[WICKET-4464] AbstractTransformerBehavior breaks ajax requests in IE8

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.4.20
• Component/s: wicket
• Labels: Ajax IE WICKET-3633
• Assignee: Unassigned
• Reporter: Robert Keller
• Created: 22/Mar/12 08:42
• Updated: 23/Jul/12 14:19
• Resolved: 23/Jul/12 14:19

Description

AbstractTransformerBehavior sets ´webResponse.setContentType("text/" + getMarkupType(component) + "; charset=" + encoding);´

This delegates to the page and in our case usually returns "text/html".

In ajax-request this overwrites the required setting for ajax "text/xml". If IE8 receives an ajax-response as "text/html" then in wicket-ajax.js:1049 the xmldoc = t.responseXml is null and the error is:
"ERROR: Wicket.Ajax.Call.failure: Error while parsing response: Could not find root <ajax-response> element".

This error was created by https://issues.apache.org/jira/browse/WICKET-3633.

Possible un-/fixes:

• Changing the markuptype on page level to "xml" in ajaxrequests might break functionality.
  + let only AbstractTransformerBehavior consider ajaxrequests and then set xml
  + at least: make org.apache.wicket.markup.html.border.MarkupComponentBorder.getMarkupType(Component) protected and not final!