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 ?°?-¤é?μ????o?μ?-é?????é  ??·????￡?? ??± Tomcat ?o?¨  ??è?? IBM ???o J2EE ?o?¨????¨ WAS CE ?°??? V1.1 ?o§??: ??-?o§ Ted Bergeron ([email protected]), ?????§?oo, Triview, Inc. 2006 ?1′ 10 ? 10 ?￥ ?°?????¨ Web ?o?¨?¨?o??-?°??ˉè??¤??±?????-???o?°??éaèˉé???éè|?????ˉè???·??′é???è??????￥è3?o???¤????oo?é????12è????￥è???a?-￥éa¤ aa è??ˉè????ˉ?è′????¤§éé?é￠??o§?????ˉé???°???? Java ?13?°??-???￥?o?3¨é??éaèˉ?????????¤?o??¨?????-??Ted Bergeron ?°??¨?????|??????¨ Hibernate Annotations ? Validator ??????¨ Web ?o?¨?¨?o??-è???????o?1???′?¤éaèˉé?è???????????§?·￥?·?????ˉ??￥??-￡???è?3????oo????????é?±?????oo??¨??????????è??è??§?·￥?·???¤??°±?ˉ??￥?¨èa?·±??o?¨?¨?o??-???§????¨è??§?·￥?·??è?o???￥èˉ′??è??§?·￥?·?¨????oo?è±è′1?¤§é??é′?￥??????¨?3?1??°±?ˉ??￥????-è·????????1?????￠è??§?·￥?·??????o???ˉ??￥?°????oo??ˉ???′é??è?o?±???????°?Hibernate Annotations ? Validator ??????°±?ˉ???§è???·??·￥?·?
???§?1?éè|?oè§￡????1 ?¨éèˉ?????1????oèˉ￥?ˉ1 Java ?13?°??? 5???°¤???ˉ?3¨é???JSP 2.0??????o?????-???o?o???o???-????????1??¨ TLD ??-???1?o???o???°???????é??ˉ JSP 2.0 ??°?1?§??? Hibernate ? Spring ?????????a?o????oè§￡?èˉ·?3¨??3?????????¨ Hibernate ?￥???°??1?§???1?ˉ??￥?¨èa?·±??o?¨?¨?o??-????¨ Hibernate Validator? Java SE 5 ??o Java èˉ-è¨????o???¤éè|??￠??o?è?????è??????￠??o?è??ˉè?é????| ?3¨é è???·????·¨?¤§?????¨ ?3¨é???????°±???o?·??o????a???????o§???°????????o Java ?±?????¨?Hibernate ?¨?·??·￥??? *.hbm.xml ?????·2?????¤?1′?o???è????¨ XDoclet ?￥èa?¨???°è???a?????????|???·￥???o?o XML ??????é￡?°±??é???ˉ1?ˉ??a?éè|???1?±?§é??′?°è???¤??a???????±????1? XML ???°???￡???????¨ HibernateDoclet ?ˉ??￥???è???aè??¨??èˉ·????? 1 ???o????-???????ˉè?éè|???????è?¤èa?·±? HibernateDoclet ????ˉ?è|????¨? Hibernate ?????doclet ????ˉ?¨è?è????1?ˉ???ˉ?¨???????o??è￠?????°?o Javadoc é￡?????3¨é??-?o?Hibernate Annotations???|?? 2 ??¤o??éè????????a???????????°?±???1?3???·????è?è????ˉ?¨?§?￥?ˉ1è??o?1??è?è??1è?? ??? 1. ????¨ HibernateDoclet ? Hibernate ???°??￡?? /** * @hibernate.property column="NAME" length="60" not-null="true" */ public String getName() { return this.name; } /** * @hibernate.many-to-one column="AGENT_ID" not-null="true" cascade="none" * outer-join="false" lazy="true" */ public Agent getAgent() { return agent; } /** * @hibernate.set lazy="true" inverse="true" cascade="all" table="DEPARTMENT" * @hibernate.collection-one-to-many class="com.triview.model.Department" * @hibernate.collection-key column="DEPARTMENT_ID" not-null="true" */ public List getDepartment() { return department; } ??? 