jQuery实现搜索框自动提示功能

时间:2022-04-26 05:24:28

//Default.aspx 搜索文本框输入页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_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 runat="server">
    <title></title>
    <script src="Scripts/autosuggest.js" type="text/javascript"></script>
    <link href="Styles/search.css" rel="stylesheet" type="text/css" />


    <script type="text/javascript">
        window.onload = function () {
            var oTextbox = new AutoSuggestControl(document.getElementById("txtSearchBox"), new SuggestionProvider());
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input type="text" id="txtSearchBox" odata="" class="sstxtbox" />




    </div>
    </form>
</body>
</html>


//SearchSuggest.aspx 页面提供XML数据源

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SearchSuggest.aspx.cs" Inherits="SearchSuggest" %>


<%= this.GetSuggestionXml() %>

//后台代码块

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;


public partial class SearchSuggest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }
    protected List<string> GetSearchSuggistInfo()
    {
        string valString = Request.QueryString["keyword"];
        
        if (string.IsNullOrWhiteSpace(valString))
        {
            return null;
        }
        else
        {
            valString = valString.Trim();
            valString += "%";
            List<string> strName = SortInfoManager.GetStudentNameBystrName(valString);//些方法从数据库获取数据源
            return strName;
        }
        
    }
    protected string GetSuggestionXml()
    {
        Response.ContentType = "text/xml";
        StringBuilder xmlResult = new StringBuilder("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
        List<string> nameList = GetSearchSuggistInfo();
        if (nameList != null)
        {
            xmlResult.Append("<root>");
            foreach (var str in nameList)
            {
                xmlResult.AppendFormat("<message>");
                xmlResult.AppendFormat("<text>{0}</text>", str);
                xmlResult.Append("</message>");
            }
            xmlResult.Append("</root>");
            return xmlResult.ToString();
        }
        else
        {
            return null;
        }
    }
}


//autosuggest.js 脚本



/**
* An autosuggest textbox control.
* @class
* @scope public
*/
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
                            oProvider /*:SuggestionProvider*/) {


    /**
    * The currently selected suggestions.
    * @scope private
    */
    this.cur /*:int*/ = -1;


    /**
    * The dropdown list layer.
    * @scope private
    */
    this.layer = null;


    /**
    * Suggestion provider for the autosuggest feature.
    * @scope private.
    */
    this.provider /*:SuggestionProvider*/ = oProvider;


    /**
    * The textbox to capture.
    * @scope private
    */
    this.textbox /*:HTMLInputElement*/ = oTextbox;


    /**
    * Timeout ID for fast typers.
    * @scope private
    */
    this.timeoutId /*:int*/ = null;


    /**
    * The text that the user typed.
    * @scope private
    */
    this.userText /*:String*/ = oTextbox.value;


    this.odata = oTextbox.getAttribute("odata");


    //initialize the control
    this.init();


}


/**
* Autosuggests one or more suggestions for what the user has typed.
* If no suggestions are passed in, then no autosuggest occurs.
* @scope private
* @param aSuggestions An array of suggestion strings.
* @param bTypeAhead If the control should provide a type ahead suggestion.
*/
AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
                                                     bTypeAhead /*:boolean*/) {


    //re-initialize pointer to current suggestion
    this.cur = -1;


    //make sure there's at least one suggestion
    if (!aSuggestions) {
        this.hideSuggestions();
        return;
    }
    var bSuggestions = aSuggestions.getElementsByTagName("message");
    //alert(bSuggestions.length);
    if (bSuggestions.length > 0) {
        if (bTypeAhead) {
            this.typeAhead(bSuggestions[0].getElementsByTagName("text")[0].firstChild.data);
        }


        this.showSuggestions(aSuggestions);
    } else {
        this.hideSuggestions();
    }
};


/*function goSearchInfo(data) {


    if (data) {
        var turl = "SearchInfo.aspx?keyword=" + encodeURI(data);
        window.location = turl;
    }
}*/
/**
* Creates the dropdown layer to display multiple suggestions.
* @scope private
*/
AutoSuggestControl.prototype.createDropDown = function () {




    //create the layer and assign styles
    this.layer = document.createElement("div");
    this.layer.className = "suggestions_F";
    this.layer.style.visibility = "hidden";
    this.layer.style.width = this.textbox.offsetWidth;
    document.body.appendChild(this.layer);


    //when the user clicks on the a suggestion, get the text (innerHTML)
    //and place it into a textbox
    var oThis = this;
    this.layer.onmousedown =
    this.layer.onmouseup =
    this.layer.onmouseover = function (oEvent) {
        oEvent = oEvent || window.event;
        oTarget = oEvent.target || oEvent.srcElement;


        if (oEvent.type == "mousedown") {
            oThis.textbox.value = oTarget.firstChild.nodeValue;
            oThis.hideSuggestions();
            goSearchInfo(oTarget.firstChild.nodeValue);
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
        } else {
            oThis.textbox.focus();
        }
    };


};


