javascript - 按钮在注册表单中不起作用

Question

所以我尝试用“Eric”写的笔运行这段代码 https://codepen.io/ehermanson/pen/KwKWEv .

这正在运行，Codepen.io 上没有任何问题。但是当我尝试将代码复制到我的编辑器时，我无法获得结果，即，当我单击“登录”按钮时我无法获得结果。

HTML

    <div class="form">

  <ul class="tab-group">
    <li class="tab active"><a href="#signup">Sign Up</a></li>
    <li class="tab"><a href="#login">Log In</a></li>
  </ul>

  <div class="tab-content">
    <div id="signup">
      <h1>Sign Up for Free</h1>

      <form action="/" method="post">

        <div class="top-row">
          <div class="field-wrap">
            <label>
                First Name<span class="req">*</span>
              </label>
            <input type="text" required autocomplete="off" />
          </div>

          <div class="field-wrap">
            <label>
                Last Name<span class="req">*</span>
              </label>
            <input type="text" required autocomplete="off" />
          </div>
        </div>

        <div class="field-wrap">
          <label>
              Email Address<span class="req">*</span>
            </label>
          <input type="email" required autocomplete="off" />
        </div>

        <div class="field-wrap">
          <label>
              Set A Password<span class="req">*</span>
            </label>
          <input type="password" required autocomplete="off" />
        </div>

        <button type="submit" class="button button-block" />Get Started</button>

      </form>

    </div>

    <div id="login">
      <h1>Welcome Back!</h1>

      <form action="/" method="post">

        <div class="field-wrap">
          <label>
              Email Address<span class="req">*</span>
            </label>
          <input type="email" required autocomplete="off" />
        </div>

        <div class="field-wrap">
          <label>
              Password<span class="req">*</span>
            </label>
          <input type="password" required autocomplete="off" />
        </div>

        <p class="forgot"><a href="#">Forgot Password?</a></p>

        <button class="button button-block" />Log In</button>

      </form>

    </div>

  </div>
  <!-- tab-content -->

</div>
<!-- /form -->

CSS

@import "compass/css3";
$body-bg: #c1bdba;
$form-bg: #13232f;
$white: #ffffff;
$main: #1ab188;
$main-light: lighten($main, 5%);
$main-dark: darken($main, 5%);
$gray-light: #a0b3b0;
$gray: #ddd;
$thin: 300;
$normal: 400;
$bold: 600;
$br: 4px;
*,
*:before,
*:after {
  box-sizing: border-box;
}

html {
  overflow-y: scroll;
}

body {
  background: $body-bg;
  font-family: 'Titillium Web', sans-serif;
}

a {
  text-decoration: none;
  color: $main;
  transition: .5s ease;
  &:hover {
    color: $main-dark;
  }
}

.form {
  background: rgba($form-bg, .9);
  padding: 40px;
  max-width: 600px;
  margin: 40px auto;
  border-radius: $br;
  box-shadow: 0 4px 10px 4px rgba($form-bg, .3);
}

.tab-group {
  list-style: none;
  padding: 0;
  margin: 0 0 40px 0;
  &:after {
    content: "";
    display: table;
    clear: both;
  }
  li a {
    display: block;
    text-decoration: none;
    padding: 15px;
    background: rgba($gray-light, .25);
    color: $gray-light;
    font-size: 20px;
    float: left;
    width: 50%;
    text-align: center;
    cursor: pointer;
    transition: .5s ease;
    &:hover {
      background: $main-dark;
      color: $white;
    }
  }
  .active a {
    background: $main;
    color: $white;
  }
}

.tab-content > div:last-child {
  display: none;
}

h1 {
  text-align: center;
  color: $white;
  font-weight: $thin;
  margin: 0 0 40px;
}

label {
  position: absolute;
  transform: translateY(6px);
  left: 13px;
  color: rgba($white, .5);
  transition: all 0.25s ease;
  -webkit-backface-visibility: hidden;
  pointer-events: none;
  font-size: 22px;
  .req {
    margin: 2px;
    color: $main;
  }
}

label.active {
  transform: translateY(50px);
  left: 2px;
  font-size: 14px;
  .req {
    opacity: 0;
  }
}

