How to loop through a plain JavaScript object with the objects as members
for (var key in validation_messages) { // skip loop if the property is from prototype if (!validation_messages.hasOwnProperty(key)) continue; var obj = validation_messages[key]; for (var prop in obj) { // skip loop if the property is from prototype if (!obj.hasOwnProperty(prop)) continue; // your code alert(prop + " = " + obj[prop]); }}
Under ECMAScript 5, you can combine Object.keys() and Array.prototype.forEach():
var obj = { first: "John", last: "Doe"};//// Visit non-inherited enumerable keys//Object.keys(obj).forEach(function(key) { console.log(key, obj[key]);});
The problem with this
for (var key in validation_messages) { var obj = validation_messages[key]; for (var prop in obj) { alert(prop + " = " + obj[prop]); }}is that you’ll also loop through the primitive object's prototype.
With this one you will avoid it:
for (var key in validation_messages) { if (validation_messages.hasOwnProperty(key)) { var obj = validation_messages[key]; for (var prop in obj) { if (obj.hasOwnProperty(prop)) { alert(prop + " = " + obj[prop]); } } }}