s:checkboxlist 預設選中

最後更新：2018-12-05 來源：互聯網

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大家對<s:checkboxlist/>的最大的疑問可能是：“如何在默認情況下，選中某些checkbox？”

答案其實很簡單，只需要將其“value”屬性設為你的要選中的值，如以代碼所示：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Struts 2 Cool Tags - <s:checkboxlist/ ></title>
    <s:head />
</head>
<body>
<h2><s:checkboxlist/></h2>
    <s:form action="Store" >
        <s:checkboxlist name="skills1"
label="Skills 1"
list="{ 'Java', '.Net', 'RoR', 'PHP' }"
value="{ 'Java', '.Net' }" />
        <s:checkboxlist name="skills2"
label="Skills 2"
list="#{ 1:'Java', 2: '.Net', 3: 'RoR', 4: 'PHP' }"
listKey="key"
listValue="value"
value="{ 1, 2, 3 }"/>
    </s:form>
</body>
</html>

當自己通過Action把值傳入 value時確總是選不中?

解決辦法。把要傳入Value的字元傳轉換為數組傳入到Value裡就好了

<s:bean name="com.action.IndexMerchant"
       id="f">
       <s:param name="id" value="${merchant.merchantId}"></s:param>
      </s:bean>
      <s:checkboxlist name="m" list="#f.tasteClasses" listKey="id"
       listValue="name" value="#f.tasteClassesByMerchantId"></s:checkboxlist>

這個value裡有值要對應listKey的值（listValue是顯示出來的值）。

<s:doubleselect />

大家看Struts 2的showcase的例子,<s:doubleselect />的用法如下所示:

<s:doubleselect

tooltip="Choose Your State"
            label="State"
            name="region" list="{'North', 'South'}"
            value="'South'"
            doublue="'Florida'"
            doubleList="top == 'North' ? {'Oregon', 'Washington'} : {'Texas', 'Florida'}"
doubleName="state"
            headerKey="-1"
            headerValue="---------- Please Select ----------"
            emptyOption="true" />

很多朋友問：“上面的‘list’屬性只有兩個值，如果我有三個或更多的值，‘doublelist’屬性應該如何設定呢？”

我建議的做法是先定義一個Map類型的對象，鍵為“list”的集合，值則為“doubleList”的集合，然後“doubleList”的OGNL寫成“#myMap[top]”，如以下代碼所示：

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
    <s:head />
</head>
<body>
<h2><s:doubleselect/></h2>
    <s:form action="Store" >
        <s:set name="foobar"
value="#{'Java': {'Spring', 'Hibernate', 'Struts 2'}, '.Net': {'Linq', ' ASP.NET 2.0'}, 'Database': {'Oracle', 'SQL Server', 'DB2', 'MySQL'}}" />
        <s:doubleselect list="#foobar.keySet()"
                          doubleName="technology"
doubleList="#foobar[top]"
label="Technology" />
    </s:form>
</body>
</html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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s:checkboxlist 預設選中

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