EP08 | 跟著影片做前端切版練習 - Button Hover Animation Effects

發表於 更新於 分類於 ， ， ，

練習影片

練習重點

結構

HTML

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<body>
<button class="btn btn-fill">
  <!--左-->
  <span></span>
  <!--上-->
  <span></span>
  <!--右-->
  <span></span>
  <!--下-->
  <span></span>
  button
</button>
</body>

CSS

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/*使用原生 CSS 變數*/
:root {
  --primary: #027be8;
  --btn-primary: #36454f;
}
body {
  height: 100vh;
  background: #565656;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.btn {
  font-size: 3.5em;
  text-transform: uppercase;
  color: var(--primary);
  /*消除 button 原本樣式*/
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  outline: none;
  border: none;
  padding: 20px 40px;
  background: var(--btn-primary);
  position: relative;
}

.btn-fill span {
  position: absolute;
  background: var(--primary);
  transform: scale(0);
  transition: transform 0.3s;
}

/*利用 transform-origin 來設定每個線條的起始點*/
/*從 :hover 到無時適用*/
.btn-fill span:nth-child(1) {
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  transform-origin: top;
}

.btn-fill span:nth-child(2) {
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform-origin: right;
  transition-delay: 0.3s;
}

.btn-fill span:nth-child(3) {
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  transform-origin: bottom;
  transition-delay: 0.6s;
}

.btn-fill span:nth-child(4) {
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform-origin: left;
  transition-delay: 0.9s;
}

.btn-fill:hover {
  background: var(--primary);
  color: var(--btn-primary);
  transition: all 0.3s;
  transition-delay: 1.2s;
}

.btn-fill:hover span {
  transform: scale(1);
}

/*有 hover 時(滑鼠滑過)套用*/
/*無到有 :hover 時適用*/
/*跟沒 :hover 設定的 transform-origin 方向相反，即可得到展開回收感*/
.btn-fill:hover span:nth-child(1) {
  transform-origin: bottom;
}

.btn-fill:hover span:nth-child(2) {
  transform-origin: left;
}

.btn-fill:hover span:nth-child(3) {
  transform-origin: top;
}

.btn-fill:hover span:nth-child(4) {
  transform-origin: right;
}

Demo:

See the Pen EP08 | 跟著影片做前端切版練習 - Advanced CSS Button Hover Animation Effects by Celeste6666 (@celeste6666) on CodePen.