In the onchange event for the combobox

set "Do no validate or update data", this results in immediate="true",

then use getComponent("comboBox1").getSubmittedValue() to get the value of comboBox1

 

this gives you code for the eventhandler of the onchange event for the combobox like

 

<xp:eventHandler event="onchange" submit="true"
                                    refreshMode="partial" immediate="true" refreshId="xxx"
                                    id="eventHandler1">
      <xp:this.action>

                                <![CDATA[#{javascript:viewScope.rksoort = getComponent("comboBox1").getSubmittedValue();
                                sessionScope.soort=viewScope.rksoort;}]]>

      </xp:this.action>
</xp:eventHandler>

Thanks Walker.  That helped heaps.

 

Cheers,

 

A 

To avoid hard coding the id of the current component, you can use this:

this.getParent().getSubmittedValue() 

 

This in the scope of the event is the event handler. The parent is the component.