Custom control inside repeat can't see rowData in one custom property, but work in other - xpages

Question

I have following custom control:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:this.beforePageLoad><![CDATA[#{javascript:compositeData.id = this.getId();
if (!compositeData.body_class) {compositeData.body_class='panel-body'};
if (!compositeData.panel_id) {compositeData.panel_id='section'+compositeData.id};}]]></xp:this.beforePageLoad>
<xp:panel>
<xp:this.styleClass><![CDATA[#{javascript:"ccSectionPanel panel " + compositeData.panel_class + ""}]]></xp:this.styleClass>
<xp:this.attrs>
<xp:attr name="id">
<xp:this.value><![CDATA[#{javascript:compositeData.panel_id}]]></xp:this.value>
</xp:attr>
</xp:this.attrs>
<xp:panel styleClass="panel-heading" style="cursor:pointer;">
<xp:this.attrs>
<xp:attr name="id">
<xp:this.value><![CDATA[#{javascript:compositeData.panel_id + "_heading"}]]></xp:this.value>
</xp:attr>
<xp:attr name="href">
<xp:this.value><![CDATA[#{javascript:"#" + compositeData.panel_id + "_section"}]]></xp:this.value>
</xp:attr>
<xp:attr name="data-toggle" value="collapse"></xp:attr>
</xp:this.attrs>
<xp:link escape="true" styleClass="panel-title"
text="#{javascript:compositeData.titleBarText}">
<xp:this.attrs>
<xp:attr name="id">
<xp:this.value><![CDATA[#{javascript:compositeData.panel_id + "_title"}]]></xp:this.value>
</xp:attr>
</xp:this.attrs>
<xp:this.id><![CDATA[${javascript:compositeData.panel_id + "_title"}]]></xp:this.id>
</xp:link>
</xp:panel>
<xp:panel>
<xp:this.styleClass><![CDATA[#{javascript:"panel-collapse collapse" + (compositeData.initClosed ? "" : " in")}]]></xp:this.styleClass>
<xp:this.attrs>
<xp:attr name="id">
<xp:this.value><![CDATA[#{javascript:compositeData.panel_id + "_section"}]]></xp:this.value>
</xp:attr>
</xp:this.attrs>
<xp:panel
styleClass="#{javascript:compositeData.body_class}">
<xp:callback facetName="panelBody" id="panelBody"></xp:callback>
</xp:panel>
<xp:panel rendered="#{javascript:compositeData.footer}"
styleClass="panel-footer">
<xp:callback facetName="panelFooter" id="panelFooter"></xp:callback>
</xp:panel>
</xp:panel>
</xp:panel>
</xp:view>
I use it in a repeat control:
<xp:repeat id="repeat1" rows="30" value="#{view1}"
var="repEntry" indexVar="index" repeatControls="false">
<xp:panel>
<xp:this.data>
<xp:dominoDocument var="doc"
action="openDocument"
documentId="#{javascript:repEntry.getNoteID()}"
ignoreRequestParams="true">
</xp:dominoDocument>
</xp:this.data>
<xc:ccSectionPanel initClosed="false"
panel_class="#{javascript:repEntry.getColumnValue('class')}"
footer="#{javascript:sessionScope.isAdmin}"
rendered="#{javascript:repEntry.getColumnValue('Status') == '1' || sessionScope.isAdmin}">
<xc:this.titleBarText><![CDATA[#{javascript:repEntry.getColumnValue('Title') + (repEntry.getColumnValue('Status') != '1' ? ' (скрыто)' : '')
}]]></xc:this.titleBarText>
<xp:this.facets>
<xp:panel xp:key="panelFooter">
<xp:button value="Редактировать"
id="button2" styleClass="btn btn-xs">
<i
class="glyphicon glyphicon-pencil">
</i>
<xp:eventHandler event="onclick"
submit="true" refreshMode="complete">
<xp:this.action>
<xp:openPage
name="/index.xsp" target="editDocument"
documentId="#{javascript:repEntry.getNoteID()}">
</xp:openPage>
</xp:this.action>
</xp:eventHandler>
</xp:button>
<xp:button
value="#{javascript:repEntry.getColumnValue('Status') != '1' ? 'Показать' : 'Скрыть'}"
id="button3" styleClass="#{javascript:'btn btn-xs'}">
<i
class="#{javascript:repEntry.getColumnValue('Status') != '1' ? 'glyphicon glyphicon-eye-open' : 'glyphicon glyphicon-eye-close'}">
</i>
<xp:eventHandler event="onclick"
submit="true" refreshMode="partial" disableValidators="true"
refreshId="content">
<xp:this.action><![CDATA[#{javascript:if (repEntry.getColumnValue('Status') == '1') {
doc.replaceItemValue('Status','0');
doc.replaceItemValue('Author',sessionScope.User.UserName);
doc.save();
} else {
doc.replaceItemValue('Status','1');
doc.replaceItemValue('Author',sessionScope.User.UserName);
doc.save();
}}]]></xp:this.action>
</xp:eventHandler>
</xp:button>
<xp:text escape="false"
id="computedField2" styleClass="btn btn-xs">
<xp:this.value><![CDATA[#{javascript:'<i class="glyphicon glyphicon-user"></i>' + repEntry.getColumnValue('Author') + ' <i class="glyphicon glyphicon-time"></i>' + repEntry.getColumnValue('$1')
}]]></xp:this.value>
</xp:text>
</xp:panel>
<xp:panel xp:key="panelBody">
<!-- <xp:this.data>
<xp:dominoDocument var="doc" action="openDocument"
documentId="#{javascript:repEntry.getNoteID()}"
ignoreRequestParams="true">
</xp:dominoDocument>
</xp:this.data> -->
<xp:inputRichText
id="inputRichText2" value="#{doc.Body}" readonly="true"
rendered="false">
</xp:inputRichText>
<xp:text escape="false"
id="computedField1">
<xp:this.value><![CDATA[#{javascript:doc.getDocument().getFirstItem("Body").getMIMEEntity().getContentAsText(); }]]></xp:this.value>
</xp:text>
</xp:panel>
</xp:this.facets>
</xc:ccSectionPanel>
</xp:panel>
</xp:repeat>
When i set cumputed properties,
It works, but when i set panel_id to something relative to repEntry or doc, it throws error (repEntry is undefined). I can set "Create controls at page creation", but then I lose advantages of partial refresh.
The main question, why one costom property can work with repEntry, but other can't?

Answer 1

The answer comes down to when the property gets calculated. Compute it and add a print statement in the SSJS code and you'll see. IDs need to be calculated when the components get loaded, so at the earliest part of the processing. And most importantly this is when it's generating a single abstract set of components, not associated to a particular row entry, because it's not yet built the collection. Think of it like creating an abstract class before creating objects from it.