GWT JSNI-如何使用JSNI從Java代碼調用外部JavaScript

Question

我想在我的gwt應用程序中調用外部javascript函數

當我使用此代碼時，它工作正常：我已經導入了JavaScript，並且可以在客戶端的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
                                                )


                                                }-*/;

但是當我remvoe

alert("ff");

它拋出此異常：

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)

請幫我，

提前致謝

Answer 1

確保在 .nocache.js 之前將腳本與createPluginMap函數鏈接，並且不要異步鏈接（我的意思是應該沒有<script defer或<script async ）

Answer 2

我認為這是一個競爭條件，而您所期望的功能createPluginMap不存在。

嘗試更換

alert("ff");

同

alert(''+!!$wnd.createPluginMap);

如果您在警報中得到“假”，這就是原因。 如果為真，我將嘗試考慮其他答案;）