valk/search.html

## search.html
<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <title>Search</title>
  <style>
    body { margin: 0; box-sizing: border-box; }
    .header { width: 100%; height: 36px; background: #DAE3ED; padding: 14px; color: #111; }
    .search { margin: 0 40px; }
    .search__input { height: 26px; width: 40%; border-radius: 4px; padding: 4px 8px;
      font: 18px/22px Arial, Helvetica, sans-serif; border: 1px solid #bebebe; }
    .search__input:focus { border: 1px solid #00f; }
    .search__results { margin: 10px 0 0; width: 650px; background: #fff; box-shadow: 0 0 13px #d0d0d0; padding: 14px; }
    .search__hidden { display: none; }
    .search__section-content { display: flex; flex-direction: column; flex-wrap: wrap; align-items: baseline;
      align-content: space-between; height: 210px; margin: 0 0 20px; }
    .search__section-title { display: block; margin: 10px 0; color: #36526C;
      font: bold 16px/22px Arial, Helvetica, sans-serif; }
    .card { display: inline-block; width: 290px; height: 50px; overflow: hidden; margin: 10px; }
    .card__image { float: left; width: 50px; height: 50px; margin: 0 20px 0 0; }
    .card__text { color: #36526C; font: 18px/22px Arial, Helvetica, sans-serif; }
  </style>

  <script>
    'use strict';

    (function(doc) {
      const items = [
        { id: 1, image: "https://images.folloze.com/image/upload/v1450949154/folloze-image-gallery/campaign/heroimage01.png", title: "Space Mobile The Final Frontier" },
        { id: 2, image: "https://images.folloze.com/image/upload/v1450949153/folloze-image-gallery/campaign/heroimage13.png", title: "What if They Let You Run The Hubble Mobile" },
        { id: 3, image: "https://images.folloze.com/image/upload/v1450949153/folloze-image-gallery/campaign/heroimage04.png", title: "Shooting Stars Mobile" },
        { id: 4, image: "https://images.folloze.com/image/upload/v1450949149/folloze-image-gallery/campaign/heroimage11.png", title: "Make Money Online Through Advertising" },
        { id: 5, image: "https://images.folloze.com/image/upload/v1450949143/folloze-image-gallery/campaign/heroimage08.png", title: "What Makes Flyers Unrivaled" },
        { id: 6, image: "https://images.folloze.com/image/upload/v1450948643/folloze-image-gallery/campaign/heroimage05.png", title: "Adwords Keywork Research For Beginners" }
      ]

      const boards = [
        { id: 1, image: "https://images.folloze.com/image/upload/v1458832608/folloze-image-gallery/customer/customer_03.png", title: "The Baiscs Of Buying A Telescope Mobile" },
        { id: 2, image: "https://images.folloze.com/image/upload/v1450949395/folloze-image-gallery/customer/customer_02.png", title: "The Universe Through A Child Eyes Mobile" },
        { id: 3, image: "https://images.folloze.com/image/upload/v1450949032/folloze-image-gallery/customer/customer_04.png", title: "Home Business Advertising Ideas Mobile" },
        { id: 4, image: "https://images.folloze.com/image/upload/v1450949131/folloze-image-gallery/group/group_01.png", title: "Finally A Top Mobile Way You Can Google Adwords Pay Per Clicks" },
        { id: 5, image: "https://images.folloze.com/image/upload/v1450949052/folloze-image-gallery/group/group_02.png", title: "Study 800 Numbers Still Popula With Advertisers Mobile" },
        { id: 6, image: "https://images.folloze.com/image/upload/v1450948179/folloze-image-gallery/generic/generic_06.png", title: "Using Banner Stands To Increase Trade Show Traffic" }
      ]

      // This is a generic search structure with a simple substring search.
      //
      function Search(data) {
        // Prepare lowercaseTitles for faster search
        this.data = data.map(function(item) {
          item.lowercaseTitle = item.title.toLowerCase();
          return item;
        });

