WordPress-like actions for javascript

gistfile1.txt

/**
 * Global object storing all registered actions
 * @type {*[]}
 * @public
 */
window.__actions__ = [];

/**
 * Register an action
 * @param actionName
 * @param callback
 * @param priority
 */
function add_action(actionName, callback, priority) {
    if ( !priority || priority < 0 ) {
        priority = 10;
    }
    
    if ( priority > 100 ) {
        priority = 100;
    }
    
    var actions = window.__actions__;
    
    if ( typeof actions[actionName] == 'undefined' ) {
        actions[actionName] = [];
    }
    
    if ( typeof actions[actionName][priority] == 'undefined' ) {
        actions[actionName][priority] = []
    }
    
    actions[actionName][priority].push( callback );
}

/**
 * Trigger all callbacks registered for the specified action based on their priority
 */
function do_action(/* actionName [, param1, param2, ...]*/) {
    if ( arguments.length === 0 ) {
        return;
    }
    
    var args = Array.prototype.slice.call( arguments ),
        actionName = args.shift(),
        _this = this;
    
    var actions = window.__actions__;
    if ( !actions[actionName] || actions[actionName].length === 0 ) {
        return;
    }
    
    //#! Order by priority
    var priorities = Object.keys( actions[actionName] );
    //#! Do actions
    priorities.forEach( function (priority, v) {
        actions[actionName][priority].forEach( function (callback, v) {
            callback.apply( _this, args );
        } );
    } );
}