javascript - 从占位符获取信息到标签

Question

下面是我使用 HTML、CSS 和 JavaScript 创建的联系表单的代码。是否可以在预览按钮页面下使用 label2 来说明用户在主页上的 Detail 占位符中键入的内容？因此，如果有人在 Detail 占位符中写了“Hello”，预览页面上的 label2 就会说“Hello”。任何帮助，干杯。

function openNav() {
    document.getElementById("myNav").style.width = "100%";
}

function closeNav() {
    document.getElementById("myNav").style.width = "0%";
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  -o-font-smoothing: antialiased;
  font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  margin: 0 auto;
  position: relative;
}

#contact input[type="text"],
#contact input[type="email"],
#contact input[type="tel"],
#contact textarea,
#contact button[type="submit"] {
  font: 400 12px/16px "Verdana", Verdana;
}

#contact {
  background: #F9F9F9;
  padding: 25px;
  box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2), 0 5px 5px 0 rgba(0, 0, 0, 0.24);
  height:477px;
}

#contact h3 {
  display: block;
  font-family:Verdana;
  font-size: 24px;
  font-weight: 300;
  margin-bottom: 10px;
}

#contact h4 {
  margin: 5px 0 15px;
  display: block;
  font-family:Verdana;
  font-size: 13px;
  font-weight: 400;
}

#contact h5 {
  color:white;
  display: block;
  font-family:Verdana;
  font-size: 23px;
  font-weight: 300;
  margin-bottom: 10px;
}

.fieldset {
  border: medium none !important;
  margin: 0 0 10px;
  min-width: 100%;
  padding: 0;
  width: 100%;
}

#contact input[type="text"],
#contact input[type="email"],
#contact input[type="tel"],
#contact textarea {
  width: 100%;
  border: 1px solid #ccc;
  background: #FFF;
  margin: 0 0 5px;
  padding: 10px;
}

#contact input[type="text"]:hover,
#contact input[type="email"]:hover,
#contact input[type="tel"]:hover,
#contact textarea:hover {
  -webkit-transition: border-color 0.3s ease-in-out;
  -moz-transition: border-color 0.3s ease-in-out;
  transition: border-color 0.3s ease-in-out;
  border: 1px solid #aaa;
}

#contact textarea {
  height: 100px;
  max-width: 100%;
  resize: none;
}

#button{
  float:right;
  cursor: pointer;
  padding: 13px 32px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
}

#button:hover{
  background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}

#button:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

#contact input:focus,
#contact textarea:focus {
  outline: 0;
  border: 1px solid #aaa;
}

::-webkit-input-placeholder {
  color: #888;
}

:-moz-placeholder {
  color: #888;
}

::-moz-placeholder {
  color: #888;
}

:-ms-input-placeholder {
  color: #888;
}

.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 13px;
    font-size: 16px;
    width:125px;
    height:45px;
    border: none;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
input[type="file"]{
    display: none;
}
.custom-file-upload {
  cursor: pointer;
  padding: 13px 16px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
  display: inline-block;
  vertical-align: top;
  text-align: center;
}
.custom-file-upload:hover{
    background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}
.custom-file-upload:active{
box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}



.overlay {
    height: 477px;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0, 0.9);
    overflow-x: hidden;
    transition: 0.5s;
}

.overlay-content {
    position: relative;
    top: 5%;
    width: 100%;
    text-align: center;
    margin-top: 25px;
}

.overlay a {
    padding: 5px;
  margin-top:-15px;
    text-decoration: none;
    font-size: 36px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.overlay a:hover, .overlay a:focus {
    color: #f1f1f1;
}

.overlay .closebtn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 40px;
}

@media screen and (max-height: 450px) {
  .overlay a {font-size: 20px}
  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
}
#contact-submit{
  float:right;
  cursor: pointer;
  padding: 13px 32px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
}

#contact-submit:hover{
  background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}

#contact-submit:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}
#label{
  color:white;
  padding-left:25px;
  float:left;
  font-family:Verdana;
  font-size:13px;
}
#label2{
  color:white;
  padding-left:25px;
  float:left;
  font-family:Verdana;
  font-size:13px;
}

