Javascript download temp file

If you have download a file, which is saved, as opposed to being in the document, there's no way to determine when the download is complete, since it is not in the scope of the current document, but a separate process in the browser. BUT onload does not fire in IE for file downloads like with the attachment header token. Polling the server works, but I dislike the extra complexity. So here is what I do:. But really, if your sites that busy the long running process will starve you of threads anyways.

A quick solution if you only want to display a message or a loader gif until the download dialog is displayed is to put the message in a hidden container and when you click on the button that generate the file to be downloaded you make the container visible.

Then use jquery or javascript to catch the focusout event of the button to hide the container that contain the message. If Xmlhttprequest with blob is not an option then you can open your file in new window and check if eny elements get populated in that window body with interval. Then the server-side overrides this cookie with an earlier expiration age -- the completion of the server process.

As soon as the cookie expiration is detected in the JS polling, "Loading You can rely on the browser's cache and trigger second download of the same file when the file is loaded to the cache.

How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Detect when browser receives file download Ask Question. Asked 12 years, 4 months ago.

Active 3 months ago. Viewed k times. Does anyone have a better idea? Improve this question. Riyaz Khan 1, 7 7 silver badges 21 21 bronze badges. Thanks Eric -- that's good to know. I won't waste any more time with that approach. NET folks. Show 2 more comments. Active Oldest Votes. The client algorithm: Generate a random unique token.

Show the "waiting" indicator. Start a timer, and every second or so, look for a cookie named "fileDownloadToken" or whatever you decide. If the cookie exists, and its value matches the token, hide the "waiting" indicator. If it has a non-empty value, drop a cookie e. Improve this answer. David Passmore 6, 4 4 gold badges 43 43 silver badges 68 68 bronze badges. A heads up for others: if document. For some time I thought the issue was the special 'localhost' domain cookie handling stackoverflow.

May be that for others though so worth the read. Do you think that it will, or cookies restrictions will compromise it? Brilliant - it wouldn't have occurred to me in years that you could include cookies as part of a file download. Thank you!! As others have pointed out, this solution only solves part of the problem, the waiting for the server to prepare the file time.

The other part of the problem, which can be considerable depending on the size of the file and the connection speed, is how long it takes to actually get the whole file on the client.

And that is not solved with this solution. Show 16 more comments. Echilon 9, 28 28 gold badges silver badges bronze badges. This is a simple approach which is ideal for getting rid of a loading overlay for a file download which was triggered using onbeforeunload Thank you. Safari, some IE versions, etc. Chrome and other such browsers auto-download the files where this condition will fail. Lucky that is only by default.

It is entirely possible a user of Chrome will specify where downloads should be saved and hence see the dialog box — ESR. Add a comment. Don't eval code inside setTimeout 'getstatus ', ;. Use the fn directly: setTimeout getstatus, ; — Roko C. Jerzy Gebler Jerzy Gebler 9 9 silver badges 13 13 bronze badges. What if the user clicks the window? The hide is not getting called in my case — Prashant Pimpale. Worked for me for a pdf download with only some line of codes — Chris.

My case is working on JSP and click to download csv. It works. Show 1 more comment. This literal contains one or more values telling its method what to do. The value create: true tells the method to create the file. A BLOB is a binary large object which is able to consist of random content such as text, images or other. To actually write contents to a file, the method getFile receives a third parameter as a function call. This function carries the parameter DatFile.

From here we call the method createWriter , which is responsible for filling the file with content. Now we write the BLOB to the file. To remove a file from the filesystem we would correspondingly use remove. Although deleting does not require any additional information, the method stills expects a function. It can be left empty, though.

Corresponding to getFile for files, we will use getDirectory for folders. The concept is the same. We are able to create folders and delete them again:. Our example creates the folder named demo. Afterwards you could create a file in that given folder like so:. Using the method moveTo allows you to move files from one folder to another. Then the method getDirectory defines the target directory and activates moveTo :.

Besides moving files back and forth, moveTo is only there to rename files. To achieve this, call the method separately, i. As the created files and folders are stored to a protected area controlled by the browser, it is not possible to open them as usual by simple adding the file or folder names to the URL string.

Instead we have a separate protocol to read-access these elements. Using the specific string you can embed them to other documents or simply call them from the address bar:. A URL for locally stored files always starts with filesystem: followed by the domain with leading http.

Download File Using. Download this file. For Downloading, Click. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment?

Please use ide. You can load the image into a canvas element get the data URL of the canvas and open a new window with the data URL as the source.

And to fix it try defining crossOrigin attr with anonymous in image. You can read more about this issue here: Allowing cross-origin use of images and canvas. Web Development Javascript.