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How to call Java Function from JavaScript

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Hi All,

I have looked in to this topic in many places and found some ways. In this
particular scenario, I have used
https://cwiki.apache.org/confluence/display/WICKET/Calling+Wicket+from+Javascriptarticle
as the reference.

What I did in Java,

public class HomePage extends WebPage {
private static final long serialVersionUID = 1L;

public HomePage(final PageParameters parameters) {
super(parameters);

final AbstractDefaultAjaxBehavior behave = new
AbstractDefaultAjaxBehavior() {
protected void respond(final AjaxRequestTarget target) {
target.add(new Label("foo", "Yeah I was just called from
Javascript!"));

public void renderHead(Component component,IHeaderResponse
response){

String componentMarkupId = component.getMarkupId();
String callbackUrl = getCallbackUrl().toString();

response.render(JavaScriptHeaderItem.forScript("var
componentMarkupId='"+componentMarkupId+"'; var
callbackUrl='"+callbackUrl+"';","values"));

};

add(behave);

and my HomePage.html,

<!DOCTYPE HTML>
<html>
<body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js
"></script>
<script type="text/javascript">
$(function() {
var wcall = Wicket.Ajax.get({ u: '${callbackUrl}' + '' });
alert(wcall);
});
</script>
</body>
</html>

What I tried to do is call the get ajax method using the vars I have
initialized. But when my page loads, in the firebug console it says,

ReferenceError: Wicket is not defined
[Break On This Error]

var wcall = Wicket.Ajax.get({ u: '${callbackUrl}' + '' });

What has gone wrong here ?

Is there any other good way to call Java Function from Javascript?

Thanks!

Blog - http://www.insightforfuture.blogspot.com/
LinkedIn - http://www.linkedin.com/pub/andun-s-l-gunawardana/34/646/703
Twitter -http://twitter.com/AndunSLG

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