tapestry验证textarea

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本文介绍了一个自定义的Tapestry TextArea验证组件，该组件实现了对文本区域输入的长度限制及手机号码验证功能。文章提供了组件的具体实现代码，包括Java类及JWC配置文件，同时展示了如何通过自定义脚本进行前端验证。

tapestry验证textarea

ValidTextArea.java：

java代码:

package com.tomxp.web.components.valid; 

import org.apache.tapestry.ApplicationRuntimeException; 
import org.apache.tapestry.IForm; 
import org.apache.tapestry.IMarkupWriter; 
import org.apache.tapestry.IRequestCycle; 
import org.apache.tapestry.Tapestry; 
import org.apache.tapestry.form.TextArea; 
import org.apache.tapestry.valid.IValidationDelegate; 
import org.apache.tapestry.valid.IValidator; 
import org.apache.tapestry.valid.ValidatorException; 

/** 
* @author Peter Butler 
*/ 
public abstract class ValidTextArea extends TextArea { 
        WriterErrorDecorator myWriter = new WriterErrorDecorator(this); 
        
        public ValidTextArea() { 
                super(); 
        } 
        
        public abstract IValidator getValidator(); 

        public abstract String getDisplayName(); 
        
        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) { 
                IForm form = getForm(cycle); 
                IValidationDelegate delegate = form.getDelegate(); 

                if (delegate == null) 
                        throw new ApplicationRuntimeException(Tapestry.format("ValidTextArea.no-delegate", getExtendedId(), getForm().getExtendedId()), this, null, null); 

                IValidator validator = getValidator(); 

                if (validator == null) 
                        throw Tapestry.createRequiredParameterException(this, "validator"); 

                boolean rendering = !cycle.isRewinding(); 
                
                IMarkupWriter superWriter; 
                if (rendering) { 
                        delegate.writePrefix(writer, cycle, this, validator); 
                        myWriter.init(writer, delegate, validator, cycle); 
                        superWriter = myWriter; 
                } else { 
                        superWriter = writer; 
                } 
                
                super.renderComponent(superWriter, cycle); 

                String name = getName(); 

                if (!rendering && !isDisabled()) { 
                        String value = cycle.getRequestContext().getParameter(name); 
                        updateValue(value); 
                } 

                if (rendering) { 
                        delegate.writeSuffix(writer, cycle, this, validator); 
                        myWriter.clear(); 
                } 
        } 
        
        protected void updateValue(String value) { 
                Object objectValue = null; 
                IValidationDelegate delegate = getForm().getDelegate(); 

                delegate.recordFieldInputValue(value); 

                try { 
                        objectValue = getValidator().toObject(this, value); 
                } catch (ValidatorException ex) { 
                        delegate.record(ex); 
                        return; 
                } 

                setValue((String)objectValue); 
        }        
}

ValidTextArea.jwc

java代码:

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE component-specification 
      PUBLIC "-//Apache Software Foundation//Tapestry Specification 3.0//EN" 
      "http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd"> 
<!-- generated by Spindle, http://spindle.sourceforge.net --> 

<component-specification class="com.tomxp.web.components.valid.ValidTextArea" allow-body="no"> 
  <description> 
  A multi-line valid text area. 
  </description> 
  
  <parameter name="value" type="java.lang.String" required="yes" direction="form"/> 
  
  <parameter name="disabled" type="boolean" direction="in"/> 

  <parameter name="validator" type="org.apache.tapestry.valid.IValidator" required="yes" direction="in"> 
    <description> 
    Converts value to a string and parses strings back into object values. 
    </description> 
  </parameter> 
    
  <parameter name="displayName" type="java.lang.String" required="yes" direction="auto"> 
    <description> 
    Name used by FieldLabel and when generating validation error messages. 
    </description> 
  </parameter> 
    
  <reserved-parameter name="name"/> 
  
  <property-specification name="name" type="java.lang.String"/> 
  <property-specification name="form" type="org.apache.tapestry.IForm"/> 
</component-specification>

java代码:

package com.tomxp.web.components.valid; 

import org.apache.tapestry.IMarkupWriter; 
import org.apache.tapestry.IRequestCycle; 
import org.apache.tapestry.form.IFormComponent; 
import org.apache.tapestry.valid.IValidationDelegate; 
import org.apache.tapestry.valid.IValidator; 

/** 
* @author Peter Butler 
*/ 
public class WriterErrorDecorator implements IMarkupWriter { 
        private IMarkupWriter actual; 
        private IValidationDelegate delegate; 
        private IValidator validator; 
        private IRequestCycle cycle; 
        private IFormComponent field; 

        public WriterErrorDecorator(IFormComponent field) { 
                this.field = field; 
        } 
        
        public void init(IMarkupWriter actual, IValidationDelegate delegate, IValidator validator, IRequestCycle cycle) { 
                this.actual = actual; 
                this.delegate = delegate; 
                this.validator = validator; 
                this.cycle = cycle; 
        } 
        
        public void clear() { 
                this.actual = null; 
                this.delegate = null; 
                this.validator = null; 
                this.cycle = null; 
        } 

