<HTML>

<HEAD>

<META http-equiv='Content-Type' content='text/html; charset=gb2312'>

<TITLE>js實(shí)現(xiàn)可輸入的下拉框</TITLE>

</HEAD>

<BODY>

<div style="position:relative;">

<span style="margin-left:100px;width:18px;overflow:hidden;">

<select style="width:118px;margin-left:-100px" onchange="this.parentNode.nextSibling.value=this.value">

<option value="德國">德國</option>

<option value="挪威">挪威</option>

<option value="瑞士"> 瑞士</option>

</select></span><input name="box" style="width:100px;position:absolute;left:0px;">

</div>

</BODY>

</HTML>

實(shí)現(xiàn)方式二

復(fù)制代碼代碼如下:

<select id="select" onkeydown="Select.del(this,event)" onkeypress="Select.write(this,event)">

<option value=""></option>

<option value="aaa">aaa</option>

<option value="bbb">bbb</option>

<option value="ccc">ccc</option>

</select>

<input type="button" value="獲取選擇值" id="test" onclick="test();"/>

<script>

var Select = {

del : function(obj,e){

if((e.keyCode||e.which||e.charCode) == 8){

var opt = obj.options[0];

opt.text = opt.value = opt.value.substring(0, opt.value.length>0?opt.value.length-1:0);

}

},

write : function(obj,e){

if((e.keyCode||e.which||e.charCode) == 8)return ;

var opt = obj.options[0];

opt.selected = "selected";

opt.text = opt.value += String.fromCharCode(e.charCode||e.which||e.keyCode);

}

}

function test(){

alert(document.getElementById("select").value);

}

</script><br />