Modal Popup with Login/Register Forms!

index.html

<nav>
  <h1>Website Title</h1>
  <ul>
    <li class="active">Home</li>
    <li>About</li>
    <li>Contact Form</li>
  </ul>
  <div class="underline"></div>
</nav>
<div class="container">
  <button>Click Here</button>
</div>
<div class="overlay">
</div>
<div class="main-popup">
  <div class="popup-header">
    <div id="popup-close-button"><a href="#"></a></div>
    <ul>
      <li><a href="#" id="sign-in">Sign In</a></li>
      <li><a href="#" id="register">Register</a></li>
    </ul>
  </div><!--.popup-header-->
  <div class="popup-content">
    <form action="#" class="sign-in">
      <label for="email">Email:</label>
      <input type="text" id="email">
      <label for="password">Password:</label>
      <input type="password" id="password">
      <p class="check-mark">
        <input type="checkbox" id="remember-me">
        <label for="remember-me">Remember me</label>
      </p>
      <input type="submit" id="submit" value="Submit">
    </form>
   
    <form action="#" class="register">
      <label for="email-register">Email:</label>
      <input type="text" id="email-register">
      <label for="password-register">Password:</label>
      <input type="password" id="password-register">
      <label for="password-confirmation">Confirm Password:</label>
      <input type="password-confirmation" id="password-confirmation">
      <p class="check-mark">
        <input type="checkbox" id="accept-terms">
        <label for="accept-terms">I agree to the <a href="#">Terms</a></label>
      </p>
      <input type="submit" id="submit" value="Create Account">
    </form>
  </div><!--.popup-content-->
</div><!--.main-popup-->

<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>

modal-popup-with-login-register-forms.markdown

Modal Popup with Login/Register Forms!

Cool Modal Popup animation with login and register forms

A Pen by Chris on CodePen.

License.

script.js

/*Title: Cool Modal Popup Sign In/Out Form*/

$(function() {
  //defining all needed variables
  var $overlay = $('.overlay');
  var $mainPopUp = $('.main-popup')
  var $signIn = $('#sign-in');
  var $register = $('#register');
  var $formSignIn = $('form.sign-in');
  var $formRegister = $('form.register');
  
  var $firstChild = $('nav ul li:first-child');
  var $secondChild = $('nav ul li:nth-child(2)');
  var $thirdChild = $('nav ul li:nth-child(3)');
  
  //defining function to create underline initial state on document load
  function initialState() {
    $('.underline').css({
      "width": $firstChild.width(),
      "left": $firstChild.position().left,
      "top": $firstChild.position().top + $firstChild.outerHeight(true) + 'px'
    });
  }
  initialState(); //() used after calling function to call function immediately on doc load
  
  //defining function to change underline depending on which li is active
  function changeUnderline(el) {
    $('.underline').css({
      "width": el.width(),
      "left": el.position().left,
      "top": el.position().top + el.outerHeight(true) + 'px'
    });
  } //note: have not called the function...don't want it called immediately
  
  $firstChild.on('click', function(){
    var el = $firstChild;
    changeUnderline(el); //call the changeUnderline function with el as the perameter within the called function
    $secondChild.removeClass('active');
    $thirdChild.removeClass('active');
    $(this).addClass('active');
  });
  
  $secondChild.on('click', function(){
    var el = $secondChild;
    changeUnderline(el); //call the changeUnderline function with el as the perameter within the called function
    $firstChild.removeClass('active');
    $thirdChild.removeClass('active');
    $(this).addClass('active');
  });
  
  $thirdChild.on('click', function(){
    var el = $thirdChild;
    changeUnderline(el); //call the changeUnderline function with el as the perameter within the called function
    $firstChild.removeClass('active');
    $secondChild.removeClass('active');
    $(this).addClass('active');
  });
  
  
  $('button').on('click', function(){
    $overlay.addClass('visible');
    $mainPopUp.addClass('visible');
    $signIn.addClass('active');
    $register.removeClass('active');
    $formRegister.removeClass('move-left');
    $formSignIn.removeClass('move-left');
  });
  $overlay.on('click', function(){
    $(this).removeClass('visible');
    $mainPopUp.removeClass('visible');
  });
  $('#popup-close-button a').on('click', function(e){
    e.preventDefault();
    $overlay.removeClass('visible');
    $mainPopUp.removeClass('visible');
  });
  
  $signIn.on('click', function(){
    $signIn.addClass('active');
    $register.removeClass('active');
    $formSignIn.removeClass('move-left');
    $formRegister.removeClass('move-left');
  });
  
  $register.on('click', function(){
    $signIn.removeClass('active');
    $register.addClass('active');
    $formSignIn.addClass('move-left');
    $formRegister.addClass('move-left');
  });
  
  $('input').on('submit', function(e){
    e.preventDefault(); //used to prevent submission of form...remove for real use
  });
});

style.css

html, body, * {
  box-sizing: border-box;
}

nav {
  height: 60px;
}

nav h1 {
  float: left;
  margin: 10px 0 0 30px;
  font-size: 2em;
}

nav ul {
  float: right;
}

nav ul li {
  display: inline-block;
  list-style: none;
  margin: 0 0 3px 0;
  padding-right: 10px;
  cursor: pointer;
  color: #ccc;
  transition: all 0.5s ease;
}

nav ul li:hover {
  color: #000;
}

nav ul li:last-child {
  margin-right: 20px;
}

nav ul li.active {
  color: #000;
}

.underline {
  position: absolute;
  height: 4px;
  background-color: #ceaee8;
  transition: all 0.5s ease;
}

