Question

我有一个表单，其中包含一些在处理表单数据时验证的字段。这是一种合理性/一致性检查。检查本身很昂贵，因此不应该执行两次。但是在成功提交表单期间必须才能执行，因此它是支持bean中commandButton操作方法的一部分。

我认为如果我使用＆lt; f：validator＆gt;，它将在验证阶段执行一次，然后在提交时再次执行。正如我所说，这是不可取的。

据我了解文档，只需在表单的某个组件中添加一条消息就足以保留在表单上。

所以我试过

FacesContext.getCurrentInstance().addMessage("comandButtonID", "some message");

但它不会停留在表格上。

我是否需要执行其他操作才能将表单标记为无效？

如果重要，则支持bean是请求范围的。

所以，这是最小的完整例子操作系统：Linux
浏览器：Chromium
服务器：Tomcat 8.0.36
JDK：Oracle-JDK 1.8.0_92
JSF实现：myfaces 2.1.18 + tomahawk 20-1.1.14

在创建此示例时，我发现了一件事：当我将javax.faces.PROJECT_STAGE设置为＆＃34;开发＆＃34;和facelets.DEVELOPMENT到＆＃34; true＆＃34;，并显示消息。使用下面的web.xml设置，它不是。

web.xml（省略说明）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
           version="3.0">

  <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</param-value>
  </context-param>
  <context-param>
    <param-name>facelets.REFRESH_PERIOD</param-name>
    <param-value>2</param-value>
  </context-param>

  <context-param>
    <param-name>facelets.SKIP_COMMENTS</param-name>
    <param-value>true</param-value>
  </context-param>

  <context-param>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Production</param-value>
  </context-param>
  <context-param>
    <param-name>facelets.DEVELOPMENT</param-name>
    <param-value>false</param-value>
  </context-param>

  <context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>server</param-value>
  </context-param>
  <context-param>
    <param-name>
      org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION
    </param-name>
    <param-value>20</param-value>
  </context-param>

  <!-- START MyFaces filter -->

  <filter>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <filter-class>
      org.apache.myfaces.webapp.filter.ExtensionsFilter
    </filter-class>
    <init-param>
      <param-name>uploadMaxFileSize</param-name>
      <param-value>100m</param-value>
    </init-param>
    <init-param>
      <param-name>uploadThresholdSize</param-name>
      <param-value>100k</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
  </filter-mapping>
  <filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>*.xhtml</url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>/faces/*</url-pattern>
  </filter-mapping>

  <!-- END MyFaces filter -->

  <!-- START MyFaces config -->

    <context-param>
      <param-name>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</param-name>
      <param-value>false</param-value>
    </context-param>

  <context-param>
    <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <param-name>
      org.apache.myfaces.READONLY_AS_DISABLED_FOR_SELECTS
    </param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <param-name>
      org.apache.myfaces.CHECK_EXTENSIONS_FILTER
    </param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>org.apache.myfaces.ADD_RESOURCE_CLASS</param-name>
    <param-value>
      org.apache.myfaces.renderkit.html.util.DefaultAddResource
    </param-value>
  </context-param>
  <context-param>
    <param-name>
      org.apache.myfaces.RESOURCE_VIRTUAL_PATH
    </param-name>
    <param-value>/faces/myFacesExtensionResource</param-value>
  </context-param>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.xhtml</url-pattern>
  </servlet-mapping>

  <!-- END MyFaces config -->

  <welcome-file-list>
    <welcome-file>testform.xhtml</welcome-file>
  </welcome-file-list>

</web-app>

faces-config.xml中

<?xml version='1.0' encoding='UTF-8'?>

<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
              version="2.0">

  <managed-bean>
    <managed-bean-name>FormTest</managed-bean-name>
    <managed-bean-class>FormTest</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
  </managed-bean>

  <navigation-rule>
    <navigation-case>
      <from-action>#{FormTest.formAction}</from-action>
      <from-outcome>OK</from-outcome>
      <to-view-id>/testform_OK.xhtml</to-view-id>
    </navigation-case>
    <!-- I've also tried to remove the second navigation-case -->
    <navigation-case>
      <from-action>#{FormTest.formAction}</from-action>
      <from-outcome>FAIL</from-outcome>
      <to-view-id>/testform.xhtml</to-view-id>
    </navigation-case>
  </navigation-rule>

</faces-config>

FormTest.java

public class FormTest {
  String input;

  public String getInput() {
    return input;
  }

  public void setInput(String input) {
    this.input = input;
  }

  public String formAction() {
    final boolean valid = "ok".equalsIgnoreCase(input);
    if (!valid) {
      final FacesMessage message = new FacesMessage("not OK");
      message.setSeverity(FacesMessage.SEVERITY_ERROR);
      FacesContext.getCurrentInstance().addMessage("submit", message);
    }
    return valid ? "OK" : "FAIL";
  }
}

testform.xhtml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:t="http://myfaces.apache.org/tomahawk">

<h:head>
  <title>Test Form</title>
</h:head>

<h:body>
  <h:form id="form">
    <h:outputText value="Enter &quot;ok&quot; (case insensitive) to get to the next page."/>
    <br/>
    <h:outputText value="Any other value should give an error message and stay on this page."/>
    <br/>
    <h:inputText id="input" value="#{FormTest.input}"/>
    <br/>
    <h:message id="submitMessage" for="submit"/>
    <t:commandButton id="submit" value="Submit" action="#{FormTest.formAction}"/>
  </h:form>
</h:body>

</html>

testform_OK.xhtml

<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html">

<h:head>
  <title>Form was submitted</title>
</h:head>

<h:body>
  Form was submitted with value &quot;OK&quot;.
</h:body>

</html>

单击commandButton后添加消息并停留在表单上

0 个答案: