LooseMachineJS

A simple, easy to use JavaScript library for creating powerfool "loose" state machines with complete freedom, specially suited for complex scenarios. No dependencies required. If you're looking for a standard FSM implementation take a look at the awesome https://github.com/jakesgordon/javascript-state-machine

Interactive demos

https://rawgit.com/rmruano/LooseMachineJS/master/demo_advanced.html https://rawgit.com/rmruano/LooseMachineJS/master/demo_basic.html

Objects

LooseMachine.Action

It's a state machine, it can contain infinite LooseMachine.ActionState with no particular order or restrictions, your code determines the workflow.

LooseMachine.ActionState

It's one of the possible states of the action. i.e: If you've got a 5 step registration process, each one will be an actionState.

LooseMachine.Director

It acts as a semaphore between multiple LooseMachine.Action to assure that only one is being running at the same time. Entering one action/machine will force any other active actions to be stopped (it will leave the action). It will also receive all the events of the Actions & ActionStates.

Basic Usage

<script src="LooseMachine.js"></script>
<script>
    var my3StepAction = new LooseMachine.Action("test");
    my3StepAction.setDefaultState("state1");
    my3StepAction.addState( (new LooseMachine.ActionState("state1"))
        .onEnter(function(actionState) {
            console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
            actionState.getAction().getState("state2").enter(); // Automatically avance to next state
        })
    );
    my3StepAction.addState( (new LooseMachine.ActionState("state2"))
        .onEnter(function(actionState) {
            console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
            actionState.getAction().getState("state2").enter(); // Automatically avance to next state
        })
    );
    my3StepAction.addState( (new LooseMachine.ActionState("state3"))
        .onEnter(function(actionState) {
            console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
            alert("### COMPLETED! ###");
            actionState.getAction().leave(); // Leave the action, it will be automatically reseted
        })
    );
    my3StepAction.enter(); // Run it
</script>

Or, if you prefer a fluent interface:

<script src="LooseMachine.js"></script>
<script>
    var my3StepAction = (new LooseMachine.Action("test", {defaultState:"state1"}))
            .addState( (new LooseMachine.ActionState("state1"))
                .onEnter(function(actionState) {
                    console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
                    actionState.getAction().getState("state2").enter(); // Automatically avance to next state
                })
            ).addState( (new LooseMachine.ActionState("state2"))
                .onEnter(function(actionState) {
                    console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
                    actionState.getAction().getState("state2").enter(); // Automatically avance to next state
                })
            ).addState( (new LooseMachine.ActionState("state3"))
                .onEnter(function(actionState) {
                    console.log("ActionState onEnter:  "+actionState.getAction().getId()+"/"+actionState.getId());
                    alert("### COMPLETED! ###");
                    actionState.getAction().leave(); // Leave the action, it will be automatically reseted
                })
            );
    my3StepAction.enter(); // Run it
</script>

Advanced Usage

Take a look at demo_persistent.html, demo_director.html for examples of persistent states & multiple actions (machines) working simultaneously.

Take a look at demo_advanced.html for advanced features and a more visual approach.

Supported events

LooseMachine.Action

• onEnter( action ) Entering an action (running the machine)
• onLeave( action ) Leaving an action (stopping the machine, it will be resetted)

LooseMachine.ActionState

• onEnter( actionState, isResume ) Entering an action state (isResume will be true if the state is being resumed)
• onLeave( actionState ) Leaving an action state

LooseMachine.Director

• onEnter( action ) Entering an action
• onLeave( action ) Leaving an action
• onEnterState( actionState ) Entering an action state
• onLeaveState( actionState ) Leaving an action state