How to read value from select list

Question

Hi,
i'm using jdev 10.1.3.1.0, adf, jsp and struts.
i've made a simple viewobject 'bestyrer' (danish for department) and it contains a list of all available department in my organization.
it appears in my jsp page as a dropdown list and when the user chose a specific department all employees in that department are shown as a master detail relationship.
It works and its standard drag'n'drop in JDev.
I need to know which department the user have chosen because the information i show to the user depends on it.
my view look like this:
SELECT KBestyrer.BESTYRER,
KBestyrer.NAVN
FROM K_BESTYRER KBestyrer
bestyrer is a number and navn is the name of the department.
the code generated in my jsp based on drag and drop is:
<html:select property="KBestyrerView"
disabled="${!bindings[\'KBestyrerView\'].updateable}"
onchange="DataForm.submit();">
<html:optionsCollection label="prompt" value="index"
property="KBestyrerView.displayData" />
</html:select>
and the corresponding HTML generated is:
<select name="KBestyrerView" onchange="DataForm.submit();"><option value="0" selected="selected">0 Vejdirektoratet</option>
<option value="1">101 København</option>
<option value="2">147 Frederiksberg</option>
<option value="3">151 Ballerup</option>
<option value="4">153 Brøndby</option>
<option value="5">155 Dragør</option>
<option value="6">157 Gentofte</option>
<option value="7">159 Gladsaxe</option>
<option value="8">161 Glostrup</option>
<option value="9">163 Herlev</option>
<option value="10">165 Albertslund</option>
<option value="104">999 Andet</option></select>
First of all i don't want the indexed values as values of my individual options but the real values as seen in fron of the name. i.e. 101 147 151 and so on.
how do i obtain this and how do i read the value the user have chosen?
hope to receive some help.
thanks
br
kim gabrielsen

Answer 1

Ok,
thanks for the pointer. it clearifies a bit but i cannot make it work.
I've created a second binding as described in the dokument which gives me another binding in the pagedef file:
<attributeValues IterBinding="KBestyrerViewIterator" id="Bestyrer">
<AttrNames>
<Item Value="Bestyrer"/>
</AttrNames>
</attributeValues>
i guess i should be able to reference this binding using 'Bestyrer' as the id.
in my JSP page i insert the following:
<html:select property="KBestyrerView"
disabled="${!bindings[\'KBestyrerView\'].updateable}"
onchange="inspect(this.form)" >
<html:optionsCollection label="prompt" value="#{bindings.Bestyrer.getInputValue()}"
property="KBestyrerView.displayData" />
</html:select>
but it fails with an error:
org.apache.commons.beanutils.NestedNullException: Null property value for '#{bindings'     at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:669)     at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)     at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:290)
I've tried #{bindings.Bestyrer} and #{bindings.Bestyrer.inputValue()}
but they fail too.
so there is clearly something i don't understand regarding this binding stuff.
Assuming i get this to work how do i actually accesss the value chosen by the user?
as far as i recall in plain HTML i gave the select list a name like:
name=MyList
and called a javascript function like this:
onchange="inspect(this.form)"
in my JS function i could access the value like this:
function inspect(form){
alert(form.MyList.options[form.MyList.selectedIndex].text)
but when i name the select list i receive an error:
javax.servlet.jsp.JspException: Cannot find bean under name MyList     at org.apache.struts.taglib.html.SelectTag.calculateMatchValues(SelectTag.java:301)     at org.apache.struts.taglib.html.SelectTag.doStartTag(SelectTag.java:244)     at brugeroversigt.jspService(_brugeroversigt.java:75)     [brugeroversigt.jsp]
I'm a bit confused here so any input would be appreciated.
br
kim gabrielsen