1. 前臺(tái)jsp,新建一個(gè)下拉控件
select id="seldvd" onChange="sel_onchange(this)">/select>
2. js部分,建一個(gè)function方法,利用ajax,指向 'getAllTypes.action' 的servlet部分,獲取傳來(lái)的下拉列表的數(shù)據(jù),動(dòng)態(tài)填充
span style="white-space:pre"> /span>function loadType(){ span style="white-space:pre"> /span>$.get( span style="white-space:pre"> /span> 'getAllTypes.action', span style="white-space:pre"> /span> function(data){ span style="white-space:pre"> /span> var $sel = $("#seldvd"); span style="white-space:pre"> /span> // console.log(data); span style="white-space:pre"> /span> for(var i = 0;idata.length;i++){ span style="white-space:pre"> /span> span style="white-space:pre"> /span>$item = $("option>/option>"); //添加option span style="white-space:pre"> /span> span style="white-space:pre"> /span>$item.val(data[i].id); //添加option的value ,span style="line-height: 1.5; white-space: pre-wrap; font-family: Arial, Helvetica, sans-serif;">span style="font-size:10px;">數(shù)據(jù)庫(kù)中用id和type保存的數(shù)據(jù)/span>/span> span style="white-space:pre"> /span> span style="white-space:pre"> /span>$item.html(data[i].type); //添加option數(shù)據(jù) span style="white-space:pre"> /span> span style="white-space:pre"> /span>$sel.append($item); //將option添加進(jìn)select span style="white-space:pre"> /span> } span style="white-space:pre"> /span> },'json' span style="white-space:pre"> /span> ); span style="white-space:pre"> /span>}
3. 新建一個(gè)servlet頁(yè)面,用來(lái)向Ajax返回?cái)?shù)據(jù)
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); ArrayListtypeInfo> typeList = new ArrayListtypeInfo>(); typeDao td = new typeDao(); typeList = td.getAllTypes(); JSONArray arr = new JSONArray(typeList);//這里導(dǎo)入需要轉(zhuǎn)json數(shù)據(jù)包 String jsString = arr.toString(); //響應(yīng)到客戶端 request.setCharacterEncoding("utf-8"); response.setContentType("text/plain;charset=utf-8"); response.getWriter().print(jsString); //返回下拉列表需要的json格式數(shù)據(jù) }
4. 那么問(wèn)題來(lái)了,這個(gè)數(shù)據(jù)來(lái)源在哪???當(dāng)然在數(shù)據(jù)庫(kù)(MySQL)。所以先要寫一個(gè)方法讀取數(shù)據(jù)庫(kù)中的數(shù)據(jù)
strong>typeInfo.java/strong>
import java.io.Serializable; public class typeInfo implements Serializable { private int id; private String type; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getType() { return type; } public void setType(String type) { this.type = type; } public typeInfo(){ } public typeInfo(int id, String type) { this.id = id; this.type = type; } }
TypeDao.java (需要導(dǎo)入JDBC包)
import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import model.typeInfo; public class typeDao extends baseDao { public ArrayListtypeInfo> getAllTypes(){ ArrayListtypeInfo> typeList = new ArrayListtypeInfo>(); Connection con = null; PreparedStatement psm = null; ResultSet rs = null; try { con = super.getConnection(); psm = con.prepareStatement("select * from types"); rs = psm.executeQuery(); while(rs.next()){ typeInfo types = new typeInfo(); types.setId(rs.getInt(1)); types.setType(rs.getString(2)); typeList.add(types); } } catch (Exception e) { System.out.println("顯示所有類型報(bào)錯(cuò):"+e.getMessage()); }finally{ super.closeAll(rs, psm, con); } return typeList; // } }
4. 好了,利用Tomcat ,現(xiàn)在打開網(wǎng)頁(yè),下拉列表就能顯示數(shù)據(jù)了
以上所述是小編給大家介紹的Ajax動(dòng)態(tài)為下拉列表添加數(shù)據(jù)的實(shí)現(xiàn)方法,希望對(duì)大家有所幫助,如果大家有任何疑問(wèn)請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持!
標(biāo)簽:玉樹 營(yíng)口 銅川 遼寧 本溪 益陽(yáng) 四川 內(nèi)江
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