I'm using this pattern to implement complex dynamic tooltips.
My problem is that my "tooltip calculation code" can return "no tooltip". How do I prevent the popup from showing in this case?
I tried to call popup.close() in the ON_OPEN event listener but that causes the popup to flicker.
Read the last part of RobertPic's writing how he does handle the popup. Seems meantime he create a MyPopup class that extends from GenericForwardComposer. In this case you can check if data exists in the doAfterCompose() method. If there is no data to shown you can call a myPopup.detach(). So it sould not flicker.
best Stephan
why can't you just decide to show or not before calling show()?
if you can't, you can post a event after call popup.open(). and the listener (I guess it is the popup itself) can listen to the event to call close.
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<zk>
<zscript>
void show(Component comp,String text){
helptext.setContent(text);
help.open(comp);
Events.postEvent(help,new Event("onShowCheck"));
}
void onShowCheck(){
if(org.zkoss.lang.Strings.isEmpty(helptext.getContent())){
help.close();
}
}
</zscript>
<hbox>
<button label="show1" onClick='show(self,"Show me")'/>
<button label="show2" onClick='show(self,null)'/>
</hbox>
<popup id="help" onShowCheck="onShowCheck()">
<html id="helptext"/>
</popup>
</zk>
Asked: 2013-02-25 15:57:09 +0800
Seen: 40 times
Last updated: Feb 26 '13