vant

utils/dist/tree-select/index.js

@@ -0,0 +1,74 @@
+import { VantComponent } from '../common/component';
+import { addUnit } from '../common/utils';
+VantComponent({
+    classes: [
+        'main-item-class',
+        'content-item-class',
+        'main-active-class',
+        'content-active-class',
+        'main-disabled-class',
+        'content-disabled-class'
+    ],
+    props: {
+        items: {
+            type: Array,
+            observer: 'updateSubItems'
+        },
+        activeId: null,
+        mainActiveIndex: {
+            type: Number,
+            value: 0,
+            observer: 'updateSubItems'
+        },
+        height: {
+            type: [Number, String],
+            value: 300,
+            observer: 'updateHeight'
+        },
+        max: {
+            type: Number,
+            value: Infinity
+        }
+    },
+    data: {
+        subItems: []
+    },
+    created() {
+        this.updateHeight();
+    },
+    methods: {
+        // 当一个子项被选择时
+        onSelectItem(event) {
+            const { item } = event.currentTarget.dataset;
+            const isArray = Array.isArray(this.data.activeId);
+            // 判断有没有超出右侧选择的最大数
+            const isOverMax = isArray && this.data.activeId.length >= this.data.max;
+            // 判断该项有没有被选中, 如果有被选中，则忽视是否超出的条件
+            const isSelected = isArray
+                ? this.data.activeId.indexOf(item.id) > -1
+                : this.data.activeId === item.id;
+            if (!item.disabled && (!isOverMax || isSelected)) {
+                this.$emit('click-item', item);
+            }
+        },
+        // 当一个导航被点击时
+        onClickNav(event) {
+            const index = event.detail;
+            const item = this.data.items[index];
+            if (!item.disabled) {
+                this.$emit('click-nav', { index });
+            }
+        },
+        // 更新子项列表
+        updateSubItems() {
+            const { items, mainActiveIndex } = this.data;
+            const { children = [] } = items[mainActiveIndex] || {};
+            return this.set({ subItems: children });
+        },
+        updateHeight() {
+            this.setData({
+                innerHeight: addUnit(this.data.height)
+            });
+        }
+    }
+});