Zip and download files javascript

Active 1 month ago. Viewed 30k times. When downloaded, zip all the files into one archive with a JavaScript library eg. Prompt the user to save the zip with SaveAs dialog. I'm stuck at passage 2 , how can I zip the downloaded files? Improve this question. Simon Adcock 3, 3 3 gold badges 23 23 silver badges 41 41 bronze badges. As I read the question, you want to zip all images and provide one zip as a download, right?

If you want an example, feel free to look in the source code of my Chrome extension source viewer extension. I see that you've attempted to copy the code from my extension without understanding it, is that correct? If so, read the documentation for zip. In my extension, I'm downloading a zip-compatible file, and immediately presenting it as a download.

That's not OK in your case, because you're downloading a image, and want to zip it. I've just found another question which seems exactly in line with your original and new question: stackoverflow. I know, I already read that answer, but in that case, if the files are downloaded internally by the zip library and not with xhr request in my code , how can I obtain informations on download progress to notify the user in case the files take some minutes to be downloaded?

Whatever your use case, know that Zip files can be read and generated without any need for a server! Canvas provides the means for incredible and efficient animations with the added bonus of no Flash; these developers can flash their awesome JavaScript skills instead. Here are nine unbelievable canvas demos that I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like , what software I use, and oftentimes Hey everyone!

Before we get started, I just want to say it's damn hard to pick this few favorites on CodePen. But because there is just so The idea of image preloading has been around since the dawn of the internet. When we didn't have all the fancy stuff we use now, we were forced to use ugly mouseover images to show dynamism. Using Promise. Your code will send a thousand requests at once.

There are many problems with that approach:. The solution I thought about is to divide the files into multiple groups. Instead of starting to download them all at once by Promise. After finishing those 5, I will start another pack. To implement this, we can do a custom logic.

Or a simpler way I could suggest is to utilize third-party library bluebirdjs. The library implemented many helpful promise functions. For this use case, I will use Promise. Notice that Promise here now is the custom Promise provided by the library, not the built-in Promise.

Then you will download a zip file called download. You would do something like this where files could be an array of fetch Responses for example, though there are many supported inputs :. For that you have to follow the steps below.

You can download sample code from my git repository here GIT link. I'd recommend going straight to using Node's built-in library Zlib for this, which includes images; encode in base 64 using "buffers". Rather than using npm packages. Reasons being:. The fact you are using jszip, would allow me to guess that you are using npm as well as node; assumes you have set up your environment correctly, i. Step 1: So you require each of the native modules from node - require is part of ES5.

Zlib as previously mentioned, and fs module, the File System module. Step 2: The fs module, this allows you to create a readstream , are specifically called to read chunks of data. This will return a readstream object; readable stream. Step 3: The readstream object, that has been piped and compressed is then converted to writestream object. So this library allows you easily enter a file path and decide where you want your compressed file to be.

You can also choose to do the reverse, if need be. However, the browser support isn't going to be great. I'm guessing that's what you meant by "unresolved issues". I would recommend, for the time being, to do it on the server.

For example, in PHP, you could use this extension. I developed a new solution to generate zip files using JavaScript. The solution is in the public domain. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

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