ZK MVC : how can i wait till the compose of another componant

asked 2014-05-28 15:08:13 +0800

elmetni gravatar image elmetni
145 7

updated 2014-05-28 16:38:30 +0800

hello , i m working on a ZK project , using ZK MVC approach. what i did try to do is to initalize "a panel" after doAfterCompose a div , but the problem is that i got a "java.lang.NullPointerException"

java.lang.NullPointerException dashboard.display.doAfterCompose(display.java:24) dashboard.display.doAfterCompose(display.java:1)

and those are a simple exemple of what i did try to do . My view "mypage.zul"

     <west width="140px" splittable="true" collapsible="true" maxsize="140">
        <div align="center" apply="dashboard.display">
                    <label value="WorkLoad"></label><checkbox></checkbox>

     <center autoscroll="true"  >
        <portallayout id="portalLayout" maximizedMode="whole" width="100%" >

            <portalchildren   >
                  <panel  id="panelworkload"   >
                            <div width="100%"  >
                            <charts  id="workloadDay" type="column" />


My conroler : "display"

public class display extends SelectorComposer<Div>{

Checkbox  objectif_checkbox;

Panel  panelworkload;

public void doAfterCompose(Div comp) throws Exception {

    panelworkload.setTitle("hello workload");


and this is the exception that i got

java.lang.NullPointerException dashboard.display.doAfterCompose(display.java:24) dashboard.display.doAfterCompose(display.java:1) org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:578) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:880) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699)

what i have throught of it so far is that the div has been composed before the portallayout , that why the server cant reconize portallayout when div is created

can anyone help me pls ? i m kinda stuck here ...and thank you

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hello mhj , sry i cant comment on ur post yet so i will put my replay here :) ya i have noticed it and i corrected it , it still give me the same exception , this s not my realy project i wrote this simple example to decript my case i dont know really what i have done wrong .

elmetni ( 2014-05-28 16:43:01 +0800 )edit

i edit the post , u can try the code source to see if you can find something about it , and thank you so much

elmetni ( 2014-05-28 16:43:35 +0800 )edit

3 Answers

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answered 2014-05-29 02:46:55 +0800

mhj gravatar image mhj flag of Brazil
806 1 7

I believe your problem is that the panel is not in the div's hierarchy, look what happens in zkfiddle: link

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answered 2014-05-28 16:36:23 +0800

mhj gravatar image mhj flag of Brazil
806 1 7

Hello elmetni, i saw that you declared differents names for panelworkload (panelworkload on zul and panelworkloadday on java) maybe that helps you...

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answered 2014-05-29 14:52:24 +0800

elmetni gravatar image elmetni
145 7

updated 2014-05-29 14:53:05 +0800

Ya exactly , i solved the problem by adding another doAfterCompose methode to wait till initialisation of panel . the code source was something like this

SelectorComposer<Panel> s = new SelectorComposer<Panel>();


thank you bro for pointing to the problem

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Asked: 2014-05-28 15:08:13 +0800

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Last updated: May 29 '14

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