vant

utils/dist/sidebar/index.js

@@ -0,0 +1,43 @@
+import { VantComponent } from '../common/component';
+VantComponent({
+    relation: {
+        name: 'sidebar-item',
+        type: 'descendant',
+        linked(target) {
+            this.children.push(target);
+            this.setActive(this.data.activeKey);
+        },
+        unlinked(target) {
+            this.children = this.children.filter((item) => item !== target);
+            this.setActive(this.data.activeKey);
+        }
+    },
+    props: {
+        activeKey: {
+            type: Number,
+            value: 0,
+            observer: 'setActive'
+        }
+    },
+    beforeCreate() {
+        this.children = [];
+        this.currentActive = -1;
+    },
+    methods: {
+        setActive(activeKey) {
+            const { children, currentActive } = this;
+            if (!children.length) {
+                return Promise.resolve();
+            }
+            this.currentActive = activeKey;
+            const stack = [];
+            if (currentActive !== activeKey && children[currentActive]) {
+                stack.push(children[currentActive].setActive(false));
+            }
+            if (children[activeKey]) {
+                stack.push(children[activeKey].setActive(true));
+            }
+            return Promise.all(stack);
+        }
+    }
+});