Ajax dropdown list add data
This time I bring you AjaxDrop-down listAdd data, what are the precautions for adding data to Ajax drop-down list, the following is a practical case, let's take a look.
1. In the front-end jsp, create a new drop-down control
<select id="seldvd" onChange="sel_onchange(this)"></select>
2. In the js part, create a function method, use ajax, point to the servlet part of 'getAllTypes.action', and obtain the incoming drop-down The data in the list is dynamically filled
<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 = $("#seldvd"); <span style="white-space:pre"> </span> // console.log(data); <span style="white-space:pre"> </span> for(var i = 0;i<data.length;i++){ <span style="white-space:pre"> </span> <span style="white-space:pre"> </span>$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;">数据库中用id和type保存的数据</span></span> <span style="white-space:pre"> </span> <span style="white-space:pre"> </span>$item.html(data[i].type); //添加option数据 <span style="white-space:pre"> </span> <span style="white-space:pre"> </span>$sel.append($item); //将option添加进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. Create a new servlet page to return data to Ajax
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); ArrayList<typeInfo> typeList = new ArrayList<typeInfo>(); typeDao td = new typeDao(); typeList = td.getAllTypes(); JSONArray arr = new JSONArray(typeList);//这里导入需要转json数据包 String jsString = arr.toString(); //响应到客户端 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格式数据 }
4. So the question is, where is the source of this data? Of course in the database (MySQL). So first we need to write a method to read the data in the database
<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 (need to import the JDBC package)
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 ArrayList<typeInfo> getAllTypes(){ ArrayList<typeInfo> typeList = new ArrayList<typeInfo>(); 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("显示所有类型报错:"+e.getMessage()); }finally{ super.closeAll(rs, psm, con); } return typeList; // } }
I believe you have mastered the method after reading the case in this article, please come for more exciting information Pay attention to other related articles on php Chinese website!
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