        // This actually does the search. And it memoizes the results in a hash, so the callers
        //  won't worry about performance
        this.containing = function(substr) {
          substr = substr.trim();
          this.containingMemo = this.containingMemo || {};
          // Note, for better performance we'll limit this memo to say 100, and will add appropriate code
          //  omitting that because it's not relevant for this test.
          if (this.containingMemo[substr]) {
            return this.containingMemo[substr];
          }

          if (!substr || substr === '') {
            return this.data;
          }

          this.containingMemo[substr] = this.data.filter(function(item) {
            return item.lowercaseTitle.indexOf(substr.toLowerCase()) > -1;
          });

          return this.containingMemo[substr];
        }

        this.countResults = function(substr) {
          substr = substr.trim();
          return this.containing(substr).length;
        }

        this.buildSearchResults = function(substr) {
          substr = substr.trim();
          const items = this.containing(substr);
          let itemsHTML = '';
          items.forEach(function (itemObj) {
            itemsHTML +=
                    '<div class="card" data-item-id="' + itemObj.id + '">' +
                    '  <img class="card__image" src="' + itemObj.image + '" />' +
                    '  <div class="card__text js-card-text">' +
                    itemObj.title +
                    '  </div>' +
                    '</div>';
          });
          return itemsHTML;
        }
      }

      function limitTextH(sEls, maxHeight) {
        sEls.forEach(function (p) {
          let text = p.textContent,
                  textLen = text.length;
          while (textLen-- && p.offsetHeight > maxHeight) {
            p.textContent = text.substring(0, textLen) + '…';
          }
        });
      }

      function toggleSearchResultsVisibility(substr) {
        const sResults = document.querySelector('.search__results');
        if (!substr || substr.trim() === '') {
          sResults.classList.add('search__hidden');
          return;
        }
        sResults.classList.remove('search__hidden');
      }

      // Using DOMContentLoaded because the test question said to write the code here. Otherwise it'd
      // wiser in this case just to add the script after HTML without the event.
      //
      doc.addEventListener("DOMContentLoaded", function() {
        const itemsSearch = new Search(items);
        const boardsSearch = new Search(boards);

        // Listen to key presses and render the searched results
        const sSearchInput = document.querySelector('.search__input');

        function updateSearchResults(input) {
          const sSections = doc.querySelector('.js-content-items');
          const sBoards = doc.querySelector('.js-content-boards');
          const sTitleItems = doc.querySelector('.js-results-title-items');
          const sTitleBoards = doc.querySelector('.js-results-title-boards');

          toggleSearchResultsVisibility(input);

          // Note, innerHTML is slower but trades faster code delivery
          sSections.innerHTML = itemsSearch.buildSearchResults(input);
          sTitleItems.innerHTML = "Items (" + itemsSearch.countResults(input) + ')';
          sBoards.innerHTML = boardsSearch.buildSearchResults(input);
          sTitleBoards.innerHTML = "Boards (" + boardsSearch.countResults(input) + ')';

          const sItems = document.querySelectorAll('.js-card-text');
          limitTextH(sItems, 64);
        }

        sSearchInput.addEventListener('keyup', function(e) {
          const input = e.currentTarget.value;
          updateSearchResults(input);
        });
      });

      // Ok, at this point of time I'm pretty much happy with this code.
      // Minor things I'd improve, but just don't see any motivation right now:
      //   * Make the search self-contained, means when we do new Search(..) we'd pass there also the selectors,
      //     and move into Search class the methods like toggleSearchResultsVisibility() and limitTextH(), in order
      //     to create reusable objects independent from the surrounding code.
      //   * Make the search results collapse heights when there are fewer items
      //   * Maybe reduce the whole section entirely where theres (0) results
      //   * Do something with the huge images to reduce the download bandwidth
      //   * Write tests (I manually tested on recent Chrome and FF browsers)
      // But overall it's just time VS quality as usual.
    }(document));
  </script>
</head>

<body>
<div class="header">
  <div class="search">
    <input class="search__input" type="text" placeholder="Type & joy..." />
    <div class="search__results search__hidden">
      <div class="search__section search__section--items">
        <strong class="search__section-title js-results-title-items">Items ()</strong>
        <div class="search__section-content js-content-items"></div>
      </div>
      <div class="search__section search__section--boards">
        <strong class="search__section-title js-results-title-boards">Boards ()</strong>
        <div class="search__section-content js-content-boards"></div>
      </div>
    </div>
  </div>
</div>

