How can I retrieve values from my drop-down list?: JSF, Java

by: MuraliKanthPosted on 2009-09-27 at 16:48:55ID: 25435986

when ur page is rendered do a right click and click view source and see the generated html.
Make sure the drop down has name="selectMenu1" also all the value attributes are set.

if possible post the jsf code here.

-Murali*

by: grnmachinePosted on 2009-09-27 at 16:53:33ID: 25436001

I checked the source and the drop down name is selectMenu1 and the attributes are set. Below is my jsf code.

<%@taglib uri="http://jakarta.apache.org/struts/tags-tiles"
	prefix="tiles"%>
<%@taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@taglib uri="http://www.ibm.com/jsf/html_extended" prefix="hx"%>
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<html>
<head>
<link rel="stylesheet"
	href="${pageContext.request.contextPath}/theme/Master.css"
	type="text/css">
<link rel="stylesheet" type="text/css"
	href="${pageContext.request.contextPath}/theme/stylesheet.css"
	title="Style">
</head>
<body>
  <h:messages errorStyle="color: red"/>
<hx:viewFragment id="viewFragment1">
	<hx:scriptCollector id="scriptCollector1">
 
		<center><h:form>
			<div
				style="width: 548px; border-color: black; border-width: 1px; border-style: solid" align="left">
			<table cellpadding="10" bgcolor="white">
				<tr>
					<td align="left" width="548"><font size="-2" color="red"><span
						style="font-weight: 100">*Required</span></font><br>
					<b><br>
					Search Criteria</b></td>
				</tr>
				<tr>
					<td align="left" width="548">
					<table width="400px"  style="float: left">
						<tr>
							<td width="50" />
							<td align="left" width="122"><b>Year: <font color="red">*</font></b></td>
							<td width="225"><h:selectOneMenu styleClass="selectOneMenu" id="selectMenu1">
								<f:selectItems value="#{physicianCountBackingBean.listFiscalDates}"/>
								</h:selectOneMenu></td>
						</tr>
						<tr>
							<td width="50" />
							<td align="left" width="122"><b>Quarter: <font color="red">*</font></b></td>
							<td width="225"><h:selectOneMenu
								id="menu2" styleClass="selectOneMenu" value="#{physicianCountBackingBean.fiscalQuarterString}" >
								<f:selectItem itemValue="Apr-Jun" itemLabel="Apr-Jun"/>
								</h:selectOneMenu></td>
						</tr>
					</table>
					</td>
				</tr>
				<tr>
					<td height="20" width="548"></td>
				</tr>
			</table>
			</div><p>
			<h:commandButton action="back"
				immediate="true" value="Back" styleClass="button"/>
			<h:commandButton
				action="#{physicianCountBackingBean.findPhysicianCounts}"
				value="Search" styleClass="button" immediate="true"/> 
				<h:commandButton value="Clear" type ="reset" styleClass="button"/></p>
		</h:form></center>
	</hx:scriptCollector>
</hx:viewFragment>
</body>
</html>

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by: MuraliKanthPosted on 2009-09-27 at 18:24:15ID: 25436270

try this,

String value = context.getExternalContext().getRequestParameterValuesMap().get("selectMenu1");

by: grnmachinePosted on 2009-09-27 at 18:24:44ID: 25436271

If anyone could help as soon as possible it would be much appreciated, points are now at 500.

by: grnmachinePosted on 2009-09-27 at 18:34:58ID: 25436305

Sorry MuraliKanth, I still get a nullPointerException, even with your code.

by: a_bPosted on 2009-09-27 at 21:11:22ID: 25436684

Is it possible for you to add a value="#{beanName.attribute}" to the tag and tie it up to a bean property? That way you will not have to a getParameter()?

Also, can you check the html source and see what is the id for the select box?

by: grnmachinePosted on 2009-09-27 at 21:15:11ID: 25436696

Sorry a_b, but what do you mean exactly?

by: a_bPosted on 2009-09-27 at 21:18:43ID: 25436708

<h:selectOneMenu styleClass="selectOneMenu" id="selectMenu1" value="#{physicianCountBackingBean.selectedDate}" > == here selectedDate is a backing bean property that you can read once you submit the page
<f:selectItems value="#{physicianCountBackingBean.listFiscalDates}"/>
</h:selectOneMenu></td>

by: grnmachinePosted on 2009-09-27 at 21:30:56ID: 25436747

Ok, how would I go about reading the selectedDate property in my backing bean? What does the type of selectedDate have to be? SelectItem?

by: a_bPosted on 2009-09-28 at 00:49:15ID: 25437364

Just a string would do. Once the submit button is clicked the vakues would automatically be present at the backing bean.

by: grnmachinePosted on 2009-09-28 at 07:06:25ID: 25439420

Hi a_b, when I submit the page, in my backing bean, I try to retrieve the property selectedDate, but get a null value returned. I am not sure why I keep getting a null value. I don't know if this matters, but my loadFiscalDates list is populated when the page loads in another method. When I submit my form, I call a different method than the one which populated my list. It is in this method that I am trying to get selectedDate but cannot. Could that be making a difference?

by: a_bPosted on 2009-09-28 at 21:19:04ID: 25445973

That should not matter. Once you submit the form the set should be called while doing an update on the model. Can you do a sysout and check what happens during the submit method?

by: grnmachinePosted on 2009-09-30 at 06:49:14ID: 31634199

The solution received a B because it solved part of my problem but I figured out that my collection<selectItems> wsa not working correctly so I changed it to List<SelectItems> and after that, the properties were being set and I could retrieve the value.

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How can I retrieve values from my drop-down list?

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