一个简洁的导航滑块

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css

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html

css

@import url(https://fonts.googleapis.com/css?family=Roboto);
body {
  margin: 0;
  font-family: "Roboto", "Helvetica Neue", "Helvetica",  "Arial", sans-serif;
  background: #eaeaea;
}

section#nav-test {
  height: 100vh;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
}
section#nav-test #nav-container {
  position: relative;
  margin: 60px auto;
  box-sizing: border-box;
}
section#nav-test #nav-container ul {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  background: #323639;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 1px 5px 0 rgba(0, 0, 0, 0.12), 0 3px 1px -2px rgba(0, 0, 0, 0.2);
  padding-left: 30px;
  padding-right: 30px;
  margin: 0;
}
section#nav-test #nav-container ul li {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  min-height: 48px;
  margin-left: 60px;
  cursor: pointer;
}
section#nav-test #nav-container ul li:first-child {
  margin-left: 0;
}
section#nav-test #nav-container ul li a {
  color: #f1f1f1;
}
section#nav-test #nav-container #line {
  position: absolute;
  bottom: 0;
  height: 2px;
  background: red;
  -webkit-transition: all 150ms ease-in-out;
  transition: all 150ms ease-in-out;
}
section#nav-test h1 {
  margin-top: 30px;
  font-weight: 500;
  color: #212121;
}

JavaScript

(function () {
    $(function () {
        var $activeWidth, $defaultMarginLeft, $defaultPaddingLeft, $firstChild, $line, $navListItem;
        $line = $('#line');
        $navListItem = $('.nav-li');
        $activeWidth = $('.active-nav').width();
        $firstChild = $('.nav-li:first-child');
        $defaultMarginLeft = parseInt($('.nav-li:first-child').next().css('marginLeft').replace(/\D/g, ''));
        $defaultPaddingLeft = parseInt($('#nav-container > ul').css('padding-left').replace(/\D/g, ''));
        $line.width($activeWidth + 'px');
        $line.css('marginLeft', $defaultPaddingLeft + 'px');
        return $navListItem.click(function () {
            var $activeNav, $currentIndex, $currentOffset, $currentWidth, $initWidth, $marginLeftToSet, $this;
            $this = $(this);
            $activeNav = $('.active-nav');
            $currentWidth = $activeNav.width();
            $currentOffset = $activeNav.position().left;
            $currentIndex = $activeNav.index();
            $activeNav.removeClass('active-nav');
            $this.addClass('active-nav');
            if ($this.index() > $currentIndex) {
                if ($activeNav.is($firstChild)) {
                    $initWidth = $defaultMarginLeft + $this.width() + $this.position().left - $defaultPaddingLeft;
                } else {
                    $initWidth = $this.position().left + $this.width() - $currentOffset;
                }
                $marginLeftToSet = $this.position().left + $defaultMarginLeft + 'px';
                $line.width($initWidth + 'px');
                return setTimeout(function () {
                    $line.css('marginLeft', $marginLeftToSet);
                    return $line.width($this.width() + 'px');
                }, 175);
            } else {
                if ($this.is($firstChild)) {
                    $initWidth = $currentOffset - $defaultPaddingLeft + $defaultMarginLeft + $currentWidth;
                    $marginLeftToSet = $this.position().left;
                } else {
                    $initWidth = $currentWidth + $currentOffset - $this.position().left;
                    $marginLeftToSet = $this.position().left + $defaultMarginLeft;
                }
                $line.css('marginLeft', $marginLeftToSet);
                $line.width($initWidth + 'px');
                return setTimeout(function () {
                    return $line.width($this.width() + 'px');
                }, 175);
            }
        });
    });
}.call(this));

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