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Editorial Team
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Asked: 2026-05-13T22:46:22+00:00

Is there a way to queue file uploads without resorting to Flash or Silverlight,

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Is there a way to queue file uploads without resorting to Flash or Silverlight, just with cleverly used forms and JavaScript? Note that the upload should be executed asynchronously.

By “queuing” uploads I mean that if the user tries to upload multiple files, they should not be transferred simultaneously, but rather one at a time, in a single HTTP connection.

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  1. Editorial Team

    I don’t believe it’s possible to do this on a single HTTP connection, due to limitations of the spec.
    However, you may get almost the same behaviour by placing the <input> fields in separate forms (be it with HTML or JavaScript) and submitting them in order.

    Place their targets on an <iframe> and use the iframe.onload event to trigger the next form in the list.

    Additional notes:

    • See this for reference targeting iframes. Note that this feature is unsupported in HTML/XHTML Strict.
    • The form.target attribute must be equal to the iframe.name attribute. iframe.id will not work; It causes a pop-up window in IE6 and FF3.5.
    • A working example of ‘all at once’ uploading using targeting is available here. I’ve cleaned up this example a bit and used it. It works in IE6 as well as any first-class browser.
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