如何創建：帶過濾功能的作品集畫廊

學習如何創建帶篩選功能的作品集畫廊。

如何創建作品集網站

第一步 - 添加 HTML：

<h2>PORTFOLIO</h2>
<div id="myBtnContainer">
  <button class="btn active" onclick="filterSelection('all')"> Show all</button>
  <button class="btn" onclick="filterSelection('nature')"> Nature</button>
  <button class="btn" onclick="filterSelection('cars')"> Cars</button>
  <button class="btn" onclick="filterSelection('people')"> People</button>
</div>
<!-- 作品集畫廊網格 -->
<div class="row">
  <div class="column nature">
    <div class="content">
      <img src="/w3images/mountains.jpg" alt="Mountains" style="width:100%">
      <h4>Mountains</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column nature">
    <div class="content">
      <img src="/w3images/lights.jpg" alt="Lights" style="width:100%">
      <h4>Lights</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column nature">
    <div class="content">
      <img src="/w3images/nature.jpg" alt="Nature" style="width:100%">
      <h4>Forest</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column cars">
    <div class="content">
      <img src="/w3images/cars1.jpg" alt="Car" style="width:100%">
      <h4>Retro</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column cars">
    <div class="content">
      <img src="/w3images/cars2.jpg" alt="Car" style="width:100%">
      <h4>Fast</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column cars">
    <div class="content">
      <img src="/w3images/cars3.jpg" alt="Car" style="width:100%">
      <h4>Classic</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column people">
    <div class="content">
      <img src="/w3images/people1.jpg" alt="People" style="width:100%">
      <h4>Girl</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column people">
    <div class="content">
      <img src="/w3images/people2.jpg" alt="People" style="width:100%">
      <h4>Man</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
  <div class="column people">
    <div class="content">
      <img src="/w3images/people3.jpg" alt="People" style="width:100%">
      <h4>Woman</h4>
      <p>Lorem ipsum dolor..</p>
    </div>
  </div>
<!-- 結束網格 -->
</div>

第二步 - 添加 CSS：

* {
  box-sizing: border-box;
}
body {
  background-color: #f1f1f1;
  padding: 20px;
  font-family: Arial;
}
/* 居中網站 */
.main {
  max-width: 1000px;
  margin: auto;
}
h1 {
  font-size: 50px;
  word-break: break-all;
}
.row {
  margin: 8px -16px;
}
/* 在每列之間添加內邊距（如果需要） */
.row,
.row > .column {
  padding: 8px;
}
/* 創建三個彼此相鄰的等寬列 */
.column {
  float: left;
  width: 33.33%;
  display: none; /* 默認隱藏列 */
}
/* 清除行后的浮動 */
.row:after {
  content: "";
  display: table;
  clear: both;
}
/* 內容 */
.content {
  background-color: white;
  padding: 10px;
}
/* "show" 類被添加到被過濾的元素中 */
.show {
  display: block;
}
/* 設置按鈕的樣式 */
.btn {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: white;
  cursor: pointer;
}
/* 鼠標懸停時添加灰色背景顏色 */
.btn:hover {
  background-color: #ddd;
}
/* 為活動按鈕添加深色背景顏色 */
.btn.active {
  background-color: #666;
   color: white;
}

第三步 - 添加 JavaScript：

filterSelection("all") // 執行函數并顯示所有列
function filterSelection(c) {
  var x, i;
  x = document.getElementsByClassName("column");
  if (c == "all") c = "";
  // 將 "show" 類（display:block）添加到過濾后的元素中，并從未選中的元素中刪除 "show" 類
  for (i = 0; i < x.length; i++) {
    w3RemoveClass(x[i], "show");
    if (x[i].className.indexOf(c) > -1) w3AddClass(x[i], "show");
  }
}
// 顯示過濾后的元素
function w3AddClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {
      element.className += " " + arr2[i];
    }
  }
}
// 隱藏未選中的元素
function w3RemoveClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);
    }
  }
  element.className = arr1.join(" ");
}
// 將活動類添加到當前按鈕（突出顯示它）
var btnContainer = document.getElementById("myBtnContainer");
var btns = btnContainer.getElementsByClassName("btn");
for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", function(){
    var current = document.getElementsByClassName("active");
    current[0].className = current[0].className.replace(" active", "");
    this.className += " active";
  });
}

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