有输入功能的HTML下拉框

<DIV style="POSITION: absolute">
<TABLE cellSpacing=0 cellPadding=0 border=0>
<TBODY>
<TR>
<TD>
<SELECT name="districtSelect" style="LEFT: 0px; TOP: 0px; WIDTH: 100px; CLIP: rect(0px auto auto 80px); POSITION: absolute" onchange="document.getElementById('district').value=this.options[this.selectedIndex].value">
<OPTION value="北京" selected>北京</OPTION>
<OPTION value="上海">上海</OPTION>
<OPTION value="广州">广州</OPTION>
<OPTION value="深圳">深圳</OPTION>
</SELECT>
<INPUT id="district" name="district" style="LEFT: 0px; TOP: 0px; WIDTH: 81px; POSITION: absolute">
</TD>
</TR>
</TBODY>
</TABLE>
</DIV>

来源：网络