4dkankan-components/docs/examples/tree-select/lazy.vue

<template>
    <el-tree-select v-model="value" lazy :load="load" :props="props" />
</template>

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

const value = ref()

const props = {
    label: 'label',
    children: 'children',
    isLeaf: 'isLeaf',
}

let id = 0

const load = (node, resolve) => {
    if (node.isLeaf) return resolve([])

    setTimeout(() => {
        resolve([
            {
                value: ++id,
                label: `lazy load node${id}`,
            },
            {
                value: ++id,
                label: `lazy load node${id}`,
                isLeaf: true,
            },
        ])
    }, 400)
}
</script>