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POJavaScript call to Java Applet method does not work only in Chrome browser
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  1. POJavaScript call to Java Applet method does not work only in Chrome browser
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    copied!<p>I'm trying to run a small test of an applet to call a JavaScript method and vice-versa. The code works fine in IE 9.0 and Firefox 17.0, but does not work in Chrome 23.0.1271.91 m.</p> <p>I'm not sure if it is a problem of this specific version of Chrome , but I guess not.</p> <p>Basically, I have a main HTML page, that declares the applet using an 'object' tag, and also with a 'iframe' tag. In another file, I have a HTML page that will be loaded in the iframe from the main page, but commanded by the applet.</p> <p>In the main.html file I'm using 'object' tag instead of 'applet' to be compliant with HTML5. I know this test should work using 'applet' tag, but use the 'applet' tag is exactly what I'm trying to avoid.</p> <p>The applet code:</p> <pre><code>package tests.javaplugin; import java.applet.Applet; import java.util.*; import netscape.javascript.JSObject; public class PluginTestApplet extends Applet { private static final long serialVersionUID = 492358995598940846L; private static Timer theTimer = new Timer(true); private static JSObject theWindow; @Override public void init() { System.out.println("entering init()"); theWindow = JSObject.getWindow(this); System.out.println("exiting init()"); } public void loadComplete() { System.out.println("calling loadComplete()"); theTimer.schedule(new ShowPageTimerTask(), 100); System.out.println("returning loadComplete()"); } public int getRandomInteger() { System.out.println("calling getRandomInteger()"); final int random = (int) Math.abs(Math.random() * 100); System.out.println("returning getRandomInteger(): " + random); return random; } private class ShowPageTimerTask extends TimerTask { @Override public void run() { System.out.println("entering ShowPageTimerTask.run()"); theWindow.call("showPage", new String[] { "./page.html" }); System.out.println("exiting ShowPageTimerTask.run()"); } } } </code></pre> <p>The main.html code:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="windows-1252"&gt; &lt;title&gt;Testing Java Plug-in in Java 7.0&lt;/title&gt; &lt;script src="./mainControl.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onload="onBodyLoad()"&gt; &lt;!--[if !IE]&gt;--&gt; &lt;object id="applet_embed" width="0" height="0" type="application/x-java-applet;version=1.7"&gt; &lt;!--&lt;![endif]--&gt; &lt;!--[if IE]&gt; &lt;object id="applet_embed" width="0" height="0" classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"&gt; &lt;![endif]--&gt; &lt;param name="archive" value="PluginTestApplet.jar"&gt; &lt;param name="codebase" value="./"&gt; &lt;param name="code" value="tests.javaplugin.PluginTestApplet"&gt; &lt;param name="scriptable" value="true"&gt; &lt;param name="mayscript" value="true"&gt; No Java 2 SDK, Standard Edition v 1.7 support for APPLET! &lt;/object&gt; &lt;div id="principalDIV" style="position: absolute; width: 640px; height: 480px; top: 0px; left: 0px; scrolling: no; visibility: visible; z-index: 0; overflow: hidden; leftmargin=0px; topmargin=0px; background-color: #000000"&gt; &lt;iframe id="ifPrincipal" style="position: absolute; width: 100%; height: 100%; visibility: visible; scrolling: no; overflow-x: hidden; overflow-y: hidden;"&gt; &lt;/iframe&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The mainControl.js code:</p> <pre><code>function getApplet() { return document.getElementById("applet_embed"); } function onBodyLoad() { getApplet().loadComplete(); } function getRandomInteger() { return getApplet().getRandomInteger(); } function showPage(aURL) { var iframePrincipal = document.getElementById("ifPrincipal"); if (iframePrincipal.src != null) { iframePrincipal.src = aURL; } else { alert("Error! iframe src = null! " + iframePrincipal.src); } } </code></pre> <p>The page.html code:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="windows-1252"&gt; &lt;title&gt;Testing Java Plug-in in Java 7.0&lt;/title&gt; &lt;script src="./control.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onload="onBodyLoad()" style="background-color: #000000; color: #ffffff; font-family: Tahoma; font-size: 35px;" &gt; &lt;div&gt;Testing dynamic HTML i-frame commanded by Java Plug-in.&lt;/div&gt; &lt;div style="float: left;"&gt;The random number is&amp;nbsp;&lt;/div&gt;&lt;div id="randomNum" style="float: left;"&gt;&amp;nbsp;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The control.js code:</p> <pre><code>function onBodyLoad() { var randomNumber = parent.getRandomInteger(); var randomNumberDiv = document.getElementById("randomNum"); randomNumberDiv.innerHTML = randomNumber; } </code></pre> <p>The console (in development tools) presents these errors:</p> <pre><code>Uncaught TypeError: Object #&lt;HTMLObjectElement&gt; has no method 'loadComplete' mainControl.js:6 Failed to load resource file:///C:/Projects/Tests/javaplugintest/tests.javaplugin.PluginTestApplet </code></pre> <p>So, there are any trick or specific parameter in 'object' tag declaration needed for Chrome?</p>
 

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