2. ????¨ Hibernate Annotations ? Hibernate ???°??￡?? @NotNull @Column(name = "name") @Length(min = 1, max = NAME_LENGTH) // NAME_LENGTH is a constant declared elsewhere public String getName() { return name; } @NotNull @ManyToOne(cascade = {CascadeType.MERGE }, fetch = FetchType.LAZY) @JoinColumn(name = "agent_id") public Agent getAgent() { return agent; } @OneToMany(mappedBy = "customer", fetch = FetchType.LAZY) public List getDepartment() { return department; }?|?????¨ HibernateDoclet??é￡?1?′?°?? XML ?????è?è????è??è·éèˉˉ?????¨ ?3¨é???¨??èˉ???°±?ˉ??￥?￡?μ?o???¤éèˉˉ???è?|??¨??è???????¨?o???￥?? IDE??é￡?1?¨??è????°±?ˉ??￥?￡?μ?oé¨?éèˉˉ??¨???¤′???o?o?¨?¨?o?????ˉ??￥???¨ hbm2ddl ?·￥?·??oèa?·±??°???o?? hbm.xml ??????-?? DDL????oéè|?????ˉ aa ?ˉ?|name ?±?§???¤§é??o|??é???ˉ 60 ??a?-??|???è DDL ?oèˉ￥?·???é??o?o|? aa é?è￠??? HibernateDoclet é?1?·????° DDL ??-???????¨?3¨é?????????ˉ??￥??￥?±??????1??èa?¨?? DDL? ?°????è???¤?§??￡?????°?1??é??ˉ??￥????¨????è??3¨é??????′??o????????¨?3¨é???ˉ??￥?¨???o???é?￥???é??o|??????????èˉ??a?ˉ?é?o|?′??????1?????éè|?? XML ?????????-??¤§??????ˉ?ˉ??￥è??é????o??¨????ˉ?????|è?è????é??o?3¨é?é??o|?é¤?o??? 2 ???o??3¨é?1?¤??è??ˉ??￥??????oéaèˉ??o|???????é¨??o|??|???? @Max(value = 100) @Min(value = 0) @Past @Future @Email?¨é???????????è??o?3¨é????èμ·?± DDL ???￡?￥?o|??????????@Future ?1????ˉ????aé???????????è??ˉ??￥??1??éè|???o?????o|??3¨é? éaèˉ??o?¨?¨?o?± ???éaèˉ??￡???ˉ????a?|?oo??è???è??¨?é????????¤????oo?é????????¨?1????±è?è????§éaèˉ????è?ˉ??￥è????o??é′?????ˉ?è????é′?ˉ?|è??¤??￥è?￥?¨è???a?°?1??????￥é¨??è????èμ·???oé·?′é????????￠è?¨??|??¨???o?¨?¨?o?±??-???o?1???′?¤éaèˉ?éè|???é′?ˉ??￥??¤§?°??°??é￡?1?oè?o??|?1?°±??è????ˉ?|è|?¨?¤??a?±?????-è?è????§éaèˉ??è???????a?o?¨?¨?o????è???¨?·????¨????a?¨?·???ˉ???????¨???·?￥???o????a???·??¨è???a?o?¨?¨?o??-????è?è?éaèˉ???????|???? è§???? éè? JavaScript è?è?éaèˉ?ˉ??￥é????????¨??¤è?è??o¤?o??è???·?ˉ??￥????′?￥???¨?·??éa??¨?·?ˉ??￥?|?¨ JavaScript?????-¤è???a?±????éaèˉ??￥?è|??????ˉ?′?1????ˉé???ˉ1?éè|??è?è?????éaèˉ?ˉ??é???? ?§???¨?? éaèˉ??é???¨????¨??ˉ?é?è???-è?è??¤??è???a?±?????-???￡???ˉ??￥??￥é????a?1???¨é??1???¤?éaèˉ????|???¨?·????°?¨?·?????§???¨?ˉ??￥?¨è?è??¤??1??￡?￥?????¨?·??ˉ?|?·2???-?¨? ????? ???ˉ1?¤??????é?è?éaèˉé???é??é????°????±??-????|?????|?????a????¨???ˉ1è±??èμ·?￥?????°±?oèˉ￥????¨????¨???¤?????ˉ1è???a????¨???????ˉè?è????è?¤? DAO?? ?¨?°???°è??è???a?±????????oèˉ￥?·2???ˉ????o??°?????|?-¤???§è?????????é?￡?￥??è??????éè|??é?é??o?1??????1é??