svg移动端滑动导航实验

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html

css

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html

<div class="nav__item">
    <button>
        <svg class="icon" viewBox="0 0 24 24">
            <path fill="#000000" d="M12,4A4,4 0 0,1 16,8A4,4 0 0,1 12,12A4,4 0 0,1 8,8A4,4 0 0,1 12,4M12,6A2,2 0 0,0 10,8A2,2 0 0,0 12,10A2,2 0 0,0 14,8A2,2 0 0,0 12,6M12,13C14.67,13 20,14.33 20,17V20H4V17C4,14.33 9.33,13 12,13M12,14.9C9.03,14.9 5.9,16.36 5.9,17V18.1H18.1V17C18.1,16.36 14.97,14.9 12,14.9Z" />
        </svg>
        <span class="text" data-title="Three">Three</span>
      </button>
  </div>

</div>

css

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

html,
body {
  height: 100%;
}

:root {
  --active-indicator-width: 120px;
  --icon-width: 26px;
  --icon-margin-right: 9px;
  --menu-padding-horizontal: 29px;
  --menu-padding-vertical: 20px;
  --active-indicator-extra-length: 12px; /* We want the indicator to be longer than the actual buttons themselves, this length is added to both sides of the indicator */
  --space-between-icons: 32px;
}

@media (max-width: 600px) {
  :root {
    --active-indicator-width: 80px;
    --icon-margin-right: 7px;
    --menu-padding-horizontal: 24px;
  }
}

body {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #297bf7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.nav {
  background: #fff;
  padding: var(--menu-padding-vertical) var(--menu-padding-horizontal);
  display: flex;
  box-shadow: 0 0 14px 0 rgba(0, 0, 0, 0.1);
  border-radius: 1px;
  position: relative;
}

.nav__active-indicator {
  position: absolute;
  top: 50%;
  margin-left: calc(
    var(--menu-padding-horizontal) - var(--active-indicator-extra-length)
  );
  left: 0;
  transform: translateY(-50%);
  width: calc(
    var(--active-indicator-width) + var(--active-indicator-extra-length) * 2
  );
  height: calc(100% - var(--menu-padding-vertical));
  background: #f7c329;
  z-index: 10;
  border-radius: var(--active-indicator-width);
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.nav__item {
  margin-left: var(--space-between-icons);
  position: relative;
  z-index: 20;
}

.nav__item:first-child {
  margin-left: 0;
}

button {
  padding: 0;
  border: 0;
  display: flex;
  align-items: center;
  cursor: pointer;
  width: var(--icon-width);
  transition: width 0.3s cubic-bezier(0.215, 0.61, 0.355, 1); /* I knowwww, don't animate width, but it doesn't actually look jittery in this case - so maybe it just works in this case? If not there are alternatives we can try */
  outline: none;
  position: relative;
  background: transparent;
}

.active {
  width: var(--active-indicator-width);
}

.icon {
  display: block;
  margin-right: var(--icon-margin-right);
  flex-shrink: 0;
  width: var(--icon-width);
  height: var(--icon-width);
}

.icon path {
  fill: #a6adb1;
  transition: fill 0.2s;
}

.active .icon path {
  fill: #000;
}

.text {
  display: block;
  color: rgba(0, 0, 0, 0);
  pointer-events: none;
  font-size: 0;
}

.text:after {
  content: attr(data-title);
  position: absolute;
  top: 0;
  left: 0;
  width: var(--active-indicator-width);
  height: 100%;
  opacity: 0;
  display: flex;
  align-items: center;
  font-size: 15px;
  font-weight: bold;
  color: #000;
  padding-left: calc(var(--icon-width) + var(--icon-margin-right));
  transition: opacity 0s;
}

.slide-right .text:after {
  left: 0;
  right: auto;
}
.slide-left .text:after {
  right: 0;
  left: auto;
}

.active .text:after {
  opacity: 1;
  transition: opacity 0.4s;
}

JavaScript

// ---------
// Variables
// ---------

const nav = document.querySelector(".nav");
const navActiveIndicator = document.querySelector(".nav__active-indicator");
const buttons = document.querySelectorAll("button");
let activeButton = document.querySelector(".active");

// ---
// App
// ---

setIndexKey(buttons);

buttons.forEach(button => {
  button.addEventListener("click", buttonClick);
});

// ---------
// Functions
// ---------

function setIndexKey(arrayOfElements) {
  arrayOfElements.forEach((element, index) => {
    element.index = index;
  });
}

function buttonClick() {
  // Position the text so that it appears to not move with the button width growth
  if (this.index > activeButton.index) {
    nav.classList.remove("slide-right");
    nav.classList.add("slide-left");
  } else {
    nav.classList.remove("slide-left");
    nav.classList.add("slide-right");
  }

// Animate the active indicator position
  const iconWidth = parseInt(
  getComputedStyle(document.documentElement).getPropertyValue("--icon-width"));

const spaceBetweenIcons = parseInt(
  getComputedStyle(document.documentElement).getPropertyValue(
  "--space-between-icons"));

navActiveIndicator.style.transform = `translateX(${(iconWidth +
  spaceBetweenIcons) *
  this.index}px) translateY(-50%)`;

// Update the active button
  if (activeButton) activeButton.classList.remove("active");
  this.classList.add("active");
  activeButton = this;
}

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