方法一：
<html> <head> <meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>可编辑下拉框</title> <script language="javascript"> function editable(select1){ if(select1.value == ""){ var newvalue = prompt("请输入",""); if(newvalue){ addSelected(select1,newvalue,newvalue); } } } function addSelected(fld1,value1,text1){ if (document.all) { var Opt = fld1.document.createElement("OPTION"); Opt.text = text1; Opt.value = value1; fld1.options.add(Opt); Opt.selected = true; }else{ var Opt = new Option(text1,value1,false,false); Opt.selected = true; fld1.options[fld1.options.length] = Opt; } } </script> </head> <body> <select name="markcode" onChange="editable(this);"> <option value="value1">选项一</option> <option value="">请输入</option> </select> </body> </html>
方法二：
<html> <head> <meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>可编辑下拉框</title> <style> a{color:blue;text-decoration:none} a:hover{color:red} </style> </head> <body> <table style="border:2px outset;background-color:#d2e8FF" width="250" height="100" align="center"> <tr> <td width="100%" align="center" colspan="2"><b>可编辑下拉框</b></td> </tr> <tr> <td width="60%" height="30" align="center"> <select name="fason"> <option value="可编辑下拉框">可编辑下拉框</option> <option value="作者:阿信">阿信</option> </select> </td> <td width="40%" height="30" align="left"> <input type=button value=" 取值 " onclick="alert(document.getElementsByName('combox_fason')[0].value)"> </td> </tr> </table> <script language="javascript"> /* 作者：fason(阿信) 日期：2003-7-1 版本：v1.0 备注：只作技术交流，如需转载请注明作者等有关信息，多谢合作 */ function combox(obj,select){ this.obj=obj this.name=select; this.select=document.getElementsByName(select)[0]; /*要转换的下拉框*/ } /*初始化对象*/ combox.prototype.init=function(){ var inputbox="<input name='combox_"+this.name+"' onchange='"+this.obj+".find()' " inputbox+="style='position:absolute;"+(this.select.offsetWidth-16)+";height:"+this.select.offsetHeight+";left:"+getL(this.select)+";top:"+getT(this.select)+"'>" document.write(inputbox) with(this.select.style){ left=getL(this.select) top=getT(this.select) position="absolute" clip="rect(0 "+(this.select.offsetWidth)+" "+this.select.offsetHeight+" "+(this.select.offsetWidth-18)+")" /*切割下拉框*/ } this.select.onchange=new Function(this.obj+".change()") this.change() } /*初始化结束*/ ////////对象事件定义/////// combox.prototype.find=function(){ /*当搜索到输入框的值时,下拉框自动定位*/ var inputbox=document.getElementsByName("combox_"+this.name)[0] with(this.select){ for(i=0;i<options.length;i++) if(options[i].text.indexOf(inputbox.value)==0){ selectedIndex=i this.change(); break; } } } combox.prototype.change=function(){ /*定义下拉框的onchange事件*/ var inputbox=document.getElementsByName("combox_"+this.name)[0] inputbox.value=this.select.options[this.select.selectedIndex].text; with(inputbox){select();focus()}; } ////////对象事件结束/////// /*公用定位函数(获取控件绝对坐标)*/ function getL(e){ var l=e.offsetLeft; while(e=e.offsetParent)l+=e.offsetLeft; return l } function getT(e){ var t=e.offsetTop; while(e=e.offsetParent)t+=e.offsetTop; return t } /*结束*/ </script> <script language="javascript"> var a=new combox("a","fason") a.init() /*作用方法： var obj=new combox(var1,var2) var1:新生成的combox变量(如:a) var2:原下拉框的name obj.init():对象初始化 注意:后台取值时用combox_var2进行取值 */ </script> <p align="right">作者：<a href="http://fason.nease.net">fason(阿信）</a>欢迎交流!</p> </body> </html> 下面这段代码更强！ <input type="text" name="t"> <select name="s" onChange="t.value=this.options[this.selectedIndex].value;"> <option>-----------</option> <option value="test">test</option> <option value="haha">haha</option> </select>
<html> <head> <title>Untitled Document</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style> .table1{background-color:white;FONT-FAMILY: Courier New, Courier;font-size:12px} .td_out{FONT-FAMILY: Courier New, Courier;font-size:12px;color:#000000;height:15px;border:1px solid #ffffff;} .td_over{FONT-FAMILY: Courier New, Courier;font-size:12px;cursor:default;background-color:#3366cc;border:1px solid #000000;color:#ffffff;height:15px} .slv{vertical-align:bottom;FONT-FAMILY: Courier New, Courier;font-size:12px;border-left-width:0;border-top-width:0;border-bottom-width:0;border-right:0px solid #000000;vertical-align:middle;height:18px;color:#000000} .down{position:relative;left:-2px;font-size:11px;vertical-align:middle;width:16;height:16;color:#2050b0;background-color:#D0DFF7;border:1px solid #9fA3Ce;writing-mode:tb-rl;font-weight:bold } .seldiv{ position:absolute;z-index:1000;overflow-x:hidden;border-left:1px solid #000000;border-bottom:1px solid #000000;border-right:1px solid #000000; SCROLLBAR-FACE-COLOR: #d0dff7; SCROLLBAR-HIGHLIGHT-COLOR: #d0dff7; SCROLLBAR-SHADOW-COLOR: #FFFFFF; SCROLLBAR-3DLIGHT-COLOR: #FFFFFF; SCROLLBAR-ARROW-COLOR: #ffffff; SCROLLBAR-TRACK-COLOR: #ffffff; SCROLLBAR-DARKSHADOW-COLOR: #d0dff7} </style> <script language="JavaScript"> document.onclick=hiddenDiv; function getDivCount() { var arr=document.all; re=0; for (i=0;i<arr.length;i++) { str=arr[i].id; if (str.indexOf("ZfDiv_")==0) { re++; } } return re; } function getI(ObjId) {//取得objId的最后一位数字 for (i=0;i<ObjId.length;i++) { if (ObjId.charAt(i)=="_") return ObjId.substr(i+1,ObjId.length-1); } return 0; } function select_edit(TextObj){//鼠标经过高亮度 TextObj.focus();TextObj.select(); } function checkValue(ID){ var sl=document.all["ZfText_"+ID]; var sv=document.all["ZfDiv_"+ID]; var da=document.all["ZfData_"+ID]; sv.style.display='' for(i=0;i<da.rows.length;i++)da.rows[i].style.display='' for(i=0;i<da.rows.length;i++){ if(da.rows[i].cells[0].innerText.indexOf(sl.value)!=0)da.rows[i].style.display='none'; getPosition(ID); } } function getL(e){ var l=e.offsetLeft; while(e=e.offsetParent){ l+=e.offsetLeft; } return l } function getT(e){ var t=e.offsetTop; while(e=e.offsetParent){ t+=e.offsetTop; } return t } function getPosition(ID){ var sv=document.all["ZfDiv_"+ID]; var sl=document.all["ZfText_"+ID]; var spn=document.all["ZfSpan_"+ID]; var da=document.getElementByIdx("ZfData_"+ID); sv.style.pixelWidth=spn.offsetWidth; da.style.pixelWidth=sv.offsetWidth; sv.style.pixelLeft=getL(spn); sv.style.pixelTop=getT(spn)+sl.offsetHeight+3; if(da.offsetHeight>200){ sv.style.pixelHeight=200; sv.style.overflowY='scroll'; } else { sv.style.pixelHeight=da.offsetHeight; sv.style.overflowY='hidden'; } } function dropDown(ID){ var sv=document.all["ZfDiv_"+ID] var tb=document.all["ZfData_"+ID] if(sv.style.display=='none'){ sv.style.display=''; for(i=0;i<tb.rows.length;i++)tb.rows[i].style.display='' getPosition(ID); } else { sv.style.display='none'; } }//下拉摸拟层 function hiddenDiv(){ var o=window.event.srcElement.id; var tb var sv if(o=="") { for (j=0;j<getDivCount();j++) { tb=document.getElementByIdx('ZfData_'+j); sv=document.getElementByIdx('ZfDiv_'+j); for(i=0;i<tb.rows.length;i++) tb.rows[i].style.display=''; sv.style.display='none'; } } }//隐藏模拟层 function setValue(obj){ var i=getI(obj.parentElement.parentElement.parentElement.id); //alert(obj.parentElement.parentElement.parentElement.id); var sl=document.all["ZfText_"+i]; var sv=document.all['ZfDiv_'+i]; sl.value=obj.innerText; sv.style.display='none'; //sldIndex=obj.parentElement.rowIndex; }//给文本框赋值 function over(obj){ obj.className="td_over" obj.title=obj.innerText obj.focus(); }//鼠标经过变色 function out(obj){ obj.className="td_out" }//鼠标离开还原 function String.prototype.Trim(){return this.replace(/(^\s*)|(\s*$)/g,'')}//自定义去空格函数Trim() //增加list的接口,ID表示该组控件是页面中的第几个 function add(v,ID){ var sv=document.all['ZfDiv_'+ID]; if(!v.Trim()){return;} var tb=document.all['ZfData_'+ID]; var c=tb.insertRow(tb.rows.length).insertCell(); c.innerHTML='<nobr>'+v.Trim()+'</nobr>'; c.onmouseover=new Function("over(this)"); c.onmouseout=new Function("out(this)"); c.onclick=new Function("setValue(this)"); c.className="td_out"; v=''; } //增加inpnubox的接口,在页面中产生一个inputbox控件,下拉列表为空 function addText(name,DefValue) { var i=getDivCount(); document.write('<span id="ZfSpan_'+i+'" style="border:1 solid #9CA0CB">'); document.write('<input type="text" value="'+DefValue+'" name="'+name+'" id="ZfText_'+i+'" ondblclick="ZfDrop_'+i+'.click()" class="slv" onmouseover="select_edit(this)" onkeyup="checkValue('+i+')"><input type=button id="ZfDrop_'+i+'" value=">" onclick="this.hideFocus=true;dropDown('+i+');" class="down" onmouseover="this.style.backgroundColor=#EEF3FD" onmouseout="this.style.backgroundColor=\'\'" onmousedown="this.style.backgroundColor=#ABC4F5" onmouseup="this.style.backgroundColor=\'\'"></span>'); document.write('<div id="ZfDiv_'+i+'" class="seldiv" style="display:none;"><table id="ZfData_'+i+'" onselectstart="return false" border="0" cellspacing="0" cellpadding="0" class="table1"></table></div>'); } </script> </head> <body> <script language="JavaScript"> addText("name1","a"); add("1234",0); add("1234",0); addText("name1","a"); add("1234",1); add("1234",1); </script> </body> </html>