A small JS no-dependency library for a cool download experience

JS File Downloader

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Introduction

JS File Downloader is a simple no dependency library you will be able to download file from browser and show downloading status.

Browser Compatibility

JS File Downloader supports all browsers that are [ES5-compliant] (http://kangax.github.io/compat-table/es5/) (IE8 and below are not supported).

Installing with package manager

With a package manager (recomanded):

npm install js-file-downloader --save 

Basic usage

import JsFileDownloader from 'js-file-downloader';

const fileUrl = 'http://...';

new JsFileDownloader({ 
    url: fileUrl
  })
  .then(function () {
    // Called when download ended
  })
  .catch(function (error) {
    // Called when an error occurred
  });

---

Use without a package manager

Download this library from https://github.com/AleeeKoi/js-file-downloader/releases

<script src="/path/to/js-file-downloader.min.js"></script>
<script>
  // Then somewhere in your code
  new jsFileDownloader({ url: 'https://github.alessandropellizzari.it/test/apedesign-bg.png' })
    .then(function () {
      // Called when download ended
    })
    .catch(function (error) {
      // Called when an error occurred
    });
</script>

---

Options:

process (for checking download status)

A function to call every time a process event is called. Function receive an Event Object as input.

function process (event) {
  if (!event.lengthComputable) return; // guard
  var downloadingPercentage = Math.floor(event.loaded / event.total * 100);
  // what to do ...
};

new JsFileDownloader({ 
  url: '...',
  process: process
})

headers (of request)

If you need to customize request header data you can pass an array of objects like following example:

new JsFileDownloader({ 
  url: '...',
  headers: [
    { name: 'Authorization', value: 'Bearer ABC123...' }
  ]
})

filename

Setting this String you can force output file name

mobileDisabled

Boolean value (default false) to enable/disable library on mobile browsers.

timeout (ms)

Integer value (default 40000) defining how much ms attend before stop download action.

autoStart

Boolean value (default true) to enable/disable automatically starting the download. When the value is true the constructor returns a Promise, however when it’s set to false, the constructor doesn’t return anything and the download can be started by calling the start() method on the object.

Example with autoStart set to true

new JsFileDownloader({ 
  url: '...',
  autoStart: true
})

Example with autoStart set to false

const download = new JsFileDownloader({ 
  url: '...',
  autoStart: false
});

download.start()
  .then(function(){
      // success 
  })
  .catch(function(error){
      // handle errors
  });

forceDesktopMode

Boolean value (default false) to force desktop mode even on mobile devices for downloading files.

new JsFileDownloader({ 
  url: '...',
  forceDesktopMode: true
})

withCredentials

This is a Boolean that indicates whether or not cross-site Access-Control requests should be made using credentials such as cookies, authorization headers or TLS client certificates. Setting withCredentials has no effect on same-site requests.

new JsFileDownloader({ 
  url: '...',
  withCredentials: true
})

method

The HTTP request method to use, such as “GET”, “POST”, “PUT”, etc. (default “GET”) Ignored for non-HTTP(S) URLs.

new JsFileDownloader({ 
  url: '...',
  method: 'POST'
})

nameCallback

You could pass a callback to customize final name, the function receive as 1st argument the name automatically extracted.

new JsFileDownloader({ 
  url: '...',
  nameCallback: function(name) {
    return 'i-am-prefix-' + name;
  }
})

Download Details:

Author: AleeeKoi

Source Code: https://github.com/AleeeKoi/js-file-downloader

#javascript