Javascript: mostrar el contenido de un objeto

Para imprimir el contenido completo de un objeto, en Firefox, podemos utilizar la siguiente instrucción:

alert(object.toSource());

También se puede acceder a todos los elementos de un objeto mediante un bucle foreach. La siguiente función ImprimirObjeto monstrará un alert() que muestra todas las propiedades y los valores respectivos.

function ImprimirObjeto(o) {
  var salida = '';
  for (var p in o) {
    salida += p + ': ' + o[p] + '\n';
  }
  alert(salida);
}

Por ejemplo:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>imprimir objeto</title>
<script type="text/javascript">
function ImprimirObjeto(o) {
  var salida = '';
  for (var p in o) {
    salida += p + ': ' + o[p] + '\n';
  }
  alert(salida);
}
var Objeto = {'algo1': 1, 'algo2': 2};
</script>
</head>
<body>
<a href="javascript:ImprimirObjeto(Objeto);">mostrar</a>
</body>
</html>

Fuente tomada de: http://webintenta.com/javascript-mostrar-el-contenido-de-un-objeto.html 

Dar formato a números en javascript

function formato_numero(numero, decimales, separador_decimal, separador_miles){ // v2007-08-06
    numero=parseFloat(numero);
    if(isNaN(numero)){
        return "";
    }
    if(decimales!==undefined){
        // Redondeamos
        numero=numero.toFixed(decimales);
    }
    // Convertimos el punto en separador_decimal
    numero=numero.toString().replace(".", separador_decimal!==undefined ? separador_decimal : ",");
    if(separador_miles){
        // Añadimos los separadores de miles
        var miles=new RegExp("(-?[0-9]+)([0-9]{3})");
        while(miles.test(numero)) {
            numero=numero.replace(miles, "$1" + separador_miles + "$2");
        }
    }
    return numero; }


Tomado de: http://www.antisacsor.com/articulo/10_98_dar-formato-a-numeros-en-javascript

Crear reglas de validación personalizadas con el plugin de JQuery

(function() {
 
 function stripHtml(value) {
  // remove html tags and space chars
  return value.replace(/<.[^<>]*?>/g, ' ').replace(/&nbsp;|&#160;/gi, ' ')
  // remove numbers and punctuation
  .replace(/[0-9.(),;:!?%#$'"_+=\/-]*/g,'');
 }
 jQuery.validator.addMethod("maxWords", function(value, element, params) { 
     return this.optional(element) || stripHtml(value).match(/\b\w+\b/g).length < params; 
 }, jQuery.validator.format("Please enter {0} words or less.")); 
  
 jQuery.validator.addMethod("minWords", function(value, element, params) { 
     return this.optional(element) || stripHtml(value).match(/\b\w+\b/g).length >= params; 
 }, jQuery.validator.format("Please enter at least {0} words.")); 
  
 jQuery.validator.addMethod("rangeWords", function(value, element, params) { 
     return this.optional(element) || stripHtml(value).match(/\b\w+\b/g).length >= params[0] && value.match(/bw+b/g).length < params[1]; 
 }, jQuery.validator.format("Please enter between {0} and {1} words."));

})();

jQuery.validator.addMethod("letterswithbasicpunc", function(value, element) {
 return this.optional(element) || /^[a-z-.,()'\"\s]+$/i.test(value);
}, "Letters or punctuation only please");  

jQuery.validator.addMethod("alphanumeric", function(value, element) {
 return this.optional(element) || /^\w+$/i.test(value);
}, "Letters, numbers, spaces or underscores only please");  

jQuery.validator.addMethod("lettersonly", function(value, element) {
 return this.optional(element) || /^[a-z]+$/i.test(value);
}, "Letters only please"); 

jQuery.validator.addMethod("nowhitespace", function(value, element) {
 return this.optional(element) || /^\S+$/i.test(value);
}, "No white space please"); 

jQuery.validator.addMethod("ziprange", function(value, element) {
 return this.optional(element) || /^90[2-5]\d\{2}-\d{4}$/.test(value);
}, "Your ZIP-code must be in the range 902xx-xxxx to 905-xx-xxxx");

jQuery.validator.addMethod("integer", function(value, element) {
 return this.optional(element) || /^-?\d+$/.test(value);
}, "A positive or negative non-decimal number please");

