Struts原理与实践（6）

<!--①-->
classname="org.apache.struts.validator.FieldChecks"
method="validateRequired"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionErrors,
javax.servlet.http.HttpServletRequest"
<!--②-->
msg="errors.required">
<!--③-->
<![CDATA[<![CDATA[
functionvalidateRequired(form){
varisValid=true;
varfocusField=null;
vari=0;
varfields=newArray();
oRequired=newrequired();
for(xinoRequired){
varfield=form[oRequired[x][0]];

if(field.type=='text'||
field.type=='textarea'||
field.type=='file'||
field.type=='select-one'||
field.type=='radio'||
field.type=='password'){

varvalue='';
//getfield'svalue
if(field.type=="select-one"){
varsi=field.selectedIndex;
if(si>=0){
value=field.options[si].value;
}
}else{
value=field.value;
}

if(trim(value).length==0){

if(i==0){
focusField=field;
}
fields[i++]=oRequired[x][1];
isValid=false;
}
}
}
if(fields.length>0){
focusField.focus();
alert(fields.join('/n'));
}
returnisValid;
}

//Trimwhitespacefromleftandrightsidesofs.
functiontrim(s){
returns.replace(/^/s*/,"").replace(//s*$/,"");
}

]>

publicstaticbooleanvalidateRequired(Objectbean,
ValidatorActionva,Fieldfield,
ActionErrorserrors,
HttpServletRequestrequest){

Stringvalue=null;
if(isString(bean)){
value=(String)bean;
}else{
value=ValidatorUtil.getValueAsString(bean,field.getProperty());
}

if(GenericValidator.isBlankOrNull(value)){
errors.add(field.getKey(),Resources.getActionError(request,va,field));
returnfalse;
}else{
returntrue;
}
}

#Standarderrormessagesforvalidatorframeworkchecks
errors.required={0}isrequired.
errors.minlength={0}cannotbelessthan{1}characters.
errors.maxlength={0}cannotbegreaterthan{1}characters.
errors.invalid={0}isinvalid.
errors.byte={0}mustbeabyte.
errors.short={0}mustbeashort.
errors.integer={0}mustbeaninteger.
errors.long={0}mustbealong.
errors.float={0}mustbeafloat.
errors.double={0}mustbeadouble.
errors.date={0}isnotadate.
errors.range={0}isnotintherange{1}through{2}.
errors.creditcard={0}isaninvalidcreditcardnumber.
errors.email={0}isaninvalide-mailaddress.

<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEform-validationPUBLIC"-//ApacheSoftwareFoundation
//DTDCommonsValidatorRulesConfiguration1.0//EN"
"http://jakarta.apache.org/commons/dtds/validator_1_0.dtd">
<form-validation>

<formname='userInfoForm'>

mask
^/w

minlength
2

maxlength
16

minlength
2

maxlength
16

</form>

</form>