WebApp Using dir to get client directoy

Question

Dominik Pahlke 2022-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/1774245-webapp-using-dir-to-get-client-directoy

回答： Walter Roberson 2022-8-5

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Hey,

i developed an app which is reading a list of images on the client computer and viewing / filtering those.

I am in the process of porting this app to be a web app. At one point I read all image files from a specific dir using

dir([directory '\**\*.png']);

As it turns out when using dir in a webapp the server executes dir on the Server the Webapp is running on not on the client Computer.

Is there a way to get a list of all png files in the set directory of the client computer?

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Answer 1

Walter Roberson 2022-8-5

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There is no supported way to do that.

Technically, the ability is (if I recall correctly) supported with restrictions under HTML5, and is implemented by the Chromium engine -- so supported on Google Chrome browser, and just possibly Microsoft Edge browser, but no other browser that I can think of. For Google Chrome, the remote user has to specifically authorize the access. The server kind of sends javascript to the browser in a special way and the javascript gets executed inside a sandbox that authenticates it and checks for user permission before executing the operation.