Download multiple files then compress to one zip file using JSZip & JSZip-utils

download-multiple-files.js

var zip = new JSZip();
var count = 0;
var zipFilename = "zipFilename.zip";
var urls = [
  'http://image-url-1',
  'http://image-url-2',
  'http://image-url-3'
];

urls.forEach(function(url){
  var filename = "filename";
  // loading a file and add it in a zip file
  JSZipUtils.getBinaryContent(url, function (err, data) {
     if(err) {
        throw err; // or handle the error
     }
     zip.file(filename, data, {binary:true});
     count++;
     if (count == urls.length) {
       var zipFile = zip.generate({type: "blob"});
       saveAs(zipFile, zipFilename);
     }
  });
});

But what about downloading files of size 5 GB , 10 GB etc. When I tried this examples, it actually reads all fiiles and writes to a zip. I am looking for a solution where a user should see a zip download happening immediately after download request

I don't have actual files, but have text data (on database) and want to download the text data as files. Can I modify this method, somehow?

How to solve CORS No 'Access-Control-Allow-Origin' for getBinaryContent? @noelvo

const Image = [
   "https://pngimage.net/wp-content/uploads/2018/06/react-icon-png-7.png",
   "https://cdn4.iconfinder.com/data/icons/logos-3/426/react_js-512.png",
   "https://cdn2.iconfinder.com/data/icons/designer-skills/128/react-512.png"
 ];

let count = 0;
    Image.forEach(function(url) {
      JSZipUtils.getBinaryContent(url, function(err, data) {
        if (err) {
          throw err;
        }
        zip.file(url, data, { binary: true });
        count++;
        if (count == Image.length) {
          zip.generateAsync({ type: "blob" }).then(function(content) {
            saveAs(content, "Image.zip");
          });
        }
      });

I try with this but it doesn't work

How to solve CORS No 'Access-Control-Allow-Origin' for getBinaryContent on nextjs?

Below is code in which i am creating data for csv file and downloading csv file in zip folder:

generateCSVfiles()
{

      this.service.getStudentDetails(studentid, student.name).subscribe
          (res => {
            var dataSet = (res);
            // start
            if (studentid == "Senior") {
             
              const header = ["studentId","StudentName"];
              const replacer = (key, values) => values === null ? '' : values // specify how you want to handle null values here
              this.seniordata = items.map(row => header.map(fieldName => JSON.stringify(row[fieldName], replacer)).join(','))
              this.seniordata.unshift(header.join(','));
              this.seniordata = this.seniordata.join('\r\n');
            }
            else if (studentid == "Junior") {
               const header = ["studentId","StudentName"];
              const replacer = (key, values) => values === null ? '' : values // specify how you want to handle null values here
              this.juniordata = items.map(row => header.map(fieldName => JSON.stringify(row[fieldName], replacer)).join(','))
              this.juniordata.unshift(header.join(','));
              this.juniordata = this.juniordata.join('\r\n');
               
            }
        this.downloadzip();
   }
}
   





public downloadzip()
{
	
	 let zip = new JSZip();
      // Fill CSV variable
      zip.file( 'Studentrecord'+'.csv', this.juniordata);
	  zip.file( 'Studentrecord'+'.csv', this.seniordata);
    
    zip.generateAsync({
      type: "base64"
    }).then(function (content) {
      window.location.href = "data:application/zip;base64," + content ;
    });

}

Above code working fine and able to download csv file inside zip folder when we got response data for one of junior or Senior student. but when we received both junior and senior data at time then it downloading different zip file or sometimes only one zip file getting generated. but i want both file in one zip folder. can someone guide me how to download different csv file in one zip folder.

version 3
http://github.com/Stuk/jszip/zipball/master
https://stuk.github.io/jszip/
https://github.com/eligrey/FileSaver.js/blob/master/FileSaver.min.js

<script type="text/javascript" src="js/FileSaver.min.js"></script>
<script src="js/jszip.min.js" type="text/javascript">  </script>

var urls = [
                 "images/20170420_145140.jpg", 
                 "images/20170503_142841.jpg", 
                 "images/20170503_084035.jpg", 
                 "images/20170503_163354.jpg", 
                 "images/20170503_163334.jpg", 
                 "images/20170421_114806.jpg"];
var nombre = "Zip_img";
//The function is called
compressed_img(urls,nombre);

function compressed_img(urls,nombre) {
  var zip = new JSZip();
  var count = 0;
  var name = nombre+".zip";
  urls.forEach(function(url){
    JSZipUtils.getBinaryContent(url, function (err, data) {
      if(err) {
         throw err; 
      }
       zip.file(url, data,  {binary:true});
       count++;
       if (count == urls.length) {
         zip.generateAsync({type:'blob'}).then(function(content) {
            saveAs(content, name);
         });
       }
      });
  });
}

hello. I am using the version3 code to download a bunch of pdf from a database. I am using some big paths and those paths are creating the whole folder heirarchy on the zip. Is there a way to just put them on the top of the zip and not creating useless folders?

Hey Thank you all below code is working fine for me
var urls = [
"images/20170420_145140.jpg",
"images/20170503_142841.jpg",
"images/20170503_084035.jpg"];
download() {

        urls.forEach(function (url) {
            JSZipUtils.getBinaryContent(url, function (err, data) {
                if (err) {
                    throw err; // or handle the error
                }
                try {
                    zip.file(count + ".jpg", data, { binary: true });
                    count++;
                    if (count == urls.length) {
                        zip.generateAsync({ type: "blob" }).then(function (content) {
                            FileSaver.saveAs(content, zipFilename);
                        });
                    }
                } catch (e) {
                    console.log("errorrr...k", e)
                }
            });
        });
    }

The mistake I did is zip.file("image", data, { binary: true });
I am passing three URLs but adding name static so it is downloading one file. after changing the name dynamically it is working.

https://gist.github.com/noelvo/4502eea719f83270c8e9#gistcomment-2798024: Worked for me!!

I just created a new App using the multiple-file-downloader

Here

https://github.com/Ishaan28malik/react-zip-download