el-cascader

Cascader Component

Cascader displays and selects options with clear hierarchical structure.

When to Use

• Region/location selection
• Category hierarchies
• Organizational structures
• Multi-level navigation

Basic Usage

<template>
  <el-cascader v-model="value" :options="options" />
</template>

## Multiple Selection

```vue
<template>
  <el-cascader v-model="value" :options="options" :props="props" clearable />
</template>

<script setup>
import { ref } from 'vue'

const value = ref([])
const props = { multiple: true }
</script>

Select Any Level

<template>
  <el-cascader v-model="value" :options="options" :props="{ checkStrictly: true }" />
</template>

Dynamic Loading

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

<script setup>
const props = {
  lazy: true,
  lazyLoad(node, resolve) {
    const { level } = node
    setTimeout(() => {
      const nodes = Array.from({ length: level + 1 }).map((item, i) => ({
        value: `${level}-${i}`,
        label: `Option ${level}-${i}`,
        leaf: level >= 2
      }))
      resolve(nodes)
    }, 1000)
  }
}
</script>

Filterable

<template>
  <el-cascader v-model="value" :options="options" filterable />
</template>

API Reference

Cascader Attributes

Name	Description	Type	Default
model-value / v-model	Binding value	string | number | array	—
options	Data of options	CascaderOption[]	—
props	Configuration options	CascaderProps	—
size	Size of input	'large' | 'default' | 'small'	—
placeholder	Placeholder	string	—
disabled	Whether disabled	boolean	—
clearable	Whether clearable	boolean	—
show-all-levels	Display all levels	boolean	true
collapse-tags	Collapse tags in multiple mode	boolean	—
separator	Option label separator	string	' / '
filterable	Whether searchable	boolean	—

CascaderProps

Name	Description	Type	Default
expandTrigger	Expand trigger mode	'click' | 'hover'	'click'
multiple	Enable multiple selection	boolean	false
checkStrictly	Parent-child independent	boolean	false
emitPath	Emit path array	boolean	true
lazy	Enable lazy loading	boolean	false
lazyLoad	Lazy load method	(node, resolve) => void	—
value	Value key	string	'value'
label	Label key	string	'label'
children	Children key	string	'children'

Events

Name	Description
change	Value changes
expand-change	Expand changes
blur	Blur event
focus	Focus event

Best Practices

1. Use checkStrictly for selecting any level
2. Use lazy loading for large datasets
3. Use filterable for searchable cascaders