javascript - 如何使侧边栏导航栏默认打开

Question

我正在开发一个带有可折叠侧边栏导航的网站。它在加载时关闭时工作正常，但我想要做的是默认打开它并能够关闭和重新打开。

下面是正在使用的代码。如果您需要任何其他说明，请告诉我。

就像我说的那样，菜单可以正常打开和关闭，但我希望在开始打开然后在单击时关闭的位置反转 Angular 色。我觉得这是我忽略的小东西，但我不确定。

$(document).ready(function() {
  var trigger = $('.hamburger'),
    overlay = $('.overlay'),
    isClosed = false;

  trigger.click(function() {
    hamburger_cross();
  });

  function hamburger_cross() {

    if (isClosed == true) {
      //overlay.hide();
      trigger.removeClass('is-open');
      trigger.addClass('is-closed');
      isClosed = false;
    } else {
      //overlay.show();
      trigger.removeClass('is-closed');
      trigger.addClass('is-open');
      isClosed = true;
    }
  }

  $('[data-toggle="offcanvas"]').click(function() {
    $('#wrapper').toggleClass('toggled');
  });
});

body {
  position: relative;
  overflow-x: hidden;
}
body,
html {
  height: 100%;
}
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
  background-color: transparent;
}
/*-------------------------------*/

/*           Wrappers            */

/*-------------------------------*/

#wrapper {
  padding-left: 0;
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
#wrapper.toggled {
  padding-left: 220px;
}
#sidebar-wrapper {
  z-index: 1000;
  left: 220px;
  width: 0;
  height: 100%;
  margin-left: -220px;
  overflow-y: auto;
  overflow-x: hidden;
  background: #1a1a1a;
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
#sidebar-wrapper::-webkit-scrollbar {
  display: none;
}
#wrapper.toggled #sidebar-wrapper {
  width: 220px;
}
#page-content-wrapper {
  width: 100%;
  padding-top: 70px;
}
#wrapper.toggled #page-content-wrapper {
  position: absolute;
  margin-right: -220px;
}
/*-------------------------------*/

/*     Sidebar nav styles        */

/*-------------------------------*/

.sidebar-nav {
  position: absolute;
  top: 0;
  width: 220px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.sidebar-nav li {
  position: relative;
  line-height: 20px;
  display: inline-block;
  width: 100%;
}
.sidebar-nav li:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  height: 100%;
  width: 3px;
  background-color: #1c1c1c;
  -webkit-transition: width .2s ease-in;
  -moz-transition: width .2s ease-in;
  -ms-transition: width .2s ease-in;
  transition: width .2s ease-in;
}
.sidebar-nav li:first-child a {
  color: #fff;
  background-color: #1a1a1a;
}
.sidebar-nav li:nth-child(2):before {
  background-color: #ec1b5a;
}
.sidebar-nav li:nth-child(3):before {
  background-color: #79aefe;
}
.sidebar-nav li:nth-child(4):before {
  background-color: #314190;
}
.sidebar-nav li:nth-child(5):before {
  background-color: #279636;
}
.sidebar-nav li:nth-child(6):before {
  background-color: #7d5d81;
}
.sidebar-nav li:nth-child(7):before {
  background-color: #ead24c;
}
.sidebar-nav li:nth-child(8):before {
  background-color: #2d2366;
}
.sidebar-nav li:nth-child(9):before {
  background-color: #35acdf;
}
.sidebar-nav li:nth-child(10):before {
  background-color: #ec1b5a;
}
.sidebar-nav li:hover:before,
.sidebar-nav li.open:hover:before {
  width: 100%;
  -webkit-transition: width .2s ease-in;
  -moz-transition: width .2s ease-in;
  -ms-transition: width .2s ease-in;
  transition: width .2s ease-in;
}
.sidebar-nav li a {
  display: block;
  color: #ddd;
  text-decoration: none;
  padding: 10px 15px 10px 30px;
}
.sidebar-nav li a:hover,
.sidebar-nav li a:active,
.sidebar-nav li a:focus,
.sidebar-nav li.open a:hover,
.sidebar-nav li.open a:active,
.sidebar-nav li.open a:focus {
  color: #fff;
  text-decoration: none;
  background-color: transparent;
}
.sidebar-nav > .sidebar-brand {
  height: 65px;
  font-size: 20px;
  line-height: 44px;
}
.sidebar-nav .dropdown-menu {
  position: relative;
  width: 100%;
  padding: 0;
  margin: 0;
  border-radius: 0;
  border: none;
  background-color: #222;
  box-shadow: none;
}
/*-------------------------------*/

