I'm currently able to verify if the user has uploaded a file with xlsx, xls, or csv extensions. How can I ensure that the uploaded file not only has these extensions but also must contain two columns with 'Example' and 'Label' headers in the frontend? If it doesn't meet these requirements, how do I prompt them to upload the correct file?
<div class="form-group"><input type="file" name="annotatedsamplefile" id="annotatedsamplefile" accept=".xlsx, .xls, .csv" class=""></div>
Perhaps a solution could involve immediately transferring the file to the backend for processing, determining if it meets the required format. If valid, a unique identifier could be assigned to the uploaded file to prevent re-uploading on future form submissions.
The approach to achieving this could vary, with options in JQuery, vanilla JavaScript, and potentially Bootstrap. Factors such as server-side language and storage method (database vs. file system) will also influence the implementation.
While client-side validation might be tempting, consider the impact on site loading speed and security risks. Business logic is best handled on the server-side for reliability. Manipulating server-side responses is more challenging than altering client-side results, highlighting the importance of centralizing crucial processes like file validation on the server.
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