javascript - Vue $refs 为什么无法获取组件对象

问题描述

<el-tree ref='permissions_tree' :data='permissions' :props='basicConfig.defaultProps' show-checkbox node-key='id' :render-content='renderNode'></el-tree>

mounted () { console.log(this.$refs.permissions_tree);}

在 mounted 中打印输出的是undefined！这是为什么？

我在表格中渲染的按钮，第一次点击调用 console.log(this.$refs.permissions_tree);得到的也是 undefined，第二次就能正常获取到组件了

{ title: ’操作’, key: ’action’, align: ’center’, render: (h, params) => { return h(’p’, [h(’Button’, { props: { type: ’primary’, size: ’small’ }, style: { marginRight: ’5px’ }, on: { click: () => { this.userForm.staffid = params.row.staffid; this.userForm.name = params.row.name; this.userForm.phoneticize = params.row.phoneticize; this.userForm.gender = params.row.gender; this.userForm.mobile = params.row.mobile; this.userForm.telephone = params.row.telephone; this.userForm.identification = params.row.identification; this.userForm.positions = params.row.positions; this.userForm.permissions = params.row.permissions; this.userFormShow = true; console.log(this.$refs.permissions_tree); //这里 } }}, ’编辑’) ]); }}

问题解答

可能你用v-if来切换组件展示，所以要在下一个tick才能获取到

this.$nextTick(() => { console.log(this.$refs.permissions_tree);});回答2：

写在

this.$nextTick(() => {})

里试一下

外层组件是不是使用了v-if，换成v-show 试一下

调用这个方法this.$nextTick(function () {

// 里面打印 })