<div class="container">  
  <form id="contact" action="" method="post">
    <h3>Connect With HR</h3>
    <fieldset class="fieldset">
      <div class="dropdown">
  <button class="dropbtn">Location</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>

<div class="dropdown">
  <button class="dropbtn">Category</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>
    </fieldset>
    <fieldset class="fieldset">
      <textarea placeholder="Detail...." tabindex="2"></textarea>
    </fieldset>
      <h4>Contact Information</h4>
    <fieldset class="fieldset">
        <input placeholder="Name" type="text" tabindex="4">
        <input placeholder="Preferred Contact Number" type="tel" tabindex="5">
        <input placeholder="Preferred Email" type="email" tabindex="6">
    </fieldset>
    <filedset class="fieldset">
      <label for="file-upload" class="custom-file-upload">
    <i class="fa fa-cloud-upload"></i> Attachment
</label>
<input id="file-upload" type="file"/>
      <div id="myNav" class="overlay">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <div class="overlay-content">
    
    
    
    
    <div class="container">
        <form id="contact" action="" method="post">
      <fieldset class"fieldset">
        <h5>Summary</h5>
      </fieldset>
      <fieldset class="fieldset">
        <label id="label">Detail:</label>
        <label id="label2">Detail Information Here...</label>
      </fieldset>
   <!--  <fieldset class="fieldset">
      <button name="submit" type="submit" id="contact-submit" data-submit="...Sending">Submit</button>
    </fieldset>  -->
      </form>
    </div>
    
    
    
    
    
  </div>  
</div>  
<span id="button"" onclick="openNav()">Preview</span>
      <fieldset>
  </form>
</div>

Answer 1

您可以添加一个包含相关输入值的新label，然后将其innerHTML设置为您需要的值，因此:

• 将 id 添加到详细信息输入(占位符)(例如:id="txtDetail")
• 添加标签(在标签“Detail:”附近显示txtDetail的值

• 最后，在显示预览之前，将值从 txtDatail 复制到标签，例如:

  var input = document.getElementById("txtDetail");变量值=输入值；//<-- 从输入文本获取值var label = document.getElementById("labelDetail");label.innerHTML = 值；//<-- 在预览部分的标签中设置该值

请看下面的片段:

function openNav() {
    var input = document.getElementById("txtDetail");
    var value = input.value;
    var label = document.getElementById("labelDetail");
    label.innerHTML = value;
    document.getElementById("myNav").style.width = "100%";
}

function closeNav() {
    document.getElementById("myNav").style.width = "0%";
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: antialiased;
  -o-font-smoothing: antialiased;
  font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  margin: 0 auto;
  position: relative;
}

#contact input[type="text"],
#contact input[type="email"],
#contact input[type="tel"],
#contact textarea,
#contact button[type="submit"] {
  font: 400 12px/16px "Verdana", Verdana;
}

#contact {
  background: #F9F9F9;
  padding: 25px;
  box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2), 0 5px 5px 0 rgba(0, 0, 0, 0.24);
  height:477px;
}

#contact h3 {
  display: block;
  font-family:Verdana;
  font-size: 24px;
  font-weight: 300;
  margin-bottom: 10px;
}

#contact h4 {
  margin: 5px 0 15px;
  display: block;
  font-family:Verdana;
  font-size: 13px;
  font-weight: 400;
}

#contact h5 {
  color:white;
  display: block;
  font-family:Verdana;
  font-size: 23px;
  font-weight: 300;
  margin-bottom: 10px;
}

.fieldset {
  border: medium none !important;
  margin: 0 0 10px;
  min-width: 100%;
  padding: 0;
  width: 100%;
}

#contact input[type="text"],
#contact input[type="email"],
#contact input[type="tel"],
#contact textarea {
  width: 100%;
  border: 1px solid #ccc;
  background: #FFF;
  margin: 0 0 5px;
  padding: 10px;
}

#contact input[type="text"]:hover,
#contact input[type="email"]:hover,
#contact input[type="tel"]:hover,
#contact textarea:hover {
  -webkit-transition: border-color 0.3s ease-in-out;
  -moz-transition: border-color 0.3s ease-in-out;
  transition: border-color 0.3s ease-in-out;
  border: 1px solid #aaa;
}

