how to call collection in dropdown using selectitems in java server faces?
I have written a bean called comboboxbean & in faces-config mentioned its reference. Now when i try to call it inside <select items>
like #{comboboxbean.combovalues}
I am getting class not found and can not get value for combovalues etc.
Now either i am missing something or there is some configuration mismatch.
here are the things i did in detail:
public class ComboBoxTestBean
{
ProcessHelper procHelp = new ProcessHelper();
Project projObj=null;
String projectName="";
String projectId="";
List comboValues = new ArrayList();
private Object value = "Select from the dropdown list";
public ComboBoxTestBean(){
for(Iterator iter = procHelp.getAllProjects().iterator(); iter.hasNext(); )
{
projObj = (Project)iter.next();
projectId=projObj.getProjectID();
projectName=projObj.getProjectName();
comboValues.add(new SelectItem(projectName+"_"+projectId));
}
}
private void changeItems(String value){
//We can put a check for the prev matching-word and present word to avoid the below processing. (previous matching-word is not saved right now)
if(value == null)
return;
comboValues.clear();
for(Iterator iter = procHelp.getAllProjects().iterator(); iter.hasNext(); )
{
projObj = (Project)iter.next();
projectName=projObj.getProjectName();
projectId=projObj.getProjectID();
if(projectName.startsWith(value)){
comboValues.add(new SelectItem(projectName+"_"+projectId));
}
}
}
public void setComboValues(List comboValues){
this.comboValues = comboValues;
}
public List getComboValues(){
FacesContext context = FacesContext.getCurrentInstance();
ComboBox combo = (ComboBox)context.getViewRoot().findComponent("doSearch:dropDownComboId2");
String value = combo.getMatchingWord();//retrieves the matching word (given in the input-text)
System.out.println("value = "+value);
changeItems(value);
System.out.println("this.comboValues = "+this.comboValues);
return this.comboValues;
}
public void setValue( Object value )
{
this.value = value;
}
public Object getValue()
{
return value;
}
}
and in faces-config.xml its like:
<managed-bean>
<description> Bean to test the drop-down comboBox functionality</description>
<managed-bean-name>ComboBoxTestBean</managed-bean-name>
<managed-bean-class>ComboBoxTestBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
Now trying to use in jsp as:
<ca_h:label id="dropL1" value="SelectProject:" for="dropDownComboId2" rendered="true"/>
<ca_h:comboBox id="dropDownComboId2" value="#{ComboBoxTestBean.value}" accessKey="e" isAJAXEnabled="true" size="10" type="dropDownCombo">
<f:selectItems value="#{ComboBoxTestBean.comboValues}" />
</ca_h:comboBox>
Now there are some other things.
this whole thing if i keep inside jsp i.e. bean then some extar things used are these:
<%
Object obj = session.getAttribute("dropDownComboBoxTestBean_ajax");
if(obj == null || obj instanceof ComboBoxTestBean){
obj = new ComboBoxTestBean();
session.setAttribute("dropDownComboBoxTestBean_ajax", obj);
}
%>
and
<%
FacesContext context = FacesContext.getCurrentInstance();
StateManager stateManager = context.getApplication().getStateManager();
SerializedView view = stateManager.saveSerializedView( context );
//System.out.println("ssss "+stateManager.isSavingStateInClient(context));
if(stateManager.isSavingStateInClient(context))
{
stateManager.writeState(context, view);
//System.out.println("ddddd");
}
else{
Object myfacesSeqParam = context.getExternalContext().getRequestMap().get("jsf_sequence");
if(myfacesSeqParam == null)
myfacesSeqParam = context.getExternalContext().getSessionMap().get("jsf_sequence");
out.println("<input type='hidden' name='jsf_sequence' id='jsf_sequence' value='"+myfacesSeqParam+"'>");
}
%>
but i don't know why they are getting used.
and in case i need to use many beans to display many combo the do i still need to keep them in jsp or should i place it in any bean.
Please guide me i am not in right track.
thanks
vijendra