/**
* Return true, if the value is a valid vehicle identification number (VIN).
*
* Works with all kind of text inputs.
*
* @example <input type="text" size="20" name="VehicleID" class="{required:true,vinUS:true}" />
* @desc Declares a required input element whose value must be a valid vehicle identification number.
*
* @name jQuery.validator.methods.vinUS
* @type Boolean
* @cat Plugins/Validate/Methods
*/ 
jQuery.validator.addMethod(
 "vinUS",
 function(v){
  if (v.length != 17)
   return false;
  var i, n, d, f, cd, cdv;
  var LL    = ["A","B","C","D","E","F","G","H","J","K","L","M","N","P","R","S","T","U","V","W","X","Y","Z"];
  var VL    = [1,2,3,4,5,6,7,8,1,2,3,4,5,7,9,2,3,4,5,6,7,8,9];
  var FL    = [8,7,6,5,4,3,2,10,0,9,8,7,6,5,4,3,2];
  var rs    = 0;
  for(i = 0; i < 17; i++){
      f = FL[i];
      d = v.slice(i,i+1);
      if(i == 8){
          cdv = d;
      }
      if(!isNaN(d)){
          d *= f;
      }
      else{
          for(n = 0; n < LL.length; n++){
              if(d.toUpperCase() === LL[n]){
                  d = VL[n];
                  d *= f;
                  if(isNaN(cdv) && n == 8){
                      cdv = LL[n];
                  }
                  break;
              }
          }
      }
      rs += d;
  }
  cd = rs % 11;
  if(cd == 10){cd = "X";}
  if(cd == cdv){return true;}
  return false; 
 },
 "The specified vehicle identification number (VIN) is invalid."
);

/**
  * Return true, if the value is a valid date, also making this formal check dd/mm/yyyy.
  *
  * @example jQuery.validator.methods.date("01/01/1900")
  * @result true
  *
  * @example jQuery.validator.methods.date("01/13/1990")
  * @result false
  *
  * @example jQuery.validator.methods.date("01.01.1900")
  * @result false
  *
  * @example <input name="pippo" class="{dateITA:true}" />
  * @desc Declares an optional input element whose value must be a valid date.
  *
  * @name jQuery.validator.methods.dateITA
  * @type Boolean
  * @cat Plugins/Validate/Methods
  */
jQuery.validator.addMethod(
 "dateITA",
 function(value, element) {
  var check = false;
  var re = /^\d{1,2}\/\d{1,2}\/\d{4}$/;
  if( re.test(value)){
   var adata = value.split('/');
   var gg = parseInt(adata[0],10);
   var mm = parseInt(adata[1],10);
   var aaaa = parseInt(adata[2],10);
   var xdata = new Date(aaaa,mm-1,gg);
   if ( ( xdata.getFullYear() == aaaa ) && ( xdata.getMonth () == mm - 1 ) && ( xdata.getDate() == gg ) )
    check = true;
   else
    check = false;
  } else
   check = false;
  return this.optional(element) || check;
 }, 
 "Please enter a correct date"
);

jQuery.validator.addMethod("dateNL", function(value, element) {
  return this.optional(element) || /^\d\d?[\.\/-]\d\d?[\.\/-]\d\d\d?\d?$/.test(value);
 }, "Vul hier een geldige datum in."
);

jQuery.validator.addMethod("time", function(value, element) {
  return this.optional(element) || /^([01][0-9])|(2[0123]):([0-5])([0-9])$/.test(value);
 }, "Please enter a valid time, between 00:00 and 23:59"
);

