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node_modules/vant/es/tree-select/index.css

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+.van-tree-select{position:relative;display:-webkit-box;display:-webkit-flex;display:flex;font-size:14px;-webkit-user-select:none;user-select:none}.van-tree-select__nav{-webkit-box-flex:1;-webkit-flex:1;flex:1;overflow-y:auto;background-color:#f7f8fa;-webkit-overflow-scrolling:touch}.van-tree-select__nav-item{padding:14px 12px}.van-tree-select__content{-webkit-box-flex:2;-webkit-flex:2;flex:2;overflow-y:auto;background-color:#fff;-webkit-overflow-scrolling:touch}.van-tree-select__item{position:relative;padding:0 32px 0 16px;font-weight:500;line-height:48px;cursor:pointer}.van-tree-select__item--active{color:#ee0a24}.van-tree-select__item--disabled{color:#c8c9cc;cursor:not-allowed}.van-tree-select__selected{position:absolute;top:50%;right:16px;margin-top:-8px;font-size:16px}

node_modules/vant/es/tree-select/index.js

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+import _mergeJSXProps from "@vue/babel-helper-vue-jsx-merge-props";
+// Utils
+import { createNamespace, addUnit } from '../utils';
+import { emit, inherit } from '../utils/functional'; // Components
+
+import Icon from '../icon';
+import Sidebar from '../sidebar';
+import SidebarItem from '../sidebar-item'; // Types
+
+var _createNamespace = createNamespace('tree-select'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+function TreeSelect(h, props, slots, ctx) {
+  var items = props.items,
+      height = props.height,
+      activeId = props.activeId,
+      selectedIcon = props.selectedIcon,
+      mainActiveIndex = props.mainActiveIndex;
+
+  if (process.env.NODE_ENV === 'development') {
+    if (ctx.listeners.navclick) {
+      console.warn('[Vant] TreeSelect: "navclick" event is deprecated, use "click-nav" instead.');
+    }
+
+    if (ctx.listeners.itemclick) {
+      console.warn('[Vant] TreeSelect: "itemclick" event is deprecated, use "click-item" instead.');
+    }
+  }
+
+  var selectedItem = items[+mainActiveIndex] || {};
+  var subItems = selectedItem.children || [];
+  var isMultiple = Array.isArray(activeId);
+
+  function isActiveItem(id) {
+    return isMultiple ? activeId.indexOf(id) !== -1 : activeId === id;
+  }
+
+  var Navs = items.map(function (item) {
+    var _item$badge;
+
+    return h(SidebarItem, {
+      "attrs": {
+        "dot": item.dot,
+        "info": (_item$badge = item.badge) != null ? _item$badge : item.info,
+        "title": item.text,
+        "disabled": item.disabled
+      },
+      "class": [bem('nav-item'), item.className]
+    });
+  });
+
+  function Content() {
+    if (slots.content) {
+      return slots.content();
+    }
+
+    return subItems.map(function (item) {
+      return h("div", {
+        "key": item.id,
+        "class": ['van-ellipsis', bem('item', {
+          active: isActiveItem(item.id),
+          disabled: item.disabled
+        })],
+        "on": {
+          "click": function click() {
+            if (!item.disabled) {
+              var newActiveId = item.id;
+
+              if (isMultiple) {
+                newActiveId = activeId.slice();
+                var index = newActiveId.indexOf(item.id);
+
+                if (index !== -1) {
+                  newActiveId.splice(index, 1);
+                } else if (newActiveId.length < props.max) {
+                  newActiveId.push(item.id);
+                }
+              }
+
+              emit(ctx, 'update:active-id', newActiveId);
+              emit(ctx, 'click-item', item); // compatible with legacy usage, should be removed in next major version
+
+              emit(ctx, 'itemclick', item);
+            }
+          }
+        }
+      }, [item.text, isActiveItem(item.id) && h(Icon, {
+        "attrs": {
+          "name": selectedIcon
+        },
+        "class": bem('selected')
+      })]);
+    });
+  }
+
+  return h("div", _mergeJSXProps([{
+    "class": bem(),
+    "style": {
+      height: addUnit(height)
+    }
+  }, inherit(ctx)]), [h(Sidebar, {
+    "class": bem('nav'),
+    "attrs": {
+      "activeKey": mainActiveIndex
+    },
+    "on": {
+      "change": function change(index) {
+        emit(ctx, 'update:main-active-index', index);
+        emit(ctx, 'click-nav', index); // compatible with legacy usage, should be removed in next major version
+
+        emit(ctx, 'navclick', index);
+      }
+    }
+  }, [Navs]), h("div", {
+    "class": bem('content')
+  }, [Content()])]);
+}
+
+TreeSelect.props = {
+  max: {
+    type: [Number, String],
+    default: Infinity
+  },
+  items: {
+    type: Array,
+    default: function _default() {
+      return [];
+    }
+  },
+  height: {
+    type: [Number, String],
+    default: 300
+  },
+  activeId: {
+    type: [Number, String, Array],
+    default: 0
+  },
+  selectedIcon: {
+    type: String,
+    default: 'success'
+  },
+  mainActiveIndex: {
+    type: [Number, String],
+    default: 0
+  }
+};
+export default createComponent(TreeSelect);

node_modules/vant/es/tree-select/index.less

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+@import '../style/var';
+
+.van-tree-select {
+  position: relative;
+  display: flex;
+  font-size: @tree-select-font-size;
+  user-select: none;
+
+  &__nav {
+    flex: 1;
+    overflow-y: auto;
+    background-color: @tree-select-nav-background-color;
+    -webkit-overflow-scrolling: touch;
+
+    &-item {
+      padding: @tree-select-nav-item-padding;
+    }
+  }
+
+  &__content {
+    flex: 2;
+    overflow-y: auto;
+    background-color: @tree-select-content-background-color;
+    -webkit-overflow-scrolling: touch;
+  }
+
+  &__item {
+    position: relative;
+    padding: 0 32px 0 @padding-md;
+    font-weight: @font-weight-bold;
+    line-height: @tree-select-item-height;
+    cursor: pointer;
+
+    &--active {
+      color: @tree-select-item-active-color;
+    }
+
+    &--disabled {
+      color: @tree-select-item-disabled-color;
+      cursor: not-allowed;
+    }
+  }
+
+  &__selected {
+    position: absolute;
+    top: 50%;
+    right: @padding-md;
+    margin-top: -@padding-xs;
+    font-size: @tree-select-item-selected-size;
+  }
+}

node_modules/vant/es/tree-select/style/index.js

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+import '../../style/base.css';
+import '../../info/index.css';
+import '../../sidebar-item/index.css';
+import '../../icon/index.css';
+import '../../sidebar/index.css';
+import '../index.css';

node_modules/vant/es/tree-select/style/less.js

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+import '../../style/base.less';
+import '../../info/index.less';
+import '../../sidebar-item/index.less';
+import '../../icon/index.less';
+import '../../sidebar/index.less';
+import '../index.less';