chain-of-responsibility.js

let Dispatcher = {
    handleRequest: function (request) {
        handlerList = [new Strategy1(), new Strategy2(), new Strategy3(), new Strategy4()];

        for (var i = 0; i < handlerList.length - 1; i++) {
            handlerList[i].setNext(handlerList[i + 1])
        }
        handlerList[0].handleRequest(request);
    }
};


//Handler
var Handler = function () {
    this.next = {
        handleRequest: function (request) {
            console.log('All strategies exhausted.');
        }
    }
};
Handler.prototype.setNext = function (next) {
    this.next = next;
    return next;
};
Handler.prototype.handleRequest = function (request) {
};

//Strategy1
var Strategy1 = function () {
};
Strategy1.prototype = new Handler();
Strategy1.prototype.handleRequest = function (request) {
    console.log('Strategy1');
    if (request == 1) {
        return;
    }
    this.next.handleRequest(request);
};

//Strategy2
var Strategy2 = function () {
};
Strategy2.prototype = new Handler();
Strategy2.prototype.handleRequest = function (request) {
    console.log('Strategy2');
    if (request == 2) {
        alert('I am handled');

        return;
    }
    this.next.handleRequest(request);
};

//Strategy3
var Strategy3 = function () {
};
Strategy3.prototype = new Handler();
Strategy3.prototype.handleRequest = function (request) {
    console.log('Strategy3');
    if (request == 3) {
        return;
    }
    this.next.handleRequest(request);
}

//Strategy4
var Strategy4 = function () {
};
Strategy4.prototype = new Handler();
Strategy4.prototype.handleRequest = function (request) {
    console.log('Strategy4');
    if (request == 4) {
        return;
    }
    this.next.handleRequest(request);
};