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HTML

              
                <main>
  <h1>Continuous Integration (CI) Company Cost Savings Estimator</h1>
  <h3 class="ref-repo">
    <a class="ref-repo__link" href="https://github.com/yowainwright/developer-ci-benefits">
      <span class="ref-repo__span rainbow-animation">Learn more ➔</span>
      <span class="ref-repo__logo fab fa-github rainbow-animation"></span>
    </a>
  </h3>

  <section class="calculator">
    <hr />
    <div>
      <p class="calculator__text">The inputs below help calculate a basic estimate of the amount of savings that can be gained by implementing and Continuous Integration (CI). It can be used to make a case for implementing CI 😍.</p>
    </div>
    <hr />
    <div data-tooltip="e.g. pts, hrs">
      <label class="calculator__label">Productivity Per Sprint:</label>
      <input type="number" id="sprint-productivity" class="calculator__input">
      <span class="calculator__unit" />
    </div>

    <div data-tooltip="e.g. pts, hrs">
      <label class="calculator__label">Productivity Spent on Integration without CI:</label>
      <input type="number" id="sprint-no-ci-productivity-cost" class="calculator__input">
      <span class="calculator__unit" />
    </div>
    <div data-tooltip="e.g. pts, hrs">
      <label class="calculator__label">Productivity Spent on Integration with CI:</label>
      <input type="number" id="sprint-ci-productivity-cost" class="calculator__input">
      <span class="calculator__unit" />
    </div>
    <div>
      <label class="calculator__label">Average Developer Salary:</label>
      <span class="calculator__unit__left">$</span>
      <input type="number" id="approx-average-developer-salary-value" class="calculator__input">
      <span class="calculator__unit">.00</span>
    </div>
    <div>
      <label class="calculator__label">Number of Developers:</label>
      <input type="number" id="number-of-developers" class="calculator__input">
      <span class="calculator__unit"></span>
    </div>
    <button id="submit-savings">Estimate Savings</button>
    <hr />
    <div>
      <span class="calculator__label">CI Savings:</span>
      <span id="result" class="calculator__result">$0</span> </div>
  </section>
</main>
              
            
!

CSS

              
                body {
  background: #f7eec9;
  color: #07448e;
}
button {
  border-radius: 2.5px;
  color: #f9c7e4;
  cursor: pointer;
  background: #07448e;
  display: block;
  font-size: 1.5rem;
  margin: 0;
  padding: 0.5rem 0;
  width: 100%;
}
div {
  display: flex;
  flex-direction: row;
  margin: 2rem 0;
}

h1 {
  font-size: 2rem;
  margin: 3rem auto;
  text-align: center;
  @media (min-width: 60rem) {
    max-width: 50rem;
    font-size: 4.5rem;
  }
}
hr {
  margin: 2rem 0;
}
.calculator {
  display: block;
  font-weight: bold;
  margin: 0 auto;
  max-width: calc(100vw - 2rem);
  @media (min-width: 50rem) {
    max-width: 30rem;
  }
  &__input {
    border: 1px solid #07448e;
    border-radius: 2.5px;
    outline: 0;
    padding: 5px;
  }
  &__label {
    flex: 2 0 0;
    margin-right: 0.5rem;
  }
  &__text {
    font-size: 1.25rem;
    font-weight: normal;
    line-height: 1.75;
  }
  &__unit {
    padding-left: 5px;
    min-width: 50px;
    font-weight: 100;
    &__left {
      padding-left: 0px;
      padding-right: 5px;
      font-weight: 100;
    }
  }
}

.ref-repo {
  display: block;
  text-align: center;
  &__span {
    font-size: 2rem;
    margin-right: 10px;
  }
  &__logo {
    font-size: 2.5rem;
  }
  &__link {
    text-decoration: none;

    &:visited {
      color: #07448e;
    }
  }
}

.rainbow-animation {
  background: linear-gradient(to right, crimson, pink, springgreen, yellow);
  background-size: 500% 250%;
  display: inline-block;
  animation: rainbow 4s ease-in-out infinite;
  background-clip: text;
  -webkit-background-clip: text;
  transition: color 0.4s ease-in-out;
}

.rainbow-animation:hover {
  color: rgba(0, 0, 0, 0);
}

@keyframes rainbow {
  0% {
    background-position: left;
  }
  50% {
    background-position: right;
  }
  100% {
    background-position: left;
  }
}

/* Base styles for the element that has a tooltip */
[data-tooltip],
.tooltip {
  position: relative;
  cursor: pointer;
}

