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var strNum = document.getElementById(“numstring”);
strNum.value = req.responseText;
}
}
}
function clear(){
var num = document.getElementById(“num”);
num.value = “”;
}
function focusIn(){
document.getElementById(“num”).focus( );
}
</script>
</head>
<body onload=”focusIn();”>
Enter the Number here: <input type=”text” id=”num” name=”num”
onkeyup=”convertToString();”>
<br><br>
Equivalent String: <input type=”text” size=”20" readonly id=”numstring”>
</body>
</html>
The above html page has input text field of id “num” with “onkeyup” attribute that is set to the
JavaScript function “convertToString()”. This method is called each time the user release the key
up.
“convertToString ()” first tries to get HTTP request object maintaining the browser compatibility.
In this example, this object is stored in the variable named “xmlHttp”. Read
how to get HTTP request object on page 12
Next step is to determine which method should be invoked after getting the response from the
server. In this example, the method “callback ()” is assigned for this purpose. Now the request for
servlet “AJAXResponseServlet” is forwarded to the server along with number as parameter.
AJAXResponseServlet.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
public class AJAXResponseServlet extends HttpServlet {
public void doGet( HttpServletRequest request, HttpServletResponse response ) throws
ServletException, IOException {
String number = request.getParameter(“num”);
String strRepr = null;
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Apr
2008 | Java Jazz Up |28 |
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