cypress-example-kitchensink/app/assets/js/todo/helpers.js

This is an example app used to showcase Cypress.io End-to-End (E2E) testing. For a full reference of our documentation, go to https://docs.cypress.io

/*
 * Forked from TodoMVC
 * https://todomvc.com
 *
 * MIT License © Addy Osmani, Sindre Sorhus, Pascal Hartig, Stephen Sawchuk
 */

(function (window) {
  'use strict'

  // Get element(s) by CSS selector:
  window.qs = function (selector, scope) {
    return (scope || document).querySelector(selector)
  }

  window.qsa = function (selector, scope) {
    return (scope || document).querySelectorAll(selector)
  }

  // addEventListener wrapper:
  window.$on = function (target, type, callback, useCapture) {
    target.addEventListener(type, callback, !!useCapture)
  }

  // Attach a handler to event for all elements that match the selector,
  // now or in the future, based on a root element
  window.$delegate = function (target, selector, type, handler) {
    function dispatchEvent (event) {
      let targetElement = event.target
      let potentialElements = window.qsa(selector, target)
      let hasMatch = Array.prototype.indexOf.call(potentialElements, targetElement) >= 0

      if (hasMatch) {
        handler.call(targetElement, event)
      }
    }

    // https://developer.mozilla.org/en-US/docs/Web/Events/blur
    let useCapture = type === 'blur' || type === 'focus'

    window.$on(target, type, dispatchEvent, useCapture)
  }

  // Find the element's parent with the given tag name:
  // $parent(qs('a'), 'div');
  window.$parent = function (element, tagName) {
    if (!element.parentNode) {
      return
    }

    if (element.parentNode.tagName.toLowerCase() === tagName.toLowerCase()) {
      return element.parentNode
    }

    return window.$parent(element.parentNode, tagName)
  }

  // Allow for looping on nodes by chaining:
  // qsa('.foo').forEach(function () {})
  NodeList.prototype.forEach = Array.prototype.forEach
})(window)