/**
* Gets the left coordinate of the textbox.
* @scope private
* @return The left coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getLeft = function () /*:int*/{


    var oNode = this.textbox;
    var iLeft = 0;


    while (oNode != document.body) {
        iLeft += oNode.offsetLeft;
        oNode = oNode.offsetParent;
    }


    return iLeft;
};


/**
* Gets the top coordinate of the textbox.
* @scope private
* @return The top coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getTop = function () /*:int*/{


    var oNode = this.textbox;
    var iTop = 0;


    while (oNode != document.body) {
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }


    return iTop + 15;
};


/**
* Highlights the next or previous suggestion in the dropdown and
* places the suggestion into the textbox.
* @param iDiff Either a positive or negative number indicating whether
*              to select the next or previous sugggestion, respectively.
* @scope private
*/
AutoSuggestControl.prototype.goToSuggestion = function (iDiff /*:int*/) {
    var cSuggestionNodes = this.layer.childNodes;


    if (cSuggestionNodes.length > 0) {
        var oNode = null;


        if (iDiff > 0) {
            if (this.cur < cSuggestionNodes.length - 1) {
                oNode = cSuggestionNodes[++this.cur];
            }
        } else {
            if (this.cur > 0) {
                oNode = cSuggestionNodes[--this.cur];
            }
        }


        if (oNode) {
            this.highlightSuggestion(oNode);
            this.textbox.value = oNode.firstChild.nodeValue;
        }
    }
};


/**
* Handles three keydown events.
* @scope private
* @param oEvent The event object for the keydown event.
*/
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {


    switch (oEvent.keyCode) {
        case 38: //up arrow
            this.goToSuggestion(-1);
            break;
        case 40: //down arrow 
            this.goToSuggestion(1);
            break;
        case 27: //esc
            this.textbox.value = this.userText;
            this.selectRange(this.userText.length, 0);
            /* falls through */
        case 13: //enter
            this.hideSuggestions();
            oEvent.returnValue = false;
            if (oEvent.preventDefault) {
                oEvent.preventDefault();
            }
            break;
    }


};


/**
* Handles keyup events.
* @scope private
* @param oEvent The event object for the keyup event.
*/
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {


    var iKeyCode = oEvent.keyCode;
    var oThis = this;


    //get the currently entered text




    //for backspace (8) and delete (46), shows suggestions without typeahead




    if (iKeyCode == 13) {
        if (this.textbox.value) {
            if (this.userText == this.textbox.value) {
               // goSearchInfo(this.userText);
            }
        }


        //var cControl = document.getElementById("txtSearchBox");
        this.userText = this.textbox.value;
    }
    else {
        this.userText = this.textbox.value;


        clearTimeout(this.timeoutId);


        if (iKeyCode == 8 || iKeyCode == 46) {


            this.timeoutId = setTimeout(function () {
                oThis.provider.requestSuggestions(oThis, false);
            }, 250);


            //make sure not to interfere with non-character keys
        }
        else if ((iKeyCode != 16 && iKeyCode < 32) || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
            //ignore
        } else {
            //request suggestions from the suggestion provider with typeahead
            if (!oThis.userText) {
                //oThis.odata = String.fromCharCode(iKeyCode);
                //oThis.textbox.setAttribute("odata", this.odata);
                oThis.userText = String.fromCharCode(iKeyCode);
                //alert(oThis.userText);
                //oThis.setAttribute("aa", "aa");
            }
            this.timeoutId = setTimeout(function () {
                oThis.provider.requestSuggestions(oThis, false);
            }, 250);
        }
    }
};


/**
* Hides the suggestion dropdown.
* @scope private
*/
AutoSuggestControl.prototype.hideSuggestions = function () {
    this.layer.style.visibility = "hidden";
};


/**
* Highlights the given node in the suggestions dropdown.
* @scope private
* @param oSuggestionNode The node representing a suggestion in the dropdown.
*/
AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {


    for (var i = 0; i < this.layer.childNodes.length; i++) {
        var oNode = this.layer.childNodes[i];
        if (oNode == oSuggestionNode) {
            oNode.className = "current"
        } else if (oNode.className == "current") {
            oNode.className = "";
        }
    }
};


/**
* Initializes the textbox with event handlers for
* auto suggest functionality.
* @scope private
*/
AutoSuggestControl.prototype.init = function () {


    //save a reference to this object
    var oThis = this;


    //assign the onkeyup event handler
    this.textbox.onkeyup = function (oEvent) {


        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }


        //call the handleKeyUp() method with the event object
        oThis.handleKeyUp(oEvent);
    };


    //assign onkeydown event handler
    this.textbox.onkeydown = function (oEvent) {


        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }


        //call the handleKeyDown() method with the event object
        oThis.handleKeyDown(oEvent);
    };


    //assign onblur event handler (hides suggestions)    
    this.textbox.onblur = function () {
        oThis.hideSuggestions();
    };


    //create the suggestions dropdown
    this.createDropDown();
};


/**
* Selects a range of text in the textbox.
* @scope public
* @param iStart The start index (base 0) of the selection.
* @param iEnd The end index of the selection.
*/
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iEnd /*:int*/) {


