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該項目使用Primefaces 3.5，JSF 2.0，Oracle數據庫。Backing bean方法從輸入中獲取null
的觀點：
<h:form id="schedule" class="schedule">
// more JSF and forms and dialogs
<p:dialog widgetVar="patientDialog" dynamic="true" header="Find Patient" showEffect="clip" hideEffect="explode" modal="true" >
<h:form id="frmPatient">
<h:panelGrid id="findPatient" columns="1">
<h:panelGrid id="findPatientParameters" columns="2">
<h:outputLabel value="Firstname: " />
<p:inputText id="name" label="name" size="15" value="#{waitinglistBean.name}" />
<h:outputLabel value="Patient Code: " />
<p:inputText id="pcode" label="pcode" size="15" value="#{waitinglistBean.pcode}" />
<br />
<p:commandButton value="Search" process="name" actionListener="#{waitinglistBean.patients}" update="patients"/>
</h:panelGrid>
<h:panelGrid id="findPatientDetails" columns="1">
<p:dataTable id="patients" var="patient" resizableColumns="true" scrollable="true" scrollWidth="1250"
scrollHeight="150" value="#{waitinglistBean.patients}"
rowKey="#{patient.PCode}" selection="#{waitinglistBean.selectedPatient}"
selectionMode="single" >
<f:facet name="header">
Click "Select" button after selecting a row to select patient.
</f:facet>
<p:column width="150" headerText="Code">
#{patient.PCode}
</p:column>
<p:column width="150" headerText="Family Name">
#{patient.PLname}
</p:column>
<p:column width="150" headerText="First Name">
#{patient.PFname}
</p:column>
<p:column headerText="Sex" >
#{patient.PSex}
</p:column>
<p:column headerText="Birthdate">
#{patient.PBorn}
</p:column>
<p:column headerText="Street">
#{patient.PStreet}
</p:column>
<f:facet name="footer">
<p:commandButton id="viewButton" value="Select" icon="ui-icon-search"
oncomplete="patientDialog.hide()"
update=":frmDialogs:frmWaiting:tabView:patientDetails"
process="patients"/>
</f:facet>
</p:dataTable>
</h:panelGrid>
</h:panelGrid>
</h:form>
</p:dialog>
<p:dialog widgetVar="patientDialog" dynamic="true" header="Find Patient" showEffect="clip" hideEffect="explode" modal="true" >
<h:form id="frmPatient">
<h:panelGrid id="findPatient" columns="1">
<h:panelGrid id="findPatientParameters" columns="2">
<h:outputLabel value="Firstname: " />
<p:inputText id="name" label="name" size="15" value="#{waitinglistBean.name}" />
<h:outputLabel value="Patient Code: " />
<p:inputText id="pcode" label="pcode" size="15" value="#{waitinglistBean.pcode}" />
<br />
<p:commandButton value="Search" process="name" actionListener="#{waitinglistBean.patients}" update="patients"/>
</h:panelGrid>
<h:panelGrid id="findPatientDetails" columns="1">
<p:dataTable id="patients" var="patient" resizableColumns="true" scrollable="true" scrollWidth="1250"
scrollHeight="150" value="#{waitinglistBean.patients}"
rowKey="#{patient.PCode}" selection="#{waitinglistBean.selectedPatient}"
selectionMode="single" >
<f:facet name="header">
Click "Select" button after selecting a row to select patient.
</f:facet>
<p:column width="150" headerText="Code">
#{patient.PCode}
</p:column>
<p:column width="150" headerText="Family Name">
#{patient.PLname}
</p:column>
<p:column width="150" headerText="First Name">
#{patient.PFname}
</p:column>
<p:column headerText="Sex" >
#{patient.PSex}
</p:column>
<p:column headerText="Birthdate">
#{patient.PBorn}
</p:column>
<p:column headerText="Street">
#{patient.PStreet}
</p:column>
<f:facet name="footer">
<p:commandButton id="viewButton" value="Select" icon="ui-icon-search"
oncomplete="patientDialog.hide()"
update=":frmDialogs:frmWaiting:tabView:patientDetails"
process="patients"/>
</f:facet>
</p:dataTable>
</h:panelGrid>
</h:panelGrid>
</h:form>
</p:dialog>
// more JSF and dialogshizzle
</h:form>
的支持bean：
@ManagedBean(name="waitinglistBean")
@ViewScoped
public class WaitinglistBean implements Serializable
{
private Patients patient;
private OrWaitinglist orWaitinglist;
private List<Patients> patients = new ArrayList<Patients>();
private String name;
private Integer pcode;
public WaitinglistBean() {
}
public void setSelectedPatient(Patients patient) {
this.patient = patient;
}
public Patients getSelectedPatient() {
return patient;
}
public OrWaitinglist getOrWaitinglist() {
return orWaitinglist;
}
public void setOrWaitinglist(OrWaitinglist orWaitinglist) {
this.orWaitinglist = orWaitinglist;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getPcode() {
return pcode;
}
public void setPcode(Integer pcode) {
this.pcode = pcode;
}
public List<Patients> getPatients() {
PatientsDao patientsDao = new PatientsDaoImpl();
patients = patientsDao.getSearchPatient(name, pcode);
System.out.println(name + " " + pcode);
return patients;
}
public void createOrWaitinglist()
{
orWaitinglist.setPatients(patient);
}
所以第一用戶輸入一個字符串： 「名字」 和一個整數： 「病人代碼」。 當他打了「搜索」按鈕，它激發了的ActionListener =「＃{} patientBean.patients該 內部命令按鈕，該方法需要有自己制定者/吸氣2個參數name和P碼。
當我看在控制檯中，它向我顯示了這兩個參數的打印輸出，並且它們是兩次「null」，所以這意味着來自JSF頁面的參數不會被傳遞到支持bean，儘管inputText的值已經被設置爲backingbean集合方法：價值=「＃{} patientBean.name」
我的問題，採用這些制定者，但我仍然得到空值現在爲什麼會出現這些空值我讀過幾個職位
。編輯後，我仍然有同樣的問題;
只需添加這兩種P的ID：inputText的收錄進搜索按鈕的過程屬性 – Jitesh 2013-04-10 11:42:26
我添加過程=「名稱「我的命令按鈕，但仍然」空「 – JeroenVP 2013-04-10 12:08:15
JSF代碼，包裝在HTML：窗體，？ –
2013-04-10 12:13:19