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這篇文章主要講解了“怎么用ajax實現簡單搜索功能”,文中的講解內容簡單清晰,易于學習與理解,下面請大家跟著小編的思路慢慢深入,一起來研究和學習“怎么用ajax實現簡單搜索功能”吧!
本文實例講述了基于ajax的簡單搜索實現方法。分享給大家供大家參考,具體如下:
這里使用兩個.aspx文件,一個叫Default.aspx,一個叫AjaxOperations.aspx,第一個用來輸入搜索數據,后一個用來對搜索關鍵字進行處理。js文件夾下面還有一個testJs.js的文件,它就是ajax操作的核心部分。不錯,code is cheap。看代碼:
testJs.js
// 此函數等價于document.getElementById /document.all function $(s) { if (document.getElementById) { return eval('document.getElementById("' + s + '")'); } else { return eval('document.all.' + s); } } // 創建 XMLHttpRequest對象,以發送ajax請求 function createXMLHTTP() { var xmlHttp = false; var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"]; for (var i = 0; i < arrSignatures.length; i++) { try { xmlHttp = new ActiveXObject(arrSignatures[i]); return xmlHttp; } catch (oError) { xmlHttp = false; //ignore } } // throw new Error("MSXML is not installed on your system."); if (!xmlHttp && typeof XMLHttpRequest != 'undefined') { xmlHttp = new XMLHttpRequest(); } return xmlHttp; } function addAjaxSearch() { inputField = $("txtSearch"); completeTable = $("suggestTb"); completeDiv = $("popup"); completeBody = $("suggestBody"); var tempStr = inputField.value; // alert(tempStr); var keyWord = encodeURI(tempStr); if (tempStr == "") return; var xmlReq = createXMLHTTP(); xmlReq.open("post", "AjaxOperations.aspx?searchKeyword=" + keyWord, true); xmlReq.onreadystatechange = function() { if (xmlReq.readyState == 4) { if (xmlReq.status == 200) { //xmlReq.responseText為輸出的那段字符串 setNames(xmlReq.responseText); } else { alert("Connect the server failed!"); } } } xmlReq.send(null); } // 設置div中的表格數據 function setNames(names) { if (names == "") { clearNames(); return; } clearNames(); // 清空div中已有的的表格數據 setOffsets(); // 設置div到合適的位置 var row, cell, txtNode; var s = names.split("#"); for (var i = 0; i < s.length; i++) { // 顯示類似search下拉選擇項 var nextNode = s[i]; row = document.createElement("tr"); cell = document.createElement("td"); cell.onmouseout = function() { this.style.backgroundColor = ''; }; cell.onmouseover = function() { this.style.backgroundColor = '#E8F2FE'; }; cell.onclick = function() { completeField(this); }; // 搜索框設置為選擇的數據 cell.pop = "T"; txtNode = document.createTextNode(nextNode); cell.appendChild(txtNode); row.appendChild(cell); $("suggestBody").appendChild(row); } } // 清空div中已有的的表格數據 function clearNames() { completeBody = $("suggestBody"); var ind = completeBody.childNodes.length; for (var i = ind - 1; i >= 0; i--) { completeBody.removeChild(completeBody.childNodes[i]); } completeDiv = $("popup"); completeDiv.style.border = "none"; } // 設置div到合適的位置 function setOffsets() { completeTable.style.width = inputField.offsetWidth; +"px"; var left = calculateOffset(inputField, "offsetLeft"); var top = calculateOffset(inputField, "offsetTop") + inputField.offsetHeight; completeDiv.style.border = "black 1px solid"; completeDiv.style.left = left + "px"; completeDiv.style.top = top + "px"; } function calculateOffset(field, attr) { var offset = 0; while (field) { offset += field[attr]; field = field.offsetParent; } return offset; } // 搜索框設置為選擇的數據 function completeField(cell) { inputField.value = cell.firstChild.nodeValue; // 搜索框設置為選擇的數據 clearNames(); //清空div中已有的的表格數據 } //用來設置當鼠標失去焦點后文本框的隱藏 document.onmousedown = function() { if (!event.srcElement.pop) clearNames(); } //填寫輸入框
Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebTest2008.Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title>Ajax Search</title> <script src="js/testJs.js" type="text/javascript"></script> <style type="text/css" media="screen"> body { font: 11px arial; } .suggest_link { background-color: #FFFFFF; padding: 2px 0px 2px 0px; border:solid 1px #cceeff; } .suggest_link_over { background-color: #E8F2FE; padding: 2px 0px 2px 0px; } #search_suggest { position: absolute; background-color: #FFFFFF; text-align: left; border: 1px solid #000000; } </style> </head> <body> <input name="txtSearch" id="txtSearch" type="text" class="suggest_link" onkeyup="addAjaxSearch();" maxlength="200" /> <input type="submit" id="cmdSearch" name="cmdSearch" value="Search" title="Run Search" /> <div id="popup" > <table id="suggestTb" cellspacing="0" cellpadding="0" bgcolor="#fffafa" border="0"> <tbody id="suggestBody"> </tbody> </table> </div> </body> </html>
Default.aspx.cs:
using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace WebTest2008 { public partial class Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } } }
AjaxOperations.aspx:
復制代碼 代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AjaxOperations.aspx.cs" Inherits="WebTest2008.AjaxOperations" %>
AjaxOperations.aspx.cs:
using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace WebTest2008 { public partial class AjaxOperations : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!string.IsNullOrEmpty(Request["searchKeyword"])) { string tempStr = Request["searchKeyword"]; /* 測試用 實際項目中可以對數據庫進行檢索等等相關操作,這里簡化了 */ System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append(tempStr + " #"); sb.Append("#"); sb.Append(tempStr += " " + tempStr); sb.Append("#"); sb.Append(tempStr += " " + tempStr); Response.Write(sb.ToString().TrimEnd(new char[] { '#' })); } } } }
上面的代碼我都已經測試通過,復制粘貼運行試試看吧。
感謝各位的閱讀,以上就是“怎么用ajax實現簡單搜索功能”的內容了,經過本文的學習后,相信大家對怎么用ajax實現簡單搜索功能這一問題有了更深刻的體會,具體使用情況還需要大家實踐驗證。這里是億速云,小編將為大家推送更多相關知識點的文章,歡迎關注!
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