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Restrict the drag-and-drop for particular tree nodes

You can able to restrict to drag and drop files under folder only. These can be achieved by using ‘nodeDragStop’ and ‘nodeDragging’ event of TreeView.

Source
Preview
index.js
index.html
index.css
ej.base.enableRipple(true);

    // Hierarchical data source for TreeView component
    var hierarchicalData = [
        {
            nodeId: '01', nodeText: 'Music', icon: 'folder', 
            nodeChild: [
                { nodeId: '01-01', nodeText: 'Gouttes.mp3', icon: 'audio' }
            ]
        },
        {
            nodeId: '02', nodeText: 'Videos', icon: 'folder',
            nodeChild: [
                { nodeId: '02-01', nodeText: 'Naturals.mp4', icon: 'video' },
                { nodeId: '02-02', nodeText: 'Wild.mpeg', icon: 'video' },
            ]
        },
        {
            nodeId: '03', nodeText: 'Documents', icon: 'folder',
            nodeChild: [
                { nodeId: '03-01', nodeText: 'Environment Pollution.docx', icon: 'docx' },
                { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx', icon: 'docx' },
                { nodeId: '03-03', nodeText: 'Global Warming.ppt', icon: 'ppt' },
                { nodeId: '03-04', nodeText: 'Social Network.pdf', icon: 'pdf' },
                { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf', icon: 'pdf' },
            ]
        },
        {
            nodeId: '04', nodeText: 'Pictures', icon: 'folder', expanded: true,
            nodeChild: [
                {
                    nodeId: '04-01', nodeText: 'Camera Roll', icon: 'folder', expanded: true,
                    nodeChild: [
                        { nodeId: '04-01-01', nodeText: 'WIN_20160726_094117.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/9.png' },
                        { nodeId: '04-01-02', nodeText: 'WIN_20160726_094118.JPG', image: 'https://ej2.syncfusion.com/demos/src/treeview/images/employees/3.png' },
                    ]
                },
                { nodeId: '04-02', nodeText: 'Wind.jpg', icon: 'images' },
                { nodeId: '04-03', nodeText: 'Stone.jpg', icon: 'images' },
            ]
        },
        {
            nodeId: '05', nodeText: 'Downloads', icon: 'folder',
            nodeChild: [
                { nodeId: '05-01', nodeText: 'UI-Guide.pdf', icon: 'pdf' },
                { nodeId: '05-02', nodeText: 'Tutorials.zip', icon: 'zip' },
                { nodeId: '05-03', nodeText: 'Game.exe', icon: 'exe' },
                { nodeId: '05-04', nodeText: 'TypeScript.7z', icon: 'zip' },
            ]
        },
    ];

    // Render the TreeView with image icons
    var treeObj = new ej.navigations.TreeView({
        fields: { dataSource: hierarchicalData, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' },
        sortOrder: 'Ascending',
        allowDragAndDrop: true,
        nodeDragStop: dragStop,
        nodeDragging: nodeDrag 
    });
    treeObj.appendTo('#tree');

function nodeDrag(args) {
    if (args.droppedNode.getElementsByClassName('folder').length === 0) args.dropIndicator = 'e-no-drop';
}

function dragStop(args) {
    if (args.droppedNode.getElementsByClassName('folder').length === 0) args.cancel = true;
}
<html lang="en"><head><script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head><body>&#xFEFF;



    <title>Essential JS 2 for TreeView </title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Essential JS 2 for TreeView UI Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    
    



    
    <div id="container">
        <div id="treeparent">
            <div id="tree"></div>
        </div>
    </div>
    <style>
        .e-treeview .e-list-img {
            width: 25px;
            height: 25px;
        }

        /* Loading sprite image for TreeView */
        .e-treeview .e-list-icon {
            background-repeat: no-repeat;
            background-image: url(https://ej2.syncfusion.com/demos/src/treeview/images/icons/file_icons.png);
            height: 20px;
        }

            /* Specify the icon positions based upon class name */
            .e-treeview .e-list-icon.folder {
                background-position: -10px -552px;
            }

            .e-treeview .e-list-icon.docx {
                background-position: -10px -20px;
            }

            .e-treeview .e-list-icon.ppt {
                background-position: -10px -48px;
            }

            .e-treeview .e-list-icon.pdf {
                background-position: -10px -104px;
            }

            .e-treeview .e-list-icon.images {
                background-position: -10px -132px;
            }

            .e-treeview .e-list-icon.zip {
                background-position: -10px -188px;
            }

            .e-treeview .e-list-icon.audio {
                background-position: -10px -244px;
            }

            .e-treeview .e-list-icon.video {
                background-position: -10px -272px;
            }

            .e-treeview .e-list-icon.exe {
                background-position: -10px -412px;
            }
    </style>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
    visibility: hidden;
}

#loader {
    color: #008cff;
    height: 40px;
    width: 30%;
    position: absolute;
    font-family: 'Helvetica Neue','calibiri';
    font-size: 14px;
    top: 45%;
    left: 45%;
}

#treeparent {
    display: block;
    max-width: 350px;
    max-height: 350px;
    margin: auto;
    overflow: auto;
    border: 1px solid #dddddd;
    border-radius: 3px;
}