Question about image preview in client side before upload the image file to server

Hi everyone:
My project has an image upload function. Currently it only display a fileupload component, after user press OK, the file will upload to server, but there's no preview before user press OK.
I want it can show the preview, I know that I can upload the file to a temporary directory on server then show that image to client, but in this way will cause strain on server. Is there any other ways to preview the image? Like using JavaScript? Thankyou.

Stuck with BMP

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Question about image preview in client side before upload the image file to server

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