select标签施用

struts2中s:select标签的使用
1.第一个例子：

<s:select list="{'aa','bb','cc'}" theme="simple" headerKey="00" headerValue="00"></s:select>

2.第二个例子：

<s:select list="#{1:'aa',2:'bb',3:'cc'}"? label="abc" listKey="key" listValue="value"? headerKey="0" headerValue="aabb">

3.第三个例子：

<%
java.util.HashMap map = new java.util.LinkedHashMap();
map.put(1,"aaa");
map.put(2,"bbb");
map.put(3,"ccc");
request.setAttribute("map",map);
request.setAttribute("aa","2");
%>
<s:select list="#request.map"? label="abc" listKey="key" listValue="value"
value="#request.aa"? headerKey="0" headerValue="aabb"></
s:select
>
headerKey headerValue 为设置缺省值

4.第四个例子

public class Program implements Serializable {
??? /**??? serialVersionUID */
??? private static final long serialVersionUID = 1L;
??? private int programid;
??? private String programName;
??? public int getProgramid() {
??????? return programid;
??? }
??? public void setProgramid(int programid) {
??????? this.programid = programid;
??? }
??????? public String getProgramName() {
??????? return programName;
??? }
??? public void setProgramName(String programName) {
??????? this.programName = programName;
??? }
}

在 xxx extends? extends ActionSupport {
??? private? List<Program> programs ;
?????? public List<Program> getPrograms() {
??????? return programs;
??? }
??? public void setPrograms(List<Program> programs) {
??????????? this.programs = programs;
??? }
}


在jsp页面
????? <s:select list="programs "? listValue="programName " listKey="programid "? name="program" id="program"
???????????? headerKey="0l" headerValue="??? "?? value="bean.programid "
???????????? ></s:select>
红色部分为在action里面的list,黄色为<option value="xxx">value</option>对应bean里面的字段programName
绿色为<option value="xxx",对应bean里面的字段programid

紫色为设定select被选中的值,s:select 会自动在 bean选中 key对应的值

?