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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BottomNavigation] Calling js method onSelectedPositionChange failed","articleBody":"### Tell us about the problem\r\n```\r\nJS: ERROR TypeError: Cannot read property 'length' of undefined\r\nSystem.err: An uncaught Exception occurred on \"main\" thread.\r\nSystem.err: Calling js method onSelectedPositionChange failed\r\nSystem.err: TypeError: Cannot read property 'android' of undefined\r\nSystem.err: \r\nSystem.err: StackTrace:\r\nSystem.err: push.../node_modules/tns-core-modules/ui/bottom-navigation/bottom-navigation.js.BottomNavigation.setTabBarItemColor(file:///node_modules/tns-core-modules/ui/bottom-navigation/bottom-navigation.js:496:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/tab-navigation-base/tab-strip-item/tab-strip-item.js:68:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/data/observable/observable.js.Observable.notify(file:///node_modules/tns-core-modules/data/observable/observable.js:110:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/core/properties/properties.js:852:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/core/properties/properties.js:862:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/tab-navigation-base/tab-strip-item/tab-strip-item.js.TabStripItem.eachChild(file:///node_modules/tns-core-modules/ui/tab-navigation-base/tab-strip-item/tab-strip-item.js:120:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/core/properties/properties.js:857:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/styling/style-scope.js.CssState.setPropertyValues(file:///node_modules/tns-core-modules/ui/styling/style-scope.js:472:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/styling/style-scope.js:381:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/core/view-base/view-base.js.ViewBase._batchUpdate(file:///node_modules/tns-core-modules/ui/core/view-base/view-base.js:279:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/styling/style-scope.js.CssState.updateDynamicState(file:///node_modules/tns-core-modules/ui/styling/style-scope.js:379:0)\r\nSystem.err: \tat CssState._onDynamicStateChangeHandler(file:///node_modules/tns-core-modules/ui/styling/style-scope.js:328:57)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/data/observable/observable.js.Observable.notify(file:///node_modules/tns-core-modules/data/observable/observable.js:110:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/core/view-base/view-base.js.ViewBase.notifyPseudoClassChanged(file:///node_modules/tns-core-modules/ui/core/view-base/view-base.js:319:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/core/view-base/view-base.js.ViewBase.deletePseudoClass(file:///node_modules/tns-core-modules/ui/core/view-base/view-base.js:345:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/ui/core/view-base/view-base.js.ViewBase._goToVisualState(file:///node_modules/tns-core-modules/ui/core/view-base/view-base.js:595:0)\r\nSystem.err: \tat (file:///node_modules/tns-core-modules/ui/tab-navigation-base/tab-strip-item/tab-strip-item.js:151:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/data/observable/observable.js.Observable.notify(file:///node_modules/tns-core-modules/data/observable/observable.js:110:0)\r\nSystem.err: \tat push.../node_modules/tns-core-modules/data/observable/observable.js.Observable._emit(file:///node_modules/tns-core-modules/data/observable/observable.js:127:0)\r\nSystem.err: \tat BottomNavigationBarImplementation.onSelectedPositionChange(file:///node_modules/tns-core-modules/ui/bottom-navigation/bottom-navigation.js:87:0)\r\nSystem.err: \tat com.tns.Runtime.callJSMethodNative(Native Method)\r\nSystem.err: \tat com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1286)\r\nSystem.err: \tat com.tns.Runtime.callJSMethodImpl(Runtime.java:1173)\r\nSystem.err: \tat com.tns.Runtime.callJSMethod(Runtime.java:1160)\r\nSystem.err: \tat com.tns.Runtime.callJSMethod(Runtime.java:1138)\r\nSystem.err: \tat com.tns.Runtime.callJSMethod(Runtime.java:1134)\r\nSystem.err: \tat com.tns.gen.org.nativescript.widgets.BottomNavigationBar_vendor_123976_32_BottomNavigationBarImplementation.onSelectedPositionChange(BottomNavigationBar_vendor_123976_32_BottomNavigationBarImplementation.java:39)\r\nSystem.err: \tat org.nativescript.widgets.BottomNavigationBar.setSelectedPosition(BottomNavigationBar.java:274)\r\nSystem.err: \tat org.nativescript.widgets.BottomNavigationBar$TabClickListener.onClick(BottomNavigationBar.java:287)\r\nSystem.err: \tat android.view.View.performClick(View.java:6663)\r\nSystem.err: \tat android.view.View.performClickInternal(View.java:6635)\r\nSystem.err: \tat android.view.View.access$3100(View.java:794)\r\nSystem.err: \tat android.view.View$PerformClick.run(View.java:26199)\r\nSystem.err: \tat android.os.Handler.handleCallback(Handler.java:907)\r\nSystem.err: \tat android.os.Handler.dispatchMessage(Handler.java:105)\r\nSystem.err: \tat android.os.Looper.loop(Looper.java:216)\r\nSystem.err: \tat android.app.ActivityThread.main(ActivityThread.java:7625)\r\nSystem.err: \tat java.lang.reflect.Method.invoke(Native Method)\r\nSystem.err: \tat com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)\r\nSystem.err: \tat com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)\r\n```\r\n\r\n### Which platform(s) does your issue occur on?\r\nAndroid\r\n\r\n### Please provide the following version numbers that your issue occurs with:\r\n```\r\n[{\r\n  \"nativescript\": {\r\n    \"id\": \"org.nativescript.mrsincoquiz\",\r\n    \"tns-android\": {\r\n      \"version\": \"6.2.0\"\r\n    },\r\n    \"tns-ios\": {\r\n      \"version\": \"6.1.0\"\r\n    }\r\n  },\r\n  \"description\": \"NativeScript Application\",\r\n  \"license\": \"SEE LICENSE IN \u003cyour-license-filename\u003e\",\r\n  \"repository\": \"\u003cfill-your-repository-here\u003e\",\r\n  \"scripts\": {\r\n    \"lint\": \"tslint \\\"src/**/*.ts\\\"\"\r\n  },\r\n  \"dependencies\": {\r\n    \"@angular/animations\": \"~8.2.0\",\r\n    \"@angular/common\": \"~8.2.0\",\r\n    \"@angular/compiler\": \"~8.2.0\",\r\n    \"@angular/core\": \"~8.2.0\",\r\n    \"@angular/forms\": \"~8.2.0\",\r\n    \"@angular/platform-browser\": \"~8.2.0\",\r\n    \"@angular/platform-browser-dynamic\": \"~8.2.0\",\r\n    \"@angular/router\": \"~8.2.0\",\r\n    \"json-object-mapper\": \"^1.6.0\",\r\n    \"nativescript-angular\": \"~8.2.0\",\r\n    \"nativescript-localstorage\": \"^1.1.5\",\r\n    \"nativescript-material-cardview\": \"^2.5.4\",\r\n    \"nativescript-theme-core\": \"~1.0.6\",\r\n    \"reflect-metadata\": \"~0.1.12\",\r\n    \"rxjs\": \"^6.4.0\",\r\n    \"tns-core-modules\": \"^6.1.2\",\r\n    \"zone.js\": \"~0.9.1\"\r\n  },\r\n  \"devDependencies\": {\r\n    \"@angular/compiler-cli\": \"~8.2.0\",\r\n    \"@ngtools/webpack\": \"~8.2.0\",\r\n    \"codelyzer\": \"~4.5.0\",\r\n    \"nativescript-dev-webpack\": \"~1.2.0\",\r\n    \"node-sass\": \"^4.7.1\",\r\n    \"tslint\": \"~5.19.0\",\r\n    \"typescript\": \"~3.5.3\"\r\n  },\r\n  \"gitHead\": \"1964ea9e8ca1a0518e0d6370781eedcf6c23db42\",\r\n  \"readme\": \"NativeScript Application\"\r\n}]\r\n\r\n```\r\n\r\n### Please tell us how to recreate the issue in as much detail as possible.\r\nWhen change tab position.\r\n\r\n### Is there code involved? If so, please share the minimal amount of code needed to recreate the problem.\r\n[Archivo.zip](https://github.com/NativeScript/nativescript-ui-feedback/files/3799178/Archivo.zip)\r\n","author":{"url":"https://github.com/nericode","@type":"Person","name":"nericode"},"datePublished":"2019-11-01T18:42:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/8057/NativeScript/issues/8057"}