OnLoadAjaxBehavior
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Key: WICKET-2206
URL: https://issues.apache.org/jira/browse/WICKET-2206
Project: Wicket
Issue Type: Improvement
Components: wicket
Affects Versions: 1.4-RC2
Reporter: Juha Paananen
Fix For: 1.5-M1
It would be convenient to have an OnLoadAjaxBehavior that can be used to
execute server side code when page is loaded. For instance, I'm using this to
check if the page has expired (the related user workflow has already finished).
In short, here's the code:
public abstract class OnLoadAjaxBehavior extends AbstractDefaultAjaxBehavior {
private static final long serialVersionUID = 1L;
@Override
public void renderHead(final IHeaderResponse response) {
StringBuilder javascript = new StringBuilder();
javascript.append("wicketAjaxGet('" + getCallbackUrl() + "', function()
{}, function() { });\n");
response.renderOnLoadJavascript(javascript.toString());
}
}
This leaves the respond(..) method abstract. The concrete classes will add the
server behavior in their implementations of the respond(..) method.
For me it took several hours to find out how to do this relatively simple
thing. If we had this behavior class in Wicket, it would save some time for
other n00bs.
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