¨?1???è?′?éμ??a?1?????????????| e-mail ?°???°±?oèˉ￥???????a??? e-mail ?°????1?ˉé????????¨?-¤?¤?è·éèˉˉ???ˉ?o§??ˉ??￥é??? SQLException éèˉˉè|?￥?? DBMS?? è??ˉé????ˉ??￥????￥éaèˉ??°?1??3???????-￡?¨???o??o?¨?¨?o?ˉ?°???o??????￠?·?o???°?￥è??ˉè????·?????????￠?·?o??|??o?¨?¨?o????o bug???¤§é¨??o?¨?¨?oé??ˉè???? bug????é￡?1?????°???1?ˉè???è￠??é???°???o??¨è??§??μ??-???|?èμ°è????°±?ˉ??￥???°?????°?????1???éè|??è??o?°???ˉ?|?ˉ??￥??é¤????￥??|????é¤? ?¨???? è??ˉè?è?éaèˉ?????a??3?°?1??????éè|è??é??¤é¨??????1??éè|?oè§￡??1?§?°??????|???????é?è??ˉè???è|?±?¨?·è3?°???????aè?3?????ˉ??è??ˉ??￥?ˉ????a?μèˉ?·???1?ˉ??￥?ˉ????a e-mail ?°????ˉ??￥????¨?¨???±?éaèˉ?￥??????¨?·????????oè??§????ˉ?è?è?éaèˉ????§????1?3?ˉ?ˉ1????éaèˉ????¨ Commons Validator???1??¨?§???¨??-??????????oéaèˉé?è??Commons Validator ?ˉ??￥?? JavaScript ?￥?ˉ1è§????-?éaèˉè?è??¤?????ˉ Commons Validator ?1?èa?·±???oé·?????aè??¤?????éaèˉé?é￠???1????°éaèˉ?????ˉé????-?°?o XML ??????-?Commons Validator è￠?è??è???¨?￥?? Struts ??èμ·????¨??è???2????????§?????1?3?¨?o?¨?¨?o?±é′é?¨éaèˉ??￡°?? ?¨è§????§éaèˉ?-?￥????é???¨éèˉˉ????????°?¤?è??oéèˉˉ?ˉè?è????¤?????§èˉ?￥??è??è?????è?è|éè???????a??￥???¨?·?é￠?￥é2?-￠?o?°éèˉˉ?é?¨é￠?è?è???1?3è?è?éaèˉ?ˉ??￥??¤§?°?￠??o?¨?·?ˉ1?o?o?¨?¨?o??è§￡????1???ˉ??Commons Validator ?1??2???ˉ1?-¤????ˉ???è????? HTML ????è?????????? maxlength ?±?§?￥??éaèˉ?1é???è?¨?????1?????????a????·??%???￥è?¨?¤oè|è??￥????ˉ????é?????è??o????ˉé?è￠????????° HTML ???￡??-?o??|??3??????1 name ?±?§?￥?ˉ? 75 ??a?-??|??è???ˉ 60 ??a?-??|??é￡?1éè|?1?¨?¤?°?°?1?￠???¨???¤?o?¨?¨?o??-??é???é?éè|?? ?′?° DDL ?￥?￠?¤§?°???o??é??o|??éè? HibernateDoclet? hbm.xml ? Hibernate Annotations??? ?′?° Commons Validator XML ?????°??¤§???￠???° 75? ?′?°????è???a???3? HTML è?¨?????￥????1 maxlength ?±?§??′?￥???1?3?ˉ????¨ Hibernate Validator?éaèˉ????1é?è￠?éè??3¨é ?·????°?o?¨???±??-?????è???ˉ1?????éaèˉ?¤???ˉ???|?é???????¨??? Hibernate??è???a Validator ?°±?ˉ??￥?¨ DAO ? DBMS ?±?1???éaèˉ??¨??é￠???o???·????￡????-???°????¨ reflection ? JSP 2.0 ???-??????¤?§è?????a?-￥éa¤????è?????¨?3¨é ??oè§???±?¨?????￡???è??ˉ??￥??é¤?¨è§????-????¨????????????é?è?? ?¨??? 3 ??-??dateOfBirth è￠??3¨é??o NotNull ?è?????￥?? Hibernate ? DDL ????￡???ˉ1è???a??·????o????aé??o?o|?????￥?????aè|?±?￥???é???ˉ?1??￥???￡?￥?o|??e-mail ?°??1?ˉé??o?????é???1é e-mail ?°????????è?????????aé??o?o|??????ˉ???????1éè??§???????￡?￥?o|?? ??? 3. éè? Hibernate Annotations è?è????°????