/*       Hamburger-Cross         */

/*-------------------------------*/

.hamburger {
  position: fixed;
  top: 20px;
  z-index: 999;
  display: block;
  width: 32px;
  height: 32px;
  margin-left: 15px;
  background: transparent;
  border: none;
}
.hamburger:hover,
.hamburger:focus,
.hamburger:active {
  outline: none;
}
.hamburger.is-closed:before {
  content: '';
  display: block;
  width: 100px;
  font-size: 14px;
  color: #fff;
  line-height: 32px;
  text-align: center;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover:before {
  opacity: 1;
  display: block;
  -webkit-transform: translate3d(-100px, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom,
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
  position: absolute;
  left: 0;
  height: 4px;
  width: 100%;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom {
  background-color: #1a1a1a;
}
.hamburger.is-closed .hamb-top {
  top: 5px;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-middle {
  top: 50%;
  margin-top: -2px;
}
.hamburger.is-closed .hamb-bottom {
  bottom: 5px;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-top {
  top: 0;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-bottom {
  bottom: 0;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
  background-color: #1a1a1a;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-bottom {
  top: 50%;
  margin-top: -2px;
}
.hamburger.is-open .hamb-top {
  -webkit-transform: rotate(45deg);
  -webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open .hamb-middle {
  display: none;
}
.hamburger.is-open .hamb-bottom {
  -webkit-transform: rotate(-45deg);
  -webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open:before {
  content: '';
  display: block;
  width: 100px;
  font-size: 14px;
  color: #fff;
  line-height: 32px;
  text-align: center;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open:hover:before {
  opacity: 1;
  display: block;
  -webkit-transform: translate3d(-100px, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
/*-------------------------------*/

/*            Overlay            */

/*-------------------------------*/

/*.overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(250,250,250,.8);
    z-index: 1;
}*/

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>


<div id="wrapper">
  <div class="overlay"></div>

  <!-- Sidebar -->
  <nav class="navbar navbar-inverse navbar-fixed-top" id="sidebar-wrapper" role="navigation">
    <ul class="nav sidebar-nav">
      <li class="sidebar-brand">
        <a href="#">
                       Brand
                    </a>
      </li>
      <li>
        <a href="#">Home</a>
      </li>
      <li>
        <a href="#">Participant</a>
      </li>
      <li>
        <a href="#">Interaction</a>
      </li>
      <li>
        <a href="#">Fulfillment</a>
      </li>
      <li>
        <a href="#">Reports</a>
      </li>
      <li>
        <a href="#">References</a>
      </li>
      <li>
        <a href="#">Admin</a>
      </li>
    </ul>
  </nav>
  <!-- /#sidebar-wrapper -->

  <!-- Page Content -->
  <div id="page-content-wrapper">
    <button type="button" class="hamburger is-closed" data-toggle="offcanvas">
      <span class="hamb-top"></span>
      <span class="hamb-middle"></span>
      <span class="hamb-bottom"></span>
    </button>
    <div class="container">
      <div class="row">
        <div class="col-lg-8 col-lg-offset-2">
          <h1>Quit Smoking</h1>
          <p>Why I want to quit I would save money. I would not smell like a stale cigarette. I would not have to look for a place to smoke all the time. My health would be better. I don't like feeling addicted. My family would stop nagging me to quit. Food
            would taste better. I would fit in better socially. I would feel better about my future. I would set a good example for my family and friends.</p>
        </div>
      </div>
    </div>
  </div>
  <!-- /#page-content-wrapper -->

