tapestry验证textarea

 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>

我这段代码另外还有个功能，是效验11位手机号码，因为11的长度远大于Tapestry提动的NumberValidator范围，没办法，只好自己写了，想偷懒都不行。