How can I create download link in HTML? - html

I have a basic idea of HTML. I want to create the download link in my sample website, but I don't have idea of how to create it. How do I make a link to download a file rather than visit it?

In modern browsers that support HTML5, the following is possible:
<a href="link/to/your/download/file" download>Download link</a>
You also can use this:
Download link
This will allow you to change the name of the file actually being downloaded.

This answer is outdated. We now have the download attribute. (see also this link to MDN)
If by "the download link" you mean a link to a file to download, use
Download
the target=_blank will make a new browser window appear before the download starts. That window will usually be closed when the browser discovers that the resource is a file download.
Note that file types known to the browser (e.g. JPG or GIF images) will usually be opened within the browser.
You can try sending the right headers to force a download like outlined e.g. here. (server side scripting or access to the server settings is required for that.)

In addition (or in replacement) to the HTML5's <a download attribute already mentioned,
the browser's download to disk behavior can also be triggered by the following http response header:
Content-Disposition: attachment; filename=ProposedFileName.txt;
This was the way to do before HTML5 (and still works with browsers supporting HTML5).

A download link would be a link to the resource you want to download. It is constructed in the same way that any other link would be:
Link
Link to installer

To link to the file, do the same as any other page link:
link text
To force things to download even if they have an embedded plugin (Windows + QuickTime = ugh), you can use this in your htaccess / apache2.conf:
AddType application/octet-stream EXTENSION

This thread is probably ancient by now, but this works in html5 for my local file.
For pdfs:
<p>test pdf</p>
This should open the pdf in a new windows and allow you to download it (in firefox at least). For any other file, just make it the filename. For images and music, you'd want to store them in the same directory as your site though. So it'd be like
<p><a href="images/logo2.png" download>test pdf</a></p>

There's one more subtlety that can help here.
I want to have links that both allow in-browser playing and display as well as one for purely downloading. The new download attribute is fine, but doesn't work all the time because the browser's compulsion to play the or display the file is still very strong.
BUT.. this is based on examining the extension on the URL's filename!You don't want to fiddle with the server's extension mapping because you want to deliver the same file two different ways. So for the download, you can fool it by softlinking the file to a name that is opaque to this extension mapping, pointing to it, and then using download's rename feature to fix the name.
<a target="_blank" download="realname.mp3" href="realname.UNKNOWN">Download it</a>
<a target="_blank" href="realname.mp3">Play it</a>
I was hoping just throwing a dummy query on the end or otherwise obfuscating the extension would work, but sadly, it doesn't.

You can use in two ways
<a href="yourfilename" download>Download</a>
it will download file with original name In Old Browsers this option was not available
2nd
Download
Here You have option to rename your file and download with a different name

The download attribute is new for the <a> tag in HTML5
<a href="http://www.odin.com/form.pdf" download>Download Form</a>
or
Download Form
I prefer the first one it is preferable in respect to any extension.

If you host your file in AWS, this may work for you. The code is very easy to understand. Because the browser doesn't support same-origin download links, 1 way to solve it is to convert the image URL to a base64 URL. Then, you can download it normally.
var canvas = document.createElement("canvas")
var ctx = canvas.getContext('2d')
var img = new Image()
img.src = your_file_url + '?' + new Date().getTime();
img.setAttribute('crossOrigin', '')
var array = your_file_url.src.split("/")
var fileName = array[array.length - 1]
img.onload = function() {
canvas.width = img.naturalWidth
canvas.height = img.naturalHeight
ctx.drawImage(img,
0, 0, img.naturalWidth, img.naturalHeight,
0, 0, canvas.width, canvas.height)
var dataUrl = canvas.toDataURL("image/png", 1)
var a = document.createElement('a')
a.href = dataUrl
a.download = fileName
document.body.appendChild(a)
a.click()
document.body.removeChild(a)
}

Like this
Link name
So a file name.jpg on a site example.com would look like this
Image

i know i am late but this is what i got after 1 hour of search
<?php
$file = 'file.pdf';
if (! file) {
die('file not found'); //Or do something
} else {
if(isset($_GET['file'])){
// Set headers
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=$file");
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: binary");
// Read the file from disk
readfile($file); }
}
?>
and for downloadable link i did this
Download PDF

