{
  "schemaVersion": 1,
  "sourceKind": "authored-spec",
  "provenance": "authored-in-repo",
  "specFile": "spec/移动端规格.md",
  "specSection": "33 · 单选框 Radio",
  "confidence": "high",
  "slug": "mobile-radio",
  "name": "单选框 Radio",
  "semanticTypeCandidates": [
    "radio",
    "radio-group",
    "single-choice"
  ],
  "variantDimensions": [
    {
      "name": "orientation",
      "values": [
        "vertical",
        "horizontal"
      ]
    },
    {
      "name": "button",
      "values": [
        "false",
        "true"
      ]
    }
  ],
  "representativeVariants": [
    {
      "orientation": "vertical",
      "button": "false",
      "label": "默认（圆点 + 文字，纵向排列并画分隔线）"
    },
    {
      "orientation": "horizontal",
      "button": "false",
      "label": "横向排列（值少、文案短时用）"
    },
    {
      "orientation": "vertical",
      "button": "true",
      "label": "胶囊标签式（无圆点，筛选条用）"
    }
  ],
  "anatomy": {
    "group": "根元素，role=\"radiogroup\" + aria-label 说明这组在选什么",
    "item": "单个选项，整行都是热区（原生 button + role=\"radio\"）",
    "icon": "圆点，未选中是空心环、选中是实心圆 + 内圈反色点",
    "label": "选项文字，占满剩余宽度",
    "desc": "可选说明行，跟在文字下方（如「需先完成企业认证」）",
    "state": "选中态 is-checked 与 aria-checked 双写"
  },
  "structurePatterns": {
    "orientation": "vertical（纵向排列，组内画分隔线）/ horizontal（横向排列，靠间距分组）",
    "button": "false（圆点 + 文字）/ true（胶囊标签式，无圆点）"
  },
  "usageHints": [
    "在一组互斥选项里选且只选一项（支付方式、配送时效、发票类型）",
    "触屏没有鼠标悬停可以预告状态，选中必须同时有形状差异（圆点内圈实心）与 aria-checked，不能只靠颜色",
    "整行（圆点 + 文字）都是热区，行高不小于 44px",
    "一次触摸即选中，不需要二次确认；选中后不能再点回空值",
    "互斥由组件负责：选中一项会立即清掉同组其它项的选中态，不留下两个选中"
  ],
  "doNotInvent": [
    "「取消选中」的回到空值交互（单选的语义就是必有一项）",
    "横向组自动换行的列数策略（由宿主按文案长度决定，组件只负责 flex-wrap）",
    "与表单一起提交时的隐藏字段（由宿主添加）",
    "选项内容的异步加载与搜索过滤"
  ],
  "unknowns": [
    "横向组超过一行时是否改成纵向（当前包裹后当行处理）",
    "圆点尺寸是否随字号一起放大（当前固定 20px）",
    "desc 说明行是否允许两行以上（当前单行省略）"
  ],
  "interaction": [
    "整行（圆点 + 文字）都是热区，行高不小于 44px；横向组里每项自身也保持这个边长",
    "一次触摸即选中，不需要二次确认；选中后**不能**再点回空值（需要清空由宿主提供额外的「清除」动作）",
    "互斥由组件负责：选中一项会立即清掉同组其它项的选中态，不留下两个选中",
    "切换动效是圆点内圈 150ms 缩放；减少动态偏好下瞬时切换",
    "选中后立即触发 change 事件，回传该项的值"
  ],
  "accessibility": [
    "组用 role=\"radiogroup\" + aria-label 说明分组名称",
    "每项是原生 button + role=\"radio\" + aria-checked（读屏会播报「单选按钮，已选中/未选中」）",
    "圆点与内圈是纯装饰，对读屏隐藏（aria-hidden），语义全靠 role=\"radio\"",
    "禁用项用原生 disabled 并补 aria-disabled=\"true\""
  ],
  "api": {
    "source": "implementation",
    "note": "props / events / slots 为 6 端实现的公共接口（说明文字取自规格对应小节）。字段名与各端源码逐名核对：node tools/verify-mobile-docs.mjs",
    "requiredNote": "「必传」按严格定义：实现里**没有默认值**时才为 Y（本门禁逐条核对 props 与各端源码的默认值，防止契约与实现脱节）。",
    "props": [
      {
        "name": "options",
        "type": "Array",
        "default": "[]",
        "desc": "选项数组，每项 { value, label, desc, disabled }（规格 §33.2）",
