<form name= form>
<input class="field" name=money onkeyup="number_format(this)">
</form>
<script language="javascript">
function number_format(f) {
var val = f.value;
var len = val.length;
var number_format1 = "", number_format2 = "";
var c = 0;
if(val.charCodeAt(len-1)<48 || val.charCodeAt(len-1)>57) {
alert("숫자만 입력해주세요");
f.value = val.substr(0, (len-1));
}else{
if(len > 3) {
for(i = 0 ; i < len; i++){
one = val.charAt(i)
if(one != ",") number_format1 += one;
}
var number_format1_len = number_format1.length;
var in_c = number_format1_len%3;
if(!in_c) in_c = 3;
for(i = 0 ; i < number_format1_len; i++){
number_format2_one = number_format1.charAt(i)
if(i == in_c){
number_format2 += ",";
in_c = 3+in_c;
}
number_format2 += number_format2_one;
}
f.value = number_format2;
}
}
}
</script>
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