statetree

Data-oriented architecture for web applications.

Installation

$ npm install --save-dev statetree

AsyncData

AsyncData is a wrapper for objects that are often updated, changed and synced.

Initialization

var User = new AsyncData();

Properties

User._loaded        // identification that the object is loaded or not
User._updating      // identification that the object is updating or not
User._changed       // identification that the object has been changed locally (and is not saved)
User._old_value     // contains old version of the object
User._error         //
User._error_message //

Methods

getPromise

---

Returns a Promise object which you can use to know if the data has been loaded/updated.

User.getPromise().then(function() {
    console.log(User.Name + 'has been updated');
})

_update

---

Calls resolve when data is received from the server, merges data.

User.setUpdating(function(apply, error, reject) {
    $http
        .post('/api/users', User)
        .success(function() {
            apply();
        })
        .error(function() {
            reject();
            error();
        })
})

isChanged

---

Checks if the object has been changed locally.

if(User.isChanged()) console.log(User.Name + 'changed');

getChangedFields

---

Returns fields that have been changed locally.

User.setUpdating(function(apply, error, reject) {
    $http
        .post('/api/users', User.getChangedFields())
        .success(function() {
            apply();
        })
        .error(function() {
            reject();
            error();
        })
})

revert

---

Revert old value

User.setUpdating(function(apply, error, reject) {
    $http
        .post('/api/users', User)
        .success(function() {
            apply();
        })
        .error(function() {
            reject();
            User.revert();
        })
})