- Javascript:void(0) I get this when trying to download attachments from my email in Juno. 'javascript:void(0)' and nothing else happens. A similar problem occurs when I click on embedded links, nothing happens.
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TL;DR – The JavaScript download method allows you to declare a unique function for downloading files without contacting the server and lets you hide the file path from users.
Contents
What are automatic downloads with JavaScript?
Automatic file download with JavaScript is a method that allows you to retrieve a file directly from the URL by declaring a JavaScript function.
It is done without sending an action request to a server. You can use this method on browsers that support HTML5.
Note: automatic downloads allow you to build a secure download link that prevents users from seeing the file path.
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. With the HTML5 and JavaScript download method, this is no longer an issue.
Making JavaScript download files without the server
Here is the syntax for downloading a file directly from browsers:
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 .txt, opening in the standard text editor.
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.
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Using FileSaver.js to download files on the client-side
There is another option for downloading files without contacting the server. This time, we are using a JavaScript library called FileSaver.js. The example below presents the syntax to implement the saveAs() FileSaver interface:
Note: this option allows you to implement the saveAs() FileSaver interface in browsers that don’t support it. It sets the file to a Blob value.
FileSaver.js is a solid solution for downloading files on the client-side instead of involving the server-side. For instance, it is useful for preventing sensitive information from being sent to external servers.
What is a Blob?
Blob, which stands for Binary Large Object, represents data that doesn’t support JavaScript-native format. 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.js is only suitable for small or medium sized files (500-800 MiB max).
See the table below to check the compatibility of FileSaver.js in different browsers:
| Browser | Builds as | Filenames | Max Blob Size | Dependencies |
|---|---|---|---|---|
| Firefox 20+ | Blob | Yes | 800 MiB | None |
| Firefox < 20 | data: URI | No | n/a | Blob.js |
| Chrome | Blob | Yes | 500 MiB | None |
| Chrome for Android | Blob | Yes | 500 MiB | None |
| Edge | Blob | Yes | Unknown | None |
| IE 10 | Blob | Yes | 600 MiB | None |
| Opera 15+ | Blob | Yes | 500 MiB | None |
| Opera < 15+ | data: URI | No | n/a | Blob.js |
| Safari 6.1+ | Blob | No | Unknown | None |
| Safari < 6 | data: URI | No | n/a | Blob.js |
The following code snippet checks whether a browser supports Blob objects:
JavaScript download: useful tips
- In some cases, instead of downloading blobs, Safari 6.1+ users will open them. Then, they would have to press a combination of ? + S on their keyboard to save the opened file.
- As FileSaver.js can only support small to medium-sized files, you can use StreamSaver.js for large files.
On Wednesday, August 29, 2012 at 12:28:29 PM UTC-4, xua...@gmail.com wrote:I just realized that if I have DevTools undocked I only need to close and reopen them. That seems to refresh the content. It doesn't work if they are docked, though.
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Thanks very much for your time, Vsevolod. I can work like this for now :)On Wednesday, August 29, 2012 5:19:10 PM UTC+1, Xuanah wrote:Sorry, I really didn't understand what you meant.
DevTools on DevTools is not reporting any errors nor warnings. Also, from time to time all starts working as expected for a while. And then it goes back to this weird state.
On Wednesday, August 29, 2012 5:06:17 PM UTC+1, Vsevolod Vlasov wrote:> I have 4 errors, but they are related to the framework (a few GUI files missing, and they have been popping up since I started the project).
Could you try looking for console errors DevTools on DevTools? (You could open DevTools on DevTools with Ctrl-Shift-I or other shortcut when devtools are in undocked mode.)
Thank you,