java - GWT JSNI - 如何使用 jsni 从 java 代码调用外部 javascript

Question

我想在我的 gwt 应用程序中调用外部 javascript 函数

当我使用此代码时，它工作正常:我已经导入了javaScript，我可以在客户端的firebug中看到它

public static native void showOfflineMap(String pRegionId, String pMapServerHost, String pMapServerPath, String pMapTileLayers, String pFoiLayers,
            double pMapCenterLon, double pMapCenterLat, int pInitZoom, String pNavPanel, boolean pCustJsFunction, int pMapWidth, int pMapHeight,
            String pAdditional) /*-{
                                alert("ff");
                                                $wnd.createPluginMap(
                                                pRegionId,
                                                pMapServerHost,
                                                pMapServerPath,
                                                pMapTileLayers,
                                                pFoiLayers,
                                                pMapCenterLon,
                                                pMapCenterLat,
                                                pInitZoom,
                                                pNavPanel,
                                                pCustJsFunction,
                                                pMapWidth,
                                                pMapHeight,
                                                pAdditional
                                                )


                                                }-*/;

但是当我删除

alert("ff");

它抛出此异常:

Sun Jul 06 16:36:49 GMT+03:30 2014 com.google.gwt.logging.client.LogConfiguration
SEVERE: (TypeError) @ir.dena.avl.client.offlinemap.MapUtil::showOfflineMap(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;DDILjava/lang/String;ZIILjava/lang/String;)([string: 'offline_map', string: 'http://192.168.10.196:7001', string: '/mapviewer', string: 'mp.LINE_TILE', string: 'NONE', double: 56.0046, double: 32.629365, int: 3, string: 'WEST', bool: false, int: 1000, int: 800, string: 'OVER:MARQUEE:DISTANCE:REDLINE:FOISELECT']): $wnd.createPluginMap is not a functioncom.google.gwt.core.client.JavaScriptException: (TypeError) @ir.dena.avl.client.offlinemap.MapUtil::showOfflineMap(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;DDILjava/lang/String;ZIILjava/lang/String;)([string: 'offline_map', string: 'http://192.168.10.196:7001', string: '/mapviewer', string: 'mp.LINE_TILE', string: 'NONE', double: 56.0046, double: 32.629365, int: 3, string: 'WEST', bool: false, int: 1000, int: 800, string: 'OVER:MARQUEE:DISTANCE:REDLINE:FOISELECT']): $wnd.createPluginMap is not a function
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:249)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:304)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
    at ir.dena.avl.client.offlinemap.MapUtil$.showOfflineMap(MapUtil.java)
    at ir.dena.avl.client.offlinemap.OfflineMapView.createMainPanel(OfflineMapView.java:31)
    at ir.jalal.core.client.view.BaseView.<init>(BaseView.java:71)
    at ir.dena.avl.client.offlinemap.OfflineMapView.<init>(OfflineMapView.java:20)
    at ir.dena.avl.client.ViewFactory$32.onSuccess(ViewFactory.java:354)
    at com.google.gwt.core.client.GWT$1.execute(GWT.java:286)
    at com.google.gwt.core.client.impl.SchedulerImpl$Task$.executeScheduled$(SchedulerImpl.java:50)
    at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:180)
    at com.google.gwt.core.client.impl.SchedulerImpl.flushPostEventPumpCommands(SchedulerImpl.java:345)
    at com.google.gwt.core.client.impl.SchedulerImpl$Flusher.execute(SchedulerImpl.java:78)
    at com.google.gwt.core.client.impl.SchedulerImpl.execute(SchedulerImpl.java:138)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:356)
    at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Unknown Source)

请帮助我，

提前致谢

Answer 1

确保将脚本链接到 createPluginMap函数之前 .nocache.js并且不会异步链接它(我的意思是它应该没有 <script defer 或 <script async )