another type of plug-in. The code for the CanvasChart object is located in a file named canvasChart.js that's available with this article's downloadable code. The code starts by defining a CanvasChart object that exposes two members named renderType and render. renderType is used to define what will be rendered on the chart (currently it supports rendering lines and points), while render() is used to render the data on the canvas as well as the associated labels for the x and y axes. The skeleton code for CanvasObject is shown in The render function starts by assigning the dataObj parameter to a variable within the CanvasChart object, then calls an internal function named getMaxDataYValue(). The getMaxDataYValue() function determines the maximum Y value for the data points. From there, the render() function locates the target canvas element within the page, calculates width and height values, and accesses the canvas's 2D context that will be used to draw. Finally, a call is made to renderChart() to start the rendering process.Variable Inside Javascript Flash Code - News
The code follows a JavaScript pattern referred to as the "revealing module pattern," which provides a convenient way to write objects that expose specific members only to outside callers. This example exposes the renderType variable and render function
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JSHint – a JavaScript code quality checker
With the previously mentioned command produces the following errors: demo.js: line 2, col 16, Expected '{' and instead saw 'return'. demo.js: line 3, col 5, 'bar' is not defined. demo.js: line 3, col 16, Missing semicolon. demo.js: line 4, col 5, Line breaking error 'return'. demo.js: line 5, col 5, 'bar' is not defined.
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