如何从JavaScript Apache Wicket调用Java函数

时间:2013-07-03 17:28:34

标签: javascript html ajax wicket wicket-1.6

我已经在很多地方研究过这个话题并找到了一些方法。在这个特定场景中,我使用https://cwiki.apache.org/confluence/display/WICKET/Calling+Wicket+from+Javascript文章作为参考。

我在Java中做了什么,

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);

    }

}

和我的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>

我尝试做的是使用我初始化的变量调用get ajax方法。但是当我的页面加载时,在firebug控制台中说,

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

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

这里出了什么问题?

还有其他从Javascript调用Java函数的好方法吗?

2 个答案:

答案 0 :(得分:1)

您需要添加wicket javascripts添加到页面中,通常通过确保renderHead等覆盖方法进行super.renderHead调用。

答案 1 :(得分:0)

Wicket 6.x:在扩展AbstractDefaultAjaxBehavior的类中

@Override
public void renderHead(Component component, IHeaderResponse response) {
    String callbackUrl = getCallbackUrl().toString();

    StringBuffer script = new StringBuffer();
    script
            .append("var callbackUrl = '").append(callbackUrl).append("';\n")
            .append("someJavaScriptCode();\n")
            .append("Wicket.Ajax.get({u: callbackUrl});");

    response.render(OnDomReadyHeaderItem.forScript(script.toString()));
}