代码如下:
<input onkeyup="showtips();if(event.keyCode==27)c();" id=txt onkeydown='enterTips()'>(eg. JiangSu)输完按回车键<br> <select id=sel style='display:none' multiple onclick=rv() onkeydown='if(event.keyCode==13)rv()'></select> <script> var msg = new Array("Beijing","Tianjing","Shanghai","Guangdong","ShanDong","Shanxi","Hunan","Hubei","JiangSu","JiangXi"); var msg2=new Array("北京","天津","上海","广东","山东","陕西","湖南","湖北","江苏","江西"); function showtips(){ eo=event.srcElement; sel.length=0; var len=msg.length; var re=new RegExp("^"+eo.value,"i") for(i=0;i<len;i++) if(re.test(msg[i])==true) sel.style.display='',sel.add(new Option(msg[i],msg2[i])),sel.selectedIndex=0; } function enterTips(){ e=event.keyCode; if(sel.style.display!='none'){ if(e==13) event.srcElement.value=sel.value,sel.style.display='none'; if(e==40) sel.focus(); } } function rv(){txt.value=sel.value,c()} function c(){sel.style.display='none';txt.focus()} document.onclick=function(){c()} </script>
[Ctrl+A 全选 提示:你可先修改部分代码,再点运行代码]