How to expand or collapse all el-collapse-item of ElementPlus Vue3 library with one button?

Question

With this code, how to expand and collapse..toggle all el-collapse-items of ElementPlus Vue3 library with one button?

<template>
<div class="demo-collapse">
<el-collapse v-model="activeName" accordion>
  <el-collapse-item title="Consistency" name="1">

<script lang="ts" setup>
import { ref } from 'vue'

const activeName = ref('1')
</script>

https://element-plus.org/en-US/component/collapse.html#accordion

Answer 1

Please take a look at the following code snippet:

const { ref } = Vue

const app = Vue.createApp({
  setup() {
    const items = ref([{id: 1, title: "first", text: "aaaaaaaaaaaa"}, {id: 2, title: "second", text: "bbbbbbbbbbbb"}, {id: 3, title: "third", text: "ccccccccccc"}])
    const activeName = ref([1]);
    const toggleAll = () => {
      activeName.value = activeName.value.length === items.value.length 
        ? [] 
        : items.value.map(i => i.id)
    }
    return { items, activeName, toggleAll };
  },
})
app.use(ElementPlus);
app.mount('#demo')

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    toggle all
  
  

    
      
        

          {{ item.text }}
        
      
    
  

Answer 2

You cannot perform this operation in Accordion mode. As the documentation states:

To do this, you have to remove the accordion attribute and change the activeName value to an array, like in the documentation:

const activeNames = ref(['1'])

To expand/collapse all items, you can create a function that will change the value of activeNames to include all names of < 的所有el-collapse-item</ em> component or empty, for example

toggleElements() {
  if(activeName.value.length) {
    activeName.value = [];
  } else {
    activeName.value = ['1', '2', '3', ...];
  }
}