How to process and display flowcharts in HTML

With the development of information technology, flow charts have become one of the tools frequently used in modern offices. In some projects and reports, flowcharts are used to present business processes using symbols and lines and help readers better understand and track process progress. A good flow chart allows readers to quickly understand information such as a business activity, process, or business plan. How to process and display flowcharts in HTML is also a very important issue for developers or website builders who publish information on the web or develop applications.

Below, we will introduce how to process and display flowcharts in HTML.

1. The main way to display flow charts in HTML

One method is to use graphic tags in HTML, such as the tag. The advantage of this method is that it is simple and does not require the use of additional software or programming knowledge. You can directly use the tag in the html file to point the image path to the specified flow chart. The disadvantage is that it is not conducive to interactivity and personalized presentation, and if you want to make changes in these flowcharts, you need to start from scratch.

Another method is to use the Canvas tag in HTML5, which can make the flowchart more interactive and customizable. The Canvas tag allows you to create images that reference HTML pages and add interactive functionality to specific graphics. This tag can be used in HTML5 to create various types of animations, graphics, and interactive applications.

2. Use the tag to process and display the flowchart

1. Store the flowchart on the server side, such as using pixel-level bitmap image formats such as BMP, JPG or PNG.

2. Insert the tag in the HTML file and point the file path of the flowchart to the saved image.
3. Can provide support for browsers to disable image scaling.

~ Illustration: Display the img tag of the flow chart

3. Use the Canvas tag to process and display the flow chart

1. Install and use support Browser for Canvas and JavaScript. The Canvas object is not supported by all browsers, so make sure your browser supports Canvas.

2. Use the latest Canvas API, which includes fillRect(), strokeRect(), lineTo(), beginPath(), etc.

3. Insert the Canvas tag in HTML and specify the width, height, and ID of the canvas.

4. In JavaScript, use Canvas API and drawing path to Create a flowchart.

let canvas = document.getElementById('flowchart');
let context = canvas.getContext('2d');
context.beginPath();
context.moveTo(100 , 100);
context.lineTo(300, 100);
context.moveTo(150, 150);
context.lineTo(250, 150);
context.moveTo(200, 200 );
context.lineTo(300, 200);
context.stroke();

~ Illustration: Use Canvas tag to display flow chart

4. Summary

Using the tag and the Canvas tag are the two main ways of handling and displaying flowcharts in HTML. Using the tag is the simplest way, but it hinders customization and interactivity. In HTML5, using the Canvas tag allows you to create more interactive flowcharts with greater customization capabilities, but requires the use of slightly more complex JavaScript programming techniques. Ultimately we can choose which approach to use based on our specific needs.

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