package egtry.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.dom.client.Element; import com.google.gwt.dom.client.InputElement; import com.google.gwt.user.client.DOM; public class ClientApp1 implements EntryPoint { public void onModuleLoad() { updateSum(); registerFunctions(); } public static native void info(String msg) /*-{ $wnd.alert(msg); }-*/; public static native void registerFunctions() /*-{ $wnd.updateSum=$entry(@egtry.client.ClientApp1::updateSum()); }-*/; public static void updateSum() { InputElement num1=(InputElement)(Element)DOM.getElementById("num1"); InputElement num2=(InputElement)(Element)DOM.getElementById("num2"); InputElement result=(InputElement)(Element)DOM.getElementById("result"); int sum=Integer.parseInt(num1.getValue())+Integer.parseInt(num2.getValue()); result.setValue(""+sum); } }
<html> <head> <script type="text/javascript" language="javascript" src="clientapp1/clientapp1.nocache.js"></script> </head> <body> <h1>implement the javascript event handler in java </h1> num1: <input id="num1" type="text" value="12" onchange="updateSum()" /> num2: <input id="num2" type="text" value="34" onchange="updateSum()" /> result: <input id="result" type="text" disabled=1 value="" /> </body> </html>