Question

我正在尝试将图像拖放到div上。图像不会被拖到div上并给出以下错误

Uncaught TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.draganddrop.html:20 dropdraganddrop.html:26 ondrop

代码

  <!DOCTYPE HTML>
  <html>
     <head>
        <meta charset="utf-8">
        <title>Creativity Dashboard</title>

        <!-- Required CSS -->
        <link href="css/movingboxes.css" rel="stylesheet">
        <link href="css/compare.css" rel="stylesheet">

        <!--[if lt IE 9]>
           <link href="css/movingboxes-ie.css" rel="stylesheet" media="screen">
        <![endif]-->

        <!-- Required script -->
        <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
        <script src="js/jquery.movingboxes.js"></script>

        <!-- Demo only -->
        <link href="demo/demo.css" rel="stylesheet">
        <script src="demo/demo.js"></script>

        <script>
           function allowDrop(ev) {
              ev.preventDefault();
           }

           function drag(ev) {
              ev.dataTransfer.setData("text", ev.target.id);
           }

           function drop(ev) {
              ev.preventDefault();
              var data = ev.dataTransfer.getData("text");
              ev.target.appendChild(document.getElementById(data));
           }
        </script>
        <style>
           /* Overall & panel width defined using css in MovingBoxes version 2.2.2+ */
           #slider-one {
              width: 1003px;
           }

           #slider-one>li {
              width: 150px;
           }
        </style>
     </head>

     <body>
        <div class="wrapper">
           <!-- Slider #1 -->
           <ul id="slider-one">

              <li><img id="drag1" src="demo/1.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

              <li><img id="drag2" src="demo/2.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

              <li><img id="drag3" src="demo/3.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

              <li><img id="drag5" src="demo/4.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

              <li><img id="drag6" src="demo/5.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

              <li><img id="drag7" src="demo/6.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture" id="astronaut"></li>

              <li><img id="drag8" src="demo/7.jpg" draggable="true"
                 ondragstart="drag(event)" alt="picture"></li>

           </ul>
           <!-- end Slider #1 -->
           <div id="dragAnddrop" ondrop="drop(event)"
              ondragover="allowDrop(event)" style="width: 12em; height: 12em">
           </div>
        </div>

        <div>
           <div class="left">
              <img id="drag" draggable="true" ondragstart="drag(event)"
                 src="images/startingImage.jpg" style="width: 12em;" alt="picture">

           </div>
           <div class="middle ">
              <img id="image3" src="images/startingImage.jpg" class="image-size"
                 alt="picture" draggable="true" ondragstart="drag(event)"> <img
                 src="images/harvest.jpg" class="image-size" alt="picture">
           </div>
           <div class="right">
              <img src="images/startingImage.jpg" style="width: 12em;"
                 alt="picture">
           </div>
        </div>
     </body>
  </html>

Answer 1

这实际上是一个简单的答案。

您的函数返回的是字符串而不是div节点。 appendChild只能附加一个节点。

例如，如果您尝试appendChild字符串：

var z = '<p>test satu dua tiga</p>'; // is a string 
document.body.appendChild(z);

以上代码永远不会有效。将起作用的是：

var z = document.createElement('p'); // is a node
z.innerHTML = 'test satu dua tiga';
document.body.appendChild(z);

Answer 2

如果您不小心拖动了已分配id的元素（例如，您正在拖动周围的元素），则会发生这种情况。在这种情况下，ID为空，函数drag（）分配一个空值，然后传递给drop（）并在那里失败。

尝试将id分配给所有元素，包括tds，div或可拖动元素周围的任何元素。

Answer 3

在我的情况下，我没有调用appendChild的字符串，我传递divel.appendChild(childel[0])参数的对象是错误的，它是一个数组，我传递了一个元素对象，所以我使用了divel.appendChild(childel)而不是export const ROUTES: RouteInfo[] = [ { path: '/dashboard', title: 'Dashboard', icon: 'fa fa-tachometer', class: '' ,name:'',src:"../../../../assets/images/header-icon.png",srcOn:"../../../../assets/images/dashboard_highlighted.png"}, { path: '/forms', title: 'Forms', icon:'fa fa-eyedropper', class: '',name:'',src:"../../../../assets/images/dashboard_highlighted.png",srcOn:""}, { path: '/tables', title: 'Desk Blotter', icon:'fa fa-pencil', class: '' ,name:'',src:"../../../../assets/images/dashboard_highlighted.png",srcOn:""}, { path: '/bs-element', title: 'Admin', icon:'fa fa-picture-o', class: '' ,name:'',src:"../../../../assets/images/dashboard_highlighted.png",srcOn:""}, { path: '/login', title: 'Logout', icon:'fa fa-power-off', class: '',name:'',src:"../../../../assets/images/dashboard_highlighted.png",srcOn:"" }, ]; <li *ngFor="let menuItem of menuItems" routerLinkActive="active" class="{{menuItem.class}}" > <a [routerLink]="[menuItem.path]" name="{{menuItem.name}}"> <img src="{{menuItem.src}}" style="width:66%;" (mouseenter)="'src=''{{menuItem.srcOn}}'" id="{{menuItem.title}}"/> {{menuItem.title}} </a> </li>而且效果很好。希望它对某人有所帮助。

Answer 4

您也可以使用element.insertAdjacentHTML('beforeend', data);

请阅读MDN上的“安全注意事项”。

Answer 5

使用ondragstart(event)代替ondrag(event)

错误：无法执行＆＃39; appendChild＆＃39; on＆＃39;节点＆＃39;：参数1不是类型＆＃39;节点＆＃39;

5 个答案: