Javascript iterating through a set of properties

Question

Hi I have created a function object that contains a set of properties.This is what I have:

function LoginModelDTO(data) {
    var self = this;

    self.UserName = ko.observable(data.UserName).extend({
        minLength: {
            params: 25,
            message: "Username should have at least 25 chars"
        },
        required: {

            message: "Username is required"
        },
        maxLength: {
            params: 50,
            message: "Username should not have more then 50 chars"
        },
        trackChanges: null
    });
    self.Password = ko.observable(data.Password).extend({
        stringLength: {
            params: 25,

        },
        required: {

            message: "Password is required"
        },
        trackChanges: null
    });
    self.RememberMe = ko.observable(data.RememberMe).extend({
        trackChanges: null
    });

self.isValid = ko.computed(function () {
        var bool = self.FirstName.isValid() &&
            self.Username.isValid() &&
            self.Password.isValid() &&
            self.RememberMe() &&
        return bool;
    });
}

What I would like is to be able to find a way to iterate over each property and ask if it's valid without writing every property every time because I also have to write a similar structure like self.isValid for hasChanges , revertChanges etc.

Furthermore I will need to create other similar objects to LoginModelDTO that have around 30-35 properties.This will result in alot of code and a bigger javascript file then needed.

Is there any way I can iterate only threw the properties and check if they are valid? isValid should be skipped

Answer 1

eis gave you part of it in the comments, and Misters gave you a part in the answer, but here's it all together:

var allValidatablesAreValid = true;
for (var property in self)
{
    if (self.hasOwnProperty(property) && self[property]["isValid"]) {
        allValidatablesAreValid = allValidatablesAreValid && self[property].isValid();
    }
    // You can add an early bail out here:
    // if (!allValidatablesAreValid) { break; }
}