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

Question

Using this code, how to expand and collapse..toggle all el-collapse-items of ElementPlusVue3 library with one button?

P粉347804896 · Answer

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')


sssccc
sssccc


  
    toggle all
  
  
    
      
        
          {{ item.text }}

P粉251903163 · Answer

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 el-collapse-item/ em> component or empty, for example

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