Download the image from S3 into a buffer. Download the image from S3, transform, and upload to a different S3 bucket.
dependencies var async = require( 'async') Also, name of .js file is important (we will see that later in this article). You need to download this library and put it in node_modules folder. If you don't upload professional photos, that should not be a problem. Solution Being able to intercept the uploading process and modifying the file, we would need to override the private uploadFile method of the AsyncUpload's upload module. But you should keep in mind several things if you resize image on the client: You will have only 8bits per channel (jpeg can have better dynamic range, about 12 bits). Resize images on client-side before uploading them with the RadAsyncUpload control. It appears the only way to create a true File object is to append a blob to a FormData object but I don't know how to get it back out. If you have a solution to this problem, please let me know.We would be using async, aws-sdk, gm & path lib. In modern browser you can use canvas to load/save image data.
Take a look at this: Resizing an image in an HTML5 canvas Solution 2 I just developed a javascript library called JIC to solve that problem. The args.get_fileInputField().files array is populated with JavaScript File objects which have had additional properties added to them. Solution 1 You might be able to resize the image with canvas and export it using dataURI. Determine the correct dimensions for the image. Essentially, the process involves the following steps: Read in the user-chosen file (e.g. I attempted to solve this by overriding the default _onFileSelected function from the RadAsyncUpload's prototype object but I ran into the second problem.Ģ. For image-resizing, as you might have guessed, this involves making use of the HTML canvas element. Once the image is compressed, saving it back to the args.get_fileInputField().files array has no effect because the upload has already begun.
Because this event happens asynchronously, the upload from the control begins prior to the onload event firing. The image compression must be done on the "onload" event of the image created from the uploaded file so the compression function actually has something complete to compress. However, I have attempted to use the code in the StackOverflow answer to implement client-side image compression and have run into the following problems:ġ.
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