Tapestry数据校验Validator

最新推荐文章于 2020-09-28 13:18:38 发布

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最新推荐文章于 2020-09-28 13:18:38 发布

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分类专栏： java开源项目 J2EE 文章标签： tapestry string function buffer object validation

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本文介绍如何在Tapestry框架中实现自定义的数据校验功能，重点讲解BaseValidator和MinLength验证器的修改，包括客户端和服务端的校验逻辑。

Tapestry数据校验－修改各Validator

1,BaseValidator的修改非常简单，增加了一个submitName属性及其getter和setter。用于保存校验器适用的提交按钮的ID。

// whether skip this validator
   public boolean isSkipValid(IFormComponent field) {
       IPage page = field.getPage();
       return (page instanceof XtradeBasePage && this.getSubmitName() != null && !this
               .getSubmitName()
               .equals(((XtradeBasePage) page).getSubmitName()));
   }

   // whether form range's validator
   public boolean isFormValid() {
       return this.getSubmitName() == null;
   }

//add validation script
   public void addScriptContent(IRequestCycle cycle, IComponent field,
           String submitListener) {
       TapestryUtils.getPageRenderSupport(cycle, field)
               .addInitializationScript(submitListener);
   }

2,MinLength的属性修改：

public void setMinLength(String minLength) { if (minLength.lastIndexOf("_") == -1) { _minLength = Integer.parseInt(minLength); } else { _minLength = Integer.parseInt(minLength.substring(minLength .lastIndexOf("_") + 1)); this.setSubmitName(minLength.substring(0, minLength .lastIndexOf("_"))); } } public String getMinLength() { if (this.getSubmitName() == null) return _minLength + ""; else return this.getSubmitName() + "_" + _minLength; }

用于解析提交按钮ID和最小值。格式：SubmitID_MinLength，如：search_5

3,同时，需要修改validate方法，用于服务器端校验：

public void validate(IFormComponent field, ValidationMessages messages,
           Object object) throws ValidatorException {
       String string = (String) object;
       if (!this.isSkipValid(field)) {
           if (string == null || string.length() < _minLength)
               throw new ValidatorException(buildMessage(messages, field),
                       ValidationConstraint.MINIMUM_WIDTH);
       }
   }

其中绿色部分是为了兼容Tapestry缺省的做法：如果不加提交按钮ID前缀，则对所以提交按钮进行校验。

4,当然了，客户端校验的代码也需要修改：

public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
           FormComponentContributorContext context, IFormComponent field) {

       context
               .includeClasspathScript("/org/apache/tapestry/form/validator/StringValidator.js");
       context
               .includeClasspathScript("/com/fitechlabs/xtrade/web/tapestry/validator/MinLengthValidator.js");
       String message = buildMessage(context, field);
       if (this.isFormValid()) {
           context.addSubmitHandler(Script.getFormMinLengthScript(field,
                   _minLength, TapestryUtils.enquote(message)));
       } else {
           this.addScriptContent(cycle, field, Script
                   .getSubmitMinLengthScript(this.getSubmitName(), field,
                           _minLength, TapestryUtils.enquote(message)));
       }
   }

其中绿色部分是原来的默认操作。

5,MinLengthValidator.js代码比较简单

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

6,Script.java代码

public static String getFormMinLengthScript(IFormComponent field,
           int minLength, String message) {
       StringBuffer buffer = new StringBuffer();

       buffer
               .append("function(event) { Tapestry.validate_min_length(event, '");
       buffer.append(field.getClientId());
       buffer.append("', ");
       buffer.append(minLength);
       buffer.append(", ");
       buffer.append(message);
       buffer.append("); }");
       return buffer.toString();
   }

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

其它的Validator根据MinLength进行相应的修改即可。