element 树结构 一键展开

 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>

</style>

<body>
    <div id="app">
        <el-button type="primary" @click="handleExpand($event)">一键展开</el-button>
        <el-button type="primary" @click="handleExpand(null)">一键收起</el-button>
        <el-tree ref="tree" :data="treeData" show-checkbox node-key="id" default-expand-all :props="defaultProps">

        </el-tree>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>
    <script>

        var app = new Vue({
            el: '#app',
            data: {
                treeData: [{
                    id: 1,
                    label: '一级 1',
                    children: [{
                        id: 4,
                        label: '二级 1-1',
                        children: [{
                            id: 9,
                            label: '三级 1-1-1'
                        }, {
                            id: 10,
                            label: '三级 1-1-2'
                        }]
                    }]
                }, {
                    id: 2,
                    label: '一级 2',
                    children: [{
                        id: 5,
                        label: '二级 2-1'
                    }, {
                        id: 6,
                        label: '二级 2-2'
                    }]
                }],

                defaultProps: {
                    children: 'children',
                    label: 'label'
                }
            },

            mounted() { },


            methods: {
                handleExpand(value) {
                    console.log('value: ', value);
                    let treeList = this.treeData
                    this.treeData.map((itemm, index) => {
                        this.$refs.tree.store.nodesMap[treeList[index].id].expanded = value
                        this.$refs.tree.root.expanded = value
                    })

                },

            }
        })

    </script>
</body>

</html>

 

posted @ 2022-10-09 16:00  牧羊少年&  阅读(103)  评论(0)    收藏  举报