zoukankan      html  css  js  c++  java
  • ASP.NET(C#)中的自动下拉框的实现

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html>
    <head>
    <title>Ajax实现自动提示的文本框</title>
    <style>
    <!--
    body{
        font-family:Arial, Helvetica, sans-serif;
        font-size:12px; padding:0px; margin:5px;
    }
    form{padding:0px; margin:0px;}
    input{
        /* 用户输入框的样式 */
        font-family:Arial, Helvetica, sans-serif;
        font-size:12px; border:1px solid #000000;
        200px; padding:1px; margin:0px;
    }
    #popup{
        /* 提示框div块的样式 */
        position:absolute; 202px;
        color:#004a7e; font-size:12px;
        font-family:Arial, Helvetica, sans-serif;
        left:41px; top:25px;
    }
    #popup.show{
        /* 显示提示框的边框 */    
        border:1px solid #004a7e;
    }
    #popup.hide{
        /* 隐藏提示框的边框 */
        border:none;
    }
    /* 提示框的样式风格 */
    ul{
        list-style:none;
        margin:0px; padding:0px;
    }
    li.mouseOver{
        background-color:#004a7e;
        color:#FFFFFF;
    }
    li.mouseOut{
        background-color:#FFFFFF;
        color:#004a7e;
    }
    -->
    </style>
    <script language="javascript">
    var oInputField;    //考虑到很多函数中都要使用
    var oPopDiv;        //因此采用全局变量的形式
    var oColorsUl;
    var xmlHttp;
    function createXMLHttpRequest(){
        if(window.ActiveXObject)
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        else if(window.XMLHttpRequest)
            xmlHttp = new XMLHttpRequest();
    }
    function initVars(){
        //初始化变量
        oInputField = document.forms["myForm1"].colors;
        oPopDiv = document.getElementById("popup");
        oColorsUl = document.getElementById("colors_ul");
    }
    function clearColors(){
        //清除提示内容
        for(var i=oColorsUl.childNodes.length-1;i>=0;i--)
            oColorsUl.removeChild(oColorsUl.childNodes[i]);
        oPopDiv.className = "hide";
    }
    function setColors(the_colors){
        //显示提示框,传入的参数即为匹配出来的结果组成的数组
        clearColors();    //每输入一个字母就先清除原先的提示,再继续
        oPopDiv.className = "show";
        var oLi;
        for(var i=0;i<the_colors.length;i++){
            //将匹配的提示结果逐一显示给用户
            oLi = document.createElement("li");
            oColorsUl.appendChild(oLi);
            oLi.appendChild(document.createTextNode(the_colors[i]));
      
            oLi.onmouseover = function(){
                this.className = "mouseOver";    //鼠标经过时高亮
            }
            oLi.onmouseout = function(){
                this.className = "mouseOut";    //离开时恢复原样
            }
            oLi.onclick = function(){
                //用户点击某个匹配项时,设置输入框为该项的值
                oInputField.value = this.firstChild.nodeValue;
                clearColors();    //同时清除提示框
            }
        }
    }
    function findColors(){
        initVars();        //初始化变量
        if(oInputField.value.length > 0){
            createXMLHttpRequest();        //将用户输入发送给服务器
            var sUrl = "9-10.aspx?sColor=" + oInputField.value + "&timestamp=" + new Date().getTime();
            xmlHttp.open("GET",sUrl,true);
            xmlHttp.onreadystatechange = function(){
                if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
                    var aResult = new Array();
                    if(xmlHttp.responseText.length){
                        aResult = xmlHttp.responseText.split(",");
                        setColors(aResult);    //显示服务器结果
                    }
                    else
                        clearColors();
                }
            }
            xmlHttp.send(null);
        }        
        else
            clearColors();    //无输入时清除提示框(例如用户按del键)
    }
    </script>
    </head>
    <body>
    <form method="post" name="myForm1">
    Color: <input type="text" name="colors" id="colors" onkeyup="findColors();" />
    </form>
    <div id="popup">
        <ul id="colors_ul"></ul>
    </div>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/hjtdlx/p/2248488.html
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