未捕获的ReferenceError：myFunction是不是空定义为：在web视图1的Android异常 [英] Uncaught ReferenceError: myFunction is not defined at null:1 Android exception in webview
问题描述
我打电话从活动中的JavaScript功能，但我正在逐渐未捕获的ReferenceError：1 错误：myFunction是不是空定义。下面是我的文件
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
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的
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>
我已经看到了，当我使用 webview.loadUrl发生这个错误（JavaScript的：myFunction的（））; 。我想通过从Java XML字符串并解析它为JavaScript。请帮我找到一个解决方案。
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.
推荐答案
在加载页面时，您应该执行JavaScript
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()");
}
});
在code会被执行，会发现你的JavaScript功能。你现在正在做的方式不会等待。
The code will be executed and will find your javascript function. The way you are doing now does not wait.
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