/**
 * matches US phone number format 
 * 
 * where the area code may not start with 1 and the prefix may not start with 1 
 * allows '-' or ' ' as a separator and allows parens around area code 
 * some people may want to put a '1' in front of their number 
 * 
 * 1(212)-999-2345
 * or
 * 212 999 2344
 * or
 * 212-999-0983
 * 
 * but not
 * 111-123-5434
 * and not
 * 212 123 4567
 */
jQuery.validator.addMethod("phoneUS", function(phone_number, element) {
    phone_number = phone_number.replace(/\s+/g, ""); 
 return this.optional(element) || phone_number.length > 9 &&
  phone_number.match(/^(1-?)?(\([2-9]\d{2}\)|[2-9]\d{2})-?[2-9]\d{2}-?\d{4}$/);
}, "Please specify a valid phone number");

jQuery.validator.addMethod('phoneUK', function(phone_number, element) {
return this.optional(element) || phone_number.length > 9 &&
phone_number.match(/^(\(?(0|\+44)[1-9]{1}\d{1,4}?\)?\s?\d{3,4}\s?\d{3,4})$/);
}, 'Please specify a valid phone number');

jQuery.validator.addMethod('mobileUK', function(phone_number, element) {
return this.optional(element) || phone_number.length > 9 &&
phone_number.match(/^((0|\+44)7(5|6|7|8|9){1}\d{2}\s?\d{6})$/);
}, 'Please specify a valid mobile number');

// TODO check if value starts with <, otherwise don't try stripping anything
jQuery.validator.addMethod("strippedminlength", function(value, element, param) {
 return jQuery(value).text().length >= param;
}, jQuery.validator.format("Please enter at least {0} characters"));

// same as email, but TLD is optional
jQuery.validator.addMethod("email2", function(value, element, param) {
 return this.optional(element) || /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)*(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i.test(value); 
}, jQuery.validator.messages.email);

// same as url, but TLD is optional
jQuery.validator.addMethod("url2", function(value, element, param) {
 return this.optional(element) || /^(https?|ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)*(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i.test(value); 
}, jQuery.validator.messages.url);

// NOTICE: Modified version of Castle.Components.Validator.CreditCardValidator
// Redistributed under the the Apache License 2.0 at http://www.apache.org/licenses/LICENSE-2.0
// Valid Types: mastercard, visa, amex, dinersclub, enroute, discover, jcb, unknown, all (overrides all other settings)
jQuery.validator.addMethod("creditcardtypes", function(value, element, param) {

 if (/[^0-9-]+/.test(value)) 
  return false;
 
 value = value.replace(/\D/g, "");
 
 var validTypes = 0x0000;
 
 if (param.mastercard) 
  validTypes |= 0x0001;
 if (param.visa) 
  validTypes |= 0x0002;
 if (param.amex) 
  validTypes |= 0x0004;
 if (param.dinersclub) 
  validTypes |= 0x0008;
 if (param.enroute) 
  validTypes |= 0x0010;
 if (param.discover) 
  validTypes |= 0x0020;
 if (param.jcb) 
  validTypes |= 0x0040;
 if (param.unknown) 
  validTypes |= 0x0080;
 if (param.all) 
  validTypes = 0x0001 | 0x0002 | 0x0004 | 0x0008 | 0x0010 | 0x0020 | 0x0040 | 0x0080;
 
 if (validTypes & 0x0001 && /^(51|52|53|54|55)/.test(value)) { //mastercard
  return value.length == 16;
 }
 if (validTypes & 0x0002 && /^(4)/.test(value)) { //visa
  return value.length == 16;
 }
 if (validTypes & 0x0004 && /^(34|37)/.test(value)) { //amex
  return value.length == 15;
 }
 if (validTypes & 0x0008 && /^(300|301|302|303|304|305|36|38)/.test(value)) { //dinersclub
  return value.length == 14;
 }
 if (validTypes & 0x0010 && /^(2014|2149)/.test(value)) { //enroute
  return value.length == 15;
 }
 if (validTypes & 0x0020 && /^(6011)/.test(value)) { //discover
  return value.length == 16;
 }
 if (validTypes & 0x0040 && /^(3)/.test(value)) { //jcb
  return value.length == 16;
 }
 if (validTypes & 0x0040 && /^(2131|1800)/.test(value)) { //jcb
  return value.length == 15;
 }
 if (validTypes & 0x0080) { //unknown
  return true;
 }
 return false;
}, "Please enter a valid credit card number.");