wszhyWx/libs/mixin/mixin.js

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