Code:
Ext.ux.MoneyField = function(config){
var defConfig = {
autocomplete: 'off',
allowNegative: true,
format: 'USD',
currency: '$',
showCurrency: true,
unmaskRe: /[^0-9.-]/g,
getUnmasked: true
};
Ext.applyIf(config,defConfig);
Ext.ux.MoneyField.superclass.constructor.call(this, config);
};
Ext.extend(Ext.ux.MoneyField, Ext.form.TextField,{
/*initComponent:function() {
},*/
initEvents : function(){
Ext.ux.MoneyField.superclass.initEvents.call(this);
this.el.on("keydown",this.stopEventFunction,this);
this.el.on("keyup", this.mapCurrency,this);
this.el.on("keypress", this.stopEventFunction,this);
},
KEY_RANGES : {
numeric: [48, 57],
padnum: [96, 105]
},
isInRange : function(charCode, range) {
return charCode >= range[0] && charCode <= range[1];
},
formatCurrency : function(evt, floatPoint, decimalSep, thousandSep) {
if (!this.el) return false;
floatPoint = !isNaN(floatPoint) ? Math.abs(floatPoint) : 2;
thousandSep = typeof thousandSep != "string" ? "," : thousandSep;
decimalSep = typeof decimalSep != "string" ? "." : decimalSep;
var key = (evt.getKey)? evt.getKey() : 0;
if (this.isInRange(key, this.KEY_RANGES["padnum"])) {
key -= 48;
}
this.sign = (this.allowNegative && (key == 45 || key == 109)) ? "-" : (key == 43 || key == 107 || key == 16) ? "" : this.sign;
var character = (this.isInRange(key, this.KEY_RANGES["numeric"]) ? String.fromCharCode(key) : "");
var field = this.el.dom;
var value = (field.value.replace(/\D/g, "").replace(/^0+/g, "") + character).replace(/\D/g, "");
var length = value.length;
if ( character == "" && length > 0 && key == 8) {
length--;
value = value.substr(0,length);
evt.stopEvent();
}
if(field.maxLength + 1 && length >= field.maxLength) return false;
length <= floatPoint && (value = new Array(floatPoint - length + 2).join("0") + value);
for(var i = (length = (value = value.split("")).length) - floatPoint; (i -= 3) > 0; value[i - 1] += thousandSep);
floatPoint && floatPoint < length && (value[length - ++floatPoint] += decimalSep);
field.value = (this.showCurrency && this.currencyPosition == 'left' ? this.currency : '' ) +
(this.sign ? this.sign : '') +
value.join("") +
(this.showCurrency && this.currencyPosition != 'left' ? this.currency : '' );
},
mapCurrency : function(evt) {
switch (this.format) {
case 'BRL':
this.currency = 'R$ ';
this.currencyPosition = 'left';
this.formatCurrency(evt, 2,',','.');
break;
case 'EUR':
this.currency = ' €';
this.currencyPosition = 'right';
this.formatCurrency(evt, 2,',','.');
break;
case 'USD':
this.currencyPosition = 'left';
this.currency = '$';
this.formatCurrency(evt, 2);
break;
default:
this.formatCurrency(evt, 2);
}
},
stopEventFunction : function(evt) {
var key = evt.getKey();
if (this.isInRange(key, this.KEY_RANGES["padnum"])) {
key -= 48;
}
if ( (( key>=41 && key<=122 ) || key==32 || key==8 || key>186) && (!evt.altKey && !evt.ctrlKey) ) {
evt.stopEvent();
}
},
getCharForCode : function(keyCode){
var chr = '';
switch(keyCode) {
case 48: case 96: // 0 and numpad 0
chr = '0';
break;
case 49: case 97: // 1 and numpad 1
chr = '1';
break;
case 50: case 98: // 2 and numpad 2
chr = '2';
break;
case 51: case 99: // 3 and numpad 3
chr = '3';
break;
case 52: case 100: // 4 and numpad 4
chr = '4';
break;
case 53: case 101: // 5 and numpad 5
chr = '5';
break;
case 54: case 102: // 6 and numpad 6
chr = '6';
break;
case 55: case 103: // 7 and numpad 7
chr = '7';
break;
case 56: case 104: // 8 and numpad 8
chr = '8';
break;
case 57: case 105: // 9 and numpad 9
chr = '9';
break;
case 45: case 189: case 109:
chr = '-';
break;
case 43: case 107: case 187:
chr = '+';
break;
default:
chr = String.fromCharCode(keyCode); // key pressed as a lowercase string
break;
}
return chr;
},
setValue : function(v){
if(this.emptyText && this.el && v !== undefined && v !== null && v !== ''){
this.el.removeClass(this.emptyClass);
}
Ext.form.TextField.superclass.setValue.apply(this, arguments);
this.applyEmptyText();
this.autoSize();
this.mapCurrency(0);
},
getValue : function(){
if(!this.rendered) {
return this.value;
}
var v = this.el.getValue();
if(v === this.emptyText || v === undefined){
v = '';
}
if (v && this.getUnmasked)
v = v.replace(this.unmaskRe, '');
return v;
}
});
Ext.reg('moneyfield', Ext.ux.MoneyField);
Thanks! Valeu! 
Ext.ux.MoneyField