è?3??1?? /** * A Simplified object that stores contact information. * * @author Ted Bergeron * @version $Id: Contact.java,v 1.1 2006/04/24 03:39:34 ted Exp $ */ @MappedSuperclass @Embeddable public class Contact implements Serializable { public static final int MAX_FIRST_NAME = 30; public static final int MAX_MIDDLE_NAME = 1; public static final int MAX_LAST_NAME = 30; private String fname; private String mi; private String lname; private Date dateOfBirth; private String emailAddress; private Address address; public Contact() { this.address = new Address(); } @Valid @Embedded public Address getAddress() { return address; } public void setAddress(Address a) { if (a == null) { address = new Address(); } else { address = a; } } @NotNull @Length(min = 1, max = MAX_FIRST_NAME) @Column(name = "fname") public String getFirstname() { return fname; } public void setFirstname(String fname) { this.fname = fname; } @Length(min = 1, max = MAX_MIDDLE_NAME) @Column(name = "mi") public String getMi() { return mi; } public void setMi(String mi) { this.mi = mi; } @NotNull @Length(min = 1, max = MAX_LAST_NAME) @Column(name = "lname") public String getLastname() { return lname; } public void setLastname(String lname) { this.lname = lname; } @NotNull @Past @Column(name = "dob") public Date getDateOfBirth() { return dateOfBirth; } public void setDateOfBirth(Date dateOfBirth) { this.dateOfBirth = dateOfBirth; } @NotNull @Email @Column(name = "email") public String getEmailAddress() { return emailAddress; } public void setEmailAddress(String emailAddress) { this.emailAddress = emailAddress; }
??·???o?¨?¨?o ?¨ ??è?? ??è???¨?ˉ??￥??è??????a??·???o?¨?¨?o?????±?¤o?o?????-é?¨?è??è????3???￡????±?oè??ˉ????a?ˉ??￥?·￥????o?¨?¨?o?????-¤??￡???ˉ?????-è?¨è?o?????1?′??o?¤?????|????? 9 ?°±èé?o???-????? text.tag??è???a??·???o?¨?¨?o?·????-?????????¨?????￡??????￥?????????a?±????????-?????????¨???￡?????¨?oé???éè??￡?￥??? HTML ??′?????±?oè??ˉ????a?ˉ??￥?·￥????o?¨?¨?o????????o????a?¨è??§?±????o?¨?¨?o??-é??ˉ??￥???°?????è??????a Ant ???o?????Spring ? Hibernate XML ?°è￡??￡??????￥? log4j é????è???è??oé????ˉ????????é?1?????ˉ?¨????°?????????????è???a??·???o?¨?¨?o??o??￡???ˉé?????¨??
?|?éè|??Hibernate DAO ???°?1?ˉ??￥????¨ Validation Annotations??é???ˉ?¨ hibernate.cfg.xml ??????-????o?o Hibernate ?o????éaèˉè§?????′?¤????ˉèˉ·?è Hibernate Validator ????￡???ˉ??￥?¨ ?èèμ? ??è??-???°???3?é??￥????|???°????è?è·ˉ???¨?ˉ??￥?a?è·?????§???¨??-? InvalidStateException ????????1???a?ˉé? InvalidValue ?°??? ?ˉ1?§???¨?·???éaèˉ è|?§è?éaèˉ??éè|???o????a Hibernate ? ClassValidator ?????è???a?±?è?è?????????￡??·?