I need to check if a variable was defined in javascript and I tried
with the following native method:
private native Boolean isADefined() /*-{
return @java.lang.Boolean::valueOf(Z)($wnd.a != undefined);
}-*/;
but when it is called, the following exception is thrown:
com.google.gwt.dev.shell.HostedModeException: invoke arguments: JS
value of type int, expected boolean
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:100)
at
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:65)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
157)
at
com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:
1713)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
165)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
120)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
507)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
264)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91)
...
It seems that the boolean expression is evaluated as an integer. Other
than
private native Boolean isADefined() /*-{
if ($wnd.a != undefined) {
return @lava.lang.Boolean::TRUE;
} else {
return @lava.lang.Boolean::FALSE;
}
}-*/;
is there a (more elegant) way to call the boolean constructor with a
javascript boolean expression?
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