<h:commandButton id="p"
                 value="#{msgs['SP.Pend.Button.Label']}"
                 type="button"
                 disabled="#{securityView.readOnlyUser or sPView.readOnly}">
    <rich:toolTip style="white-space:nowrap" value="Ctrl-Shft-P" />
    <a4j:support event="onclick"
                 oncomplete="if ((!#{sProcessorView.autoFetchNext}) &&
                                   #{sProcessorView.nonTradList.contains('100')} &&
                                   #{spProcessorView.nonTradList.contains('111')} ) openSimplePop() ;
                             else openModal();" />
</h:commandButton>

public boolean containsValue() {
   //Check if the value is in the list...
}

var showModal = #{bean.containsValue()};
if(showModal) {
   openModal();
} else openSimplePop();