ˉè?????é??????-¤??￥??a?ˉ1???è?è?éaèˉ??ˉ??a?±??￥è?è??????????§?1?3?ˉ???o????a???¨?·￥?·?±????ˉ1?ˉ??a?¨???ˉ1è±??-?¨????a ClassValidator ???????|??? 4 ??¤o?? ??? 4. ?¤?éaèˉ????¨?·￥?·?±? /** * Handles validations based on the Hibernate Annotations Validator framework. * @author Ted Bergeron * @version $Id: AnnotationValidator.java,v 1.5 2006/01/20 17:34:09 ted Exp $ */ public class AnnotationValidator { private static Log log = LogFactory.getLog(AnnotationValidator.class); // It is considered a good practice to execute these lines once and // cache the validator instances. public static final ClassValidator CUSTOMER_VALIDATOR = new ClassValidator(Customer.class); public static final ClassValidator CREDIT_CARD_VALIDATOR = new ClassValidator(CreditCard.class); private static ClassValidator 1.0 form formtags text /WEB-INF/tags/form/text.tag determine if field is required from Annotations required com.triview.web.Utilities Boolean required(java.lang.Object,java.lang.String)??? 7 èéèa Utilities ?±???????-????o???-?????????¨??????°??¨????-????????èˉ′è????é?????¨ Java ??￡????????￡??é?è￠????°?o????a TLD ?ˉ??￥???°????°??-??è???·???-??????°±?ˉ??￥????¨??????o??è??o???°é??ˉ?¨ Utilities ?±???-è?è??????????-¤??????éè|????·??è￥??????1è??o?±?? TLD ?????Utilities ??-????°????￥????-???????èo????èè|????¨è??o???°?????????·?oèˉ￥?ˉ????¨è???a???-?????? JSP é?μé￠??? ?¨??? 7 ??-?????o?o?¨ TLD ??-???¨????°??|?¤????aè?¨?¤o?????±?§?ˉ?|?ˉ Date ??1?3??¨è???a?±???-è|????°?ˉè??¤???￡???????ˉ???é?o?ˉ?1?????????o?????￡??????è?éè|?3¨? findGetterMethod() é¤?o?°è?¨è????èˉ-è¨??Expression Language??EL???1?3è?¨?¤o??customer.contact??è???￠? Java è?¨?¤o??customer.getContact()???1?¤??è??§è??o?o?????????? ??? 7. Utilities èé public static Boolean required(Object object, String propertyPath) { Method getMethod = findGetterMethod(object, propertyPath); if (getMethod == null) { return null; } else { return getMethod.isAnnotationPresent(NotNull.class); } } public static Boolean isDate(Object object, String propertyPath) { return java.util.Date.class.equals(getReturnType(object, propertyPath)); } public static Class getReturnType(Object object, String propertyPath) { Method getMethod = findGetterMethod(object, propertyPath); if (getMethod == null) { return null; } else { return getMethod.getReturnType(); } }?-¤?¤?ˉ??￥???￥?°??°?¨è?è???????¨ Validation annotations ?ˉ?¤?1??1???ˉ??￥????°???¨?ˉ1è±?? getter ?1?3???1??￡?￥è???a?1?3?ˉ?|????3???????3¨é ? ??? 8 ??-???o? JSP ???-è?è??o?????