Fullscreen Morphing Search Field With JavaScript And CSS3

Makes use of JavaScript and CSS3 to create a search icon that morphs into a fullscreen search field when clicked on. Based on CSS3 transitions and transforms.

How to use it:

Create the search field.

<div class="scroll-cont">
  <div class="content">
    <div class="search">
      <div class="search__bg"></div>
      <div class="search__box">
        <input type="text" class="search__input" placeholder="Search"/>
        <div class="search__line"></div>
        <div class="search__close"></div>
      </div>
    </div>
  </div>
</div>

Create a fullscreen overlay for the search field.

<div class="search-overlay"></div>

The CSS styles for the search field.

.search {
  position: relative;
  margin: 0 auto 50px;
  width: 116px;
  height: 116px;
  -webkit-perspective: 1000px;
  perspective: 1000px;
}
.search:not(.s--active) { cursor: pointer; }
.search.s--hidden { opacity: 0; }
.search.s--cloned {
  position: absolute;
  left: 50%;
  top: 50%;
  right: auto;
  bottom: auto;
  margin-left: -58px;
  margin-top: -58px;
  margin-right: 0;
  margin-bottom: 0;
}
.search.s--moving {
  -webkit-transition: -webkit-transform 0.4s cubic-bezier(0.56, -0.49, 0.58, 0.9);
  transition: -webkit-transform 0.4s cubic-bezier(0.56, -0.49, 0.58, 0.9);
  transition: transform 0.4s cubic-bezier(0.56, -0.49, 0.58, 0.9);
  transition: transform 0.4s cubic-bezier(0.56, -0.49, 0.58, 0.9), -webkit-transform 0.4s cubic-bezier(0.56, -0.49, 0.58, 0.9);
}
.search__bg {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: #F63;
  -webkit-transition: all 0.6s ease;
  transition: all 0.6s ease;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}
.search.s--active .search__bg {
  -webkit-transform: translate3d(-50%, -50%, 0) scale(48);
  transform: translate3d(-50%, -50%, 0) scale(48);
}
.search__box {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 50px;
  height: 50px;
  border: 4px solid #fff;
  border-radius: 25px;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  -webkit-transition: all 0.45s ease;
  transition: all 0.45s ease;
}
.search.s--active .search__box {
  width: 510px;
  height: 100px;
  border-radius: 50px;
}
.search__input {
  width: 100%;
  height: 100%;
  background: transparent;
  border: none;
  outline: none;
  pointer-events: none;
  opacity: 0;
  color: #fff;
  font-size: 40px;
  -webkit-transition: opacity 0s;
  transition: opacity 0s;
}
.search__input::-webkit-input-placeholder {
 color: rgba(255, 255, 255, 0.4);
}
.search__input::-moz-placeholder {
 color: rgba(255, 255, 255, 0.4);
}
.search__input:-ms-input-placeholder {
 color: rgba(255, 255, 255, 0.4);
}
.search__input::placeholder {
 color: rgba(255, 255, 255, 0.4);
}
.search.s--active .search__input {
  padding: 23px 90px 23px 40px;
  pointer-events: auto;
  opacity: 1;
  -webkit-transition: opacity 0.18s 0.48s;
  transition: opacity 0.18s 0.48s;
}
.search__line {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 4px;
  border-radius: 2px;
  background: #fff;
  -webkit-transform-origin: 0 50%;
  transform-origin: 0 50%;
  -webkit-transform: translate(14px, 14px) rotate(45deg);
  transform: translate(14px, 14px) rotate(45deg);
  -webkit-transition: all 0.48s;
  transition: all 0.48s;
}
.search__line:before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: inherit;
  height: inherit;
  background: inherit;
  border-radius: inherit;
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
  opacity: 0;
  -webkit-transition: opacity 0.3s;
  transition: opacity 0.3s;
}
.search.s--active .search__line:before {
  opacity: 1;
  -webkit-transition: opacity 0.3s 0.42s;
  transition: opacity 0.3s 0.42s;
}
.search.s--active .search__line {
  width: 36px;
  height: 6px;
  -webkit-transform: translate(180px, 11px) rotate(-45deg);
  transform: translate(180px, 11px) rotate(-45deg);
}
.search__close {
  position: absolute;
  right: 0;
  top: 0;
  width: 30px;
  height: 30px;
  pointer-events: none;
}
.search.s--active .search__close {
  right: 44px;
  top: 33px;
  pointer-events: auto;
  cursor: pointer;
}

The required CSS styles for the overlay.

.search-overlay {
  z-index: -1000;
  overflow: hidden;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.search-overlay.s--active { z-index: 9999; }

The core JavaScript.

(function() {
  var $searchOverlay = document.querySelector(".search-overlay");
  var $search = document.querySelector(".search");
  var $clone, offsetX, offsetY;
  $search.addEventListener("click", function() {
    var $original = this;
    $clone = this.cloneNode(true);
    $searchOverlay.classList.add("s--active");
    $clone.classList.add("s--cloned", "s--hidden");
    $searchOverlay.appendChild($clone);
    var triggerLayout = $searchOverlay.offsetTop;
    var originalRect = $original.getBoundingClientRect();
    var cloneRect = $clone.getBoundingClientRect();
    offsetX = originalRect.left - cloneRect.left;
    offsetY = originalRect.top - cloneRect.top;
    $clone.style.transform = "translate("+ offsetX +"px, "+ offsetY +"px)";
    $original.classList.add("s--hidden");
    $clone.classList.remove("s--hidden");
    var triggerLayout = $searchOverlay.offsetTop;
    $clone.classList.add("s--moving");
    $clone.setAttribute("style", "");
    $clone.addEventListener("transitionend", openAfterMove);
  });
  function openAfterMove() {
    $clone.classList.add("s--active");
    $clone.querySelector("input").focus();
    addCloseHandler($clone);
    $clone.removeEventListener("transitionend", openAfterMove);
  };
  
  function addCloseHandler($parent) {
    var $closeBtn = $parent.querySelector(".search__close");
    $closeBtn.addEventListener("click", closeHandler);
  };
  /* close handler functions */
  function closeHandler(e) {
    $clone.classList.remove("s--active");
    e.stopPropagation();
    
    var $cloneBg = $clone.querySelector(".search__bg");
    $cloneBg.addEventListener("transitionend", moveAfterClose);
  };
  
  function moveAfterClose(e) {
    e.stopPropagation(); // prevents from double transitionend even fire on parent $clone
    
    $clone.classList.add("s--moving");
    $clone.style.transform = "translate("+ offsetX +"px, "+ offsetY +"px)";
    $clone.addEventListener("transitionend", terminateSearch);
  };
  
  function terminateSearch(e) {
    $search.classList.remove("s--hidden");
    $clone.remove();
    $searchOverlay.classList.remove("s--active");
  };
}());