Depends on the level of functionality you need. The best thing to do
for user experience is to AJAX the combo boxes, so that when one
changes, you can reload the next one with the dependent values. For
this I would suggest researching a4j [1].
As for getting the selected item, the select one menu operates off of
value binding. Each select item has a value property. That value is
what is used to set the property of the select on value:
<t:selectOneMenu value="#{myBean.selectedItem}">
<f:selectItems value="#{myBean.selectItems}" />
</t:selectOneMenu>
In this example, when the form is submitted (not when the combo
changes by default), the "myBean.setSelectedItem(Object)" method will
be called. You can use this setter or use an action to load the next
combo box.
Here is how it may look without AJAX (note that the clickLink java
script code can be found in the WIKI at [2]):
<t:commandLink actionListener="#{myBean.countryChanged}"
style="visibility: hidden; display="none" id="onCountryChange"
forceId="true" />
<t:selectOneMenu
onChange="clickLink('onCountryChange')"
value="#{myBean.selectedCountry}">
<f:selectItems value="#{myBean.countries}" />
</t:selectOneMenu>
<t:commandLink actionListener="#{myBean.stateChanged}"
style="visibility: hidden; display="none" id="onStateChange" forceId="true" />
<t:selectOneMenu
onChange="clickLink('onStateChange')"
value="#{myBean.selectedState}">
<f:selectItems value="#{myBean.statesForCurrentCountry}" />
</t:selectOneMenu>
As for the Java, I'd like to leave you something to figure out :-)
-Andrew
[1] https://ajax4jsf.dev.java.net/nonav/ajax/ajax-jsf/
[2] http://wiki.apache.org/myfaces/JavascriptWithJavaServerFaces
On 8/22/06, tukutela <[EMAIL PROTECTED]> wrote:
I posted yesterday and got some great help, java forums are amazing, so many
people offering advice.
I've got a list of three selectonemenus I need to populate in descending
order, country, state, then finally city, each are dependent on the other.
I've created a country object (menu) which grabs data from the database and
it works perfectly, however I don't know how to get the selectedItem from
the list, and pass that value to the next state selectonemenu so it can in
turn populate the states for that given country selected. I'm having some
trouble scouring the web for examples, does anybody have anything that could
help?
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