Related

toDataURL Image download has no extension

I am downloading an image when a div is clicked by using...
document.location.href = save_canvas.toDataURL("image/jpeg").replace("image/jpeg", "image/octet-stream");
This is working but the image that downloads has no extension and is just called 'download'
I have tried setting the name like this...
document.location.download = "myfile.jpg";
document.location.href = save_canvas.toDataURL("image/jpeg").replace("image/jpeg", "image/octet-stream");
But it is having no effect, where am i going wrong?
The download attribute is not part of the Location object as document.location holds, only for the HTML anchor (A) tags (except in IE).
Depending on browser and version you could instead try to convert canvas into a Blob object, then to File in order to set a filename, and serve that as URL via URL.createObjectURL(). Also here, toBlob() is not supported in IE (but you can polyfill toBlob(), and use msSaveBlob instead).
(and you would also want to replace mime-type's "image" with "application" for mime-type (e.g. "application/octet-stream"). )
c.toBlob(function(blob) {
var file = new File([blob], "test.png", {type: "application/octet-stream"});
document.location.href = URL.createObjectURL(file);
})
A save request with PNG and filename should appear when running this code...
<canvas id=c></canvas>
Optionally, try the FileSaver.js library which deals with many special cases.

What does "blob" mean in the `href` property in "<link>"? [duplicate]

