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Uncaught ReferenceError: MyFunction Is Not Defined At Null:1 Android Exception In Webview

- 1 answer

I am calling javascript function from an activity but I am getting Uncaught ReferenceError: myFunction is not defined at null:1 error. Here is my files

MainActivity.java

package com.example.androidexample;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        WebView webview = (WebView)this.findViewById(R.id.webView1);
        WebSettings webSettings = webview.getSettings();

        // Enable Javascript for interaction
        webSettings.setJavaScriptEnabled(true);

        // Make the zoom controls visible
        webSettings.setBuiltInZoomControls(true);

        // Allow for touching selecting/deselecting data series
        webview.requestFocusFromTouch();

        // Set the client
        webview.setWebViewClient(new WebViewClient());
        webview.setWebChromeClient(new WebChromeClient());


        //webview.loadUrl("file:///android_asset/test.html");

        /*String str = "<books>" +
                "<book title=\"A Tale of Two Cities\"/>" +
                "<book title=\"1984\"/>" +
                "</books>";*/




        webview.loadUrl("file:///android_asset/test.html");
        webview.loadUrl("javascript:myFunction()");
        //webview.loadUrl("javascript:myFunction("+str+")");

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }    
}

test.html

<html>
<body>
<script type="text/javascript" src="marknote.js"></script>
<script type="text/javascript">
function myFunction()
{
var str = '<books><book></book></books>';
var parser = new marknote.Parser();
var doc = parser.parse(str);

var bookEls = doc.getRootElement().getChildElements();

    for (var i=0; i<bookEls.length; i++) {
        var bookEl = bookEls[i];

        alert("Element name is " + bookEl.getName());
    }
}
</script>

</body>
</html>

I have seen this error occurred when I am using webview.loadUrl("javascript:myFunction()");. I want to pass a xml string from java and parse it into javascript. Please help me to find a solution.

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Answer

You should execute the javascript when the page is loaded

webview.setWebViewClient(new WebViewClient(){
    public void onPageFinished(WebView view, String url){   
        webview.loadUrl("javascript:myFunction()");
    }           
});

The code will be executed and will find your javascript function. The way you are doing now does not wait.

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source: stackoverflow.com
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