Issue with WebView.EvaluateJavaScript in Android Xamarin -


i using following code injecting java script in android web view

webview

webview = findviewbyid<webview> (resource.id.learningwebview); if (null != webview) {     webview.settings.javascriptenabled = true;     webview.settings.setsupportzoom (true);     webview.setwebviewclient (new customwebviewclient ());   }

webview client implementation

public class customwebviewclient : webviewclient {     public override bool shouldoverrideurlloading (webview view, string url)     {         view.loadurl (url);         return true;     }      public override void onpagestarted (webview view, string url, android.graphics.bitmap favicon)     {      }      public override void onpagefinished (webview view, string url)     {         base.onpagefinished (view, url);         hidelearningdivs (view);     }       void hidelearningdivs (webview view)     {         try {              view.evaluatejavascript ("document.getelementbyid(\"suitebar\").parentnode.style.display='none'", new javascriptresult ());         } catch (exception ex) {             console.writeline (ex.message);         }      }

ivaluecallback implementation

public class javascriptresult :  ivaluecallback {     public intptr handle {         get;         set;     }      public void dispose ()     {      }        public void onreceivevalue (java.lang.object result)     {      } }

but during time of executing application getting following error.

java.lang.nosuchmethoderror: no method name='evaluatejavascript' signature='(ljava/lang/string;landroid/webkit/valuecallback;)v' in class landroid/webkit/webview;

can please me find wrong implementation.

i link found answer below, need check android kitkat (4.4), since function not introduced until then. if device running lower 4.4, may need different value if need it. such using hybrid webview of kind (check out xamarin forms labs version of perhaps) and/or using addjavascriptinterface()

here code:

if(android.os.build.version.sdkint >= android.os.buildversioncodes.kitkat) {     webview.evaluatejavascript("javascript:goback();", null); } else {     webview.loadurl("javascript:goback();"); }

https://forums.xamarin.com/discussion/24894/webview-evaluatejavascript-issues

*edit: since writing this, found excellent post adam pedley (who apparently have been linking lot lately) covers doing xamarin forms mentions change in android 4.2 js engine. running javascript might work first time sets document object script result, may need assign result of document.getelementbyid() variable in order work around this: var x = document.getelementbyid().


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more