#contact textarea {
  height: 100px;
  max-width: 100%;
  resize: none;
}

#button{
  float:right;
  cursor: pointer;
  padding: 13px 32px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
}

#button:hover{
  background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}

#button:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

#contact input:focus,
#contact textarea:focus {
  outline: 0;
  border: 1px solid #aaa;
}

::-webkit-input-placeholder {
  color: #888;
}

:-moz-placeholder {
  color: #888;
}

::-moz-placeholder {
  color: #888;
}

:-ms-input-placeholder {
  color: #888;
}

.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 13px;
    font-size: 16px;
    width:125px;
    height:45px;
    border: none;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
input[type="file"]{
    display: none;
}
.custom-file-upload {
  cursor: pointer;
  padding: 13px 16px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
  display: inline-block;
  vertical-align: top;
  text-align: center;
}
.custom-file-upload:hover{
    background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}
.custom-file-upload:active{
box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}



.overlay {
    height: 477px;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0, 0.9);
    overflow-x: hidden;
    transition: 0.5s;
}

.overlay-content {
    position: relative;
    top: 5%;
    width: 100%;
    text-align: center;
    margin-top: 25px;
}

.overlay a {
    padding: 5px;
  margin-top:-15px;
    text-decoration: none;
    font-size: 36px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.overlay a:hover, .overlay a:focus {
    color: #f1f1f1;
}

.overlay .closebtn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 40px;
}

@media screen and (max-height: 450px) {
  .overlay a {font-size: 20px}
  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
}
#contact-submit{
  float:right;
  cursor: pointer;
  padding: 13px 32px;
  width:125px;
  height:45px;
  border: none;
  font-family:Verdana;
  background: #4CAF50;
  color: #FFF;
  margin: 0 0 5px;
  font-size: 15px;
}

#contact-submit:hover{
  background: #43A047;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}

#contact-submit:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}
#label{
  color:white;
  padding-left:25px;
  float:left;
  font-family:Verdana;
  font-size:13px;
}
#labelDetail{
  color:white;
  padding-left:25px;
  float:left;
  font-family:Verdana;
  font-size:13px;
}
#label2{
  color:white;
  padding-left:25px;
  float:left;
  font-family:Verdana;
  font-size:13px;
}

<div class="container">  
  <form id="contact" action="" method="post">
    <h3>Connect With HR</h3>
    <fieldset class="fieldset">
      <div class="dropdown">
  <button class="dropbtn">Location</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>

<div class="dropdown">
  <button class="dropbtn">Category</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>
    </fieldset>
    <fieldset class="fieldset">
      <textarea id="txtDetail" placeholder="Detail...." tabindex="2"></textarea>
    </fieldset>
      <h4>Contact Information</h4>
    <fieldset class="fieldset">
        <input placeholder="Name" type="text" tabindex="4">
        <input placeholder="Preferred Contact Number" type="tel" tabindex="5">
        <input placeholder="Preferred Email" type="email" tabindex="6">
    </fieldset>
    <filedset class="fieldset">
      <label for="file-upload" class="custom-file-upload">
    <i class="fa fa-cloud-upload"></i> Attachment
</label>
<input id="file-upload" type="file"/>
      <div id="myNav" class="overlay">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <div class="overlay-content">
    
    
    
    
    <div class="container">
        <form id="contact" action="" method="post">
      <fieldset class"fieldset">
        <h5>Summary</h5>
      </fieldset>
      <fieldset class="fieldset">
        <label id="label">Detail:</label>
        <label id="labelDetail"></label>
        <label id="label2">Detail Information Here...</label>
      </fieldset>
   <!--  <fieldset class="fieldset">
      <button name="submit" type="submit" id="contact-submit" data-submit="...Sending">Submit</button>
    </fieldset>  -->
      </form>
    </div>
    
    
    
    
    
  </div>  
</div>  
<span id="button"" onclick="openNav()">Preview</span>
      <fieldset>
  </form>
</div>

希望对你有帮助，再见。