How to trigger a file download when clicking an HTML button or JavaScript

You can trigger a download with the HTML5 download attribute.

<a href="path_to_file" download="proposed_file_name">Download</a> 

Where:

• path_to_file is a path that resolves to an URL on the same origin. That means the page and the file must share the same domain, subdomain, protocol (HTTP vs. HTTPS), and port (if specified). Exceptions are blob: and data: (which always work), and file: (which never works).
• proposed_file_name is the filename to save to. If it is blank, the browser defaults to the file's name.

Documentation: MDN, HTML Standard on downloading, HTML Standard on download, CanIUse

A simple JS solution:

function download(url) { const a = document.createElement('a') a.href = url a.download = url.split('/').pop() document.body.appendChild(a) a.click() document.body.removeChild(a) } 

HTML:

<button type="submit" onclick="window.open('file.doc')">Download!</button> 

With jQuery:

$("#fileRequest").click(function() { // hope the server sets Content-Disposition: attachment! window.location = 'file.doc'; }); 

You can do it with "trick" with invisible iframe. When you set "src" to it, browser reacts as if you would click a link with the same "href". As opposite to solution with form, it enables you to embed additional logic, for example activating download after timeout, when some conditions are met etc.

It is also very silient, there's no blinking new window/tab like when using window.open.

HTML:

<iframe id="invisible" style="display:none;"></iframe> 

Javascript:

function download() { var iframe = document.getElementById('invisible'); iframe.src = "file.doc"; } 

I think this is the solution you were looking for

<button type="submit" onclick="window.location.href='file.doc'">Download!</button> 

I hade a case where my Javascript generated a CSV file. Since there is no remote URL to download it I use the following implementation.

downloadCSV: function(data){ var MIME_TYPE = "text/csv"; var blob = new Blob([data], {type: MIME_TYPE}); window.location.href = window.URL.createObjectURL(blob); } 

Bootstrap Version

<a class="btn btn-danger" role="button" href="path_to_file" download="proposed_file_name"> Download </a> 

Documented in Bootstrap 4 docs, and works in Bootstrap 3 as well.

You can hide the download link and make the button click it.

<button onclick="document.getElementById('link').click()">Download!</button> <a id="link" href="file.doc" download hidden></a> 

What about:

<input type="button" value="Download Now!" onclick="window.location = 'file.doc';"> 

In my testing the following works for all file types and browsers as long as you use a relative link:

<a href="/assets/hello.txt" download="my_file.txt"><button>Download 2</button></a> 

• /assets/hello.txt is just a relative path on my site. Change it to your own relative path.
• my_file.txt is the name you want the file to be called when it is downloaded.

Explanation

I noticed there were comments under a lot of the answers that said the browser would just try to open the file itself rather than downloading it depending on the file type. I discovered this to be true.

I made two buttons to test it out using two different methods:

<button onclick="window.location.href='/assets/hello.txt';">Download 1</button> <a href="/assets/hello.txt" download="my_file.txt"><button>Download 2</button></a> 

Notes:

• Button 1 opened the text file in a new browser tab. However, Button 1 would download the file for file types that it couldn't open itself (for example, .apk files).
• Button 2 downloaded the text file. However, Button 2 only downloaded the file if the path was relative. When I changed the path to an absolute path, then the browser opened it in a new tab.

I tested this on Firefox, Safari, and Chrome.

If your looking for a vanilla JavaScript (no jQuery) solution and without using the HTML5 attribute you could try this.

const download = document.getElementById("fileRequest"); download.addEventListener('click', request); function request() { window.location = 'document.docx'; }

.dwnld-cta { border-radius: 15px 15px; width: 100px; line-height: 22px }

<h1>Download File</h1> <button id="fileRequest" class="dwnld-cta">Download</button>

Anywhere between your <body> and </body> tags, put in a button using the below code:

<button> <a href="file.doc" download>Click to Download!</a> </button> 

This is sure to work!

Hello I just include the word 'download' and works well.

