todo page object casperjs

todoPage-casperjs.js

function TodoPage() {
    'use strict';

    var idNew = '#new-todo';
    var title = '#header > h1';
    var children = '#todo-list li';
    
    var nthChild = function(n) {
        return children+':nth-child('+n+')';
    };

    var nthChildAndSelector = function(selector,n) {
        return nthChild(n) + selector;
    };

    var nthLabel = _.partial(nthChildAndSelector,' label');
    var nthInput = _.partial(nthChildAndSelector,' input.edit');
    var nthDestroyBtn = _.partial(nthChildAndSelector,' button.destroy');
    var nthCheckbox = _.partial(nthChildAndSelector,' input.toggle');
    var nthHidden = _.partial(nthChildAndSelector,'.hidden');
    var nthNotHidden = _.partial(nthChildAndSelector,':not(.hidden)');

    this.before = function() {

        casper.start(casper.cli.get("urlstart"), function() {
            return casper.evaluate(function() {
                window.localStorage.clear();
            });
        });

    };

    this.test = function(fn) {
        casper.then(fn);
    }

    this.titleList = function() {
        return casper.evaluate(function(selector) {
            return __utils__.findOne(selector).textContent;
        },title);
    };

    this.typeNew = function(newTodo) {
        casper.sendKeys(idNew, newTodo);
        return this;
    };

    this.enterNew = function() {
        casper.sendKeys(idNew, casper.page.event.key.Enter);
    };

    this.nbVisible = function() {
        return casper.evaluate(function(selector) {
            return _.chain(_.toArray(__utils__.findAll(selector)))
                        .filter(function(element){return window.getComputedStyle(element).display !== 'none';})
                        .reduce(function(count) { return ++count;},0)
                        .value();
        },children);
    };

    this.nthText = function(nth) {
        return casper.evaluate(function(selector) {
            return __utils__.findOne(selector).textContent;
        },nthLabel(nth));
    };

    this.mouseOverNth = function(nth) {
        mouse.move(nthChild(nth));
        return this;
    };

    this.deleteNth = function(nth) {
        casper.click(nthDestroyBtn(nth));
    };

    this.done = function(nth) {
        casper.click(nthCheckbox(nth));
    };

    this.nthCompleted = function(nth) {
        return casper.evaluate(function(selector) {
            return __utils__.findOne(selector).checked;
        },nthCheckbox(nth));
    };

    this.doubleClickNth = function(nth) {
        mouse.doubleclick(nthLabel(nth));
    };

    this.editNth = function(nth,todo) {
        casper.sendKeys(nthInput(nth),todo);
        return this;
    };

    this.enterNth = function(nth) {
        casper.sendKeys(nthInput(nth), casper.page.event.key.Enter);
    };

    this.first = _.partial(this.nthText,1);
    this.mouseOverFirst = _.partial(this.mouseOverNth,1);
    this.deleteFirst = _.partial(this.deleteNth,1);
    this.doubleClickFirst = _.partial(this.doubleClickNth,1);
    this.editFirst = _.partial(this.editNth,1);
    this.enterFirst = _.partial(this.enterNth,1);
}

module.exports = new TodoPage();