让下拉列表select可编辑的简便方法

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2 < select name ="markcode" onChange ="editable(this);" >
3 < option value ="value1" > 选项一 </ option >
4 < option value ="" > 请输入 </ option >
5 </ select >
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8
9 < script language ="javascript" >
10 function editable(select1){
11 if (select1.value == "" ){
12 var newvalue = prompt( " 请输入 " , "" );
13 if (newvalue){
14 addSelected(select1,newvalue,newvalue);
15 }
16 }
17 }
18
19 function addSelected(fld1,value1,text1){
20 if (document.all){
21 var Opt = fld1.document.createElement( " OPTION " );
22 Opt.text = text1;
23 Opt.value = value1;
24 fld1.options.add(Opt);
25 Opt.selected = true ;
26 } else {
27 var Opt = new Option(text1,value1, false , false );
28 Opt.selected = true ;
29 fld1.options[fld1.options.length] = Opt;
30 }
31 }
32 </ script >
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