[WICKET-6517] use Ajax for multipart instead of iframe

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 8.0.0-M8
• Fix Version/s: 8.0.0-M9
• Component/s: wicket
• Assignee: Sven Meier
• Reporter: Sven Meier
• Created: 12/Jan/18 11:34
• Updated: 19/Feb/21 23:55
• Resolved: 26/Jan/18 22:56

Description

As Andrew Kondratev has pointed out on https://github.com/apache/wicket/pull/255, we can use FormData to send multipart data via Ajax. This makes the current iframe workaround obsolete.

Advantages:

• real Ajax !!1!!!
• we can drop a lot of code in wicket-ajax-jquery.js
• users can use Wicket.Ajax to send files as extra parameters, as requested in pull request #255

FormData is supported in Edge and IE 10. I'm not sure whether we still support older browsers, but as fallback users can

• continue using Wicket 7 (supported for the next years)
• switch to non-Ajax uploads
• use a polyfill for FormData (several available on github)

Issue Links

• causes: WICKET-6868 UploadProcessBar doesn't work anymore with AjaxFormSubmitBehaviour("change") out of the box
• relates to: WICKET-2420 Ajax support for multipart forms
• links to: GitHub Pull Request #256
• mentioned in: Page Loading...