<template>
    <div class="content">
        <e-row :gutter="24">
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>基本用法</span>
                    </div>
                    <div>
                        <div class="block">
                          <!-- <e-button @click="getCheckedNodes('cascader')">getCheckedNodes</e-button>  -->
                            <span class="demonstration">默认 click 触发子菜单</span>
                            <e-cascader
                                ref="cascader"
                                v-model="value"
                                :options="options"
                                @change="handleChange"></e-cascader>
                            </div>
                            <div class="block">
                            <span class="demonstration">hover 触发子菜单</span>
                            <e-cascader
                                v-model="value"
                                :options="options"
                                :props="{ expandTrigger: 'hover' }"
                                @change="handleChange"></e-cascader>
                        </div>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>禁用选项</span>
                    </div>
                    <div>
                        <e-cascader :options="options"></e-cascader>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>可清空</span>
                    </div>
                    <div>
                        <e-cascader :options="options" clearable></e-cascader>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>仅显示最后一级</span>
                    </div>
                    <div>
                        <e-cascader :options="options" :show-all-levels="false"></e-cascader>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>多选</span>
                    </div>
                    <div>
                        <div class="block">
                            <span class="demonstration">默认显示所有Tag</span>
                            <e-cascader
                                :options="options2"
                                :props="props"
                                clearable></e-cascader>
                            </div>
                            <div class="block">
                            <span class="demonstration">折叠展示Tag</span>
                            <e-cascader
                                :options="options2"
                                :props="props"
                                collapse-tags
                                clearable></e-cascader>
                        </div>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>选择任意一级选项</span>
                    </div>
                    <div>
                        <div class="block">
                            <span class="demonstration">单选选择任意一级选项</span>
                            <e-cascader
                                :options="options"
                                :props="{ checkStrictly: true }"
                                clearable></e-cascader>
                            </div>
                            <div class="block">
                            <span class="demonstration">多选选择任意一级选项</span>
                            <e-cascader
                                :options="options"
                                :props="{ multiple: true, checkStrictly: true }"
                                clearable></e-cascader>
                        </div>
                    </div>
                </e-card>
            </e-col>
            <e-col :span="24" class="box-card">
                <e-card shadow="always">
                    <div slot="header" class="clearfix">
                        <span>动态加载</span>
                    </div>
                    <div>
                        <e-cascader :props="props"></e-cascader>
                    </div>
                </e-card>
            </e-col>
        </e-row>
    </div>
</template>
<script>
  let id = 0;
export default {
    components: {},
    data() {
        return {
            props: { 
                multiple: true,
                lazy: true,
                lazyLoad (node, resolve) {
                    const { level } = node;
                    setTimeout(() => {
                    const nodes = Array.from({ length: level + 1 })
                        .map(item => ({
                        value: ++id,
                        label: `选项${id}`,
                        leaf: level >= 2
                        }));
                    // 通过调用resolve将子节点数据返回，通知组件数据加载完成
                    resolve(nodes);
                    }, 1000);
                }
            },
            options2: [{
            value: 1,
            label: '东南',
            children: [{
            value: 2,
            label: '上海',
            children: [
              { value: 3, label: '普陀' },
              { value: 4, label: '黄埔' },
              { value: 5, label: '徐汇' }
            ]
          }, {
            value: 7,
            label: '江苏',
            children: [
              { value: 8, label: '南京' },
              { value: 9, label: '苏州' },
              { value: 10, label: '无锡' }
            ]
          }, {
            value: 12,
            label: '浙江',
            children: [
              { value: 13, label: '杭州' },
