jQuery自动补全autocomplete插件使用,三种获取数据源方式具体实现(true)

宰子琪
2023-12-01

jQuery有很多很多的已经实现,很漂亮的插件,autocomplete就是其中之一。jQuery ui autocomplete主要支持字符串Array、JSON两种数据格式。

主要参数:

Source:数据源,类型为String、Array、Function,其中String为ajax请求的服务器端地址,返回Array/JSON格式,Array即为数组,静态定义到页面中的数据,下面会有具体的 

            demo,Function(request,response):通过request.term获得输入的值,response(Array)来呈现数据(JSONP是这种方式);

minLength:当输入框内字符串长度达到minLength时,激活Autocomplete

autoFocus:当autocomplete选择菜单弹出时,自动选中第一个。

delay:即延迟多少毫秒autocomplete

disabled:是否禁用自动完成功能,默认false

jQuery ui提供的常用方法:

close():关闭智能提示框

destory():销毁智能提示框,将其所产生的元素完全删除,使其恢复至初始状态

disable():禁用自动完成功能

enable():开启自动完成功能

主要事件:

change(event,ul):当值改变时发生,ui.item为选中项

close(event,ui):当智能提示框关闭时发生

create(event,ui):当智能提示框创建时发生,可以在此事件中,对外观进行控制

focus(event,ui):当智能提示列表任意一项获得焦点时发生,ui.item为获得焦点的项

open(event,ui):当智能提示框打开或更新时发生

response(event,ui):在搜索完成之后智能提示框显示前发生,可以在此时间中对显示项进行处理

search(event,ui):在开始请求之前发生,可以在此事件中返回false来取消请求

select(event,ui):当智能提示框中任意一项被选中时发生,ui.item为选中项


使用时应首先需要导入相关的js文件

下载:http://jqueryui.com/autocomplete/   jquery ui相关js ,下载后的文件external文件夹下有jquery的核心js

第一种获取数据源方式:String,即通过字符串发送ajax,本例为了省事,直接就使用了原始的servlet,没有用到框架,只是演示效果

数据库(略)

dao

package com.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

public class Dao {

	private static Connection getConnection() throws Exception{
		Class.forName("com.mysql.jdbc.Driver");
		return DriverManager.getConnection("jdbc:mysql://localhost:3306/itac", "root", "root");
	}
	
	public static List<String> getNames(String username) throws Exception{
		Connection c = getConnection();
		Statement stat = c.createStatement();
		ResultSet rs = stat.executeQuery("select user_name from t_user where user_name like '%"+username+"%'");
		List<String> strs = new ArrayList<String>();
		while(rs.next()){
			strs.add(rs.getString("user_name"));
		}
		return strs;
	}
}

servlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.Dao;
@WebServlet(name="autoServlet",value="/auto")
public class AutoServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
   
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");//解决乱码
		String username = request.getParameter("term");//默认传过来的参数名成为term,封装了文本框中输入的值
		StringBuffer sb = new StringBuffer("[");
		try {
			List<String> names = Dao.getNames(username);
			for(int i=0;i<names.size();i++){
				if(i==names.size()-1){
					//注意在拼接的时候,要用双引号,单引号我试过,不起作用好像是,至少key必须是双引号,最好都写成双引号
					/*
					 * 其中label属性用于显示在autocomplete弹出菜单,而value属性则是选中后给文本框赋的值。如果没有指定其中一个属性
					 * 则用另一个属性替代(即value和label值一样),如果label和value都没有指定,则无法用于autocomplete的提示。	
					 */
					sb.append("{\"lable\":\""+names.get(i)+"\",\"value\":\""+names.get(i)+"\"}]");
				}else{
					sb.append("{\"lable\":\""+names.get(i)+"\",\"value\":\""+names.get(i)+"\"},");
				}
			}
			System.out.println(sb.toString());
			response.getWriter().write(sb.toString());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}
页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<link href="${pageContext.request.contextPath }/resources/css/jquery-ui.css" rel="stylesheet">
	<style>
	body{
		font: 62.5% "Trebuchet MS", sans-serif;
		margin: 50px;
	}
	</style>
<script src="${pageContext.request.contextPath }/resources/js/jquery.js"></script>
<script src="${pageContext.request.contextPath }/resources/js/jquery-ui.js"></script>
<%-- <script src="${pageContext.request.contextPath }/resources/js/jquery.ui.core.js"></script>
<script src="${pageContext.request.contextPath }/resources/js/jquery.ui.autocomplete.js"></script>
<script src="${pageContext.request.contextPath }/resources/js/jquery.ui.position.js"></script>
<script src="${pageContext.request.contextPath }/resources/js/jquery.ui.widget.js"></script> --%>
</head>
<body>
	<input id="username" type="text" value="" name="username"/>
</body>  
<script type="text/javascript">
//String方式
$(function(){
	$("#username").autocomplete({
		source:"<c:url value="/auto"/>",
		minLength:1		
	});
});

