4dkankan-components/docs/examples-bk/cascader/dynamic-loading.vue

<template>
    <el-cascader :props="props" />
</template>

<script lang="ts" setup>
let id = 0
const props = {
    lazy: true,
    lazyLoad(node, resolve) {
        const { level } = node
        setTimeout(() => {
            const nodes = Array.from({ length: level + 1 }).map(item => ({
                value: ++id,
                label: `Option - ${id}`,
                leaf: level >= 2,
            }))
            // Invoke `resolve` callback to return the child nodes data and indicate the loading is finished.
            resolve(nodes)
        }, 1000)
    },
}
</script>