s:checkboxlist 默认选中

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

答案其實很簡單,只需要將其“value”屬性設為你的要选中的值,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 - &lt;s:checkboxlist/ &gt;</title>
    <s:head />
</head>
<body>
<h2>&lt;s:checkboxlist/&gt;</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>


当自己通过Action把值传入 value时确总是选不中?

解决办法。把要传入Value的字符传转换为 数组 传入到Value里就好了

<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>

这个value里有值要对应listKey的值(listValue是显示出来的值)。










<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'"
            doubleValue="'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 - &lt;s:doubeselect/ &gt;</title>
    <s:head />
</head>
<body>
<h2>&lt;s:doubleselect/&gt;</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>

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