Partial refresh on dynamic field binding removes values - xpages

Question

Really looking for an idea why my XPage is doing this.
I have field with a dynamic databinding:
<xp:inputText id="CORE_Input" value="#{Document[compositeData.PARA_DataBinding]}"</xp:inputText>
That works quit well until I start to hide it based on a notes formula.
Let me tell what it does: I click a checkbox in my XPage. That checkbox is running SSJS which is calling: Document.getDocument(true) to push the data from my XPage back into the notesdocument without saving it. Once that is done I can use session.evaluate("checkbox!="something"") to hide the inputText field.
It works quit well but the problem is that once I untick the checkbox the value is gone from the inputfield.
If you know a better way to use notes formulas for hiding or the reason why the inputfield is empty once it comes back would be highly appreciated. Here is an example:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core" xmlns:xe="http://www.ibm.com/xsp/coreex">
<xp:checkBox id="checkBox1" value="#{Document.Check}" text="hide" checkedValue="hide">
<xp:eventHandler event="onchange" submit="false">
<xp:this.script><![CDATA[document.getElementById("#{id:hide}").click()]]></xp:this.script>
</xp:eventHandler>
</xp:checkBox>
<xp:panel id="test">
<xp:inputText id="CORE_Input" type="#{compositeData.NODE}"
value="#{Document[compositeData.PARA_DataBinding]}"
defaultValue="#{javascript:compositeData.PARA_DefaultValue}" style="margin-left:24px">
<xp:this.styleClass><![CDATA[#{javascript:DOMElement.getAttribute("stylesize");}]]></xp:this.styleClass> <xp:this.rendered><![CDATA[#{javascript:var doc:NotesXspDocument=Document;
var erg=session.evaluate('Check="hide"',doc.getDocument());
if(#Text(erg)=="1")
{return false}
else
{return true}}]]></xp:this.rendered>
</xp:inputText>
<xp:button value="hide" id="hide">
<xp:eventHandler event="onclick" submit="true"
refreshMode="partial" refreshId="test">
<xp:this.action>
<![CDATA[#{javascript:var doc:NotesXspDocument=Document;doc.getDocument(true)}]]></xp:this.action>
</xp:eventHandler></xp:button>
<xp:button value="unhide" id="unhide">
<xp:eventHandler event="onclick" submit="true" refreshMode="partial" refreshId="test">
<xp:this.action><![CDATA[#{javascript:sessionScope.hide=""}]]></xp:this.action>
</xp:eventHandler></xp:button>
</xp:panel></xp:view>

Answer 1

The problem you have is your default value: As soon the component is unhidden, the value is recalculated. You have to check if the component is partially refreshed. If so, stop the recalculation:
<xp:this.defaultValue>
<![CDATA[#{javascript:
importPackage( com.ibm.xsp.ajax );
if( AjaxUtil.isAjaxPartialRefresh(facesContext) == true )
return;
compositeData.PARA_DefaultValue
}]]>
</xp:this.defaultValue>
This should solve your problem