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Java Rich Internet Applications Guide > Applet Developer's Guide > Applet Status and Event Handlers

Beginning in the Java SE 7 release, you can check the value of the status variable of an applet while it is being initialized. This check is non-blocking and immediately returns the status of the applet. You can explicitly check the status of the applet while it is loading and perform relevant actions or register event handlers that will automatically be invoked during various stages of applet initialization. The applet should be deployed with the java_status_events parameter set to true in order to use this functionality. See the Handling Initialization Status With Event Handlers topic in the Java Tutorials for step by step instructions and an example.

Applet Status

The following table displays the meaning of values returned by the status method of the applet.

Applet Event Handlers

You can register event handlers for various events. The Java Plug-in software will invoke these event handlers at various stages of the applet loading process. The following table describes applet events for which event handlers can be registered.

You can register or determine an event handler in the JavaScript code of a web page as shown in the following code snippets.

// use an anonymous function
applet.onLoad(function() {
  //event handler for ready state
}

// use a regular function
function onLoadHandler() {
  // event handler for ready state
}

// Use method form
applet.onLoad(onLoadHandler);

// Use attribute form
applet.onLoad = onLoadHandler;

// get current event handler
var handler = applet.onLoad