My page generates a URL like this: "blob:http%3A//localhost%3A8383/568233a1-8b13-48b3-84d5-cca045ae384f" How can I convert it to a normal address?
I'm using it as an <img>'s src attribute.
A URL that was created from a JavaScript Blob can not be converted to a "normal" URL.
A blob: URL does not refer to data the exists on the server, it refers to data that your browser currently has in memory, for the current page. It will not be available on other pages, it will not be available in other browsers, and it will not be available from other computers.
Therefore it does not make sense, in general, to convert a Blob URL to a "normal" URL. If you wanted an ordinary URL, you would have to send the data from the browser to a server and have the server make it available like an ordinary file.
It is possible convert a blob: URL into a data: URL, at least in Chrome. You can use an AJAX request to "fetch" the data from the blob: URL (even though it's really just pulling it out of your browser's memory, not making an HTTP request).
Here's an example:
var blob = new Blob(["Hello, world!"], { type: 'text/plain' });
var blobUrl = URL.createObjectURL(blob);
var xhr = new XMLHttpRequest;
xhr.responseType = 'blob';
xhr.onload = function() {
var recoveredBlob = xhr.response;
var reader = new FileReader;
reader.onload = function() {
var blobAsDataUrl = reader.result;
window.location = blobAsDataUrl;
};
reader.readAsDataURL(recoveredBlob);
};
xhr.open('GET', blobUrl);
xhr.send();
data: URLs are probably not what you mean by "normal" and can be problematically large. However they do work like normal URLs in that they can be shared; they're not specific to the current browser or session.
another way to create a data url from blob url may be using canvas.
var canvas = document.createElement("canvas")
var context = canvas.getContext("2d")
context.drawImage(img, 0, 0) // i assume that img.src is your blob url
var dataurl = canvas.toDataURL("your prefer type", your prefer quality)
as what i saw in mdn, canvas.toDataURL is supported well by browsers. (except ie<9, always ie<9)
For those who came here looking for a way to download a blob url video / audio, this answer worked for me. In short, you would need to find an *.m3u8 file on the desired web page through Chrome -> Network tab and paste it into a VLC player.
Another guide shows you how to save a stream with the VLC Player.
UPDATE:
An alternative way of downloading the videos from a blob url is by using the mass downloader and joining the files together.
Download Videos Part
Open network tab in chrome dev tools
Reload the webpage
Filter .m3u8 files
Look through all filtered files and find the playlist of the '.ts' files. It should look something like this:
You need to extract those links somehow. Either download and edit the file manually OR use any other method you like. As you can see, those links are very similar, the only thing that differs is the serial number of the video: 's-0-v1-a1.ts', 's-1-v1-a1.ts' etc.
https://some-website.net/del/8cf.m3u8/s-0-v1-a1.ts
https://some-website.net/del/8cf.m3u8/s-1-v1-a1.ts
https://some-website.net/del/8cf.m3u8/s-2-v1-a1.ts
and so on up to the last link in the .m3u8 playlist file. These .ts files are actually your video. You need to download all of them.
For bulk downloading I prefer using the Simple Mass Downloader extension for Chrome (https://chrome.google.com/webstore/detail/simple-mass-downloader/abdkkegmcbiomijcbdaodaflgehfffed)
If you opt in for the Simple Mass Downloader, you need to:
a. Select a Pattern URL
b. Enter your link in the address field with only one modification: that part of the link that is changing for each next video needs to be replaced with the pattern in square brackets [0:400] where 0 is the first file name and 400 is the last one. So your link should look something like this https://some-website.net/del/8cf.m3u8/s-[0:400]-v1-a1.ts.
Afterwards hit the Import button to add these links into the Download List of Mass Downloader.
c. The next action may ask you for the destination folder for EACH video you download. So it is highly recommended to specify the default download folder in Chrome Settings and disable the Select Destination option in Chrome Settings as well. This will save you a lot of time! Additionally you may want you specify the folder where these files will go to:
c1. Click on Select All checkbox to select all files from the Download List.
c2. Click on the Download button in the bottom right corner of the SMD extension window. It will take you to next tab to start downloading
c3. Hit Start selected. This will download all vids automatically into the download folder.
That is it! Simply wait till all files are downloaded and you can watch them via the VLC Player or any other player that supports the .ts format. However, if you want to have one video instead of those you have downloaded, you need to join all these mini-videos together
Joining Videos Part
Since I am working on Mac, I am not aware of how you would do this on Windows. If you are the Windows user and you want to merge the videos, feel free to google for the windows solution. The next steps are applicable for Mac only.
Open Terminal in the folder you want the new video to be saved in
Type: cat and hit space
Open the folder where you downloaded your .ts video. Select all .ts videos that you want to join (use your mouse or cmd+A)
Drag and drop them into the terminal
Hit space
Hit >
Hit Space
Type the name of the new video, e.g. my_new_video.ts. Please note that the format has to be the same as in the original videos, otherwise it will take long time to convert and even may fail!
Hit Enter. Wait for the terminal to finish the joining process and enjoy watching your video!
Found this answer here and wanted to reference it as it appear much cleaner than the accepted answer:
function blobToDataURL(blob, callback) {
var fileReader = new FileReader();
fileReader.onload = function(e) {callback(e.target.result);}
fileReader.readAsDataURL(blob);
}
I'm very late to the party.
If you want to download the content you can simply use fetch now
fetch(blobURL)
.then(res => res.blob())
.then(blob => /*do what you want with the blob here*/)
Here the solution:
let blob = new Blob(chunks, { 'type' : 'video/mp4;' });
let videoURL = window.URL.createObjectURL(blob);
const blobF = await fetch(videoURL).then(res => res.blob())
As the previous answer have said, there is no way to decode it back to url, even when you try to see it from the chrome devtools panel, the url may be still encoded as blob.
However, it's possible to get the data, another way to obtain the data is to put it into an anchor and directly download it.
<a href="blob:http://example.com/xxxx-xxxx-xxxx-xxxx" download>download</a>
Insert this to the page containing blob url and click the button, you get the content.
Another way is to intercept the ajax call via a proxy server, then you could view the true image url.