label.highlight {
  color: $white;
}

input,
textarea {
  font-size: 22px;
  display: block;
  width: 100%;
  height: 100%;
  padding: 5px 10px;
  background: none;
  background-image: none;
  border: 1px solid $gray-light;
  color: $white;
  border-radius: 0;
  transition: border-color .25s ease, box-shadow .25s ease;
  &:focus {
    outline: 0;
    border-color: $main;
  }
}

textarea {
  border: 2px solid $gray-light;
  resize: vertical;
}

.field-wrap {
  position: relative;
  margin-bottom: 40px;
}

.top-row {
  &:after {
    content: "";
    display: table;
    clear: both;
  }
  > div {
    float: left;
    width: 48%;
    margin-right: 4%;
    &:last-child {
      margin: 0;
    }
  }
}

.button {
  border: 0;
  outline: none;
  border-radius: 0;
  padding: 15px 0;
  font-size: 2rem;
  font-weight: $bold;
  text-transform: uppercase;
  letter-spacing: .1em;
  background: $main;
  color: $white;
  transition: all.5s ease;
  -webkit-appearance: none;
  &:hover,
  &:focus {
    background: $main-dark;
  }
}

.button-block {
  display: block;
  width: 100%;
}

.forgot {
  margin-top: -20px;
  text-align: right;
}

JavaScript

$('.form').find('input, textarea').on('keyup blur focus', function(e) {

  var $this = $(this),
    label = $this.prev('label');

  if (e.type === 'keyup') {
    if ($this.val() === '') {
      label.removeClass('active highlight');
    } else {
      label.addClass('active highlight');
    }
  } else if (e.type === 'blur') {
    if ($this.val() === '') {
      label.removeClass('active highlight');
    } else {
      label.removeClass('highlight');
    }
  } else if (e.type === 'focus') {

    if ($this.val() === '') {
      label.removeClass('highlight');
    } else if ($this.val() !== '') {
      label.addClass('highlight');
    }
  }

});

$('.tab a').on('click', function(e) {

  e.preventDefault();

  $(this).parent().addClass('active');
  $(this).parent().siblings().removeClass('active');

  target = $(this).attr('href');

  $('.tab-content > div').not(target).hide();

  $(target).fadeIn(600);

});

Answer 1

使用此代码:-

$('.form').find('input, textarea').on('keyup blur focus', function (e) {
  
  var $this = $(this),
      label = $this.prev('label');

	  if (e.type === 'keyup') {
			if ($this.val() === '') {
          label.removeClass('active highlight');
        } else {
          label.addClass('active highlight');
        }
    } else if (e.type === 'blur') {
    	if( $this.val() === '' ) {
    		label.removeClass('active highlight'); 
			} else {
		    label.removeClass('highlight');   
			}   
    } else if (e.type === 'focus') {
      
      if( $this.val() === '' ) {
    		label.removeClass('highlight'); 
			} 
      else if( $this.val() !== '' ) {
		    label.addClass('highlight');
			}
    }

});

$('.tab a').on('click', function (e) {
  
  e.preventDefault();
  
  $(this).parent().addClass('active');
  $(this).parent().siblings().removeClass('active');
  
  target = $(this).attr('href');

  $('.tab-content > div').not(target).hide();
  
  $(target).fadeIn(600);
  
});

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

html {
  overflow-y: scroll;
}

body {
  background: #c1bdba;
  font-family: 'Titillium Web', sans-serif;
}

a {
  text-decoration: none;
  color: #1ab188;
  -webkit-transition: .5s ease;
  transition: .5s ease;
}
a:hover {
  color: #179b77;
}

.form {
  background: rgba(19, 35, 47, 0.9);
  padding: 40px;
  max-width: 600px;
  margin: 40px auto;
  border-radius: 4px;
  box-shadow: 0 4px 10px 4px rgba(19, 35, 47, 0.3);
}

.tab-group {
  list-style: none;
  padding: 0;
  margin: 0 0 40px 0;
}
.tab-group:after {
  content: "";
  display: table;
  clear: both;
}
.tab-group li a {
  display: block;
  text-decoration: none;
  padding: 15px;
  background: rgba(160, 179, 176, 0.25);
  color: #a0b3b0;
  font-size: 20px;
  float: left;
  width: 50%;
  text-align: center;
  cursor: pointer;
  -webkit-transition: .5s ease;
  transition: .5s ease;
}
.tab-group li a:hover {
  background: #179b77;
  color: #ffffff;
}
.tab-group .active a {
  background: #1ab188;
  color: #ffffff;
}

