联系表单动画

Question

我有以下代码：

input[type=text], [type=email], select, textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #555;
  margin-top: 6px;
  margin-bottom: 16px;
  resize: vertical;
}

input[type=submit] {
  background-color: #0563bb;
  color: white;
  padding: 12px 20px;
  border: none;
  cursor: pointer;
}

input[type=submit]:hover {
  opacity: 0.9;
}


.contactform {
  position: relative;    
  border-radius: 50px;
  background-color: #f2f2f2;
  padding: 5px;
  z-index:2;
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-bottom:auto;
  margin-top:1%;    
  width: 100%;
  animation-name: gradient;
  animation-duration: 3s;
  animation-iteration-count: infinite;  
    
}
    
.contactform:hover { 
 animation-name: gradient;
 animation-duration: 15s;
 animation-iteration-count: infinite;    
       
}

.column {
  float: center;
  width: 50%;
  margin-top: 6px;
  padding: 20px;
  display: block;
  margin-left: auto;
  margin-right: auto;    
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

@media screen and (max-width: 600px) {
  .column, input[type=submit] {
    width: auto;
    margin-top:0;
  }
}

 <section id="contact">
  <div class="container" data-aos="fade-up">
    <div class="contactform">
      <div style="text-align:center">
        <div class="section-title">
          <h2><br/>Get In Touch</h2>
        </div>
        <p>Feel Free To Reach Out To Me Through This Form! </p>
      </div>
      <div class="row">
        <div class="column">
          <form name="myform" action="thankyou.html" method="POST">
            <label for="firstname">First Name</label>
            <input type="text" id="first name" name="firstname" placeholder="Your firstname.." required>

            <label for="lastname">Last Name</label>
            <input type="text" id="lastname" name="lastname" placeholder="Your last name.." required>

            <label for="email">Email:</label>
            <input type="email" id="email" name="email" placeholder="Your Email.." required>

            <label for="subject">Subject</label>
            <textarea id="subject" name="subject" placeholder="Lets Collaborate..." style="height:170px" required></textarea>
            <input type="submit" value="Submit">
          </form>
        </div>
      </div>
    </div>
  </div>
</section>

所以我基本上要寻找的是用户在没有输入任何输入的情况下提交时的抖动效果。

预期输出

当用户在没有输入任何内容的情况下点击提交按钮时，框的边框应该变成红色并且会抖动。我只希望占位符的框摇晃并变红，而不是整个元素。我尝试添加关键帧来实现这一点，但由于没有获得所需的输出而卡住了，有什么建议吗？

换句话说，我只想让方框的 first name、last name、email 和 subject 边框变红并抖动。

Answer 1

为 submit 添加事件侦听器，循环遍历所有输入和文本区域字段并检查它们是否对 checkValidity() 有效。如果它们无效，我们使用 borderColor 样式属性将它们的边框颜色设置为红色，并使用 animation 样式属性设置它们的动画。

为了能够一遍又一遍地播放相同的动画，我们可以使用setTimeout等待指定的毫秒数，然后将animation样式属性设置回unset.

document.querySelector('form').addEventListener('submit', function(e) {
  var isValid = true;
  this.querySelectorAll('input, textarea').forEach(function(f) {
    if (!f.checkValidity()) {
      isValid = false;
      f.style.borderColor = "red";
      f.style.animation = "shake 0.82s forwards";
      setTimeout(function(){f.style.animation="unset";},820);
    }else{
      f.style.borderColor = "initial";
      //Sets it back to normal if the field is valid
    }
  })
  if (!isValid) {
    e.preventDefault();
  }
})

input[type=text],
[type=email],
select,
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #555;
  margin-top: 6px;
  margin-bottom: 16px;
  resize: vertical;
}

input[type=submit] {
  background-color: #0563bb;
  color: white;
  padding: 12px 20px;
  border: none;
  cursor: pointer;
}

input[type=submit]:hover {
  opacity: 0.9;
}

.contactform {
  position: relative;
  border-radius: 50px;
  background-color: #f2f2f2;
  padding: 5px;
  z-index: 2;
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: auto;
  margin-top: 1%;
  width: 100%;
  animation-name: gradient;
  animation-duration: 3s;
  animation-iteration-count: infinite;
}

.contactform:hover {
  animation-name: gradient;
  animation-duration: 15s;
  animation-iteration-count: infinite;
}

.column {
  float: center;
  width: 50%;
  margin-top: 6px;
  padding: 20px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

@media screen and (max-width: 600px) {
  .column,
  input[type=submit] {
    width: auto;
    margin-top: 0;
  }
}

@keyframes shake {
  10%,
  90% {
    transform: translate3d(-1px, 0, 0);
  }
  20%,
  80% {
    transform: translate3d(2px, 0, 0);
  }
  30%,
  50%,
  70% {
    transform: translate3d(-4px, 0, 0);
  }
  40%,
  60% {
    transform: translate3d(4px, 0, 0);
  }
}

<section id="contact">
  <div class="container" data-aos="fade-up">
    <div class="contactform">
      <div style="text-align:center">
        <div class="section-title">
          <h2><br/>Get In Touch</h2>
        </div>
        <p>Feel Free To Reach Out To Me Through This Form! </p>
      </div>
      <div class="row">
        <div class="column">
          <form name="myform" action="thankyou.html" method="POST" novalidate>
            <label for="firstname">First Name</label>
            <input type="text" id="first name" name="firstname" placeholder="Your firstname.." required>

            <label for="lastname">Last Name</label>
            <input type="text" id="lastname" name="lastname" placeholder="Your last name.." required>

            <label for="email">Email:</label>
            <input type="email" id="email" name="email" placeholder="Your Email.." required>

            <label for="subject">Subject</label>
            <textarea id="subject" name="subject" placeholder="Lets Collaborate..." style="height:170px" required></textarea>
            <input type="submit" value="Submit">
          </form>
        </div>
      </div>
    </div>
  </div>
</section>

联系表单动画

Contact Form Animation

javascript

html

jquery

css

contact-form-7

预期输出