.container {
  width: 100%;
  height: 100vh;
  background-color: #e7e7f6;
  border-radius: 5px;
  z-index: 2;
}

button {
  position: relative;
  left: 50%;
  top: 50%;
  height: 70px;
  width: 200px;
  margin: -35px 0 0 -100px;
  padding: 15px 30px;
  border-radius: 5px;
  background-color: #ceaee8;
  color: #fff;
  font-size: 1.5em;
  cursor: pointer;
  -webkit-transition: all 0.5s ease;
    -moz-transition: all 0.5s ease;
    -o-transition: all 0.5s ease;
    transition: all 0.5s ease;
  outline: none;
}

button:hover {
  opacity 0.8;
  box-shadow: 0 2px 5px #9a9a9a;
}

.overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: all .5s ease;
}

.overlay.visible {
  opacity: 1;
  visibility: visible;
}

.main-popup {
  position: fixed;
  left: 0;
  top: 30px;
  margin: 0;
  width: 100%;
  height: 450px;
  background-color: #e7e7f6;
  border-radius: 5px;
  z-index: 15;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: all .5s ease;
  /*overflow: hidden;*/
}

.main-popup.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(10px);
  transition: all .5s ease;
}

@media (min-width: 500px) {
  .main-popup {
    width: 500px;
    left: 50%;
    margin: 0 0 0 -250px;
  }
}

.popup-header {
  position: relative;
  padding: 0;
  margin: 0;
  height: 62px;
  width: 100%;
}

#popup-close-button a {
  position: absolute;
  right: 10px;
  top: -30px;
  width: 22px;
  height: 22px;
}

#popup-close-button a::before {
  content: '';
  position: absolute;
  right: 10px;
  top: 0;
  width: 3px;
  height: 25px;
  background-color: #fff;
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}

#popup-close-button a::after {
  content: '';
  position: absolute;
  right: 10px;
  top: 0;
  width: 3px;
  height: 25px;
  background-color: #fff;
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

.popup-header ul {
  margin: 0;
  padding: 0;
}

.popup-header ul li {
  text-align: center;
  list-style: none;
  width: 50%;
  float: left;
}

.popup-header ul li a {
  display: block;
  padding: 20px 0;
  margin: 0;
  text-decoration: none;
  font-size: 1.2em;
}

#sign-in {
  background-color: #ceaee8;
  color: #fff;
  border-radius: 5px 0 0 0;
}

#sign-in.active {
  color: #ceaee8;
  background-color: transparent;
}

#register {
  background-color: #ceaee8;
  color: #fff;
  border-radius: 0 5px 0 0;
}

#register.active {
  color: #ceaee8;
  background-color: transparent;
}

.popup-content {
  height: 400px;
  overflow: hidden;
}

form.sign-in {
  position: relative; 
  top: 40px;
  left: 0;
  font-size: 1em;
  opacity: 1;
  -webkit-transition: all .35s;
  -moz-transition: all .35s;
  -o-transition: all .35s;
  transition: all .35s;
}

form.sign-in.move-left {
  opacity: 0;
  transform: translateX(-450px);
}

form label {
  font-size: 1.1em;
  color: #ceaee8;
  margin-left: 23px;
}

form.sign-in input {
  border-radius: 5px;
  width: 90%;
  height: 40px;
  margin: 5px 5% 30px 5%;
  padding: 10px;
  font-size: 1em;
  color: #ceaee8;
  outline: none;
  border: none;
}

input#submit {
  background-color: #ceaee8;
  color: #fff;
  height: 50px;
  width: 90%;
  margin-left: 5%;
  margin-right: 5%;
  margin-top: 25px;
  padding: 0;
  cursor: pointer;
  outline: none;
  border-radius: 5px;
  font-size: 1em;
  border: none;
}

form.register {
  position: relative; 
  top: -280px;
  left: 0;
  font-size: 1em;
  opacity: 0;
  transform: translateX(450px);
  -webkit-transition: all .35s;
  -moz-transition: all .35s;
  -o-transition: all .35s;
  transition: all .35s;
}

form.register.move-left {
  opacity: 1;
  transform: translateX(0);
}

form.register input {
  border-radius: 5px;
  width: 90%;
  height: 40px;
  margin: 5px 5% 15px 5%;
  padding: 10px;
  font-size: 1em;
  color: #ceaee8;
  outline: none;
  border: none;
}

p.check-mark {
  position: relative;
  left: 50%;
  width: 200px;
  margin: 0 0 0 -100px;
  padding: 0;
  text-align: center;
  color: #ceaee8;
  font-size: .8em;
}

p.check-mark a {
  color: #a48bb9;
}

p.check-mark input {
  border-radius: 0;
  width: auto;
  height: auto;
  margin: 0;
  padding: 0;
  font-size: 2em;
  color: #ceaee8;
  outline: none;
  border: none;
}

p.check-mark label {
  margin-left: 5px;
}