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Building a Simple JavaServer Faces Application
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<h:selectOneRadio id="gender" value="#{UserBeangender}" required="true"/> <f:selectItem itemLabel="Male" itemValue="male"/> <f:selectItem itemLabel="Female" itemValue="female"/> </h:selectOneRadio> <h:message for="gender"/>
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PART I PART I PART I
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The main parent tag, <h:selectOneRadio>, is the one that is value bound to the UserBean s gender property via the JavaBeans getter and setter This means that whatever value is selected in the radio button control, it will be updated in the gender property of the managed bean when the form is submitted For the individual select choices, the child tags <f:selectItem > provide both a displayed value or itemLabel along with an actual itemValue, which is the actual value used when a selection occurs As before, a selection is required and if left blank, an error message will appear via the <h:message > tag Moving on to the next input field, you see the following code:
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<h:inputText value="#{UserBeandob}" id="dob" required="true" > <f:convertDateTime pattern="MM-dd-yy"/> </h:inputText> (mm-dd-yy) <h:message for="dob"/>
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As before, this input field is required, but this time instead of being bound to a bean property that is a String, this inputText component is bound to the UserBeandob property that is of type javautilDate In order to translate the incoming string value into the serverside Date type, a JSF converter is used with the tag <f:convertDateTime> Notice the pattern attribute of the Converter tag also defines the expected date format pattern of MM-dd-yy
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NOTE To JSF, the uppercase MM actually means month and mm means minutes However,
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most end users wouldn t necessarily know this so the date pattern prompt is left intentionally in lowercase (mm-dd-yy) When the user enters a date string following the specified format, the Converter will convert it to a Date object and assign it to the UserBeandob property However, if an incorrect date format pattern is used, a conversion error will be displayed To see what occurs when improper information is entered and submitted in the registration form, Figure 2-5 contains a screenshot of the registration page with various validation and converter error messages shown Notice the Email Address error message is shown when foo is entered This is because the associated validation method validateEmail( ) in the UserBean managed bean is not accepting the foo string as a valid e-mail address:
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<h:inputText id="email" value="#{UserBeanemail}" required="true" validator="#{UserBeanvalidateEmail}"/> <h:message for="email"/>
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This is actually the simplest form of custom validation in JavaServer Faces Another method for creating custom validation can be achieved by creating a separate Validator class and then registering it in the faces-configxml Also, an even more robust custom validation procedure involves creating a custom component with the validation built into it
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Part I:
The JavaServer Faces Framework
FIGURE 2-5 JSFReg with validation errors
Later chapters will examine many more validation examples To understand how the simple e-mail validation works, let s examine the validateEmail( ) code again:
public void validateEmail(FacesContext context, UIComponent toValidate, Object value) throws ValidatorException { String eMail = (String) value; if(eMailindexOf( @")<0) { FacesMessage message = new FacesMessage( Invalid email address"); throw new ValidatorException(message); } }
The key thing to notice in the custom validation method is that the value of the field is checked to see if it contains an @ symbol and if it s not found, an appropriate Invalid e-mail FacesMessage is created A ValidatorException is then thrown, which halts further processing and causes the error message to appear next to the e-mail input field Moving on to the next input field in the registerjsp page, you see another input select menu This time it is created with the <h:selectOneMenu> tag
<h:selectOneMenu value="#{UserBeanserviceLevel}"> <f:selectItem itemLabel="Basic" itemValue="basic"/> <f:selectItem itemLabel="Medium" itemValue="medium"/> <f:selectItem itemLabel="Premium" itemValue="premium"/> </h:selectOneMenu>
This tag s usage is basically identical to the previous radio-button tag except that it renders a drop-down menu as opposed to a radio button It has the same type of child <f:selectItem> tags as drop-down menu choices, but renders the different select choices
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