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When applied to the tag, the media attribute is used in a purely advisory capacity. It works in the same way, and its value can be any valid media query. In HTML5 the media attribute can now also be applied to a hyperlink. If you’ve worked with CSS, then you’ve come across the media attribute before, and you’ve probably used it on the link tag. At the time of writing, Safari and IE (both desktop and mobile) do not support this attribute. While you may be thinking that the download attribute heralds the end of you having to implement file download logic on the server, unfortunately it isn’t fully supported across all major browsers. Browser Support for the download Attribute Note that in a real-world application, it is likely that the download attribute would not be hard coded, but would instead be added after input by the user ahead of downloading the image. The following example shows how you can do this when using the Canvas API.Īnd the JavaScript: ( function ( ) ) ( )
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Typically you would set the href attribute to the blob or data URI, then, as with the monthly report example earlier, set the download attribute to a more meaningful file name. The download attribute can be used with blob and data URI’s, which makes it useful where users need to be able to save dynamic content they’ve created through your web application (e.g. It’s also worth noting that the download attribute’s value can be overridden by the Content-Disposition HTTP header’s filename parameter. In practice this isn’t quite true, as you’ll need to bear in mind the restrictions operating systems impose on which characters can’t be used in filenames - such as the backslash ‘\’ on Windows, or the forward slash ‘/’ on *nix and OS X - and that the browser may adjust the download attribute’s value accordingly. In theory there aren’t any restrictions on what you can enter for the download attribute. When a user clicks the download link, they’ll download Monthly Report for March 2014.pdf rather than the endearingly named eid987jdien2i.pdf.
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Because the download attribute can be different to the href, this is pretty easy to do: Download March 2014 Report For example, you might need to generate unique files dynamically on the server for monthly or yearly reports on a per user basis, but still present the user with a meaningful filename for when they download a file. Being able to have different values for href and download can come in handy. The download attribute can be the same as the file referenced in the href attribute, but it doesn’t have to be. The value of the download attribute is used for the name of the file that is downloaded. It supplements the existing href attribute by telling the browser that the resource the href points to should be downloaded directly, instead of visited (which could happen with a file that the browser can open, like a PDF). In this article, we’ll take a quick look at what these new attributes are, and how they can be used once browser support improves. The new attributes are: download, media, and ping. But with the dawn of HTML5, three new attributes have been added to the humble tag to keep existing attributes like href, rel, and others company. Var imageURI = canvas.Hyperlinks have been around since the dawn of the Web.
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Javascript var canvas = document.getElementById("canvas") Here we draw a canvas and attach the canvas' data URI to the "Download to myImage.jpg" link. The method can take two optional parameters canvas.toDataURL(type, encoderOptions): type is the image format (if omitted the default is image/png) encoderOptions is a number between 0 and 1 indicating image quality (default is 0.92). You can save a canvas to an image file by using the method canvas.toDataURL(), that returns the data URI for the canvas' image data.