I have the follwing register form:
<h:form id="newCustomerForm" >
<fieldset>
<legend>Register Form</legend>
<table border="0" >
<tbody >
<tr type="text">
<td>
<p:outputLabel value="Account Login :" for="pseudo"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="pseudo" value="#{customerMB.login}" title="Pseudo" required="true" requiredMessage="The Pseudo field is required."/>
<p:watermark for="pseudo" value="Login" />
<p:message for="pseudo"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="password">
<td>
<p:outputLabel value="Password :" for="pwd1"/>
</td>
<p:spacer height="5px" />
<td>
<p:password id="pwd1" value="#{customerMB.password}" feedback="true" match="pwd2" label="Password 1" required="true" requiredMessage="The Password field is required."/>
<p:watermark for="pwd1" value="Password" />
<p:message for="pwd1"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="password">
<td>
<p:outputLabel value="Confirm password :" for="pwd2"/>
</td>
<p:spacer height="5px" />
<td>
<p:password id="pwd2" value="#{customerMB.password}" feedback="true" label="Password 2" required="true" requiredMessage="The confirm password field is required."/>
<p:watermark for="pwd2" value="Confirm Password" />
<p:message for="pwd2"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Email address :" for="email"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="email" value="#{customerMB.email}" title="Email" required="true" validatorMessage="Insert a valid email" requiredMessage="The Email field is required.">
<f:validateRegex pattern="([^.@]+)(\.[^.@]+)*@([^.@]+\.)+([^.@]+)" />
</p:inputText>
<p:watermark for="email" value="Email" />
<p:message for="email"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="First Name :" for="name"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="name" value="#{customerMB.name}" title="Name" required="true" requiredMessage="The Name field is required." styleClass="error"/>
<p:watermark for="name" value="First Name" />
<p:message for="name"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Last Name :" for="familyName"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="familyName" value="#{customerMB.familyName}" title="FamilyName" required="true" requiredMessage="The FamilyName field is required."/>
<p:watermark for="familyName" value="Last Name" />
<p:message for="familyName"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Organization :" for="organisation"/>
</td>
<p:spacer height="5px" />
<td>
<p:inputText id="organisation" value="#{customerMB.organisation}" title="Organisation" required="true" requiredMessage="The Organisation field is required."/>
<p:watermark for="organisation" value="Organisation" />
<p:message for="organisation"/>
</td>
</tr>
<p:spacer height="5px" />
<tr type="text">
<td>
<p:outputLabel value="Country :" for="country"/>
</td>
<p:spacer height="5px" />
<td>
<p:selectOneMenu id="country" style="width: 292px" value="#{customerMB.address.country}" required="true" requiredMessage="The Status field is required." >
<f:selectItem itemLabel="Select Country" itemValue="" />
<f:selectItems value="#{customerMB.allCountries}" />
</p:selectOneMenu>
<p:watermark for="country" value="Country" />
<p:message for="country"/>
</td>
</tr>
<p:spacer height="5px" />
<p:spacer height="5px" />
</tbody>
</table>
<div type="submit" align="right" style="margin-top: 5px">
<p:commandButton style="margin-right: 20px" value="Save" ajax="false" icon="ui-icon-circle-check" styleClass="ui-priority-primary" action="#{customerMB.addCustomer()}" />
<p:commandButton value="Cancel" icon="ui-icon-arrowrefresh-1-n" onclick="location.href = 'login.jsp';" process="@this" >
<p:resetInput target="customerPannel" />
</p:commandButton>
</div>
</fieldset>
</h:form>
The method that persists a user account in my ViewScoped Bean is:
public String addCustomer() throws IOException {
logger.log(Level.SEVERE, "*****add customer***** ");
creation = new Date();
right = Right.SimpleUser;
Customer customerRegister = customerLocal.addUser(name, familyName, address, email, right, creation, organisation);
accountBusinessLocal.addAccount(login, password, customerRegister);
return "login.jsp";
}
And this is my account ManagedBean
public class AccountBusiness implements AccountBusinessLocal {
@Inject
private AccountManagerLocal accountManagerLocal;
@Override
public Account addAccount(String login, String password, Customer customer) {
Account account;
account = accountManagerLocal.createAccount(login, password);
account.setCustomer(customer);
accountManagerLocal.persistAccount(account);
return account;
}
@Override
public boolean authentificateUser(String username, String password) {
Account account = accountManagerLocal.findByLogin(username);
if (account != null) {
if (password.equalsIgnoreCase(account.getPassword())) {
return true;
}
}
return false;
}
}
I want to add a control in the account login input text that checks if the username is already used by another user or not. If yes the user should get a message and re-enter an available username. How can i do this??
One way to do it is by submitting your input on blur and checking if it's duplicated. In case it's duplicated you will need to register a message specific for that component, in this case, I will bind the input to be able to access the component's id from my bean.
Here is a sample (and tested) code that contains the relevant elements you will need:
View
<h:form id="mainForm">
<h:panelGrid id="grid" columns="3" cellpadding="4">
<p:outputLabel for="pseudo" value="Login" />
<p:inputText id="pseudo" value="#{viewMBean.login}" binding="#{viewMBean.loginInput}" title="Pseudo" required="true" requiredMessage="The Pseudo field is required."
placeholder="Login">
<p:ajax event="blur" listener="#{viewMBean.checkDuplicateLogin}" update="pseudoMsg" />
</p:inputText>
<p:message id="pseudoMsg" for="pseudo" />
</h:panelGrid>
<p:commandButton value="Register" />
</h:form>
Bean
import java.io.Serializable;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
@ManagedBean
@ViewScoped
public class ViewMBean implements Serializable {
private UIComponent loginInput;
private String login;
public void checkDuplicateLogin() {
//replace with your own fancy code
if (login.equals("admin")) {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(loginInput.getClientId(), new FacesMessage(FacesMessage.SEVERITY_ERROR, "Duplicated Login", null));
}
}
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public UIComponent getLoginInput() {
return loginInput;
}
public void setLoginInput(UIComponent loginInput) {
this.loginInput = loginInput;
}
}
Make changes to addCustomer() method as below . I've added comments for you to get an idea.
public String addCustomer() throws IOException {
//you don't need password to check though
boolean isExist = accountBusinessLocal.authentificateUser(login,password);
if(isExist){
//return empty
FacesContext context = FacesContext.getCurrentInstance(
context.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Duplicated Login", null));
return "";
}
logger.log(Level.SEVERE, "*****add customer***** ");
creation = new Date();
right = Right.SimpleUser;
Customer customerRegister = customerLocal.addUser(name, familyName, address, email, right, creation, organisation);
accountBusinessLocal.addAccount(login, password, customerRegister);
return "login.jsp";
}
Update: In order to show message ,add p:message tag inside the form.
<p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />
来源：https://stackoverflow.com/questions/22013665/check-if-username-already-exists-in-the-register-form