jsf - displaying values from database on the basis of dropdown menu selction -

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hi creating jsf application . in fact made dropdown list , want display results according value selected dropdown. if can help.... thanks

here drop down

<h:form>                 <h:commandbutton action="sample?faces-redirect=true" value="submit">                     <h:selectonemenu id="samplesearch" value="#{cbean.id}">                     <f:selectitem id="id" itemlable="idtext" itemvalue="by text" />                     <f:selectitem id="idnumeric" itemlable="idnumeric" itemvalue="number" />                     <f:selectitem id="product" itemlable="product" itemvalue="main product" />                     <f:selectitem id="lonumber" itemlable="lonumber" itemvalue="lonumber" />                     <f:selectitem id="formula" itemlable="formula" itemvalue="by formula" />                     </h:selectonemenu>                 </h:commandbutton>              </h:form>

first, you're not allowed nest <h:selectonemenu> component(s) within <h:commandbutton>! here's proper structure of <h:form>

<h:form>     <h:commandbutton action="sample?faces-redirect=true" value="submit" />         <h:selectonemenu id="samplesearch" value="#{cbean.id}">             <f:selectitem id="id" itemlable="idtext" itemvalue="by text" />             <f:selectitem id="idnumeric" itemlable="idnumeric" itemvalue="number" />             <f:selectitem id="product" itemlable="product" itemvalue="main product" />             <f:selectitem id="lonumber" itemlable="lonumber" itemvalue="lonumber" />             <f:selectitem id="formula" itemlable="formula" itemvalue="by formula" />     </h:selectonemenu> </h:form>

then, in order dropdown list options database, can consider using <f:selectitems> component (and rid of <f:selectitem>s) , pass list<t> managed bean components value property.

the selectonemenu this:

<h:selectonemenu value="#{cbean.id}">     <f:selectitems value="#{cbean.values}"                     var="item"                    itemlabel="#{item.label}"                    itemvalue="#{item.value}"/> </h:selectonemenu>

as managed-bean, it's supposed provide public list<t> getvalues() method, return list objects populate dropdown.

when t complex java object, such item has string property of label , value, use var attribute hold of iteration variable in turn can use in itemvalue and/or itemlabel attribtues (if omit itemlabel, label becomes same value).

let's say:

@managedbean @requestscoped public class cbean {     public list<item> getvalues() {         list<item> result = new arraylist<item>();         //..call-back web-service, db, etc. , populate result variable.         return result;     } }

the item class this:

public class item {    private string label;    private string value;     //getters, setters. }

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