将Javascript值转换为链接？

Question

如何将用户输入转换为模态框内的可点击链接？ （用户条目将采用 URL 格式，例如 www.bbc.co.uk）。我使用的代码完全来自 w3c 学校，并且正在试验如何优化模块。 我在下面添加了代码。

  <br><b>URL</b> <input type="text" size="40" value="" name="url" id="url" class="form-control" title="Enter the URL of a web page" onchange="displayURL()">

<br><br><br><br><br>
<style>
/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    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 */
    font-family: foco;
    
}

/* Modal Content */
.modal-content {
    position: relative;
    background-color: white;
    margin: auto;
    font-size: 15px;
    padding: 0;
    border: 1px solid #888;
    width: 40%;
    
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    -webkit-animation-name: animatetop;
    -webkit-animation-duration: 0.3s;
    animation-name: animatetop;
    animation-duration: 0.3s
    
}

/* Add Animation */
@-webkit-keyframes animatetop {
    from {top:-300px; opacity:0} 
    to {top:0; opacity:1}
}

@keyframes animatetop {
    from {top:-300px; opacity:0}
    to {top:0; opacity:1}
}

/* The Close Button */
.close {
    color: white;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}

.modal-header {
    padding: 2px 16px;
    background-color: #4286f4;
    color: white;
}

.modal-body {padding: 2px 16px;}


}
</style>



<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h2>DEMO</h2>
    </div>
    <div class="modal-body">
      <p>Click on the link:</p>
      <p id="skkr"></p>
      <a id="skkr" href="IM LOST"></a>
      <script>
function displayURL() {
    document.getElementById("skkr").innerHTML = 
document.getElementById("url").value;
}

</script>

    </div>
   
  </div>

</div>

<script>
// 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";
    }
}
</script>

谢谢

Answer 1

其实很简单，你要把输入框读取的数据放到一个锚标签中：

  <br><b>URL</b> <input type="text" size="40" value="" name="url" id="url" class="form-control" title="Enter the URL of a web page" onchange="displayURL()">

<br><br><br><br><br>
<style>
/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    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 */
    font-family: foco;
    
}

/* Modal Content */
.modal-content {
    position: relative;
    background-color: white;
    margin: auto;
    font-size: 15px;
    padding: 0;
    border: 1px solid #888;
    width: 40%;
    
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    -webkit-animation-name: animatetop;
    -webkit-animation-duration: 0.3s;
    animation-name: animatetop;
    animation-duration: 0.3s
    
}

/* Add Animation */
@-webkit-keyframes animatetop {
    from {top:-300px; opacity:0} 
    to {top:0; opacity:1}
}

@keyframes animatetop {
    from {top:-300px; opacity:0}
    to {top:0; opacity:1}
}

/* The Close Button */
.close {
    color: white;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}

.modal-header {
    padding: 2px 16px;
    background-color: #4286f4;
    color: white;
}

.modal-body {padding: 2px 16px;}


}
</style>



<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h2>DEMO</h2>
    </div>
    <div class="modal-body">
      <p>Click on the link:</p>
      <p id="skkr"></p>
      <a id="skkr" href="IM LOST"></a>
      <script>
function displayURL() {
    var readValue=document.getElementById("url").value;
    document.getElementById("skkr").innerHTML = '<a href="'+readValue+'">'+readValue+'</a>';
}

</script>

    </div>
   
  </div>

</div>

<script>
// 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";
    }
}
</script>

重要的部分是：

var readValue=document.getElementById("url").value;
document.getElementById("skkr").innerHTML = '<a href="'+readValue+'">'+readValue+'</a>';

Answer 2

W3 Schools 有一个很好的小演示就是为了这个东西。

<!DOCTYPE html>
<html>
<body>

<p>Click the button to display a string as a hyperlink.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var str = "Free Web Building Tutorials!";
    var result = str.link("https://www.w3schools.com");
    document.getElementById("demo").innerHTML = result;
}
</script>

</body>
</html>

https://www.w3schools.com/jsref/jsref_link.asp 供参考将进一步指导您。

希望您能从所提供的示例中找出如何使用您的用户输入来更新您的元素。

Answer 3

您有两个 id 为“skkr”的元素。错了。

从这一行中删除 id 'skkr' <p id="skkr"></p>

接下来，像这样更新函数 displayURL()：

var link = document.getElementById("skkr");
var url = document.getElementById("url").value;
link.setAttribute("href",url);
link.innerHTML = url;