Object.extend(String.prototype, { pad : function(side, len, chr) { if (!chr) chr = ' '; var s = this; var left = side.toLowerCase()=='left'; while (s.length<len) s = left? chr + s : s + chr; return s; }, padLeft : function(len, chr) { return this.pad('left',len,chr); }, padRight : function(len, chr) { return this.pad('right',len,chr); }, zerofill : function(len) { return this.padLeft(len,'0'); }, trim : function() { return this.replace(/^\s+|\s+$/g,''); }, trimLeft : function() { return this.replace(/^\s+/,''); }, trimRight : function() { return this.replace(/\s+$/,''); }, /** * Convert period separated function names into a function reference. * e.g. "Prado.AJAX.Callback.Action.setValue".toFunction() will return * the actual function Prado.AJAX.Callback.Action.setValue() * @return Function the corresponding function represented by the string. */ toFunction : function() { var commands = this.split(/\./); var command = window; commands.each(function(action) { if(command[new String(action)]) command=command[new String(action)]; }); if(isFunction(command)) return command; else { if(typeof Logger != "undefined") Logger.error("Missing function", this); return Prototype.emptyFunction; } }, /** * Convert a string into integer, returns null if not integer. * @return {integer|null} null if string does not represent an integer. */ toInteger : function() { var exp = /^\s*[-\+]?\d+\s*$/; if (this.match(exp) == null) return null; var num = parseInt(this, 10); return (isNaN(num) ? null : num); }, /** * Convert a string into a double/float value. <b>Internationalization * is not supported</b> * @param {string} the decimal character * @return {float|null} null if string does not represent a float value */ toDouble : function(decimalchar) { decimalchar = decimalchar || "."; var exp = new RegExp("^\\s*([-\\+])?(\\d+)?(\\" + decimalchar + "(\\d+))?\\s*$"); var m = this.match(exp); if (m == null) return null; var cleanInput = m[1] + (m[2].length>0 ? m[2] : "0") + "." + m[4]; var num = parseFloat(cleanInput); return (isNaN(num) ? null : num); }, /** * Convert strings that represent a currency value (e.g. a float with grouping * characters) to float. E.g. "10,000.50" will become "10000.50". The number * of dicimal digits, grouping and decimal characters can be specified. * <i>The currency input format is <b>very</b> strict, null will be returned if * the pattern does not match</i>. * @param {string} the grouping character, default is "," * @param {int} number of decimal digits * @param {string} the decimal character, default is "." * @type {float|null} the currency value as float. */ toCurrency : function(groupchar, digits, decimalchar) { groupchar = groupchar || ","; decimalchar = decimalchar || "."; digits = typeof(digits) == "undefined" ? 2 : digits; var exp = new RegExp("^\\s*([-\\+])?(((\\d+)\\" + groupchar + ")*)(\\d+)" + ((digits > 0) ? "(\\" + decimalchar + "(\\d{1," + digits + "}))?" : "") + "\\s*$"); var m = this.match(exp); if (m == null) return null; var intermed = m[2] + m[5] ; var cleanInput = m[1] + intermed.replace( new RegExp("(\\" + groupchar + ")", "g"), "") + ((digits > 0) ? "." + m[7] : ""); var num = parseFloat(cleanInput); return (isNaN(num) ? null : num); } });