</body>

</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>Search</title>
	<style>
	body { margin: 0; box-sizing: border-box; }
	.header { width: 100%; height: 36px; background: #DAE3ED; padding: 14px; color: #111; }
	.search { margin: 0 40px; }
	.search__input { height: 26px; width: 40%; border-radius: 4px; padding: 4px 8px;
	font: 18px/22px Arial, Helvetica, sans-serif; border: 1px solid #bebebe; }
	.search__input:focus { border: 1px solid #00f; }
	.search__results { margin: 10px 0 0; width: 650px; background: #fff; box-shadow: 0 0 13px #d0d0d0; padding: 14px; }
	.search__hidden { display: none; }
	.search__section-content { display: flex; flex-direction: column; flex-wrap: wrap; align-items: baseline;
	align-content: space-between; height: 210px; margin: 0 0 20px; }
	.search__section-title { display: block; margin: 10px 0; color: #36526C;
	font: bold 16px/22px Arial, Helvetica, sans-serif; }
	.card { display: inline-block; width: 290px; height: 50px; overflow: hidden; margin: 10px; }
	.card__image { float: left; width: 50px; height: 50px; margin: 0 20px 0 0; }
	.card__text { color: #36526C; font: 18px/22px Arial, Helvetica, sans-serif; }
	</style>

	<script>
	'use strict';

	(function(doc) {
	const items = [
	{ id: 1, image: "https://images.folloze.com/image/upload/v1450949154/folloze-image-gallery/campaign/heroimage01.png", title: "Space Mobile The Final Frontier" },
	{ id: 2, image: "https://images.folloze.com/image/upload/v1450949153/folloze-image-gallery/campaign/heroimage13.png", title: "What if They Let You Run The Hubble Mobile" },
	{ id: 3, image: "https://images.folloze.com/image/upload/v1450949153/folloze-image-gallery/campaign/heroimage04.png", title: "Shooting Stars Mobile" },
	{ id: 4, image: "https://images.folloze.com/image/upload/v1450949149/folloze-image-gallery/campaign/heroimage11.png", title: "Make Money Online Through Advertising" },
	{ id: 5, image: "https://images.folloze.com/image/upload/v1450949143/folloze-image-gallery/campaign/heroimage08.png", title: "What Makes Flyers Unrivaled" },
	{ id: 6, image: "https://images.folloze.com/image/upload/v1450948643/folloze-image-gallery/campaign/heroimage05.png", title: "Adwords Keywork Research For Beginners" }
	]

	const boards = [
	{ id: 1, image: "https://images.folloze.com/image/upload/v1458832608/folloze-image-gallery/customer/customer_03.png", title: "The Baiscs Of Buying A Telescope Mobile" },
	{ id: 2, image: "https://images.folloze.com/image/upload/v1450949395/folloze-image-gallery/customer/customer_02.png", title: "The Universe Through A Child Eyes Mobile" },
	{ id: 3, image: "https://images.folloze.com/image/upload/v1450949032/folloze-image-gallery/customer/customer_04.png", title: "Home Business Advertising Ideas Mobile" },
	{ id: 4, image: "https://images.folloze.com/image/upload/v1450949131/folloze-image-gallery/group/group_01.png", title: "Finally A Top Mobile Way You Can Google Adwords Pay Per Clicks" },
	{ id: 5, image: "https://images.folloze.com/image/upload/v1450949052/folloze-image-gallery/group/group_02.png", title: "Study 800 Numbers Still Popula With Advertisers Mobile" },
	{ id: 6, image: "https://images.folloze.com/image/upload/v1450948179/folloze-image-gallery/generic/generic_06.png", title: "Using Banner Stands To Increase Trade Show Traffic" }
	]

	// This is a generic search structure with a simple substring search.
	//
	function Search(data) {
	// Prepare lowercaseTitles for faster search
	this.data = data.map(function(item) {
	item.lowercaseTitle = item.title.toLowerCase();
	return item;
	});

