stringByEvaluatingJavascriptFromString (iOS method, what is Android equivalent?)

Question

In an iOS app, I used

stringFromJavaScript = [webView stringByEvaluatingJavascriptFromString:@\"document.getElementById(\\\"image\\\").getAttribute(\\\"src\         


        

Answer 1

Yeah, I miss this method greatly in Android ;)

To execute JavaScript and get response you can do as follows:

1. Define JavaScript callback interface in your code:

   class MyJavaScriptInterface {
       @JavascriptInterface
       public void someCallback(String jsResult) {
            // your code...
       }
   }
   

2. Attach this callback to your WebView

   MyJavaScriptInterface javaInterface = new MyJavaScriptInterface();
   yourWebView.addJavascriptInterface(javaInterface, "HTMLOUT");
   

3. Run your JavaScript calling window.HTMLOUT.someCallback from the script:

   yourWebView.loadUrl("javascript:( function () { var resultSrc = document.getElementById(\"image\").getAttribute(\"src\"); window.HTMLOUT.someCallback(resultSrc); } ) ()");
   

Hope this helps!