Geek Answers Handbook

Setting validator attribute using ui based EL: repeat var

I am looking for some guidance today with the problem I am facing.

What I'm trying to do is build a page on the fly with validation and all. The end result is to allow the user to customize the fields on the page using administrative functions. Below is a copy of the code that I use as a test page, where I go through the "Configure" fields and write out the fields using certain criteria.

<ui:repeat var="field" value="#{eventMgmt.eventFields}" varStatus="status">
  <div class="formLabel">
    <h:outputLabel value="#{field.customName}:"></h:outputLabel>
  </div>
  <div class="formInput">
    <h:inputText id="inputField" style="width:# {field.fieldSize gt 0 ? field.fieldSize : 140}px;">
      <f:validateRegex  disabled="#{empty field.validationPattern}" pattern="#{field.validationPattern}"></f:validateRegex>
    </h:inputText>
    <h:message for="inputField" showDetail="true" errorClass="errorText"></h:message>
  </div>
</ui:repeat>

After the page is displayed and I try to pass any values ​​for the field, I get the following message: "The Regex template must be set to a non-empty value." which, obviously, means that the expression is empty. I am wondering that fields that do not have an expression for them will be disabled when EL is evaluated. I can also take the same code # {field.validationPattern} and put it on the page, and the correct value will be written on the page.

So my questions are: 1. Is this possible? 2. At what point does the JSF container look at the template binding for the validate regular expression? 3. What am I doing wrong or What is the right way to do this?

I am running Tomcat 7.0.22, Mojarra 2.1.5 and Eclipse as my IDE.

+5
source share
1 answer

<f:validateRegex>, <ui:repeat>.

<f:xxx> , . , . EL . <h:xxx> <ui:xxx>, <ui:repeat>, . EL .

, , <f:validateRegex> , #{field} EL null.

.

  • , Field, :

    <h:inputText ... validator="#{field.validate}" />

    Field, :

    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    if (pattern != null) {
        RegexValidator regexValidator = new RegexValidator();
        regexValidator.setPattern(pattern);
        regexValidator.validate(context, component, value);
    }
}

  • #{eventMgmt.eventFields} ListDataModel<Field> #{eventMgmt} bean. , :

    <h:inputText ... validator="#{eventMgmt.validate}" />

    bean #{eventMgmt}:

    private DataModel<Field> model;
private RegexValidator regexValidator;

@PostConstruct
public void init() {
    regexValidator = new RegexValidator();
}

public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    String pattern = model.getRowData().getPattern();

    if (pattern != null) {
        regexValidator.setPattern(pattern);
        regexValidator.validate(context, component, value);
    }
}

  • Validator, RegexValidator <f:attribute>, Validator. <f:attribute> ValueExpression, . :.

    <h:inputText ...>
    <f:validator validatorId="extendedRegexValidator" />
    <f:attribute name="pattern" value="#{field.pattern}" />
</h:inputText>


    @FacesValidator("extendedRegexValidator")
public class ExtendedRegexValidator extends RegexValidator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        String pattern = (String) component.getAttributes().get("pattern");

        if (pattern != null) {
            setPattern(pattern);
            super.validate(context, component, value);
        }
    }

}

  • , JSF OmniFaces, <o:validator>. .

    <h:inputText ...>
    <o:validator validatorId="javax.faces.RegularExpression" pattern="#{field.pattern}" />
</h:inputText>

    , . <o:validator> , .

. :

+11

More articles:


All Articles