	// This actually does the search. And it memoizes the results in a hash, so the callers
	// won't worry about performance
	this.containing = function(substr) {
	substr = substr.trim();
	this.containingMemo = this.containingMemo \|\| {};
	// Note, for better performance we'll limit this memo to say 100, and will add appropriate code
	// omitting that because it's not relevant for this test.
	if (this.containingMemo[substr]) {
	return this.containingMemo[substr];
	}

	if (!substr \|\| substr === '') {
	return this.data;
	}

	this.containingMemo[substr] = this.data.filter(function(item) {
	return item.lowercaseTitle.indexOf(substr.toLowerCase()) > -1;
	});

	return this.containingMemo[substr];
	}

	this.countResults = function(substr) {
	substr = substr.trim();
	return this.containing(substr).length;
	}

	this.buildSearchResults = function(substr) {
	substr = substr.trim();
	const items = this.containing(substr);
	let itemsHTML = '';
	items.forEach(function (itemObj) {
	itemsHTML +=
	'<div class="card" data-item-id="' + itemObj.id + '">' +
	' <img class="card__image" src="' + itemObj.image + '" />' +
	' <div class="card__text js-card-text">' +
	itemObj.title +
	' </div>' +
	'</div>';
	});
	return itemsHTML;
	}
	}

	function limitTextH(sEls, maxHeight) {
	sEls.forEach(function (p) {
	let text = p.textContent,
	textLen = text.length;
	while (textLen-- && p.offsetHeight > maxHeight) {
	p.textContent = text.substring(0, textLen) + '…';
	}
	});
	}

	function toggleSearchResultsVisibility(substr) {
	const sResults = document.querySelector('.search__results');
	if (!substr \|\| substr.trim() === '') {
	sResults.classList.add('search__hidden');
	return;
	}
	sResults.classList.remove('search__hidden');
	}

	// Using DOMContentLoaded because the test question said to write the code here. Otherwise it'd
	// wiser in this case just to add the script after HTML without the event.
	//
	doc.addEventListener("DOMContentLoaded", function() {
	const itemsSearch = new Search(items);
	const boardsSearch = new Search(boards);

	// Listen to key presses and render the searched results
	const sSearchInput = document.querySelector('.search__input');

	function updateSearchResults(input) {
	const sSections = doc.querySelector('.js-content-items');
	const sBoards = doc.querySelector('.js-content-boards');
	const sTitleItems = doc.querySelector('.js-results-title-items');
	const sTitleBoards = doc.querySelector('.js-results-title-boards');

	toggleSearchResultsVisibility(input);

	// Note, innerHTML is slower but trades faster code delivery
	sSections.innerHTML = itemsSearch.buildSearchResults(input);
	sTitleItems.innerHTML = "Items (" + itemsSearch.countResults(input) + ')';
	sBoards.innerHTML = boardsSearch.buildSearchResults(input);
	sTitleBoards.innerHTML = "Boards (" + boardsSearch.countResults(input) + ')';

	const sItems = document.querySelectorAll('.js-card-text');
	limitTextH(sItems, 64);
	}

	sSearchInput.addEventListener('keyup', function(e) {
	const input = e.currentTarget.value;
	updateSearchResults(input);
	});
	});

	// Ok, at this point of time I'm pretty much happy with this code.
	// Minor things I'd improve, but just don't see any motivation right now:
	// * Make the search self-contained, means when we do new Search(..) we'd pass there also the selectors,
	// and move into Search class the methods like toggleSearchResultsVisibility() and limitTextH(), in order
	// to create reusable objects independent from the surrounding code.
	// * Make the search results collapse heights when there are fewer items
	// * Maybe reduce the whole section entirely where theres (0) results
	// * Do something with the huge images to reduce the download bandwidth
	// * Write tests (I manually tested on recent Chrome and FF browsers)
	// But overall it's just time VS quality as usual.
	}(document));
	</script>
	</head>

	<body>
	<div class="header">
	<div class="search">
	<input class="search__input" type="text" placeholder="Type & joy..." />
	<div class="search__results search__hidden">
	<div class="search__section search__section--items">
	<strong class="search__section-title js-results-title-items">Items ()</strong>
	<div class="search__section-content js-content-items"></div>
	</div>
	<div class="search__section search__section--boards">
	<strong class="search__section-title js-results-title-boards">Boards ()</strong>
	<div class="search__section-content js-content-boards"></div>
	</div>
	</div>
	</div>
	</div>

	</body>

	</html>