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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"/>
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