.tab-content > div:last-child {
  display: none;
}

h1 {
  text-align: center;
  color: #ffffff;
  font-weight: 300;
  margin: 0 0 40px;
}

label {
  position: absolute;
  -webkit-transform: translateY(6px);
          transform: translateY(6px);
  left: 13px;
  color: rgba(255, 255, 255, 0.5);
  -webkit-transition: all 0.25s ease;
  transition: all 0.25s ease;
  -webkit-backface-visibility: hidden;
  pointer-events: none;
  font-size: 22px;
}
label .req {
  margin: 2px;
  color: #1ab188;
}

label.active {
  -webkit-transform: translateY(50px);
          transform: translateY(50px);
  left: 2px;
  font-size: 14px;
}
label.active .req {
  opacity: 0;
}

label.highlight {
  color: #ffffff;
}

input, textarea {
  font-size: 22px;
  display: block;
  width: 100%;
  height: 100%;
  padding: 5px 10px;
  background: none;
  background-image: none;
  border: 1px solid #a0b3b0;
  color: #ffffff;
  border-radius: 0;
  -webkit-transition: border-color .25s ease, box-shadow .25s ease;
  transition: border-color .25s ease, box-shadow .25s ease;
}
input:focus, textarea:focus {
  outline: 0;
  border-color: #1ab188;
}

textarea {
  border: 2px solid #a0b3b0;
  resize: vertical;
}

.field-wrap {
  position: relative;
  margin-bottom: 40px;
}

.top-row:after {
  content: "";
  display: table;
  clear: both;
}
.top-row > div {
  float: left;
  width: 48%;
  margin-right: 4%;
}
.top-row > div:last-child {
  margin: 0;
}

.button {
  border: 0;
  outline: none;
  border-radius: 0;
  padding: 15px 0;
  font-size: 2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  background: #1ab188;
  color: #ffffff;
  -webkit-transition: all 0.5s ease;
  transition: all 0.5s ease;
  -webkit-appearance: none;
}
.button:hover, .button:focus {
  background: #179b77;
}

.button-block {
  display: block;
  width: 100%;
}

.forgot {
  margin-top: -20px;
  text-align: right;
}

<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>Sign-Up/Login Form</title>
  <link href='http://fonts.googleapis.com/css?family=Titillium+Web:400,300,600' rel='stylesheet' type='text/css'>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">

   <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>

  
</head>

<body>
  <div class="form">
      
      <ul class="tab-group">
        <li class="tab active"><a href="#signup">Sign Up</a></li>
        <li class="tab"><a href="#login">Log In</a></li>
      </ul>
      
      <div class="tab-content">
        <div id="signup">   
          <h1>Sign Up for Free</h1>
          
          <form action="/" method="post">
          
          <div class="top-row">
            <div class="field-wrap">
              <label>
                First Name<span class="req">*</span>
              </label>
              <input type="text" required autocomplete="off" />
            </div>
        
            <div class="field-wrap">
              <label>
                Last Name<span class="req">*</span>
              </label>
              <input type="text"required autocomplete="off"/>
            </div>
          </div>

          <div class="field-wrap">
            <label>
              Email Address<span class="req">*</span>
            </label>
            <input type="email"required autocomplete="off"/>
          </div>
          
          <div class="field-wrap">
            <label>
              Set A Password<span class="req">*</span>
            </label>
            <input type="password"required autocomplete="off"/>
          </div>
          
          <button type="submit" class="button button-block"/>Get Started</button>
          
          </form>

        </div>
        
        <div id="login">   
          <h1>Welcome Back!</h1>
          
          <form action="/" method="post">
          
            <div class="field-wrap">
            <label>
              Email Address<span class="req">*</span>
            </label>
            <input type="email"required autocomplete="off"/>
          </div>
          
          <div class="field-wrap">
            <label>
              Password<span class="req">*</span>
            </label>
            <input type="password"required autocomplete="off"/>
          </div>
          
          <p class="forgot"><a href="#">Forgot Password?</a></p>
          
          <button class="button button-block"/>Log In</button>
          
          </form>

        </div>
        
      </div>
      
</div>

</body>
</html>