        "required": false
      },
      {
        "name": "value",
        "type": "string",
        "default": "''",
        "desc": "受控选中值，与 aria-checked 同步写（规格 §33.5）",
        "required": false
      },
      {
        "name": "orientation",
        "type": "'vertical' | 'horizontal'",
        "default": "'vertical'",
        "desc": "变体 orientation：纵向（画分隔线）还是横向排列（规格 §33.3）",
        "required": false
      },
      {
        "name": "button",
        "type": "boolean",
        "default": "false",
        "desc": "变体 button：胶囊标签式（无圆点），用于筛选条（规格 §33.3）",
        "required": false
      },
      {
        "name": "disabled",
        "type": "boolean",
        "default": "false",
        "desc": "状态 disabled：整组置灰且不可聚焦（规格 §33.4）",
        "required": false
      },
      {
        "name": "label",
        "type": "string",
        "default": "'单选项'",
        "desc": "分组名称，落到 radiogroup 的 aria-label（规格 §33.6）",
        "required": false
      }
    ],
    "events": [
      {
        "name": "change",
        "params": "(value)",
        "desc": "选中某项时触发，回传该项的值（规格 §33.5）"
      }
    ],
    "slots": [
      {
        "name": "default",
        "desc": "额外选项内容（宿主自己渲染的项，追在 options 之后，规格 §33.2 item）"
      }
    ]
  },
  "variantClasses": {
    "orientation": {
      "vertical": [],
      "horizontal": [
        ".kole-m-radio-group--horizontal"
      ]
    },
    "button": {
      "false": [],
      "true": [
        ".kole-m-radio--button"
      ]
    }
  },
  "demos": [
    {
      "id": "basic",
      "group": "01 组件类型",
      "title": "单选组",
      "desc": "互斥：选中一项会自动清掉同组其它项；整行热区不小于 44px。",
      "variant": "orientation=vertical"
    },
    {
      "id": "horizontal",
      "group": "01 组件类型",
      "title": "横向排列",
      "desc": "orientation=horizontal：值少、文案短时用，不再画分隔线。",
      "variant": "orientation=horizontal"
    },
    {
      "id": "button",
      "group": "01 组件类型",
      "title": "胶囊按钮式",
      "desc": "button=true：无圆点，选中态用品牌色边框 + 浅底。",
      "variant": "button=true"
    },
    {
      "id": "checked",
      "group": "02 组件状态",
      "title": "选中与未选中",
      "desc": "两者不能只靠颜色区分：内圈实心点 + aria-checked 双通道。",
      "variant": "状态 checked"
    },
    {
      "id": "disabled",
      "group": "02 组件状态",
      "title": "禁用项",
      "desc": "置灰且不响应：原生 disabled 让读屏播报不可用、键盘跳过。",
      "variant": "disabled=true"
    }
  ],
  "related": [
    {
      "slug": "mobile-checkbox",
      "why": "选项之间可以同时成立（多选、含全选）时用 Checkbox；只有一项能成立时才用 Radio"
    },
    {
      "slug": "mobile-switch",
      "why": "「开 / 关」这类即时生效的二值状态用 Switch（即时切换）；需要随表单一起提交的互斥选择用 Radio"
    },
    {
      "slug": "mobile-form",
      "why": "单选组作为表单里的一个字段时，标签、必填星号与错误提示由 Form 的 item 提供"
    }
  ]
}