</div>
<!-- /#wrapper -->

Answer 1

只需添加 class="toggled"在 <div id="wrapper" >和 isClosed = true;

同时更改 <button type="button" class="hamburger is-open" data-toggle="offcanvas"> 的类对于 is-closed至 is-open

$(document).ready(function() {
  var trigger = $('.hamburger'),
    overlay = $('.overlay'),
    isClosed = true;

  trigger.click(function() {
    hamburger_cross();
  });

  function hamburger_cross() {

    if (isClosed == true) {
      //overlay.hide();
      trigger.removeClass('is-open');
      trigger.addClass('is-closed');
      isClosed = false;
    } else {
      //overlay.show();
      trigger.removeClass('is-closed');
      trigger.addClass('is-open');
      isClosed = true;
    }
  }

  $('[data-toggle="offcanvas"]').click(function() {
    $('#wrapper').toggleClass('toggled');
  });
});

body {
  position: relative;
  overflow-x: hidden;
}
body,
html {
  height: 100%;
}
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
  background-color: transparent;
}
/*-------------------------------*/

/*           Wrappers            */

/*-------------------------------*/

#wrapper {
  padding-left: 0;
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
#wrapper.toggled {
  padding-left: 220px;
}
#sidebar-wrapper {
  z-index: 1000;
  left: 220px;
  width: 0;
  height: 100%;
  margin-left: -220px;
  overflow-y: auto;
  overflow-x: hidden;
  background: #1a1a1a;
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
#sidebar-wrapper::-webkit-scrollbar {
  display: none;
}
#wrapper.toggled #sidebar-wrapper {
  width: 220px;
}
#page-content-wrapper {
  width: 100%;
  padding-top: 70px;
}
#wrapper.toggled #page-content-wrapper {
  position: absolute;
  margin-right: -220px;
}
/*-------------------------------*/

/*     Sidebar nav styles        */

/*-------------------------------*/

.sidebar-nav {
  position: absolute;
  top: 0;
  width: 220px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.sidebar-nav li {
  position: relative;
  line-height: 20px;
  display: inline-block;
  width: 100%;
}
.sidebar-nav li:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  height: 100%;
  width: 3px;
  background-color: #1c1c1c;
  -webkit-transition: width .2s ease-in;
  -moz-transition: width .2s ease-in;
  -ms-transition: width .2s ease-in;
  transition: width .2s ease-in;
}
.sidebar-nav li:first-child a {
  color: #fff;
  background-color: #1a1a1a;
}
.sidebar-nav li:nth-child(2):before {
  background-color: #ec1b5a;
}
.sidebar-nav li:nth-child(3):before {
  background-color: #79aefe;
}
.sidebar-nav li:nth-child(4):before {
  background-color: #314190;
}
.sidebar-nav li:nth-child(5):before {
  background-color: #279636;
}
.sidebar-nav li:nth-child(6):before {
  background-color: #7d5d81;
}
.sidebar-nav li:nth-child(7):before {
  background-color: #ead24c;
}
.sidebar-nav li:nth-child(8):before {
  background-color: #2d2366;
}
.sidebar-nav li:nth-child(9):before {
  background-color: #35acdf;
}
.sidebar-nav li:nth-child(10):before {
  background-color: #ec1b5a;
}
.sidebar-nav li:hover:before,
.sidebar-nav li.open:hover:before {
  width: 100%;
  -webkit-transition: width .2s ease-in;
  -moz-transition: width .2s ease-in;
  -ms-transition: width .2s ease-in;
  transition: width .2s ease-in;
}
.sidebar-nav li a {
  display: block;
  color: #ddd;
  text-decoration: none;
  padding: 10px 15px 10px 30px;
}
.sidebar-nav li a:hover,
.sidebar-nav li a:active,
.sidebar-nav li a:focus,
.sidebar-nav li.open a:hover,
.sidebar-nav li.open a:active,
.sidebar-nav li.open a:focus {
  color: #fff;
  text-decoration: none;
  background-color: transparent;
}
.sidebar-nav > .sidebar-brand {
  height: 65px;
  font-size: 20px;
  line-height: 44px;
}
.sidebar-nav .dropdown-menu {
  position: relative;
  width: 100%;
  padding: 0;
  margin: 0;
  border-radius: 0;
  border: none;
  background-color: #222;
  box-shadow: none;
}
/*-------------------------------*/

/*       Hamburger-Cross         */

/*-------------------------------*/

.hamburger {
  position: fixed;
  top: 20px;
  z-index: 999;
  display: block;
  width: 32px;
  height: 32px;
  margin-left: 15px;
  background: transparent;
  border: none;
}
.hamburger:hover,
.hamburger:focus,
.hamburger:active {
  outline: none;
}
.hamburger.is-closed:before {
  content: '';
  display: block;
  width: 100px;
  font-size: 14px;
  color: #fff;
  line-height: 32px;
  text-align: center;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover:before {
  opacity: 1;
  display: block;
  -webkit-transform: translate3d(-100px, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom,
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
  position: absolute;
  left: 0;
  height: 4px;
  width: 100%;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom {
  background-color: #1a1a1a;
}
.hamburger.is-closed .hamb-top {
  top: 5px;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-middle {
  top: 50%;
  margin-top: -2px;
}
.hamburger.is-closed .hamb-bottom {
  bottom: 5px;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-top {
  top: 0;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-bottom {
  bottom: 0;
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
  background-color: #1a1a1a;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-bottom {
  top: 50%;
  margin-top: -2px;
}
.hamburger.is-open .hamb-top {
  -webkit-transform: rotate(45deg);
  -webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open .hamb-middle {
  display: none;
}
.hamburger.is-open .hamb-bottom {
  -webkit-transform: rotate(-45deg);
  -webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open:before {
  content: '';
  display: block;
  width: 100px;
  font-size: 14px;
  color: #fff;
  line-height: 32px;
  text-align: center;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open:hover:before {
  opacity: 1;
  display: block;
  -webkit-transform: translate3d(-100px, 0, 0);
  -webkit-transition: all .35s ease-in-out;
}
/*-------------------------------*/

/*            Overlay            */

/*-------------------------------*/

/*.overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(250,250,250,.8);
    z-index: 1;
}*/

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>


<div id="wrapper"  class="toggled" >
  <div class="overlay"></div>

  <!-- Sidebar -->
  <nav class="navbar navbar-inverse navbar-fixed-top" id="sidebar-wrapper" role="navigation">
    <ul class="nav sidebar-nav">
      <li class="sidebar-brand">
        <a href="#">
                       Brand
                    </a>
      </li>
      <li>
        <a href="#">Home</a>
      </li>
      <li>
        <a href="#">Participant</a>
      </li>
      <li>
        <a href="#">Interaction</a>
      </li>
      <li>
        <a href="#">Fulfillment</a>
      </li>
      <li>
        <a href="#">Reports</a>
      </li>
      <li>
        <a href="#">References</a>
      </li>
      <li>
        <a href="#">Admin</a>
      </li>
    </ul>
  </nav>
  <!-- /#sidebar-wrapper -->

  <!-- Page Content -->
  <div id="page-content-wrapper">
    <button type="button" class="hamburger is-open" data-toggle="offcanvas">
      <span class="hamb-top"></span>
      <span class="hamb-middle"></span>
      <span class="hamb-bottom"></span>
    </button>
   
    <div class="container">
      <div class="row">
        <div class="col-lg-8 col-lg-offset-2">
          <h1>Quit Smoking</h1>
          <p>Why I want to quit I would save money. I would not smell like a stale cigarette. I would not have to look for a place to smoke all the time. My health would be better. I don't like feeling addicted. My family would stop nagging me to quit. Food
           
            would taste better. I would fit in better socially. I would feel better about my future. I would set a good example for my family and friends.</p>
        </div>
      </div>
    </div>
  </div>
  <!-- /#page-content-wrapper -->

</div>
<!-- /#wrapper -->