/* Base styles for the entire tooltip */
[data-tooltip]:before,
[data-tooltip]:after,
.tooltip:before,
.tooltip:after {
  position: absolute;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.2s ease-in-out, visibility 0.2s ease-in-out,
    transform 0.2s cubic-bezier(0.71, 1.7, 0.77, 1.24);
  transform: translate3d(0, 0, 0);
  pointer-events: none;
}

[data-tooltip]:hover:before,
[data-tooltip]:hover:after,
[data-tooltip]:focus:before,
[data-tooltip]:focus:after,
.tooltip:hover:before,
.tooltip:hover:after,
.tooltip:focus:before,
.tooltip:focus:after {
  visibility: visible;
  opacity: 1;
}

.tooltip:before,
[data-tooltip]:before {
  z-index: 1001;
  border: 6px solid transparent;
  background: transparent;
  content: "";
}

/* Base styles for the tooltip's content area */
.tooltip:after,
[data-tooltip]:after {
  z-index: 1000;
  padding: 10px;
  border-radius: 5px;
  color: #f9c7e4;
  cursor: pointer;
  background: #07448e;
  content: attr(data-tooltip);
  line-height: 1.2;
}

/* Direction */
[data-tooltip]:before,
[data-tooltip]:after,
.tooltip:before,
.tooltip:after,
.tooltip-top:before,
.tooltip-top:after {
  bottom: 100%;
  left: 50%;
}

[data-tooltip]:before,
.tooltip:before,
.tooltip-top:before {
  margin-left: -6px;
  margin-bottom: -12px;
  border-top-color: #000;
  border-top-color: hsla(0, 0%, 20%, 0.9);
}

/* Horizontally align top/bottom tooltips */
[data-tooltip]:after,
.tooltip:after,
.tooltip-top:after {
  margin-left: -50px;
}

[data-tooltip]:hover:before,
[data-tooltip]:hover:after,
[data-tooltip]:focus:before,
[data-tooltip]:focus:after,
.tooltip:hover:before,
.tooltip:hover:after,
.tooltip:focus:before,
.tooltip:focus:after,
.tooltip-top:hover:before,
.tooltip-top:hover:after,
.tooltip-top:focus:before,
.tooltip-top:focus:after {
  -webkit-transform: translateY(-12px);
  -moz-transform: translateY(-12px);
  transform: translateY(-12px);
}

              
            
!

JS

              
                
const button = document.getElementById('submit-savings');
const result = document.getElementById('result');
const elValue = (id) => parseInt(document.getElementById(id).value);

/**
  * Tooltip code
  */
const anyInput = [...document.querySelectorAll('.calculator__input')];
const hideToolTip = () => {};
anyInput.forEach(el => {
  if (el) return el.addEventListener('blur', hideToolTip, false)
});

/**
  * Modal code
  */
const displayModal = (errMsg) => {
  const modal = document.createElement('div');
  modal.classList.add = 'modal';
  modal.id = 'modal'
  const modalText = `
      <button id="modal-button" class="modal__close">x</button>
    </div>`
  modal.textContent = modalText;
  document.body.appendChild(modal);
  document.getElementById('modal-button').addEventListener(
    'click', 
    document.getElementById('modal').remove(), 
    false
  );
};

const getEstimatedSavingsWithCI = () => {
  const productivity = elValue('sprint-productivity');
  const productivityNoCiCost = elValue('sprint-no-ci-productivity-cost');
  const productivityCiCost = elValue('sprint-ci-productivity-cost');
  const approxDevAvgSalary = elValue('approx-average-developer-salary-value');
  const numberOfDevelopers = elValue('number-of-developers');
  if (
    !productivity || 
    !productivityNoCiCost || 
    !productivityCiCost || 
    !approxDevAvgSalary || 
    !numberOfDevelopers
  ) return alert('All inputs must be filled out');
  if (
    productivity <= productivityNoCiCost ||  
    productivity <= productivityCiCost
  ) return alert('Productivity should be greater than Productivity Spent on Integration');
  if (
    productivityNoCiCost <= productivityCiCost
  ) return alert('Productivity should be better with CI');
  const productivitySpentOnCIWithoutCI = productivityNoCiCost / productivity;
  const productivitySpentOnCIWithCI = productivityCiCost / productivity;
  const lostProductivityWithCI = productivitySpentOnCIWithoutCI - productivitySpentOnCIWithCI;
  const costOfNotHavingCI = (approxDevAvgSalary * lostProductivityWithCI) * numberOfDevelopers;
  result.textContent = `$${costOfNotHavingCI.toFixed(2)}`;
}
button.addEventListener('click', getEstimatedSavingsWithCI)

              
            
!
999px

Console