Chrome Download Attribute not working to replace the original name

I've experienced some unexpected behavior of Chrome since the newest version:
While in Firefox this Code is working Perfectly fine:
<a
id="playlist"
class="button"
download="Name.xspf"
href="data:application/octet-stream;base64,PD94ANDSOON"
style="display: inline;">
Download Me
</a>
It isn't working in Chrome (Simply downloading a file named "Download"), but has worked pretty fine before. What do I have to change that it is working again?
After some research I have finally found your problem.
<a>'s download attribute:
If the HTTP header Content-Disposition: is present and gives a different filename than this attribute, the HTTP header has priority over this attribute.
If this attribute is present and Content-Disposition: is set to inline, Firefox gives priority to Content-Disposition, like for the filename case, while Chrome gives priority to the download attribute.
Source
HTTP-Header Content-Disposition
Reading the comments, I had the same issue as #buffer-overflow and found this in the issue:
I'm guessing that the web page and the download are on different origins. We no longer honor the download attribute suggested filename for cross origin requests. Clicking on the link still initiates a download. But the the filename is only derived from factors solely dependent on the server (e.g. Content-Disposition header in the response and the URL).
So no chance I could make it work ... :(
I had this problem with wordpress, the problem is that wordpress generates the full path of the file, and in the a tag you have to remove the full domain name and add a relative path
Example, instead of:
<a href="http://mywordpresssite.com/wp-content/uploads/file.mp4" download="file.mp4" >
You have to do this:
<a href="/wp-content/uploads/file.mp4" download="file.mp4">
This will make it work
This is the current behaviour in Chrome as of 16 Aug, 2021
If you are calling an api like this:
http://localhost:9000/api/v1/service/email/attachment/dummy.pdf
Chrome will try to parse the last value of the path param and ignore any value passed to attachment attribute of a link if Content-Disposition is not set or is set to inline from the server, in which case the pdf file will have the name dummy.pdf
If Content-Disposition is set to attachment, then chrome will save the file with the filename value from Content-Disposition header.
That is if the server were to respond like this:
res.setHeader(
"Content-disposition",
"attachment; filename=" + "server-dummy.pdf"
);
res.setHeader("Content-Type", "application/pdf");
The file would be saved as server-dummy.pdf regardless of the presence of download attribute.
I have a simple solution regarding this issue. You just need to put your html file into a server like Apache using xampp control and so on. Because the download attribute is properly working through a server.
<a download href="data:application/octet-stream;base64,PD94ANDSOON">Download Me</a>
Are you looking at the files via a web server or your local filesystem - Does the browser's URL bar start with http:// or file:///?
I just ran some tests in Chrome, and while it will download the file, it doesn't respect the value of the download attribute when you're using the local file.
If you start hosting it on a web server, this will start working. If you're just doing this for yourself on your computer, check out WAMP for Windows or MAMP for macOS to get started with Apache.
I recommend using the file-saver NPM Package to implement or force download.
// 1.
npm i file-saver // install via npm or
yarn add file-saver // install via yarn
// 2.
import { saveAs } from 'file-saver'
// 3.
saveAs('https://httpbin.org/image', 'image.jpg')
References
https://www.npmjs.com/package/file-saver
https://www.npmjs.com/package/file-saver#saving-urls // direct url to Saving URLs
https://www.javascripting.com/view/filesaver-js
It won't work without a server. download attribute will do the work only when using a server (local/remote) like tomcat/xampp/wampserver...
<a href="videos/sample.mp4" download>Download Video</a>
<a href="images/sample.jpg" download>Download Image</a>
Not just only for videos or images.
In case anyone is having problems with this when the address of the file is different from this one, you could try to:
Locally create a Blob from downloading locally the original file.
Creating a URL object based on the local Blob.
It would look like this:
const outsideRes = await fetch(outsideUrl);
const blob = await outsideRes.blob();
const url = window.URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = "marketing-payout-report.csv";
link.click();
This can be resolved by adding target="_blank" attribute to the href.
Like this:
Save sprites.svg as
<a target="_blank" download="somefilename.svg"
href="https://cdn.sstatic.net/Img/unified/sprites.svg"
>somefilename.svg</a>
The file has to be in some zipped format!
Go To Chrome Click on “Settings” and you'll see a new page pop up in your Chrome browser window. Scroll down to Advanced Settings, find the Downloads group, and clear your Auto Open options. Next time you download an item, it will be saved instead of opened automatically.

