文本框输入内容实现智能提示效果代码实例
分类：实例代码
本章节分享一段代码实例，它实现了文本框输入内容能够实现智能提示效果。
在谷歌和百度这样的搜索引擎都是先了这样的功能，大家输入关键词的时候，下面会出现一些相关的推荐，非常的人性化，下面就是一段代码，需要的朋友可以做一下参考，代码如下:
前端代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.51texiao.cn/" />
<title>前端教程网</title>
<style type="text/css" media="screen">
body
{
font: 11px arial;
}
.suggest_link
{
width:120px;
background-color: #FFFFFF;
padding: 2px 6px 2px 6px;
}
.suggest_link_over
{
width:120px;
background-color: #E8F2FE;
padding: 2px 6px 2px 6px;
}
#suggestResult
{
position: absolute;
background-color: #FFFFFF;
text-align: left;
border: 1px solid #000000;
}
/*input*/
.input_on
{
padding: 2px 8px 0pt 3px;
height: 18px;
border: 1px solid #999;
background-color: #FFFFCC;
}
.input_off
{
padding: 2px 8px 0pt 3px;
height: 18px;
border: 1px solid #CCC;
background-color: #FFF;
}
.input_move
{
padding: 2px 8px 0pt 3px;
height: 18px;
border: 1px solid #999;
background-color: #FFFFCC;
}
.input_out
{
/*height:16px;默认高度*/
padding: 2px 8px 0pt 3px;
height: 18px;
border: 1px solid #CCC;
background-color: #FFF;
}
</style>
<script language="javascript" type="text/javascript">
var $ = document.getElementById;
//创建XMLHttpRequest对象
function createXMLHttpRequest() {
var obj;
if (window.XMLHttpRequest) { //Mozilla 浏览器
obj = new XMLHttpRequest();
}
else if (window.ActiveXObject) { // IE浏览器
try {
obj = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
obj = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) { }
}
}
return obj;
}
//当输入框的内容变化时，调用该函数
function searchSuggest() {
var inputField = $("txtSearch");
var suggestText = $("suggestResult");
if (inputField.value.length > 0) {
var o = createXMLHttpRequest();
var url = "SearchResult.ashx?searchText=" + escape(inputField.value);
o.open("GET", url, true);
o.onreadystatechange = function () {
if (o.readyState == 4) {
if (o.status == 200) {
var sourceItems = o.responseText.split("\n");
if (sourceItems.length > 1) {
suggestText.style.display = "";
suggestText.innerHTML = "";
for (var i = 0; i < sourceItems.length - 1; i++) {
var sourceText = sourceItems[i].split("@")[1];
var sourceValue = sourceItems[i].split("@")[0];
var s = "<div onmouseover=\"javascript:suggestOver(this);\" ";
s += " onmouseout=\"javascript:suggestOut(this);\" ";
s += " onclick=\"javascript:setSearch('" + sourceText + "','" + sourceValue + "');\" ";
s += " class=\"suggest_link\" >" + sourceText + "</div>";
suggestText.innerHTML += s;
}
}
else {
suggestText.style.display = "none";
}
}
}
}; //指定响应函数
o.send(null); // 发送请求
}
else {
suggestText.style.display = "none";
}
}
function delayExecute() {
$("valueResult").value = "";
window.setTimeout(function () { searchSuggest() }, 800);
//延时处理
}
function suggestOver(div_value) {
div_value.className = "suggest_link_over";
}
function suggestOut(div_value) {
div_value.className = "suggest_link";
}
function setSearch(a, b) {
$("txtSearch").value = a;
$("valueResult").value = b;
var div = $("suggestResult");
div.innerHTML = "";
div.style.display = "none";
}
function showResult() {
alert($("txtSearch").value + $("valueResult").value);
}
</script>
</head>
<body>
<form id="form1" action="">
<input type="text" id="txtSearch" name="txtSearch" onkeyup="delayExecute();" size="20"
class="input_out" onfocus="this.className='input_on';this.onmouseout=''"
onblur="this.className='input_off';this.onmouseout=function(){this.className='input_out'};"
onmousemove="this.className='input_move'" onmouseout="this.className='input_out'" />
<input type="hidden" id="valueResult" name="valueResult" value="" />
<br />
<div id="suggestResult" style="display: none"></div>
<br/>
<input id="button1" type="button" value="提交" onclick="showResult();" />
</form>
</body>
</html>
服务器端代码，c#编写:
<%@ WebHandler Language="C#" Class="SearchResult" %>
using System;
using System.Web;
using System.Data;
public class SearchResult : IHttpHandler {
public void ProcessRequest (HttpContext context) {
object QueryWord=context.Request.QueryString["searchText"];
if (QueryWord != null)
{
if (QueryWord.ToString().Trim().Length > 0)
{
DataTable dt = getDB();
string returnText = "";
if (dt != null && dt.Rows.Count > 0)
{
DataRow[] dr = dt.Select(" name like '%" + QueryWord .ToString()+ "%' ");
if (dr.Length > 0)
{
for (int i = 0; i < dr.Length; i++)
{
//可设置返回多字符串
returnText += dr[i]["id"].ToString() + "@" + dr[i]["name"].ToString() + "\n";
}
}
}
context.Response.Write(returnText);
context.Response.End();
}
}
}
public bool IsReusable {
get {
return false;
}
}
/// <summary>
/// 获取数据源的方法
/// </summary>
/// <returns>数据源</returns>
private DataTable getDB()
{
DataTable dt = new DataTable();
dt.Columns.Add("id");
dt.Columns.Add("name");
dt.Columns.Add("age");
dt.Rows.Add(new object[] { "000001", "张三", "26" });
dt.Rows.Add(new object[] { "000002", "张晓", "26" });
dt.Rows.Add(new object[] { "000003", "张岚", "27" });
dt.Rows.Add(new object[] { "000004", "李四", "25" });
dt.Rows.Add(new object[] { "000005", "李星", "27" });
return dt;
}
}