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Compreendendo a estrutura do Validator dos suportes
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Estrutura do Validator dos suportes

Para validar os dados do formul�rio, a estrutura dos suportes fornece a funcionalidade. Pode ser uso validar os dados no lado do cliente as well as no lado do usu�rio. A estrutura dos suportes pode ser usada validar os dados do formul�rio no browser do cliente e emite-se certificados de java. Classificar do submarino seu do feij�o com a classe de DynaValidatorForm, o validation lateral do usu�rio do formul�rio pode ser realizado.

David Winterfeldt desenvolveu a estrutura do Validator como o add-on third-party ao Struts.Now a estrutura do Validator pode ser usado com ou sem os suportes e � uma parte do projeto das terras comuns de Jakarta. A estrutura do Validator pode ser usada sem fazer nenhuns ajustes extra e vem integrado com estrutura dos suportes.




Usando a estrutura do Validator

Ao coletor o validation governa para ser aplicado a um formul�rio, usos do Validator a lima de XML. No validation de XML as exig�ncias s�o aplicadas ao formul�rio e o aslo pode ser definido. Na estrutura do Validator, n�s podemos plug dentro nossos pr�prios validations feitos sob encomenda no Validator.

A estrutura do Validator usa duas limas da configura��o de XML chamadas validator-rules.xml e validation.xml. As rotinas padr�o do validation s�o definidas pelo validator-rules.xml e usadas em validation.xml. Para definir validations espec�ficos do formul�rio, validation.xml � usado. Definir os validations aplicou-se a um feij�o do formul�rio, o validation.xml




Estrutura de validator-rule.xml

O validation-rules.xmldeclares e atribui os nomes l�gicos �s rotinas do validation e � fornecido com a estrutura do Validator. Para cada rotina do validation, contem tamb�m o c�digo do Javascript do cliente-lado. Para executar validations espec�ficos, as rotinas do validation s�o os m�todos de java plugged no sistema.

A tabela seguindo contem os detalhes dos elementos nesta lima:

Element Attributes and Description
form-validation

This is the root node. It contains nested elements for all of the other configuration settings.

global

The validator details specified within this, are global and are accessed by all forms.

validator

The validator element defines what validators objects can be used with the fields referenced by the formset elements.

The attributes are:

  • name: Contains a logical name for the validation routine

  • classname: Name of the Form Bean class that extends the subclass of ActionForm class

  • method: Name of the method of the Form Bean class

  • methodParams: parameters passed to the method

  • msg:Validator uses Struts' Resource Bundle mechanism for externalizing error messages. Instead of having hard-coded error messages in the framework, Validator allows you to specify a key to a message in the ApplicationResources.properties file that should be returned if a validation fails. Each validation routine in the validator-rules.xml file specifies an error message key as value for this attribute.

  • depends: If validation is required, the value here is specified as 'required' for this attribute.

  • jsFunctionName: Name of the javascript function is specified here. 

javascript

Contains the code of the javascript function used for client-side validation. Starting in Struts 1.2.0 the default javascript definitions have been consolidated to commons-validator.  The default can be overridden by supplying a <javascript> element with a CDATA section, just as in struts 1.1.

O encaixe do Validator que � sabido tamb�m enquanto validator-rules.xml � fornecido com o jogo predefinido do validation geralmente usado governa como o comprimento requerido, m�nimo, comprimento m�ximo, Validation da data, validation do email address e mais. Se requerido, este jogo de r�guas b�sico pode tamb�m ser estendido com os validators feitos sob encomenda.




Estrutura de validation.xml

Esta lima da configura��o de validation.xml define que as rotinas do validation que � usado validar feij�es do formul�rio e tamb�m voc� podem definir a l�gica do validation para todo o n�mero de feij�es do formul�rio nesta lima da configura��o. Dentro dessa defini��o, voc� especifica validations que voc� quer se aplicar aos campos e � defini��o do feij�o do formul�rio neste uso da lima os nomes l�gicos de feij�es do formul�rio da lima de struts-config.xml junto com os nomes l�gicos de rotinas do validation da lima de validator-rules.xml amarrar junto os dois.

A seguinte tabela mostra os elementos da lima de validation.xml
Element Attributes and Description
form-validation This is the root node. It contains nested elements for all of the other configuration settings
global The constant details are specified in <constant> element within this element.
constant Constant properties are specified within this element for pattern matching.
constant-name Name of the constant property is specified here
constant-value Value of the constant property is specified here.
formset This element contains multiple <form> elements
form This element contains the form details.
The attributes are:
name
:

Contains the form name. Validator uses this logical name to map the validations to a Form Bean defined in the struts-config.xml file

field

This element is inside the form element, and it defines the validations to apply to specified Form Bean fields.

The attributes are:

  • property: Contains the name of a field in the specified Form Bean

  • depends: Specifies the logical names of validation routines from the validator-rules.xml file that should be applied to the field.

arg

A key for the error message to be thrown incase the validation fails, is specified here

var

Contains the variable names and their values as nested elements within this element.

var-name

The name of the criteria against which a field is validated is specified here as a variable

var-value The value of the field is specified here



O exemplo do formul�rio na lima de validation.xml � como segue:
<!-- An example form -->
<form name="logonForm">
<field property="username"
depends="required">
<arg key="logonForm.username"/>
</field>
<field property="password"
depends="required,mask">
<arg key="logonForm.password"/>
<var>
<var-name>mask</var-name>
<var-value>^[0-9a-zA-Z]*$</var-value>
</var>
</field>
</form>

Para permitir o validation front-end baseado no xml em validation.xml, o <html: o Tag do javascript> � usado. Na lima de validation.xml, por exemplo o c�digo: <html: o staticJavascript= verdadeiro/> " verdadeiro " " do dynamicJavascript= " do " logonForm do formName= do Javascript " gera o certificado de java do lado do cliente para o formul�rio �logonForm�. O <html: o javascript> gera o certificado do validation do local do cliente quando adicionado na lima do jsp.





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