View a PDF file in HTML not to download it

I have a very simple pure html file in which I have many PDF files. I have link it like this:
PDF 1 here
When I click the link, the PDF file is downaloaded and viewed in the native Reader program. I want it to open in another window of the browser, and read it there, rather then saving a copy manually to my computer and opening it.
2018 Update
Almost all modern browsers have built-in PDF viewers. You can directly link to the PDF file and the browser will view it. You can also use an <iframe> if you want to view it inside an HTML page (e.g. with your website headers, etc.).
Another approach, but more complicated and not necessary except for very special circumstances, is to convert the PDF files to HTML (as described in #1 of the 2012 answer below).
Original Answer (Outdated, from 2012)
Viewing the PDF file in the browser (without download) requires an add-on to the client's browser. Google Chrome, for example, has a built-in PDF viewer and can open files directly, while IE and Firefox require that you install a plug-in (the one that comes with Adobe Reader).
There are two other approaches:
Convert the file to HTML, image, or any other format that can be directly viewed in the browser. This conversion can be on-the-fly using a server-side (written in PHP, Python, ASP, whatever language), or you can just pre-convert all files to a readable one.
The other approach, which is the best, is to use a Flash-based PDF viewer (such as http://flexpaper.devaldi.com/). This is easy, flexible and doesn't require writing server-side code. This approach is used by many Document-sharing sites (e.g. http://www.scribd.com/, http://www.slideshare.net/, http://www.docstoc.com/)
i use this
for the HTML
<img src="images/view.png" alt=" " border="0"/>
and the view.php file for viewing it through PDF.
<?php
$path = $_SERVER['DOCUMENT_ROOT']."/demo/documents/"; // change the path to fit your websites document structure
$fullPath = $path.$_GET['download_file'];
if ($fd = fopen ($fullPath, "r")) {
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext) {
case "pdf":
header("Content-type: application/pdf"); // add here more headers for diff. extensions
header("Content-Disposition: inline; filename=\"".$path_parts["basename"]."\"");
break;
default;
header("Content-type: application/octet-stream");
header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
}
header("Content-length: $fsize");
header("Cache-control: private"); //use this to open files directly
while(!feof($fd)) {
$buffer = fread($fd, 2048);
echo $buffer;
}
}
fclose ($fd);
exit;
?>
Make sure the your browser has PDF add-on on it.
Mozilla created the PDF.js library. It displays pdf files in a web page without an external reader or plugin.
Your browser needs a PDF reader plug in to read PDFs in browser. A quick google search should provide you with one for whatever browser you are using.
If the file is not cached, it has to be downloaded. That is, if you grab it using HTTP. If it's on your local filesystem, you could use the file URI scheme.
right click
Open with
Choose default programme
Select
Adobe Reader
OK
If you want open chrome any other app
Same steps
Last Step
Select
Chrome

Button to download HTML of a page

Is there a way to have a button/link and when you click on it, it will take the current page location and download an HTML version of it? It will be an iframe too, and the link should just download the iframe's content. Thanks!
The following JavaScript will take the current document and provide it as a download link. Tested in Chrome, not sure about others. Keep in mind that IE has limits for DataURI size. Furthermore, you'll lose your external images/CSS/etc, unless you inject the base tag into the top of the head tag (or find some other way to roll in resources):
// create the link to trigger download
// you could alternatively fetch an existing tag and update it
var a = document.createElement('a');
// send as type application/octet-stream to force download, not in browser
a.href =
"data:application/octet-stream;base64," +
btoa("<html>"+ document.getElementsByTagName('html')[0].outerHTML +
"</html>");
a.innerText = "Download this page";
// put the link wherever you want
document.body.appendChild(a);
EDIT: also doesn't provide a filename, or a .htm at the end of the download link... hmph. Those things can only really be provided by the Content-Disposition header, and that requires sending a request off to the server, so... not a fantastic user experience, but the easiest way to get the exact page state as the user sees it.
All you need is a simple script that takes the file name as a param and generates a zip. Here is an example in PHP.