GWT JSNI - how to call external javascript from java code using jsni

Question

I want to call an external javascript function in my gwt application

when i use this code it works fine : i have imported javaScript and i can see it in firebug in client side

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
                                                )


                                                }-*/;

but when i remvoe

alert("ff");

it throws this exception :

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)

please help me,

thanks in advance

Vadim · Accepted Answer · 2014-07-07 04:49:56Z

1

Make sure that you link your script with createPluginMap function before .nocache.js and doesn't link it asynchronously (I mean it should be without <script defer or <script async)

answered Jul 7, 2014 at 4:49

Vadim

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1 Comment

Jess Over a year ago

this silly mistake of having the scripts before .nocache.js held me for 4 days. Thanks

tshani · Accepted Answer · 2014-07-06 18:48:52Z

0

I assume it's a race condition and the function createPluginMap doesn't exist when you expect it be.

Try replaceing

alert("ff");

with

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

If you get 'false' in the alert, this is the reason. If true, i will try to think of a different answer ;)

answered Jul 6, 2014 at 18:48

tshani

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2 Comments

user1738224 Over a year ago

i do this ,but it still throws that exception

tshani Over a year ago

It might also be because of dev mode. Try validating this with using the final js and not dev mode. Or try using SuperDevMode: gwtproject.org/articles/superdevmode.html

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