init

node_modules/@vant/weapp/dist/picker/index.js

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+import { VantComponent } from '../common/component';
+import { pickerProps } from './shared';
+VantComponent({
+    classes: ['active-class', 'toolbar-class', 'column-class'],
+    props: Object.assign(Object.assign({}, pickerProps), { valueKey: {
+            type: String,
+            value: 'text',
+        }, toolbarPosition: {
+            type: String,
+            value: 'top',
+        }, defaultIndex: {
+            type: Number,
+            value: 0,
+        }, columns: {
+            type: Array,
+            value: [],
+            observer(columns = []) {
+                this.simple = columns.length && !columns[0].values;
+                if (Array.isArray(this.children) && this.children.length) {
+                    this.setColumns().catch(() => { });
+                }
+            },
+        } }),
+    beforeCreate() {
+        Object.defineProperty(this, 'children', {
+            get: () => this.selectAllComponents('.van-picker__column') || [],
+        });
+    },
+    methods: {
+        noop() { },
+        setColumns() {
+            const { data } = this;
+            const columns = this.simple ? [{ values: data.columns }] : data.columns;
+            const stack = columns.map((column, index) => this.setColumnValues(index, column.values));
+            return Promise.all(stack);
+        },
+        emit(event) {
+            const { type } = event.currentTarget.dataset;
+            if (this.simple) {
+                this.$emit(type, {
+                    value: this.getColumnValue(0),
+                    index: this.getColumnIndex(0),
+                });
+            }
+            else {
+                this.$emit(type, {
+                    value: this.getValues(),
+                    index: this.getIndexes(),
+                });
+            }
+        },
+        onChange(event) {
+            if (this.simple) {
+                this.$emit('change', {
+                    picker: this,
+                    value: this.getColumnValue(0),
+                    index: this.getColumnIndex(0),
+                });
+            }
+            else {
+                this.$emit('change', {
+                    picker: this,
+                    value: this.getValues(),
+                    index: event.currentTarget.dataset.index,
+                });
+            }
+        },
+        // get column instance by index
+        getColumn(index) {
+            return this.children[index];
+        },
+        // get column value by index
+        getColumnValue(index) {
+            const column = this.getColumn(index);
+            return column && column.getValue();
+        },
+        // set column value by index
+        setColumnValue(index, value) {
+            const column = this.getColumn(index);
+            if (column == null) {
+                return Promise.reject(new Error('setColumnValue: 对应列不存在'));
+            }
+            return column.setValue(value);
+        },
+        // get column option index by column index
+        getColumnIndex(columnIndex) {
+            return (this.getColumn(columnIndex) || {}).data.currentIndex;
+        },
+        // set column option index by column index
+        setColumnIndex(columnIndex, optionIndex) {
+            const column = this.getColumn(columnIndex);
+            if (column == null) {
+                return Promise.reject(new Error('setColumnIndex: 对应列不存在'));
+            }
+            return column.setIndex(optionIndex);
+        },
+        // get options of column by index
+        getColumnValues(index) {
+            return (this.children[index] || {}).data.options;
+        },
+        // set options of column by index
+        setColumnValues(index, options, needReset = true) {
+            const column = this.children[index];
+            if (column == null) {
+                return Promise.reject(new Error('setColumnValues: 对应列不存在'));
+            }
+            const isSame = JSON.stringify(column.data.options) === JSON.stringify(options);
+            if (isSame) {
+                return Promise.resolve();
+            }
+            return column.set({ options }).then(() => {
+                if (needReset) {
+                    column.setIndex(0);
+                }
+            });
+        },
+        // get values of all columns
+        getValues() {
+            return this.children.map((child) => child.getValue());
+        },
+        // set values of all columns
+        setValues(values) {
+            const stack = values.map((value, index) => this.setColumnValue(index, value));
+            return Promise.all(stack);
+        },
+        // get indexes of all columns
+        getIndexes() {
+            return this.children.map((child) => child.data.currentIndex);
+        },
+        // set indexes of all columns
+        setIndexes(indexes) {
+            const stack = indexes.map((optionIndex, columnIndex) => this.setColumnIndex(columnIndex, optionIndex));
+            return Promise.all(stack);
+        },
+    },
+});