Скачать или смотреть How to Dynamically Fetch Multiple Documents for Zip Download in JavaScript

Learn how to dynamically handle multiple document downloads using JavaScript and client-zip, enhancing user experience in your applications.
---
This video is based on the question https://stackoverflow.com/q/69642749/ asked by the user 'loliki' ( https://stackoverflow.com/u/4862280/ ) and on the answer https://stackoverflow.com/a/69643127/ provided by the user 'Jeremy Thille' ( https://stackoverflow.com/u/1021703/ ) 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: Client zip multiple fetch

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.
---
How to Dynamically Fetch Multiple Documents for Zip Download in JavaScript

When developing web applications, user experience is crucial, especially when it comes to downloading documents. One common scenario is allowing users to select multiple documents and download them as a zipped file. If you’re working with JavaScript and using libraries like client-zip, you might encounter challenges when attempting to fetch multiple files. In this guide, we’ll tackle this problem by showing you how to handle dynamic fetch requests based on user selections.

The Problem

Imagine a scenario where your application enables users to select various documents from a list to download. Your goal is to compress these selected documents into a single zip file when the user clicks the "Download" button. Although this works smoothly with a single document, dynamically handling multiple documents can become somewhat tricky. Given that the number of documents can be as high as 200, efficiently fetching and zipping them is crucial for maintaining a smooth user experience.

Here’s the original code snippet that our user had created to initiate this process:

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

As you may have noticed, this code is only fetching the first document, which limits its functionality significantly. But don’t worry, there’s a solution to dynamically fetch multiple documents!

The Solution

To enhance our download functionality, we can create an array of Promises from the fetch requests for each document. Here's a step-by-step breakdown of how to implement this:

Step 1: Creating an Array of Promises

Instead of fetching just one document, we can use JavaScript's map function to create an array of promises for each document in allDownloads. Here’s how to do that:

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

Step 2: Awaiting All Promises

Next, we need to wait for all the fetch requests to complete. This is where Promise.all() comes into play. It will take our array of fetch promises and return a single promise that resolves when all of the promises have resolved:

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

Step 3: Zipping and Downloading the Files

After we have all the documents fetched, it’s time to create the zip file and download it. Here’s how to combine everything into a cohesive function:

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

Conclusion

With this updated approach, you can now dynamically fetch multiple documents based on user selections and compress them into a zip file before downloading. By leveraging promises and asynchronous functions, we enhance the application's efficiency and overall user experience. Now, your users can seamlessly select and download multiple documents without any hitches!

Implementing these optimizations not only makes your application more functional but also significantly improves user satisfaction. Happy coding, and enjoy providing a richer experience for your users!