              { value: 14, label: '宁波' },
              { value: 15, label: '嘉兴' }
            ]
          }]
        }, {
          value: 17,
          label: '西北',
          children: [{
            value: 18,
            label: '陕西',
            children: [
              { value: 19, label: '西安' },
              { value: 20, label: '延安' }
            ]
          }, {
            value: 21,
            label: '新疆维吾尔族自治区',
            children: [
              { value: 22, label: '乌鲁木齐' },
              { value: 23, label: '克拉玛依' }
            ]
          }]
        }],
      value: [],
        options: [{
          value: 'zhinan',
          label: '指南',
          children: [{
            value: 'shejiyuanze',
            label: '设计原则',
            children: [{
              value: 'yizhi',
              label: '一致'
            }, {
              value: 'fankui',
              label: '反馈'
            }, {
              value: 'xiaolv',
              label: '效率'
            }, {
              value: 'kekong',
              label: '可控'
            }]
          }, {
            value: 'daohang',
            label: '导航',
            children: [{
              value: 'cexiangdaohang',
              label: '侧向导航'
            }, {
              value: 'dingbudaohang',
              label: '顶部导航'
            }]
          }]
        }, {
          value: 'zujian',
          label: '组件',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout 布局'
            }, {
              value: 'color',
              label: 'Color 色彩'
            }, {
              value: 'typography',
              label: 'Typography 字体'
            }, {
              value: 'icon',
              label: 'Icon 图标'
            }, {
              value: 'button',
              label: 'Button 按钮'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio 单选框'
            }, {
              value: 'checkbox',
              label: 'Checkbox 多选框'
            }, {
              value: 'input',
              label: 'Input 输入框'
            }, {
              value: 'input-number',
              label: 'InputNumber 计数器'
            }, {
              value: 'select',
              label: 'Select 选择器'
            }, {
              value: 'cascader',
              label: 'Cascader 级联选择器'
            }, {
              value: 'switch',
              label: 'Switch 开关'
            }, {
              value: 'slider',
              label: 'Slider 滑块'
            }, {
              value: 'time-picker',
              label: 'TimePicker 时间选择器'
            }, {
              value: 'date-picker',
              label: 'DatePicker 日期选择器'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker 日期时间选择器'
            }, {
              value: 'upload',
              label: 'Upload 上传'
            }, {
              value: 'rate',
              label: 'Rate 评分'
            }, {
              value: 'form',
              label: 'Form 表单'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table 表格'
            }, {
              value: 'tag',
              label: 'Tag 标签'
            }, {
              value: 'progress',
              label: 'Progress 进度条'
            }, {
              value: 'tree',
              label: 'Tree 树形控件'
            }, {
              value: 'pagination',
              label: 'Pagination 分页'
            }, {
              value: 'badge',
              label: 'Badge 标记'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert 警告'
            }, {
              value: 'loading',
              label: 'Loading 加载'
            }, {
              value: 'message',
              label: 'Message 消息提示'
            }, {
              value: 'message-box',
              label: 'MessageBox 弹框'
            }, {
              value: 'notification',
              label: 'Notification 通知'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu 导航菜单'
            }, {
              value: 'tabs',
              label: 'Tabs 标签页'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb 面包屑'
            }, {
              value: 'dropdown',
              label: 'Dropdown 下拉菜单'
            }, {
              value: 'steps',
              label: 'Steps 步骤条'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog 对话框'
            }, {
              value: 'tooltip',
              label: 'Tooltip 文字提示'
            }, {
              value: 'popover',
              label: 'Popover 弹出框'
            }, {
              value: 'card',
              label: 'Card 卡片'
            }, {
              value: 'carousel',
              label: 'Carousel 走马灯'
            }, {
              value: 'collapse',
              label: 'Collapse 折叠面板'
            }]
          }]
        }, {
          value: 'ziyuan',
          label: '资源',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'jiaohu',
            label: '组件交互文档'
          }]
        }]
        }
    },
    mounted() {
    },
    methods: {
        handleChange(value) {
        console.log(value);
      },
      getCheckedNodes(value){
        console.info("测试数据：：：：",this.$refs[value].getCheckedNodes())
      }
    }
}
</script>
  
<style>
.marginLeft {
    margin-left: 10px
}
.content {
    height: 100%;
    padding: 30px;
    background:#fff;
}

.block {
    display: inline-block;
    margin-left: 10px;
}

.box-card .el-col{
    margin-bottom:10px;
}
  </style>
