📄 入門 24 - 自訂validator驗證器 - javaworld@tw.htm
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</validator></PRE></DIV></DIV><BR> 在<javascript>標籤之間的，是用來撰寫自訂客戶端驗證的JavaScript時使用，要使用它必須在JSP頁面的表單提交按鈕上增加onsubmit事件處理，例如：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><html:form action=<SPAN class=java-quote>"Login"</SPAN> onsubmit=<SPAN class=java-quote>"<SPAN class=java-keyword>return</SPAN> validateLoginForm(<SPAN class=java-keyword>this</SPAN>);"</SPAN>></PRE></DIV></DIV><BR> 然後在JSP頁面中使用<html:javascript/>標籤將所需的JavaScript寫出：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeContent><PRE><html:javascript formName=<SPAN class=java-quote>"loginForm"</SPAN>/></PRE></DIV></DIV><BR> <javascript>會自動生成JavaScript
validateXXXX()方法，其中XXXX是ActionForm名稱，在客戶端當按下按鈕時，validateXXXX()方法會被呼叫並執行客戶端的JavaScript驗證工作。<BR> 在伺服端，您要撰寫一個驗證類別，該類別必須包括static的validateXXX()方法，並必須包括指定的參數，最後傳回true或false表明驗證成功或失敗，例如：
<DIV class=code
style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
<DIV class=codeHeader
style="BORDER-BOTTOM-STYLE: solid"><B>MyValidator.java</B></DIV>
<DIV class=codeContent><PRE><SPAN class=java-keyword>public</SPAN> class MyValidator <SPAN class=java-keyword>implements</SPAN> Serializable {
<SPAN class=java-keyword>public</SPAN> <SPAN class=java-keyword>static</SPAN> <SPAN class=java-object>boolean</SPAN> validateSomeProperty(java.lang.<SPAN class=java-object>Object</SPAN> object,
org.apache.commons.validator.ValidatorAction action,
org.apache.commons.validator.Field field,
org.apache.struts.action.ActionErrors errors,
javax.servlet.http.HttpServletRequest request) {
........
}
}</PRE></DIV></DIV><BR> 如果驗證失敗，errors可以讓您將一些驗證失敗訊息加入其中，最後可使用<html:errors/>顯示在指定的頁面上。<BR> 自訂Validator時，預設都是找尋application.properties中的key-value對應，如果需要額外的訊息，可以在該檔案中加入。<BR> 有關更多自訂驗證器的方式，可以參考validator-rules.xml與Validator的原始碼檔案。
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