Can jQuery AJAX Upload Files via POST, and What Browser Compatibility Should I Expect?

jQuery Ajax File Upload: A Discussion

The question of whether the provided jQuery code can perform file upload using AJAX's POST method prompts a deeper exploration into browser support for such operations.

As previously understood, file upload through AJAX was traditionally not possible. However, with the advent of XMLHttpRequest Level 2 (XHR2), this capability has become available through the use of the FormData object. Unfortunately, XHR2 and FormData support is limited to certain browser versions, namely:

• IE 10
• Firefox 4.0
• Chrome 7
• Safari 5
• Opera 12

Therefore, while file upload is now technically possible with modern browsers, it must be noted that legacy browsers will not support this functionality.

Regarding the data part of the AJAX request, if using FormData, it does not need to be filled as FormData takes care of preparing the file data for upload. However, if using an older approach such as IFrame, the data part may be needed.

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