Скачать или смотреть How to Properly Use Underscore.js Debouncer with jQuery's .on() for Window Resize Events

Learn how to efficiently implement an `Underscore.js` debouncer with jQuery's `.on()` and `.off()` methods for optimized window resizing functionality in your web applications.
---
This video is based on the question https://stackoverflow.com/q/62735484/ asked by the user 'Mitchell Andrew Abbott' ( https://stackoverflow.com/u/6283055/ ) and on the answer https://stackoverflow.com/a/62821535/ provided by the user 'factorypolaris' ( https://stackoverflow.com/u/5588077/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: onresize functions with Underscore.js debouncer - .on() and .off() with Window Widths [Enquire.js]

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction

Handling window resize events can sometimes lead to performance issues, especially when we need to calculate values like font sizes based on the viewport width. A common solution involves using a debouncer to limit how often a function can run while a user is resizing the window. In this guide, we'll explore how to effectively use Underscore.js’s debouncer with jQuery to streamline your window resize logic.

The Problem: Inefficient Resize Handling

When developers implement a function to change font sizes based on the window width, they often tie that function to a resize event. However, calling this function on every single resize event can lead to multiple inefficiencies and performance bottlenecks.

For instance, if you're adjusting the font size only when the window width is above 375 pixels, you’ll need to manage turning the resize event listener off when it's below that width. This is where the Underscore.js debouncer becomes helpful; it allows you to limit how often a function is executed.

The Initial Code Snippet

Here’s a typical implementation using jQuery and Underscore.js:

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

This function will adjust the font size any time the window is resized. However, calling scaleVw on every resize event impacts the performance, especially if the resize action is very quick (like resizing the browser window continuously).

The Solution: Implementing the Underscore.js Debouncer

Step 1: Create the Debounced Function Once

One main issue with the initial approach is that a new instance of the debounce function is created on each resize action. Instead, you should create the debounced function once and pass its reference to the on method. This way, the same function is called on subsequent resize events without creating multiple instances.

Here’s how to do it correctly:

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

Key Changes Made

Debounce Creation: The _.debounce method is called once, storing the returned function in myDebouncedFunction.

Function Reference: This single reference is now used in the event listener.

Step 2: Manage the Event Listener

Ensure that you manage the resize event correctly with enquire.js. When the window is resized below 375 pixels, you need to turn off the listener effectively:

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

Conclusion

By properly utilizing the Underscore.js debouncer with jQuery's .on() method, you can significantly enhance performance when dealing with window resize events. This technique minimizes unnecessary computation by ensuring that the resizing logic is only executed at sensible intervals, which can lead to a more fluid user experience.

Incorporate these practices in your web development projects to maintain efficiency and streamline your code!