exception - 托管模式下的 GWT Javascript 异常 : Result of expression 'doc.getBoxObjectFor' [undefined] is not a function

Question

有人见过这个异常吗？我在 Mac 上的 GWT 1.6.4 上以托管模式运行。我正在使用 AutoSuggest，它在尝试显示弹出窗口时抛出此异常。它在编译模式下工作得很好，但显然托管模式相当重要。

[ERROR] Uncaught exception escaped
com.google.gwt.core.client.JavaScriptException: (TypeError): Result of expression 'doc.getBoxObjectFor' [undefined] is not a function.
 line: 71
 sourceId: 1152617088
 sourceURL: jar:file:/Users/holmes/.m2/repository/com/google/gwt/gwt-user/1.6.4/gwt-user-1.6.4.jar!/com/google/gwt/dom/client/DOMImplMozillaOld.java
 expressionBeginOffset: 288
 expressionCaretOffset: 307
 expressionEndOffset: 313
    at com.google.gwt.dom.client.DOMImplMozillaOld.getAbsoluteLeftImpl(Native Method)
    at com.google.gwt.dom.client.DOMImplMozillaOld.getAbsoluteLeft(DOMImplMozillaOld.java:29)
    at com.google.gwt.dom.client.Element$.getAbsoluteLeft$(Element.java:86)
    at com.google.gwt.user.client.DOM.getAbsoluteLeft(DOM.java:646)
    at com.google.gwt.user.client.ui.UIObject.getAbsoluteLeft(UIObject.java:487)
    at com.google.gwt.user.client.ui.PopupPanel.position(PopupPanel.java:1015)
    at com.google.gwt.user.client.ui.PopupPanel.access$5(PopupPanel.java:958)
    at com.google.gwt.user.client.ui.PopupPanel$1.setPosition(PopupPanel.java:811)
    at com.google.gwt.user.client.ui.PopupPanel.setPopupPositionAndShow(PopupPanel.java:700)
    at com.google.gwt.user.client.ui.PopupPanel.showRelativeTo(PopupPanel.java:809)
    at com.google.gwt.user.client.ui.SuggestBox.showSuggestions(SuggestBox.java:768)
    at com.google.gwt.user.client.ui.SuggestBox.access$3(SuggestBox.java:738)
    at com.google.gwt.user.client.ui.SuggestBox$1.onSuggestionsReady(SuggestBox.java:281)
    at com.google.gwt.user.client.ui.MultiWordSuggestOracle.requestSuggestions(MultiWordSuggestOracle.java:225)
    at com.google.gwt.user.client.ui.SuggestBox.showSuggestions(SuggestBox.java:640)
    at com.google.gwt.user.client.ui.SuggestBox.refreshSuggestions(SuggestBox.java:713)
    at com.google.gwt.user.client.ui.SuggestBox.access$6(SuggestBox.java:705)
    at com.google.gwt.user.client.ui.SuggestBox$1TextBoxEvents.onKeyUp(SuggestBox.java:678)
    at com.google.gwt.event.dom.client.KeyUpEvent.dispatch(KeyUpEvent.java:54)
    at com.google.gwt.event.dom.client.KeyUpEvent.dispatch(KeyUpEvent.java:1)
    at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.fireEvent(HandlerManager.java:65)
    at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.access$1(HandlerManager.java:53)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:178)
    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:52)
    at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent(DomEvent.java:116)
    at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:90)
    at com.google.gwt.user.client.ui.TextBoxBase.onBrowserEvent(TextBoxBase.java:193)
    at com.google.gwt.user.client.ui.Composite.onBrowserEvent(Composite.java:54)
    at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1320)
    at com.google.gwt.user.client.DOM.dispatchEventAndCatch(DOM.java:1299)
    at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1262)

Answer 1

在编译模式下使用 Firefox 3.7a1pre(“Minefield”)时，我遇到了类似的问题。函数 getBoxObjectFor 已替换为 getBoundingClientRect。这是我让 GWT 再次工作的解决方法。只需在开头的某个地方调用以下方法即可，至少对我来说它确实有效。

private static native void firefox3compatibility() /*-{
 if (!$doc.getBoxObjectFor) {
  $doc.getBoxObjectFor = function (element) {
   var box = element.getBoundingClientRect();
   return { "x"      : box.left,  "y"       : box.top,
            "screenX": box.left,  "screenY" : box.top,
            "width"  : box.width, "height"  : box.height };
  }
 }
}-*/;