<a href="file.pdf" download>Download</a> 

So in javascript you can use the follow:

function onStartedDownload(id) { console.log(`Started downloading: ${id}`); } function onFailed(error) { console.log(`Download failed: ${error}`); } var downloadUrl = "https://example.org/image.png"; var downloading = browser.downloads.download({ url : downloadUrl, filename : 'my-image-again.png', conflictAction : 'uniquify' }); downloading.then(onStartedDownload, onFailed); 

If you want

<a href="path_to_file" download="proposed_file_name">Download</a> 

for the ability to download files that would be rendered by the browser otherwise, But still want a neat javascript function to use in a button; you can have an invisible link in html and click it in javascript.

function download_file() { document.getElementById("my_download").click() }

<a id="my_download" href="path_to_file" download="file_name" style="display:none;"></a> <button onClick="download_file()">Download!!!</button>

all you need to do is add Download after the file name which you have entered:

Before:

<a href="file.doc">Download!</a> 

After

<a href="" Download="file.doc" >Download!</a> 

Make sure the download is written with a capital letter otherwise it's not gonna work.

The HTML download attribute specifies that the resource should be downloaded instead of opened in the browser.

A value can be added to the download attribute to suggest a specific value as the default filename (e.g. download="defaultFilename.jpg").

<a href="https://www.w3schools.com/images/myw3schoolsimage.jpg" download> <img src="https://www.w3schools.com/images/myw3schoolsimage.jpg" alt="W3Schools"> </a>

This is what finally worked for me since the file to be downloaded was determined when the page is loaded.

JS to update the form's action attribute:

function setFormAction() { document.getElementById("myDownloadButtonForm").action = //some code to get the filename; } 

Calling JS to update the form's action attribute:

<body onLoad="setFormAction();"> 

Form tag with the submit button:

<form method="get" id="myDownloadButtonForm" action=""> Click to open document: <button type="submit">Open Document</button> </form> 

The following did NOT work:

<form method="get" id="myDownloadButtonForm" action="javascript:someFunctionToReturnFileName();"> 

If you can't use form, another approach with downloadjs fit nice. Downloadjs use blob and html 5 file API under the hood:

<div onClick=(()=>{downloadjs(url, filename)})/> 

*it's jsx/react syntax, but can be used in pure html

Not really an answer to the original question but it may help others which face similar situations as myself.

If the file you want to download is not hosted on the same origin but you want to be able to download it, you can do that with the Content-Disposition header. Make sure the server includes the header when responding to requests of the file.

Setting a value like Content-Disposition: attachment will ensure that the file will be downloaded instead of viewed in the browser.

A simple <a href="http://www.notMyOrigin.com/file.txt">Download</a> pointing to your file should download it in this case.

In my firebase storage case:

import { getStorage, ref, getBytes, getMetadata } from "firebase/storage"; export async function downloadFile(file: UserMediaFile) { const fileRef = ref(getStorage(app), `users/${user().uid}/${file.id}`); const metadata = await getMetadata(fileRef); const totalSize = metadata.size; const arrayBuffer = await getBytes(fileRef); downloadBlob(arrayBuffer, metadata.contentType, file.name); } export function downloadBlob(buffer, type: string, name: string) { const uint8Array = new Uint8Array(buffer); const blob = new Blob([uint8Array], { type }); const url = URL.createObjectURL(blob); const a = document.createElement("a"); a.download = name; a.href = url; a.click(); URL.revokeObjectURL(url); } 

Also make sure you enable cors.json:

[ { "origin": ["http://localhost:3000", "https://example.com"], "responseHeader": ["Content-Type"], "method": ["GET", "HEAD", "DELETE"], "maxAgeSeconds": 3600 } ] 

gsutil cors set cors.json gs://your-gcp-bucket 

Another way of doing in case you have a complex URL such as file.doc?foo=bar&jon=doe is to add hidden field inside the form

<form method="get" action="file.doc"> <input type="hidden" name="foo" value="bar" /> <input type="hidden" name="john" value="doe" /> <button type="submit">Download Now</button> </form> 

inspired on @Cfreak answer which is not complete

The solution I have come up with is that you can use download attribute in anchor tag but it will only work if your html file is on the server. but you may have a question like while designing a simple html page how can we check that for that you can use VS code live server or bracket live server and you will see your download attribute will work but if you will try to open it simply by just double clicking html page it open the file instead of downloading it. conclusion: attribute download in anchor tag only works if your html file is no server.