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65 lines
2.2 KiB
65 lines
2.2 KiB
3 years ago
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module.exports = {
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data() {
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return {}
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},
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onLoad() {
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// getRect挂载到$u上，因为这方法需要使用in(this)，所以无法把它独立成一个单独的文件导出
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this.$u.getRect = this.$uGetRect
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},
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methods: {
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// 查询节点信息
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// 目前此方法在支付宝小程序中无法获取组件跟接点的尺寸，为支付宝的bug(2020-07-21)
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// 解决办法为在组件根部再套一个没有任何作用的view元素
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$uGetRect(selector, all) {
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return new Promise(resolve => {
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uni.createSelectorQuery().
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in(this)[all ? 'selectAll' : 'select'](selector)
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.boundingClientRect(rect => {
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if (all && Array.isArray(rect) && rect.length) {
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resolve(rect)
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}
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if (!all && rect) {
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resolve(rect)
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}
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})
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.exec()
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})
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},
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getParentData(parentName = '') {
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// 避免在created中去定义parent变量
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if(!this.parent) this.parent = false;
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// 这里的本质原理是，通过获取父组件实例(也即u-radio-group的this)
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// 将父组件this中对应的参数，赋值给本组件(u-radio的this)的parentData对象中对应的属性
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// 之所以需要这么做，是因为所有端中，头条小程序不支持通过this.parent.xxx去监听父组件参数的变化
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this.parent = this.$u.$parent.call(this, parentName);
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if(this.parent) {
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// 历遍parentData中的属性，将parent中的同名属性赋值给parentData
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Object.keys(this.parentData).map(key => {
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this.parentData[key] = this.parent[key];
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});
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}
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},
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// 阻止事件冒泡
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preventEvent(e) {
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e && e.stopPropagation && e.stopPropagation()
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}
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},
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onReachBottom() {
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uni.$emit('uOnReachBottom')
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},
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beforeDestroy() {
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// 判断当前页面是否存在parent和chldren，一般在checkbox和checkbox-group父子联动的场景会有此情况
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// 组件销毁时，移除子组件在父组件children数组中的实例，释放资源，避免数据混乱
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if(this.parent && uni.$u.test.array(this.parent.children)) {
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// 组件销毁时，移除父组件中的children数组中对应的实例
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const childrenList = this.parent.children
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childrenList.map((child, index) => {
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// 如果相等，则移除
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if(child === this) {
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childrenList.splice(index, 1)
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}
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})
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}
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}
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}
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