QR Code Generator Using JavaScript

Define QR code as a quick response code, a 2D barcode invented in 1994, storing up to 4000 alphanumeric characters; read by smartphone scanners and generated via Google Chat API.

Harness the Google Chart API to generate a QR code by constructing a URL with required parameters: cht=qr, chs=widthxheight, and chl=data, encoding text like Hello World.

Learn how to generate and encode text into QR codes with JavaScript, including handling a chat API input and setting height and weight within a fixed area.

Create html and javascript files for a qr code generator in Visual Studio Code, generate a html skeleton with the exclamation mark, include javascript inline or external, and preview Chrome.

Learn to create and call a JavaScript function to respond to a button click, using a script tag, function declaration, and the onclick event to display an alert.

Learn to access a text box and a text area using JavaScript by id, retrieve their values, and display them with an alert on a button click.

Learn if-else logic in JavaScript by linking a select tag to show Google, Bing, or Yahoo images, or alert when not available, using DOM manipulation.

Learn to build a QR code generator in JavaScript using the Google Chart API, taking text from a text area and size from a dropdown to render a QR image.

Learn how to host a QR code generator website for free with Blogger, paste the code, and customize icons, styling, and a favicon to polish the site.

Learn how to create a QR code generator using JavaScript and host the site for free. Share your feedback and experience to help improve this course.