</script>
</html>

第二种获取数据源方式:回调函数

dao

package com.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import domain.User;

public class Dao2 {
	private static Connection getConnection() throws Exception{
		Class.forName("com.mysql.jdbc.Driver");
		return DriverManager.getConnection("jdbc:mysql://localhost:3306/itac", "root", "root");
	}
	
	public static List<User> getNames(String username) throws Exception{
		Connection c = getConnection();
		Statement stat = c.createStatement();
		ResultSet rs = stat.executeQuery("select * from t_user where user_name like '%"+username+"%'");
		List<User> users = new ArrayList<User>();
		while(rs.next()){
			User u = new User();
			u.setUserId(Integer.parseInt(rs.getString("user_id")));
			u.setUserName(rs.getString("user_name"));
			u.setBirth(rs.getString("user_date"));
			users.add(u);
		}
		return users;
	}
}
User.java

package domain;

public class User {

	private Integer userId;
	private String userName;
	private String birth;
	
	//getter setter tostring
	
}

servlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.Dao2;
import com.google.gson.Gson;

import domain.User;

/**
 * Servlet implementation class AutoServlet2
 */
@WebServlet("/auto2")
public class AutoServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
   
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		System.out.println(request.getParameter("userName"));
		try {
			List<User> users = Dao2.getNames(request.getParameter("userName"));
			Gson gson = new Gson();
			String str = gson.toJson(users);
			response.getWriter().write(str);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<link href="${pageContext.request.contextPath }/resources/css/jquery-ui.css" rel="stylesheet">
	<style>
	body{
		font: 62.5% "Trebuchet MS", sans-serif;
		margin: 50px;
	}
	</style>
<script src="${pageContext.request.contextPath }/resources/js/jquery.js"></script>
<script src="${pageContext.request.contextPath }/resources/js/jquery-ui.js"></script>
</head>
<body>
<input type="text" name="userName" id="userName"/>
</body>
<script type="text/javascript">
$("#userName").autocomplete({
source: function( request, response ) {
    $.ajax({
    	type:"post",
        url: "<c:url value="/auto2"/>",
        dataType: "json",
        data:{
            userName: request.term
        },
        success: function( data ) {
            response( $.map( data, function( item ) {
                return {   //lable为下拉列表显示数据源。value为选中放入到文本框的值,这种方式可以自定义显示
                	lable:item.userName,    
                    value: item.userName
                }
            }));
        }
    });
},
minLength: 1,
select: function( event, ui ) { //移动键盘上下键,自动将下拉列表的数据放入到文本框,不过不写这个配置也是可以的,默认就行,具体这个还不知道是做什么
    $("#userName").val(ui.item.userName);
}
});
</script>
</html>
第三种方式较简单,直接在页面上放入,比如:

// 本地json数组
var availableTagsJSON = [
{ label: "C# Language", value: "C#" },
{ label: "C++ Language", value: "C++" },
{ label: "Java Language", value: "Java" },
{ label: "JavaScript Language", value: "JavaScript" },
{ label: "ASP.NET", value: "ASP.NET" },
{ label: "JSP", value: "JSP" },
{ label: "PHP", value: "PHP" },
{ label: "Python", value: "Python" },
{ label: "Ruby", value: "Ruby" }
];
$("#local").autocomplete({
source: availableTagsJSON
});





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