    //use text ranges for Internet Explorer
    if (this.textbox.createTextRange) {
        var oRange = this.textbox.createTextRange();
        oRange.moveStart("character", iStart);
        oRange.moveEnd("character", iEnd - this.textbox.value.length);
        oRange.select();


        //use setSelectionRange() for Mozilla
    } else if (this.textbox.setSelectionRange) {
        this.textbox.setSelectionRange(iStart, iEnd);
    }


    //set focus back to the textbox
    this.textbox.focus();
};


/**
* Builds the suggestion layer contents, moves it into position,
* and displays the layer.
* @scope private
* @param aSuggestions An array of suggestions for the control.()//////////////////////////////////////////////////////////////这里要改
*/
AutoSuggestControl.prototype.showSuggestions = function (bSuggestions /*:Array*/) {


    var oDiv = null;
    var aSuggestions = bSuggestions.getElementsByTagName("message");
    this.layer.innerHTML = "";  //clear contents of the layer
    //aSuggestions.length设置显示长度
    for (var i = 0; i < 5; i++) {
        oDiv = document.createElement("div");
        oDiv.appendChild(document.createTextNode(aSuggestions[i].getElementsByTagName("text")[0].firstChild.data));
        this.layer.appendChild(oDiv);
    }


    this.layer.style.left = (this.getLeft() - 0) + "px";
    this.layer.style.top = (this.getTop() + this.textbox.offsetHeight - 11) + "px";
    this.layer.style.visibility = "visible";
    this.layer.style.width = "285px";
    //    this.layer.style.position = "absolute";
    //    this.layer.style.zIndex = "1989";
    //    this.layer.style.backgroundColor = "white";
    //    this.layer.style.lineHeight = "30px";
    //    this.layer.style.paddingTop = "10px";
};


/**
* Inserts a suggestion into the textbox, highlighting the 
* suggested part of the text.
* @scope private
* @param sSuggestion The suggestion for the textbox.
*/
AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {


    //check for support of typeahead functionality


    if (this.textbox.createTextRange || this.textbox.setSelectionRange) {
        var iLen = this.textbox.value.length;
        this.textbox.value = sSuggestion;
        this.selectRange(iLen, sSuggestion.length);
    }
};


//创建链接数据库
function createXMLHttp() {


    if (typeof XMLHttpRequest != "undefined") {
        return new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
        var aVersions = ["MSXML2.XMLHttp.5.0",
        "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0",
        "MSXML2.XMLHttp", "Microsoft.XMLHttp"
      ];
        for (var i = 0; i < aVersions.length; i++) {
            try {
                var oXmlHttp = new ActiveXObject(aVersions[i]);
                return oXmlHttp;
            }
            catch (oError) {
                //Do nothing
            }
        }
    }
    throw new Error("XMLHttp object could be created.");
}
/**
* Provides suggestions for state/province names.
* @class
* @scope public
*/


function SuggestionProvider() {
    this.xhr = new createXMLHttp();
}


/**
* Request suggestions for the given autosuggest control. 
* @scope protected
* @param oAutoSuggestControl The autosuggest control to provide suggestions for.
*/
SuggestionProvider.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/,
                                                            bTypeAhead /*:boolean*/) {


    var oXHR = this.xhr;


    //cancel any active requests                          
    if (oXHR.readyState != 0) {
        oXHR.abort();
    }


    //define the data
    //var oData = { 
    //    requesting: "StatesAndProvinces", 
    //    text: oAutoSuggestControl.userText,
    //    limit: 9 
    //};
    var searchV = oAutoSuggestControl.userText;
    if (searchV) {
        var urlss = "SearchSuggest.aspx?keyword=" + encodeURI(searchV) + "&limit=5" + "&t=" + new Date().getTime();
        //open connection to server
        oXHR.open("get", urlss, true);
        oXHR.onreadystatechange = function () {
            if (oXHR.readyState == 4) {
                //evaluate the returned text JavaScript (an array)
                var aSuggestions = oXHR.responseXML;
                //provide suggestions to the control
                oAutoSuggestControl.autosuggest(aSuggestions, bTypeAhead);
            }
        }
        oXHR.send(null);
    };


    //send the request
};


//search.css 样式

.sstxtbox {
width: 285px;
height: 20px;
line-height: 20px;
padding: 3px 0;
border: 1px solid;


}
div.suggestions_F {
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    background-color: white;
    border: 1px solid #AAAAAA;
    border-top:0px;
    width:285px;
    overflow:hidden;
    position: absolute;   
    z-index:1989;
    line-height:30px;
}


div.suggestions_F div {
    cursor: default;
    padding: 0px 3px;
    white-space:nowrap;
}


div.suggestions_F div.current {
    background-color: #3366cc;
    color: white;
}
.sstxtbox:focus { outline:none; }
.fudong {
display: block;
position: fixed;
_position: absolute;
z-index: 99999;
bottom: 0px;
right: 0px;
}


相关文章