js使下拉列表框可编辑不止是选择_javascript技巧

<script> <BR>function clearOption(obj,e){ <BR>var currKey=0,e=e||event; <BR>currKey=e.keyCode||e.which||e.charCode; <BR>if(currKey == 8){ <BR>obj.options[0].text = ""; <BR>} <BR>} <BR>function writeSelect(obj,e){ <BR>var currKey=0,e=e||event; <BR>currKey=e.keyCode||e.which||e.charCode; <BR>obj.options[0].selected = "select"; <BR>if(currKey != 8){//这个地方是为了避免在firefox又出现令人厌烦的乱码,可以试试注释这句话，看看在firefox的效果 <BR>obj.options[0].text = obj.options[0].text + String.fromCharCode(currKey); <BR>} <BR>e.returnValue=false; <BR>return obj.options[0].text; <BR>} <BR>function ttt(){ <BR>var jg = document.getElementById("aa").options[document.getElementById("aa").selectedIndex].text; <BR>//当然也可以在前面的writeSelect函数里面同时设置options的value，这样的话，直接可以在该程序里面用value取出 <BR>jQuery("#aa").empty(); <BR>jQuery("#aa").append("<option value=''>"); <BR>} <br><br></script>

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