JavaScript parseMoney
March 31st, 2005In order to change the input number format to currency format, e.g. 12500 => 12,500. The javascript code I write as follows:
function parseMoney(objID) {
var obj = document.all[objID]; //get the object
if(obj.value=='') {
return; //do no job when the value is empty
}
//check number format
var chkstr = replaceAll(obj.value, ',', '');
if(chkstr!='' && isNaN(chkstr)) {
alert('Please enter the right number format!');
obj.focus(); //focus the object let user remodify
return;
}
//check negative format
var negative = false;
if(chkstr.indexOf('-')>=0) {
negative = true;
chkstr = chkstr.replace('-', '');
//omit negative character in advance
//to prevent -0
}
var mArray = chkstr.split('.');
if(mArray[0]=='') { //in case .xx
mArray[0] = '0';
}
obj.value = parseInt(mArray[0], 10);
//give back the negative char
var money = (negative) ? ('-' + obj.value) : obj.value;
var retstr = '';
for(var i=money.length-1; i>=0; i--) {
retstr += money.charAt(money.length-1-i);
//add comma if it is thousands digit
//remember to leave out negative char
if(i%3==0 && i>0 && retstr!='-') {
retstr += ',';
}
}
if(mArray.length>1) {
//decimal point exist
retstr += '.';
var decimal = '';
var flag = false;
for(var i=mArray[1].length-1; i>=0; i--) {
if(!flag && mArray[1].charAt(i)=='0') {
continue;
}
else if(!flag) {
flag = true;
}
decimal = mArray[1].charAt(i) + decimal;
}
if(decimal=='') { //in case x.000
decimal = '0';
}
retstr += decimal;
}
if(parseFloat(retstr)=='0') {
retstr = '0'; //in case 0.0 或 -0.0
}
obj.value = retstr;
}
function replaceAll(str, from, to) {
var idx = str.indexOf(from);
while(idx>-1) {
str = str.replace(from, to);
idx = str.indexOf(from);
}
return str;
}
See the test page
