Can Files be Individually Removed from a FileList in HTML5 Drag-and-Drop Uploads?

File Removal in HTML5 FileList During Drag-and-Drop Uploads

In HTML5 drag-and-drop upload applications, the FileList obtained from the dataTransfer object provides access to the files dropped onto the designated area. However, doubts arise when it comes to removing specific files from this FileList.

Can Files Be Removed from FileList?

Unfortunately, at the time of writing, it's not possible to selectively remove individual files from the FileList. This limitation stems from the File API specification, which mandates the FileList attribute of the HTMLInputElement to be read-only.

Alternatives to Selective File Removal

If the goal is to prevent certain files from being processed or uploaded, there are two alternative approaches:

1. Server-Side Filtering: Implement checks in the server-side script that processes the files to filter out unwanted files. This solution is more efficient as it reduces the overhead of sending unwanted files over the network.
2. Input Value Replacement: By setting the value property of the input element (where the files are dropped) to an empty string, the entire FileList can be cleared. This can be used to reset the file selection and start over with a new set of files. However, this approach is not selective.

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