Javascript - Uncaught TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'

2022-05-06 20:56 user9741470 imported from Stackoverflow

I have this code in my vue component

<template>
  <div class="container-fluid p-0">
    <div class="row m-0">
      <div class="col-12 vh-100 p-0" @drop="drop($event)" @dragover.prevent id="camView">
        <canvas class="position-absolute top-0 end-0" ref="targetImg" id="targetImg"></canvas>
        <div class="position-absolute" id="selection" draggable="true" @dragstart="drag($event)"></div>
        <img src="@/assets/lu.jpeg" class="img-fluid" id="srcImg" ref="srcImg">
      </div>
    </div>
  </div>
</template>

<script>

export default {
  name: 'DropView',
  data() {
    return {

    }
  },
  mounted() {
 
  },
  methods: {
    drag(e) {
      console.log(e)
      e.dataTransfer.setData('text', e.target.id);
    },
    drop(e) {
      console.log(e)
      e.preventDefault();
      let data = e.dataTransfer.getData('text');
      console.log(data)
      let box = document.getElementById(data)
      console.log(box)
      e.target.appendChild(box);
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="scss">
.col-12 {
  #selection {
    width: 360px;
    height: 240px;
    border-style: dashed;
    border-width: 1px;
    border-color: white;
    background-color: transparent;
    z-index: 1;
  }
  #target-img {
    overflow: hidden;
    width: 320px;
    height: 240px;
    z-index: 1;
  }
  #srcImg {
    height: 100%;
    display: block;
    width: 100%;
    object-fit: cover;
  }
}
</style>

I'm trying to use drag and drop to moove a div that is positioned on top of an image. I'm able to start the drag operation but when I release the div into another position I will get this error in console

Vue warn]: Unhandled error during execution of native event handler 
Uncaught TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.

I've noticed that the div will disappear and is not mooved. Is there any fix?

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Creating Sticky Navbar with Drop Down Menu HTML

I am creating a HTML web page which contains a sticky navbar with drop down menu. However, when I created one, the dropdown menu does not works in the sticky navbar and so goes vise versa. below is the screenshot of both the result of the two codes.

*image with dropdown menu but without sticky navbar

*image with sticky navbar but without dropdown menu

below is the code for "image with dropdown menu but without sticky navbar"

    <!DOCTYPE html>
    <html>
    <head>
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-    awesome/4.7.0/css/font-awesome.min.css">
    <style>
    body {margin:0;font-family:Arial}

   .topnav {
    overflow: hidden;
    background-color: #333;
  }

  .topnav a {
    list-style-type: none;
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
    position: sticky;
  }



  .active {
    background-color: #04AA6D;
    color: white;
  }

  .topnav .icon {
    display: none;
  }

  .dropdown {
    float: left;
    overflow: hidden;
  }

  .dropdown .dropbtn {
    font-size: 17px;    
    border: none;
    outline: none;
    color: white;
    padding: 14px 16px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;
  }

  .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 {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
  }

  .topnav a:hover, .dropdown:hover .dropbtn {
    background-color: #555;
    color: white;
  }

  .dropdown-content a:hover {
    background-color: #ddd;
    color: black;
  }

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

  @media screen and (max-width: 600px) {
    .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
    .topnav a.icon {
      float: right;
      display: block;
    }
  }

  @media screen and (max-width: 600px) {
    .topnav.responsive {position: relative;}
    .topnav.responsive .icon {
      position: absolute;
      right: 0;
      top: 0;
    }
    .topnav.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
    .topnav.responsive .dropdown {float: none;}
    .topnav.responsive .dropdown-content {position: relative;}
    .topnav.responsive .dropdown .dropbtn {
      display: block;
      width: 100%;
      text-align: left;
    }
  }
  </style>
  </head>
  <body>
        <div class="header">
        <h2>Scroll Down</h2>
    <p>Scroll down to see the sticky effect.</p>
  </div>

  <div class="topnav" id="myTopnav">
    <a href="#home" class="active">Home</a>
    <a href="#news">News</a>
    <a href="#contact">Contact</a>
    <div class="dropdown">
      <button class="dropbtn">Dropdown 
        <i class="fa fa-caret-down"></i>
      </button>
      <div class="dropdown-content">
        <a href="#">Link 1</a>
        <a href="#">Link 2</a>
        <a href="#">Link 3</a>
      </div>
    </div> 
    <a href="#about">About</a>
    <a href="javascript:void(0);" style="font-size:15px;" class="icon"     onclick="myFunction()">&#9776;</a>
  </div>

  <div style="padding-left:16px">
    <h2>Responsive Topnav with Dropdown</h2>
    <p>Resize the browser window to see how it works.</p>
    <p>Hover over the dropdown button to open the dropdown menu.</p>
  </div>

  <h3>Sticky Navigation Bar Example</h3>
  <p>The navbar will <strong>stick</strong> to the top when you reach its scroll position.</p>
  <p><strong>Note:</strong> Internet Explorer do not support sticky positioning and Safari         requires a -webkit- prefix.</p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>
  <p>Some text to enable scrolling. </p>


  <script>
  function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
      x.className += " responsive";
    } else {
      x.className = "topnav";
    }
  }
  </script>

  </body>
  </html>

below is the code for "image with sticky navbar but without dropdown menu"

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-    awesome/4.7.0/css/font-awesome.min.css">
<style>


body {
  font-size: 20px;
}
body {margin:0;}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
  position: -webkit-sticky; /* Safari */
  position: sticky;
  top: 0;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 16px 20px;
  text-decoration: none;
}

li a:hover {
  background-color: #111;
}
    
/*======================================================================*/

body {
  background-color:white;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #38444d;
}

li {
  float: left;
}

li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

li.dropdown {
  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;
  text-align: left;
}

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

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


footer {
  text-align: center;
  padding: 3px;
  background-color: DarkSalmon;
  color: white;
}

</style>
</head>
<body>

<div class="header">
  <h2>Scroll Down</h2>
  <p>Scroll down to see the sticky effect.</p>
</div>

<ul>
  <li><a href="#home">Home</a></li>
    <li><a href="#news">News</a></li>
    <li class="dropdown">
      <a href="javascript:void(1)" class="dropbtn">Dropdown</a>
      <div class="dropdown-content">
        <a href="#">Link 1</a>
        <a href="#">Link 2</a>
        <a href="#">Link 3</a>
      </div>
    </li>
</ul>

<h3>Sticky Navigation Bar Example</h3>
<p>The navbar will <strong>stick</strong> to the top when you reach its scroll position.</p>
<p><strong>Note:</strong> Internet Explorer do not support sticky positioning and Safari requires a -webkit- prefix.</p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>
<p>Some text to enable scrolling. </p>


<footer>
  <p>Author: Hege Refsnes<br>
  <a href="mailto:hege@example.com">hege@example.com</a></p>
</footer>


</body>
</html>

Please i need some help with this as i am new to html and css.

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