angular.js - Automatically generate a div that can be clicked to expand based on the number of children in the data

Question

The data is as shown in the figure: Based on the obtained data, the following effect should be made: the outermost parent is always displayed, and its children are displayed after clicking. If the child has children, it can be expanded after clicking...

伊谢尔伦 · Answer

<pre class='brush:php;toolbar:false;'><code><!DOCTYPE html> 
<html>
    <head>
        <meta charset="utf-8" />
        <style type="text/css">
            .list {
                margin: 0;
                padding-left: 20px;
            }
            
            .list li {
                list-style: none;
            }
            
            .hide {
                display: none;
            }
            
            .control ~ .control-label {
                display: inline-block;
                width: 0;
                height: 0;
                border: 6px solid transparent;
                border-left-color: #000;
            }
            
            .control:checked ~ .control-label {
                border-left-color: transparent;
                border-top-color: #000;
            }
            
            .control ~ .list {
                display: none;
            }
            
            .control:checked ~ .list {
                display: block;
            }
            
            .control-label::after {
                content: attr(data-title);
                display: block;
                margin-top: -6px;
                margin-left: 0.5em;
                width: 10em;
                font-size: 12px;
                line-height: 12px;
            }
        </style>
    <head>
    <body>
        <script>
            function createItem(data) {
                var id = (Math.random()).toString(16).slice(2);
                    
                var p   = document.createElement('p');
                    p.className = 'content';
                var input = document.createElement('input');    
                    input.type = 'checkbox';
                    input.className = 'hide control';
                    input.id = 'control-' + id;
                    
                var label = document.createElement('label');
                    label.className = 'control-label';
                    label.setAttribute('for','control-' + id);
                    label.dataset.title = '[' + data.Code + ']' + data.Name;
                        
                p.appendChild(input);
                p.appendChild(label);
                    
                return p;
            }
                
            function createTree(data) {
                var ul = document.createElement('ul');
                    ul.className = 'list';
                    
                for(var i = 0,len = data.length; i < len; i++) {
                    var li = document.createElement('li');
                    var p = createItem(data[i]);
                        
                    li.appendChild(p);
                        
                    if(data[i].children && data[i].children.length > 0) {
                        p.appendChild(createTree(data[i].children));
                    }
                        
                    ul.appendChild(li);
                }
                    
                return ul;
            }
                
            var elems = createTree(data);
                
            document.body.appendChild(elems);
        </script>
    </body>
</html></code></pre>