Xpages #Dblookup does not work on server - xpages

Question

I write a xpages.
detail： There are two combobox A,B. I use #Dbcolumn on combobox A to get option data from notesview and I will throw the choice I get from A to get second data for B.
the problem is： it work well on my localserver, but get no result on the server.
I'll be very appreciate for any suggestion, thanks you!!
code is on server side as follow：
var fd_AppChoice:com.ibm.xsp.component.xp.XspSelectOneMenu = getComponent("fd_AppChoice");
var AppChoice=#Trim(fd_AppChoice.getValue());
var temp=new Array();
temp=#DbLookup("","(A)",AppChoice,2);
return temp;

Answer 1

That code doesn't look right - you don't have the server. And defining a variable doesn't fix its data type, so var temp=new Array(); is irrelevant. I also would rather bind the fd_AppChoice to a scope variable e.g. viewScope.appChoice, then your code get easier. Try this:
var appChoice = #Trim(viewScope.appChoice); // Use getComponent.getValue if you have to
var server = #DbName();
// if different server or nsf have = ["myserver","mydb.nsf"] or [#DbName()[0],"my.nsf"]
var result = #DbLookup(server,"(A)",appChoice,2);
return result || ["Sorry nothing here"]
That should work

Answer 2

I can't quite confirm this: in my case it works like a charm on my test server (didn't even try locally). Here's my code:
comboBox #1 reads its values from a categorized view of the same database:
<xp:comboBox id="comboBox1" value="#{viewScope.combo1}">
<xp:selectItems>
<xp:this.value>
<![CDATA[#{javascript:#DbColumn(#DbName(), "myView", 1);}]]>
</xp:this.value>
</xp:selectItems>
<xp:eventHandler event="onchange" submit="true" refreshMode="partial" refreshId="panelC2">
</xp:eventHandler>
</xp:comboBox>
Observe that the combo's onchange event performs a partial update on a panel which is a container for comboBox #2 (could it be that this is missing in your case?)
To get through with this, here's the remainder: combo#2 gets its values array using a #DbLookup which is filtered by the value selected in combo#1, which now is stored in a viewScope variable (how couldn't I agree with Stephan here: using a scope-var make things much easier!):
<xp:panel id="panelC2">
<xp:comboBox id="comboBox2" value="#{viewScope.combo2}">
<xp:selectItems>
<xp:this.value>
<![CDATA[#{javascript:#DbLookup(#DbName(), "myView", viewScope.combo1, 5);}]]>
</xp:this.value>
</xp:selectItems>
</xp:comboBox>
</xp:panel>