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JavaScript from Beginner to Professional

You're reading from   JavaScript from Beginner to Professional Learn JavaScript quickly by building fun, interactive, and dynamic web apps, games, and pages

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Product type Paperback
Published in Dec 2021
Publisher Packt
ISBN-13 9781800562523
Length 546 pages
Edition 1st Edition
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Authors (4):
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Codestars By Rob Percival Codestars By Rob Percival
Author Profile Icon Codestars By Rob Percival
Codestars By Rob Percival
Laurence Svekis Laurence Svekis
Author Profile Icon Laurence Svekis
Laurence Svekis
Maaike van Putten Maaike van Putten
Author Profile Icon Maaike van Putten
Maaike van Putten
Rob Percival Rob Percival
Author Profile Icon Rob Percival
Rob Percival
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Toc

Table of Contents (19) Chapters Close

Preface 1. Getting Started with JavaScript FREE CHAPTER 2. JavaScript Essentials 3. JavaScript Multiple Values 4. Logic Statements 5. Loops 6. Functions 7. Classes 8. Built-In JavaScript Methods 9. The Document Object Model 10. Dynamic Element Manipulation Using the DOM 11. Interactive Content and Event Listeners 12. Intermediate JavaScript 13. Concurrency 14. HTML5, Canvas, and JavaScript 15. Next Steps 16. Other Books You May Enjoy
17. Index
Appendix – Practice Exercise, Project, and Self-Check Quiz Answers

Saving dynamic images

We can convert the canvas to an image, and this image can then be saved as a next step. In order to convert it to an image, we need to add the following to our script element:

let dataURL = canvas.toDataURL();
document.getElementById("imageId").src = dataURL;

We are changing our canvas to a data URL, which then becomes the source of our image. We want this to happen whenever a save button gets clicked. Here is the button:

<input type="button" id="save" value="save" />

And the event listener:

document.getElementById("save").addEventListener("click", function () {
  let dataURL = canvas.toDataURL();
  document.getElementById("holder").src = dataURL;
});

Now whenever the save button gets clicked, it is going to update the image with the generated data URL from the canvas. Whatever content is within the canvas element will be turned into a base64 data image value...

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