You can also encrypt the download link by setting a password and expiry date on it. In the past, popular browsers have made automatic downloads difficult to execute due to safety concerns. This way of making JavaScript download files allows users to retrieve the content provided in the text area.
The file reaches the computer device as a simple. The declared function sets a download attribute where you get to name the file. The encodeURIComponent function then encodes the content.
The click method prompts the download process to start as you click the download button. There is another option for downloading files without contacting the server.
This time, we are using a JavaScript library called FileSaver. The example below presents the syntax to implement the saveAs FileSaver interface:. It sets the file to a Blob value. For instance, it is useful for preventing sensitive information from being sent to external servers.
It includes but is not limited to multimedia objects , programs , and code snippets. Remember: as Blob has size limitations based on the supported browser, FileSaver.
See the table below to check the compatibility of FileSaver. Learn easily by using our HTML5 canvas examples. As you can see above, the download attribute is the easiest way to download a file on the browser. However, the download attribute only works in modern browsers. Internet Explorer does not support it. The idea is to programmatically create an anchor link, and then trigger the click event.
This method is especially helpful for dynamically generated file URLs. Sometimes, you may want to save programmatically generated data as a file using JavaScript. That's where blobs and object URLs are useful. A Blob object is a file-like object used to represent raw immutable data.
Blob objects contain information about the type and size of data they store, making them very useful for storing dynamic contents in the browser. The server can distinguish the XHR from the iframe by checking the incoming headers. If the server waits to send headers until the file data is ready, the XHR can roughly detect when the iframe has started to download even without CORS. The client has to guess as to when the download has actually started to remove the iframe from the DOM.
Can't send custom headers on the iframe. CubicleSoft CubicleSoft 1, 15 15 silver badges 18 18 bronze badges. Elmer Elmer 8, 1 1 gold badge 44 44 silver badges 35 35 bronze badges. Still has the issue of switching window and returning which will cause the modal to hide.
JQuery is supported but not required. Community Bot 1 1 1 silver badge. Jorge Paulo Jorge Paulo 3 3 silver badges 4 4 bronze badges. Art Geigel Art Geigel 1, 3 3 gold badges 19 19 silver badges 23 23 bronze badges.
MB33 MB33 71 1 1 silver badge 1 1 bronze badge. It's works perfectly. Thanks for this beatiful sample. I'm very late to the party but I'll put this up here if anyone else would like to know my solution: I had a real struggle with this exact problem but I found a viable solution using iframes I know, I know.
It's terrible but it works for a simple problem that I had I had an html page that launched a separate php script that generated the file and then downloaded it. Walker Boh Walker Boh 6 6 silver badges 13 13 bronze badges. If the file is ready, do the download.
If the file is not ready, show the progress. That sounds like the temporary-file approach I mentioned above. I might do something like this if it turns out my idea is impossible, but I was hoping to avoid it. Vladimir Salguero 4, 2 2 gold badges 37 37 silver badges 42 42 bronze badges. Manuel Larrota Manuel Larrota 2 2 silver badges 5 5 bronze badges.
Works but basically transforms data to Base64 on the memory before reconverting to binary and downloading. Not recommended for large files — Erdal G. How can I set the final downloaded filename to the filename which is fetched from url? In my experience, there are two ways to handle this: Set a short-lived cookie on the download, and have JavaScript continually check for its existence. Only real issue is getting the cookie lifetime right - too short and the JS can miss it, too long and it might cancel the download screens for other downloads.
Using JS to remove the cookie upon discovery usually fixes this. Not only do you know exactly when the file download finishes, if you use XHR you can use progress events to show a progress bar! The problem with this method is that iOS Safari doesn't seem to handle downloading blobs right - you can convert the blob into a data URL with a FileReader and open that in a new window, but that's opening the file, not saving it.
Sora Sora 7 7 silver badges 19 19 bronze badges. I should clarify -- I"m not too concerned with when the download completes. If I can just identify when the download starts, that would be enough. So here is what I do: Target the hidden iFrame as usual. Generate the content. Cache it with an absolute timeout in 2 minutes.
Send a javascript redirect back to the calling client, essentially calling the generator page a second time. Remove the content from the cache and send it to the client. Here is what the codebehind looks like, which is all you really need. QueryString[ "data" ]! Write "Javascript to tell user there was a problem. AppendHeader "Pragma", "no-cache" ; Response. AppendHeader "content-size", data.
ToString ; Response. I am loading a file just for an example using System. Open using System. Length ]; reader. Read data, 0, data. Insert reportKey, data, null, DateTime. AddMinutes 5 , TimeSpan. Add "onload", "window. MarcLawrence MarcLawrence 5 5 bronze badges. Mihaela Rada Mihaela Rada 23 5 5 bronze badges. Some logic for downloading, returning a result The cookie is created by the JS script but it's not updated by the controller, it maintains the original value 0 , how can I update the cookie value without refreshing the page?
That's strange - can you ensure the name is exactly correct? It will overwrite the cookie if the name matches. Let me know — gene b. The original value is not 0. The original value set in JS is 2 min. The NEW value that the server is supposed to modify with is 0.
Also, are you doing this: myCookie. I figured out for some reason , that I should add cookies before doing response.
I have updated the below reference code. Add a proper download URL link and try this out. Download window popped up. Jsowa Jsowa 5, 4 4 gold badges 33 33 silver badges 38 38 bronze badges. Pir Abdul Pir Abdul 2, 1 1 gold badge 22 22 silver badges 35 35 bronze badges. This is lacking information and it doesn't solve the "when to hide loading" issue. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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