Tapestry数据校验－修改Required Validator

最新推荐文章于 2024-02-09 15:54:02 发布

转载最新推荐文章于 2024-02-09 15:54:02 发布 · 1.1k 阅读

文章标签：

#tapestry #string #object #function #buffer #getter

J2EE 同时被 2 个专栏收录

149 篇文章

订阅专栏

java开源项目

110 篇文章

订阅专栏

本文介绍了一种解决Tapestry框架中RequiredValidator问题的方法，通过创建新的Required2验证器来避免字符串转布尔类型错误，并详细展示了代码实现。

Tapestry数据校验－修改Required Validator

Required的修改遇到麻烦事，因为BaseValidator有一个方法isRequired，这样增加一个属性required的getter和 setter，page文件中设置required=searchId时，总是去匹配isRequired方法，这样出现字符串转换为布尔型错误。
为了对其它校验器不产生影响，我增加了一个校验器Required2,配置时required2=searchId。
同时，required类型的校验器本来不需要参数，所以现在参数值就是提交按钮的ID，因而可以使用BaseValidator的submitName属性。代码如下：

public class Required2 extends BaseValidator {

   public String getRequired2() {
       return this.getSubmitName();
   }

   public void setRequired2(String required) {
       this.setSubmitName(required);
   }

   public Required2() {
   }

   public Required2(String initializer) {
       super(initializer);
   }

   public boolean getAcceptsNull() {
       return true;
   }

   public void validate(IFormComponent field, ValidationMessages messages,
           Object object) throws ValidatorException {
       if (!this.isSkipValid(field)) {
           if ((object == null)
                   || (String.class.isInstance(object) && (((String) object)
                           .length() == 0))
                   || (Collection.class.isInstance(object) && ((Collection) object)
                           .isEmpty())) {
               String message = buildMessage(messages, field);
               throw new ValidatorException(message,
                       ValidationConstraint.REQUIRED);
           }
       }
   }

   private String buildMessage(ValidationMessages messages,
           IFormComponent field) {
       return messages.formatValidationMessage(getMessage(),
               ValidationStrings.REQUIRED_FIELD, new Object[] { field
                       .getDisplayName() });
   }

   public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
           FormComponentContributorContext context, IFormComponent field) {
       context
               .includeClasspathScript("/com/fitechlabs/xtrade/web/tapestry/validator/RequiredValidator.js");
       if (this.isFormValid()) {
           context.addSubmitHandler(Script.getFormRequiredScript(field,
                   TapestryUtils.enquote(buildMessage(context, field))));
       } else {
           this.addScriptContent(cycle, field, Script.getSubmitRequiredScript(
                   this.getSubmitName(), field, TapestryUtils
                           .enquote(buildMessage(context, field))));
       }
   }
}

Required2.js:

TapestryEx.requiredValid=function(event,formId,fieldId,message){
   var field = document.getElementById(formId).elements[fieldId];
   if (field.value.length < 1)
       event.invalid_field(field, message)
}

Script.java:

public static String getFormRequiredScript(IFormComponent field,
           String message) {
       StringBuffer buffer = new StringBuffer(
               "function(event) { Tapestry.require_field(event, '");
       buffer.append(field.getClientId());
       buffer.append("', ");
       buffer.append(message);
       buffer.append("); }");
       return buffer.toString();
   }

   public static String getSubmitRequiredScript(String submitName,
           IFormComponent field, String message) {
       StringBuffer buffer = new StringBuffer();
       buffer.append("TapestryEx.onclick(");
       buffer.append("'" + submitName + "',");
       buffer.append("function(event){TapestryEx.requiredValid(event,");
       buffer.append("'" + field.getForm().getId() + "',");
       buffer.append("'" + field.getClientId() + "',");
       buffer.append(message + ");});");
       return buffer.toString();
   }

需要修改tapestry-4.0.jar/META-INF/ tapestry.form.validator.xml的“ <contribution configuration-id="Validators">”部分，其中增加
<validator name="required2" class="com.yourcompany.validator.Required2"/>