First, what I'm trying to do:
I've got a page with lots of hyperlinks on it (plain-old <a href=...>
tags).
When the user shift-clicks on links that match a certain pattern
(e.g. /author/AUTHOR_IDENTIFIER), I popup a dialog box that lets them
perform an edit INSTEAD of following the link.
In GWT 1.5, I did this:
public void onModuleLoad() {
...
DOM.addEventPreview
(this);
}
//
// look for shift-clicks on paper/author links, and pops
up
// edit dialog
boxes:
//
public boolean onEventPreview(Event event) {
if (DOM.eventGetType(event) != Event.ONCLICK) { return true; }
if (!event.getShiftKey()) { return true; }
Element e = event.getTarget();
String href = e.getAttribute("href");
if (href == null || href.length() == 0){ return true; }
if (href.contains("/paper/")) {
String paperPID = InterfaceUtils.getPIDFromLinkString(href,
"paper/");
fetchPaperInfoThenEdit(paperPID);
return false;
}
else if (href.contains("/author/")) {
String authorPID = InterfaceUtils.getPIDFromLinkString(href,
"author/");
Map<String,String> params = InterfaceUtils.parseURLParams(href);
fetchAuthorInfoThenEdit(authorPID, params.get("fromPaper"));
return false;
}
return true;
}
In 1.6, I've rewritten the code to use onPreviewNativeEvent(), but
it's not working; if I cancel() or consume() (or both) the
NativePreviewEvent, the browser STILL follows the link. My ported
code looks like this:
public void onModuleLoad() {
...
Event.addNativePreviewHandler(this);
}
//
// Preview events-- look for shift-clicks on paper/author links, and
pops up
// edit dialog boxes:
//
public void onPreviewNativeEvent(Event.NativePreviewEvent pe) {
NativeEvent e = pe.getNativeEvent();
if (Event.getTypeInt(e.getType()) != Event.ONCLICK) { return; }
if (!e.getShiftKey()) { return; }
EventTarget target = e.getEventTarget();
if (!Element.is(target)) { return; }
Element elt = Element.as(target);
String href = elt.getAttribute("href");
if (href == null || href.length() == 0){ return; }
if (href.contains("/paper/")) {
pe.consume();
pe.cancel();
String paperPID = InterfaceUtils.getPIDFromLinkString(href,
"paper/");
fetchPaperInfoThenEdit(paperPID);
}
else if (href.contains("/author/")) {
pe.consume();
pe.cancel();
String authorPID = InterfaceUtils.getPIDFromLinkString(href,
"author/");
Map<String,String> params = InterfaceUtils.parseURLParams(href);
fetchAuthorInfoThenEdit(authorPID, params.get("fromPaper"));
}
}
What am I missing?
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