Quenda NPM | npm.io

Quenda

Quenda is a simple javascript function queue. With quenda you can create queues of functions and execute them in order with a delay. It also has controls for executing next and previous functions, playing and pausing the queue and many more...

IE9+
No jQuery needed.
Just one dependency: merge
AMD and CommonJS compatible.
Works both node and browser environments.

Install

npm install quenda

bower install quenda

Using in a CommonJS environment (node, webpack, ...)

var Quenda = require('quenda');
var myQueue = Quenda.new();
//..

Using in a AMD environment (requirejs, webpack,...)

require(['quenda'], function(Quenda) {
  var myQueue = Quenda.new();
  //..
});

Using without any module loader

<script type="text/javascript" src="path/to/your/merge/download/folder/merge.js">
<script type="text/javascript" src="path/to/your/quenda/download/folder/dist/quenda.min.js">

<script type="text/javascript">
    var myQueue = Quenda.new();
    //...
</script>

Simple example

You can easily create new queues like this:

require(['quenda'], function(Quenda) {

  var myQueue = Quenda.new().add([
    {
        nextDelay: 2000,
        fn: function() {
            console.log('first');
        }
    },
    {
        fn: function() {
            console.log('second');
        }
    }
  ]);

  myQueue.play();

  console.log(Quenda.getAll()); //Prints an array with all the queues (1 queue in this case)
});

After executing this code you will se in your console log output the word 'first' and after 2 seconds the word 'second'.

Advanced example

Check demo/index.html for a more complex example.

Main object (Quenda) API

Quenda is the main object that creates and stores queues.

Method	Description
new(config)	Creates new queues (see below for config options)
getAll()	Get an array with all queues
delete(index)	Delete a queue by index
deleteAll()	Deletes all queues

New queue config options

Variable	Default Value	Description	Type
loop	false	Defines if the queue should loop.	boolean
maxLoops	Infinity	Defines the max number of loops.	number (integer)
defaultDelay	undefined	Define the default delay for the queue steps with no delay defined.	number (ms)

Queues API

The new queues created with Quenda.new() have this API:

Method	Description
add(stepConfig)	Adds a step to the queue (see below for config options)
play()	Plays the queue
pause()	Pauses the queue
next()	Executes the next step in the queue. Loops if the queue is configured to loop.
prev()	Executes the previous step in the queue. Does not loop, stops when the queue reaches the first element.

New step config options

You can create new steps using Quenda.new(stepConfig) and also Quenda.new(stepConfig, stepConfig, ...). See basic example above.

Variable	Description	Type
nextDelay	The number of miliseconds to wait before executing the next step. If it is not present the queue will stop unless it is configured with a defaultDelay value (see avobe).	number (ms)
fn	Function to execute in this step. The this value is binded to the queue itself and the first argument is the current step. See demo/index.html for an example.	function
autoDestroy	If true the step will be executed once and then removed from the queue.	boolean
preload	An array of image urls that will be preloaded before this step is executed. The time will start to count after the preload is completed. Note: this only works in browser environments.	array