        public void attribute(String name, int value) { 
                actual.attribute(name, value); 
        } 

        public void attribute(String name, boolean value) { 
                actual.attribute(name, value); 
        } 

        public void attribute(String name, String value) { 
                actual.attribute(name, value); 
        } 

        public void attributeRaw(String name, String value) { 
                actual.attributeRaw(name, value); 
        } 

        public void begin(String name) { 
                actual.begin(name); 
                validator.renderValidatorContribution(field, this, cycle); 
                delegate.writeAttributes(this, cycle, field, validator); 
        } 

        public void beginEmpty(String name) { 
                actual.beginEmpty(name); 
                validator.renderValidatorContribution(field, this, cycle); 
                delegate.writeAttributes(this, cycle, field, validator); 
        } 

        public boolean checkError() { 
                return actual.checkError(); 
        } 

        public void close() { 
                actual.close(); 
        } 

        public void closeTag() { 
                actual.closeTag(); 
        } 

        public void comment(String value) { 
                actual.comment(value); 
        } 

        public void end() { 
                actual.end(); 
        } 

        public void end(String name) { 
                actual.end(name); 
        } 

        public void flush() { 
                actual.flush(); 
        } 

        public IMarkupWriter getNestedWriter() { 
                return actual.getNestedWriter(); 
        } 

        public void print(char[] data, int offset, int length) { 
                actual.print(data, offset, length); 
        } 

        public void print(char value) { 
                actual.print(value); 
        } 

        public void print(int value) { 
                actual.print(value); 
        } 

        public void print(String value) { 
                actual.print(value); 
        } 

        public void println() { 
                actual.println(); 
        } 

        public void printRaw(char[] buffer, int offset, int length) { 
                actual.printRaw(buffer, offset, length); 
        } 

        public void printRaw(String value) { 
                actual.printRaw(value); 
        } 

        public String getContentType() { 
                return actual.getContentType(); 
        } 
}

对于TextArea的长度验证，的确只有自己写组件。特别是当页面中已经使用Tapestry的FieldLabel+Validator效验的时候，如果仅仅是简单的将JS写在HTML里面，就会出现无法于Tapestry动态生成的JavaScript整合的问题。。。

我看了一下Ewaves贴的代码，似乎没有贴出.script文件。我自己写的组件虽然和上面的代码完全不一样，但是.script文件却是可以通用的，它能够自动生成动态的javascript。

java代码:

<?xml version="1.0" encoding="GBK"?> 
<!-- $Id: DatePicker.script,v 1.5 2004/03/09 18:23:50 hlship Exp $ --> 
<!DOCTYPE script PUBLIC 
        "-//Apache Software Foundation//Tapestry Script Specification 3.0//EN" 
        "http://jakarta.apache.org/tapestry/dtd/Script_3_0.dtd"> 
  
<script> 
<!-- 

input symbols: 

  textAreaScript: The TextAreaScript component. 
  
output symbols: 

  formValidateFunction The name of a form validator function that validates the fields. 

--> 
<include-script resource-path="/org/apache/tapestry/valid/Validator.js"/> 

<input-symbol key="textAreaScript" class="com.cdmcs.tapestry.jwc.TextAreaScript"/> 

<set key="name" expression="textAreaScript.name"/> 

<set key="required" expression="textAreaScript.required"/> 
<set key="minimumLength" expression="textAreaScript.minimumLength"/> 
<set key="maximumLength" expression="textAreaScript.maximumLength"/> 

<set key="requiredMessage" expression="textAreaScript.requiredMessage"/> 
<set key="minimumLengthMessage" expression="textAreaScript.minimumLengthMessage"/> 
<set key="maximumLengthMessage" expression="textAreaScript.maximumLengthMessage"/> 

<set key="numberFormatEnable" expression="textAreaScript.numberFormatEnable"/> 
<set key="numberLengthMessage" expression="textAreaScript.numberLengthMessage"/> 
<set key="numberLength" expression="textAreaScript.numberLength"/> 

<let key="baseName"> 
  document.${textAreaScript.form.name}.${name}        
</let> 

<let key="formValidateFunction" unique="yes"> 
  validate_${name}        
</let> 



<body> 



<![CDATA[ 
function ${formValidateFunction}() 
{ 
  var field = ${baseName}; 
  var keycode = window.event.keyCode; 
  
  if ( ${numberFormatEnable} && !field.value.match(/^/d{11}$/) ) 
  { 
          if( field.value.length == 0 ) 
                  return true; 
        return validator_invalid_field(field, "${numberLengthMessage}"); 
  } 
                  
  if ( ${required} && field.value.length==0 ) 
  { 
          return validator_invalid_field(field, "${requiredMessage}"); 
  } 
                  
  if ( ${required} && field.value.length<${minimumLength}) 
  { 
     return validator_invalid_field(field, "${minimumLengthMessage}"); 
  } 
                  
  if ( ${required} && field.value.length>${maximumLength}) 
  { 
     return validator_invalid_field(field, "${maximumLengthMessage}"); 
  } 

  return true; 
} 

]]> 

</body> 
</script>