è???·?°±?ˉ??￥?é?￥????3?é¨??o??-¤?¤??è?é?????aè?¨??????????aé???????¤??aè??￥????è??o?é??ˉéè??¨ form.tld ??????-?￡°?????-?????è?è???°?????-?????è￠?è??è???????¨?oè???o?????è???·?°±?ˉ??￥??1??éè|?è?????????? JSP ?ˉ??￥????1?′?¤????ˉ?éé?1??3é???±?§?ˉ propertyPath????????¨ EL ??|?·?°è???a????°??o?¨???±?±?§???°±??ˉ????¨ Spring MVC ? bind ???-?????·? ??? 8. ????a???è?¨????? JSP é?μé￠text.tag ????????′?o??￡???¤a?¤§?o?????￥????¨è????????-¤??? 9 ???o?o????-?3é??é¨??? ??? 9. ???-????? text.tag èé
????é?????°±?ˉ??￥??o propertyPath ?ˉ???éè|??±?§?size? maxlength ? required é??ˉ??￥????￥?objectPath var è￠?è???????o?¨ propertyPath ??-???¨??±?§????ˉ1è±?????-¤???|? propertyPath ?ˉ customer.contact.fax.number?? é￡?1 objectPath ?°±?oèˉ￥è￠?è???????o customer.contact.fax??????°?¨?°±????¨ Spring ? bind ???-??????°?o????±?§??ˉ1è±????è????°?ˉ1è±??éè???????ˉ1????±?§?????????¨??￥???￥???￡?￥è???a???-???¨?·?ˉ?|?·2???????/?￥1????ˉ?|????±?§?ˉ??é?????è??è?¨?????oo?è|????3¨é??-è??????ˉé???éè|???????o?????/?￥1??????è???§???¨??o?éè|??è???????o?????è?¨?·?ˉè??1????????oè???a????????|?è?¨?????oo??2????o required ???????é￡?1?°±?ˉ??￥è°?¨è???aè?¨? TLD ? required ???°?è???a???°è°?¨?o?¨ TLD ??????-???°??1?3?è???a?1?3????°?￡?￥ @NotNull ?3¨é???|?????°???a?±?§?·?è???a?3¨é???°±?° labelClass ?éè???????o??é?????ˉ??￥?±?????°??????-￡???? maxlength ??￥?è???a??ˉ?|?ˉ????a Date? ?￥???￥????¨ Spring ?￥?????° propertyPath ????è???ˉ??é￠????·?a?????°???è???a?±?§??ˉ1è±????è??è???¨?? label ? input HTML ???-???????¨ status.expression ? status.value? input ???-??1?ˉ??￥????¨????a?¤§?° maxlength ??￥?é????±??￥????|??é￠?·2????????±?§?ˉ????a Date???°?¨?°±?ˉ??￥?·??? JavaScript ?￥??o????ˉ??￥?¨ ?èèμ? ??è???°????a???￥???￥???????é??￥????3¨???1??éè|é??￥?±?§?è??￥ ID ???? ID ????-??ˉ?¤?1??????è???a JavaScript ?￥?éè|????a??? ID ?￥?1éè??￥?????????ˉ _button? ?????ˉ??￥?° ?°è￡?°????a span ???-???-??è???·?è??è?¨?????oo??¨é?μé￠??-?·????????????????|?¨?￥?ˉ??±???????????????? 8 ???o?o????a??o????¨???·??·???????????????????é¨??ˉ?￡?￥ Spring ?ˉ?|??oè???a?±?§?￥?????¤o?o????aéèˉˉ???1??????aéèˉˉ??????èμ·???¤o? ????¨ CSS???°±?ˉ??￥?ˉ1??é????è?è?????è￡é￥° aa ???|??è?????????￥?o￠è2???¤o??¨???è?1?????¤o????a??·???è????¨????aè?ˉ????￥è￡é￥°????¨??? 10 ??-???°??é????????-?è??????é?è2??è???é￠???¤o????a?o￠è2???·???¨ Firefox ??￥????????????1??μè§?¨??-?????|??ˉ?¨ IE ??-?è????¨?·|è?1????????a?°??-?è?ˉ????? ??? 10. ?ˉ1??é???è?è?è￡é￥°? CSS ??