可滚动的固定形式显示在左侧

Question

我想在屏幕左侧显示一个邮件图标，就像下面的图像一样，即使我们滚动页面也会保留在固定位置，但是当点击带有输入字段的小表格时通讯滑出。

我怎么能得到它？

Answer 1

有一个简单的例子。填写表格。点击“整页”。在这里预览片段不好的作品

// Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks the button, open the modal 
btn.onclick = function() {
  modal.style.display = "block";
}

// When the user clicks on <span> (x), close the modal
span.onclick = function() {
  modal.style.display = "none";
}

// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = "none";
  }
}

.page {
  width: 980 px;
  margin: 0 auto;
  height: 1200px;
  border: 3px solid red;
}

.form {
  top: 300px;
  left: 20px;
  display: block;
  position: fixed;
  border: 1px solid black;
}


/* The Modal (background) */

.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  /* Stay in place */
  z-index: 1;
  /* Sit on top */
  left: 0;
  top: 0;
  width: 100%;
  /* Full width */
  height: 100%;
  /* Full height */
  overflow: auto;
  /* Enable scroll if needed */
  background-color: rgb(0, 0, 0);
  /* Fallback color */
  background-color: rgba(0, 0, 0, 0.4);
  /* Black w/ opacity */
}


/* Modal Content/Box */

.modal-content {
  background-color: #fefefe;
  margin: 15% auto;
  /* 15% from the top and centered */
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  /* Could be more or less, depending on screen size */
}


/* The Close Button */

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

<div class="page">
  <div class="form">
    <!-- Trigger/Open The Modal -->
    <button id="myBtn">My form</button>
    <!-- The Modal -->
    <div id="myModal" class="modal">

      <!-- Modal content -->
      <div class="modal-content">
        <span class="close">&times;</span>
        <p>Some text in the Modal..</p>
      </div>

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