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bindable-object

v0.0.9

Published

Two-way data binding means linking properties of two separate objects - when one changes, the other will automatically update with that change. It enables much easier interactions between data models and UIs, among other uses outside of MVC.

Downloads

38

Readme

Build Status Coverage Status

Fast data-binding library.

Two-way data binding means linking properties of two separate objects - when one changes, the other will automatically update with that change. It enables much easier interactions between data models and UIs, among other uses outside of MVC.

Example

var BindableObject = require("bindable-object");

var person = new BindableObject({
  name: "craig",
  last: "condon",
  location: {
    city: "San Francisco"
  }
});

person.bind("location.zip", function(value) {
  // 94102
}).now();

//triggers the binding
person.set("location.zip", "94102");

//bind location.zip to another property in the model, and do it only once
person.bind("location.zip", function (zip) {
  console.log(zip); // 94102
}).now();

person.bind("name, last", function (fn, ln) {
  console.log(fn, ln); // craig condon
}).now();

Installation

npm install bindable-object --save-exact

BindableObject(properties)

creates a new bindable object

value get(property)

Returns a property on the bindable object

var obj = new BindableObject({ city: { name: "SF" } });
console.log(obj.get("city"));      // { name: "SF" }
console.log("no getter", obj.city); // { name: "SF" }
console.log(obj.get("city.name")); // SF
console.log("no getter", obj.city.name); // { name: "SF" }

set(property, value)

Sets a value to the bindable object

var obj = new BindableObject();
obj.set("city.name", "SF");
console.log(obj.get("city.name")); // SF

setProperties(properties)

sets multiple properties on the bindable object

var person = new BindableObject();
person.setProperties({
  firstName: "Jon",
  lastName: "Doe"
});
console.log(person.get("firstName"), person.get("lastName")); // Jon Doe

has(property)

Returns true if the bindable object has a given property

var obj = new BindableObject({ count: 0, male: false, name: "craig" });

console.log(obj.has("count")); // true
console.log(obj.has("male")); // true
console.log(obj.has("name")); // true
console.log(obj.has("city")); // false

listener on(event, callback)

adds a new listener to the bindable object

emit(event[,args...])

emits a new event

var person = new BindableObject();

person.on("blarg", function (arg1, arg2) {
  console.log(arg1, arg2);
});

person.emit("blarg", "something!", "something again!!");

once(event, callback)

listens to one event, then disposes the listener.

var person = new BindableObject();

person.once("blarg", function (arg1, arg2) {
  console.log(arg1, arg2);
});

person.emit("blarg", "something!", "something again!!");
person.emit("blarg", "never caught again!");

removeAllListeners([type])

returns all the listeners on the bindable object

binding bind(from, options)

options - the options for the binding

  • to - the property to bind to. Can be a string, array, or function
  • target - the target bindable object. Default is self
  • max - max number of times to run the data-binding
  • when - tests the data-bound value before setting
  • map - transforms the data-bound value
  • bothWays - makes the data-binding bi-directional.
var obj = new BindableObject({ name: "craig" });

// bind the name, but transform it to upper case
obj.bind("name", { to: "name2", map: function (name) {
  return String(name).toUpperCase();
}}).now();

console.log(obj.get("name"), obj.get("name2"));
obj.set("name", "jeff");
console.log(obj.get("name"), obj.get("name2"));

binding.now()

Executes a binding now

var bindable = require("bindable");
var person = new BindableObject({ name: "jeff" });
person.bind("name", function (name, oldName) {
  console.log("binding called, name is: ", name);
}).now();

// above is triggered
person.set("name", "joe");

binding.dispose()

Disposes a binding

var bindable = require("bindable");
var person = new BindableObject({ name: "jeff" });

var binding = person.bind("name", function (name, oldName) {
  console.log("binding called, name is: ", name);
}).now();

binding.dispose();

person.set("name", "jake"); // binding not triggered

Events

Bindable objects emit a few events:

  • change:* - emitted when a property changes on the bindable object. E.g: change:location.zip.
  • change - emitted when any property changes on the bindable object
  • watching - emitted when a property is being watched
  • dispose - emitted when dispose() is called on a bindable object
var person = new BindableObject({ name: "jeff" });

person.on("change:name", function (newName) {
  console.log("the name changed to", newName);
});

person.on("change", function (key, value) {
  console.log("some value has changed: ", key, "=", value);
});

person.on("watching", function (property) {
  console.log("watching ", property);
});

person.on("dispose", function () {
  console.log("the object was disposed");
});

person.set("name", "james");
person.set("city", "sf");
person.bind("name", function(){}); // trigger watching
person.dispose();