￡?? label.required { color: black; background-image: url( /images/icons/flag_red.png ); background-position: left; background-repeat: no-repeat; } label.required:after { content: '*'; } label.optional { color: black; }?￥?è??￥?èa?¨???¨?3è?1????????a JavaScript ?￥???????ˉ1???????è??????-￡???? maxlength ?±?§?ˉ??￥é2?-￠?¨?·è??￥?¤a?¤??????èμ·?éèˉˉ??ˉ??￥???± text ???-??￥??oè??￥??±?è???????????°???±????ˉ??￥????1 text ???-?????¨ HTML??è???ˉ XHTML???|????è???·????ˉ??￥???¤aè′1??°è·???·??-￡???èˉ-?1? HTML è?¨???è????é?-|?1??o?o???????????￥èˉ???°±?ˉ??￥???¨?o?o?????? Web ????????1? ?°???????-???????? HTML ?????ˉ??￥?????é2?-￠???oéèˉˉ??o§??????ˉ?¨è§???±?1??2?????????￡???￥??-￡è?è?éèˉˉ?￡?￥??±?o?ˉ??￥????¨?±??±?§???°?¨?°±?ˉ??￥?·??????o???? JavaScript ?￥???°è??§?è??o???|??? 11 ??¤o?è?é? JavaScript ?1?ˉ??￥?ˉé?¨????¨?????è?¨???-é??ˉ??￥é?¨? ??? 11. ???? JavaScript éaèˉ?¨?o function checkRequired(form) { var requiredLabels = document.getElementsByClassName("required", form); for (i = 0; i < requiredLabels.length; i++) { var labelText = requiredLabels[i].firstChild.nodeValue; // Get the label's text var labelFor = requiredLabels[i].getAttribute("for"); // Grab the for attribute var inputTag = document.getElementById(labelFor); // Get the input tag if (inputTag.value == null || inputTag.value == "") { alert("Please make sure all required fields have been entered."); return false; // Abort Submit } } return true; }è???a JavaScript ?ˉéè???oè?¨??￡°??·??? onsubmit="return checkRequired(this);" è￠?è°?¨??è???aè??????°è·??·??éè|??±??è?¨???-?????′???±?o??????1??ˉ?ˉ?¨???-???è?°??-????¨è???a?±??????-¤??￡????éè? for ?±?§?￥?￥????è???a???-?è??￥?¨??èμ·?è??￥???|??????è??￥???o??o???°±????????????è-|????ˉ??è?¨???o¤?°±???????ˉ??￥????°?ˉ1è???aè??è?è???????????????¤??a?±????1????o?°è?è?éaèˉ? ?ˉ1?o?o?o JavaScript ??????éaèˉé??￥èˉ′????￥??ˉ????¨???o???°??è???ˉèaè??????¨??? 8 ??-?¨?ˉè??·2???3¨??°??é￠???￡???? οnclick="new Effect.SlideDown('creditCardHelp')"è???a???°?ˉ Script.aculo.us ?o???é¨???è???a?o????o???¤é??o§?????|??-￡?¨????¨ Script.aculo.us???°±éè|?ˉ1????o????1????¨ Prototype ?o? JavaScript éaèˉ?o?????a???-?ˉ?± Andrew Tetlaw ?¨ Prototype ?o???????o????èˉ·?? ?èèμ? ??è??-?é??￥????????????èμ?oè￠??·????°è??￥???±??? ?ˉ??￥????°????1 text.tag ?é?è??¨ input ???-???-??￥????a?±???° class="required" ?·????°è??￥???-?? label ???-???-??????±? CSS è§?????????′???? 10 ??-???o???? JavaScript éaèˉ?¨?o??|?è|?··?????¨??????-???￡??????? JavaScript ??￡??????￥?????¨?????±??????¨????¨?±????′￠??′?????????±?????1??￡?￥???-??±??? |
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