Скачать или смотреть How to Effectively Change a p Element's innerText in p5.js

Discover how to change the `innerText` of a ` p ` element in p5.js scripts with ease. Learn the correct approach with step-by-step guidance!
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This video is based on the question https://stackoverflow.com/q/74981017/ asked by the user 'Astudent' ( https://stackoverflow.com/u/10552885/ ) and on the answer https://stackoverflow.com/a/74981073/ provided by the user 'White Wizard' ( https://stackoverflow.com/u/9366059/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Changing a <p> Element's innerText in p5.js

If you’re working with p5.js and trying to modify the text of a <p> element after it's created, you might find yourself facing an unexpected challenge. This guide will guide you through the process of changing the innerText of a <p> element in your p5.js scripts efficiently. Let’s break it down step-by-step!

The Challenge: Changing Inner Text

Suppose you have a simple p5.js sketch that creates a paragraph, and later on, you want to update the text displayed in that paragraph. You might be tempted to try something like this:

[[See Video to Reveal this Text or Code Snippet]]

However, as you've discovered, this approach doesn’t work. The innerText of a DOM element cannot be changed this way within the draw() function. So what should you do? Let's explore the solution.

The Solution: Correctly Updating Text

Step 1: Declare the Variable Globally

To access myP in both the setup() and draw() functions, you need to declare the variable outside of those functions. This way, it's globally accessible throughout your script.

Step 2: Use .html() Method

Instead of using innerText, you should utilize the .html() method provided by p5.js for <p> elements. This method is specifically designed to set the inner HTML content of an element, allowing for easy text modification.

A Refactored Example

Here’s how to correctly implement this in your code:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By following the instructions above, you can easily change the text of a <p> element in your p5.js sketches. Here’s a quick recap:

Declare your variable outside of the setup() function for global access.

Use the .html() method instead of manipulating the innerText directly.

Final Thoughts

Understanding how to manipulate DOM elements in p5.js is crucial for creating dynamic sketches. By managing the scope of your variables and using the right methods, you can have full control over your elements. Happy coding!