How to make Google's "Report issue" feedback form

Do you want to make your own feedback form with screenshot taking & screenshot editing functionality?

Google's feedback form:

Let's make one just like Google's

---

Luckily for you, there's a library built already for this purpose. Introducing, FeedbackPlus.

ColonelParrot / feedbackplus

Screenshotting and screenshot editing for your feedback forms with JavaScript.

FeedbackPlus is an open source Javascript library that allows you to add screenshot taking & screenshot editing functionality to your feedback forms

Available for use by cdn or via npm

The project is inspired by Google's report an issue widget, which allows you to take & edit screenshots. Under the hood, it uses the browser display API and fallbacks to html2canvas if available (see here)

Preview (try it out!)

Taking a Screenshot	Editing screenshot

(click images to enlarge)

Quickstart

For more detailed instructions, see the documentation

Import

npm:

npm i feedbackplus

cdn:

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/gh/ColonelParrot/feedbackplus@master/src/feedbackplus.min.css"
/>
<script
  src="https://cdn.jsdelivr.net/gh/ColonelParrot/feedbackplus@master/src/feedbackplus.min.js"
  defer
></script>
<!-- html2canvas import is optionally, but provides better browser support -->
<script
  src="https://cdn.jsdelivr.net/npm/html2canvas@1.4.1/dist/html2canvas.min.js"
  defer
></script>

const feedbackPlus = new FeedbackPlus();

Capture Screenshot

^...and…

View on GitHub

With FeedbackPlus, you can capture screenshots without having to worry about browser support. The library uses the browser's display API to ensure the screenshot is accurate, and fallbacks to html2canvas for better browser support.

Screenshotting

// import FeedbackPlus from 'feedbackplus/src/feedbackplus'
// ^^^ if you're using node ^^^
const feedbackPlus = new FeedbackPlus();

feedbackPlus.capture().then(result => ...)

You can then very quickly just draw the result to a canvas:

const canvas = document.getElementById("canvas")
feedbackPlus.capture().then(({ bitmap, width, height }) => {
  canvas.width = width;
  canvas.height = height;
  canvas.getContext("2d").drawImage(bitmap, 0, 0);
});

Screenshot Example

<canvas id="canvas"></canvas>
<button id="btn">Take screenshot</button>

const canvas = document.getElementById("canvas")
btn.addEventListener('click', () => {
  feedbackPlus.capture().then(({ bitmap, width, height }) => {
    canvas.width = width;
    canvas.height = height;
    canvas.getContext("2d").drawImage(bitmap, 0, 0);
  })
})

Editing Screenshot

Once you have obtained the image bitmap from a screenshot, you can store it in a variable and pass it to showEditDialog to edit it.

feedbackPlus.showEditDialog(bitmap, function (canvas) {
    // user completed edit
    FeedbackPlus.canvasToBitmap(canvas).then(({ bitmap }) => {
      canvas.getContext("2d").drawImage(bitmap, 0, 0);
      feedbackPlus.closeEditDialog();
    });
  }, function () {
    // user cancelled edit
    feedbackPlus.closeEditDialog();
  }
);

It's that easy! Try it out yourself with the demo.