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Manager of jQuery deferreds by name


promiser is a simple manager of deferreds by name. Rather than creating and maintaining references to jQuery.Deferred objects, simply register a handler by name and resolve or reject it by name.

promiser.done('test', function() {
    console.log('hello world');
promiser.isResolved('test'); // true 

The promiser API includes all the methods on the jQuery Deferred object.

Chaining works as expected:

    .done('test1', function() { ... })
    .done('test2', function() { ... })
    .done('test3', function() { ... });

For a more elegant approach, an object can be passed:

    test1: function() { ... },
    test2: function() { ... },
    test3: function() { ... }

It supports the when method:

promiser.when('test1', 'test2', 'test3', function() {
    console.log('all done!');

Promiser can manage other deferred for you:

promiser.manage('ajax', $.ajax({ ... }));

It can also stop managing a deferred:

var xhr = promiser.unmanage('ajax');

You can even reset a deferred. This provides a clean alternative to passing around references to deferred objects:


Deferreds can be watched for when they are initially created. This makes it easy to only execute something if another object needs it:

// Watch for the first time the 'lazy-data' deferrred it bound to'lazy-data', function() {
        success: function(data) {
            promiser.resolve('lazy-data', data);
        error: function(xhr, text, err) {
            promiser.reject('lazy-data', xhr, text, err);
// This executes the watch handler above 
promiser.done('lazy-data', function(data) {
    // do something... 
bower install promiser
npm install promiser

promiser.js works in the browser as well as the Node and AMD environments.

The promiser object can be used three ways:

// It can be used directly 
promiser.done('foo', function() { ... });
// Create promiser objects 
var p1 = new promiser;
p1 instanceof promiser; // true 
// Create a new plain object 
var p1 = promiser();
// Extend an existing object 
var p2 = promiser({});