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