jsp中html相關(guān)代碼

<tr>
  <td>請選擇展會：</td>
  <td colspan="3">
<select name="select" id="jieci" onchange="getChange()">
<option value="">選擇展會</option>
</select>
<script Language="JavaScript">
loadjieci("- 選擇展會 -");
</script>
<span>&nbsp;*</span>
<span id="mesjieci"></span>
   </td>

</tr>

js中相關(guān)代碼

<script Language="JavaScript">

function loadjieci(str) {
/** 異步加載屆次 */
$.getJSON("/DictsAction.do?actionType=jieci",
function (responseData, status) {
if (status != "") {
$("#jieci").empty();
$("<option/>").html("- 選擇展會 -").val("- 選擇展會 -").appendTo("#jieci");
$(responseData).each(function (n) {

$("<option/>").html(this.name).val(this.code).appendTo("#jieci");

});
//默認顯示請選擇
$("#jieci").val(str);


} else {
alert("屆次加載失敗！");
}
});
}

</script>

struts-config.xml中相關(guān)配置

<!-- ajax異步加載字典 -->
<action path="/DictsAction" type="oa.sys016.oagzxxgl.action.DictsAction" scope="request" />

java后臺代碼

package oa.sys016.oagzxxgl.action;


import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import net.sf.json.JSONArray;


import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import cn.com.chx.bo.AppBo;
/**
 * 通過ajax加載屆次選擇下拉列表的選擇項
 * @author liu
 *
 */
public class DictsAction extends Action{
private AppBo appBo = null;

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
// 設(shè)置編碼
response.setContentType("application/json;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();


appBo = new AppBo();


try {


// 獲取ActionType
String actionType = request.getParameter("actionType");


if (actionType != null && actionType.equals("jieci")) { // 查詢屆次
String jieciJson = getJieciJson();
out.print(jieciJson);
}


} catch (Exception e) {
e.printStackTrace();
} finally {
out.close();
}


return null;
}


private String getJieciJson() {
// 查詢屆次
List jieciList;
try {
jieciList = appBo.query("SELECT ID AS CODE,ZH_NAME AS NAME FROM ZH_GZ_INFOX");


List<Map<String, String>> lists = new ArrayList<Map<String, String>>();


if (jieciList.size() > 0) {
for (int i = 0; i < jieciList.size(); i++) {
Map<String, String> maps = new HashMap<String, String>();
maps.put("code",
(String) ((HashMap) jieciList.get(i)).get("CODE"));
maps.put("name",
(String) ((HashMap) jieciList.get(i)).get("NAME"));

lists.add(maps);


}
}
// [{"id":"1","name":"CIMT2015"},{"id":"2","name":"CCMT2016"}] 
JSONArray json = JSONArray.fromObject(lists);


return json.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

以上這篇ajax異步讀取后臺傳遞回的下拉選項的值方法就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持。