标签:
1.前台代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="InputAutoCompelete.aspx.cs" Inherits="HraWeb.InputAutoCompelete" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>搜索词自动完成</title>
<style type="text/css">
#search {
text-align: center;
position: relative;
}
.autocomplete {
border: 1px solid #9ACCFB;
background-color: white;
text-align: left;
}
.autocomplete li {
list-style-type: none;
}
.clickable {
cursor: default;
}
.highlight {
background-color: #9ACCFB;
}
</style>
<%--<script type="text/javascript" src="Scripts/jquery.js"></script>--%>
<script type="text/javascript">
$(function () {
//取得div层
var $search = $(‘#search‘);
//取得输入框JQuery对象
var $searchInput = $search.find(‘#search-text‘);
//关闭浏览器提供给输入框的自动完成
$searchInput.attr(‘autocomplete‘, ‘off‘);
//创建自动完成的下拉列表,用于显示服务器返回的数据,插入在搜索按钮的后面,等显示的时候再调整位置
var $autocomplete = $(‘<div></div>‘)
.hide()
.insertAfter(‘#submit‘);
//清空下拉列表的内容并且隐藏下拉列表区
var clear = function () {
$autocomplete.empty().hide();
};
//注册事件,当输入框失去焦点的时候清空下拉列表并隐藏
$searchInput.blur(function () {
setTimeout(clear, 500);
});
//下拉列表中高亮的项目的索引,当显示下拉列表项的时候,移动鼠标或者键盘的上下键就会移动高亮的项目,想百度搜索那样
var selectedItem = null;
//timeout的ID
var timeoutid = null;
//设置下拉项的高亮背景
var setSelectedItem = function (item) {
//更新索引变量
selectedItem = item;
//按上下键是循环显示的,小于0就置成最大的值,大于最大值就置成0
if (selectedItem < 0) {
selectedItem = $autocomplete.find(‘li‘).length - 1;
}
else if (selectedItem > $autocomplete.find(‘li‘).length - 1) {
selectedItem = 0;
}
//首先移除其他列表项的高亮背景,然后再高亮当前索引的背景
$autocomplete.find(‘li‘).removeClass(‘highlight‘)
.eq(selectedItem).addClass(‘highlight‘);
};
var ajax_request = function () {
//ajax服务端通信
$.ajax({
‘url‘: ‘InputAutoCompelete.aspx‘, //服务器的地址
‘data‘: { ‘search-text‘: $searchInput.val() }, //参数
‘dataType‘: ‘json‘, //返回数据类型
‘type‘: ‘POST‘, //请求类型
‘success‘: function (data) {
if (data.length) {
//遍历data,添加到自动完成区
$.each(data, function (index, term) {
//创建li标签,添加到下拉列表中
$(‘<li></li>‘).text(term).appendTo($autocomplete)
.addClass(‘clickable‘)
.hover(function () {
//下拉列表每一项的事件,鼠标移进去的操作
$(this).siblings().removeClass(‘highlight‘);
$(this).addClass(‘highlight‘);
selectedItem = index;
}, function () {
//下拉列表每一项的事件,鼠标离开的操作
$(this).removeClass(‘highlight‘);
//当鼠标离开时索引置-1,当作标记
selectedItem = -1;
})
.click(function () {
//鼠标单击下拉列表的这一项的话,就将这一项的值添加到输入框中
$searchInput.val(term);
//清空并隐藏下拉列表
$autocomplete.empty().hide();
});
});//事件注册完毕
//设置下拉列表的位置,然后显示下拉列表
var ypos = $searchInput.position().top;
var xpos = $searchInput.position().left;
$autocomplete.css(‘width‘, $searchInput.css(‘width‘));
$autocomplete.css({ ‘position‘: ‘relative‘, ‘left‘: xpos + "px", ‘top‘: ypos + "px" });
setSelectedItem(0);
//显示下拉列表
$autocomplete.show();
}
}
});
};
//对输入框进行事件注册
$searchInput
.keyup(function (event) {
//字母数字,退格,空格
if (event.keyCode > 40 || event.keyCode == 8 || event.keyCode == 32) {
//首先删除下拉列表中的信息
$autocomplete.empty().hide();
clearTimeout(timeoutid);
timeoutid = setTimeout(ajax_request, 100);
}
else if (event.keyCode == 38) {
//上
//selectedItem = -1 代表鼠标离开
if (selectedItem == -1) {
setSelectedItem($autocomplete.find(‘li‘).length - 1);
}
else {
//索引减1
setSelectedItem(selectedItem - 1);
}
event.preventDefault();
}
else if (event.keyCode == 40) {
//下
//selectedItem = -1 代表鼠标离开
if (selectedItem == -1) {
setSelectedItem(0);
}
else {
//索引加1
setSelectedItem(selectedItem + 1);
}
event.preventDefault();
}
})
.keypress(function (event) {
//enter键
if (event.keyCode == 13) {
//列表为空或者鼠标离开导致当前没有索引值
if ($autocomplete.find(‘li‘).length == 0 || selectedItem == -1) {
return;
}
$searchInput.val($autocomplete.find(‘li‘).eq(selectedItem).text());
$autocomplete.empty().hide();
event.preventDefault();
}
})
.keydown(function (event) {
//esc键
if (event.keyCode == 27) {
$autocomplete.empty().hide();
event.preventDefault();
}
});
//注册窗口大小改变的事件,重新调整下拉列表的位置
$(window).resize(function () {
var ypos = $searchInput.position().top;
var xpos = $searchInput.position().left;
$autocomplete.css(‘width‘, $searchInput.css(‘width‘));
$autocomplete.css({ ‘position‘: ‘relative‘, ‘left‘: xpos + "px", ‘top‘: ypos + "px" });
});
});
</script>
</head>
<body>
<div id="search">
<label for="search-text">请输入关键词</label><input type="text" id="search-text" name="search-text" />
<input type="button" id="submit" value="搜索" />
</div>
</body>
</html>
2.后台代码
using HraWeb.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace HraWeb
{
public partial class InputAutoCompelete : BasePage
{
protected void Page_Load(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(Request["search-text"]))
{
string[] words = {"amani","abc","apple","abstract","an","bike","byebye",
"beat","be","bing","come","cup","class","calendar","china"};
string key = Request["search-text"];
if (key.Length != 0)
{
List<string> jsonList = new List<string>();
for (int i = 0; i < words.Length; i++)
{
if (words[i].Contains(key))
{
jsonList.Add(words[i]);
}
}
var json=Newtonsoft.Json.JsonConvert.SerializeObject(jsonList);
HttpContext.Current.Response.Write(json);
HttpContext.Current.Response.End();
}
}
}
}
}
标签:
原文地址:http://www.cnblogs.com/kexb/p/5064983.html