71 lines
1.7 KiB
Vue
71 lines
1.7 KiB
Vue
<template>
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<div class="scrollingloading" ref="targetElement">
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</div>
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</template>
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<script>
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export default {
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data() {
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return {
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isIntersecting: false,
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targetElement: null,
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observer: null
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}
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},
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props: {
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onState: {
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type: Boolean,
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default: false
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},
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},
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methods: {
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initObserver() {
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this.targetElement = this.$refs.targetElement
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this.observer = new IntersectionObserver(this.handleIntersection, {
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threshold: 1 // 当元素尺寸进入视口时触发，0-1代表0%-100%
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});
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if (this.targetElement) {
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this.observer.observe(this.targetElement);
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}
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},
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stopObserver() {
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if (this.targetElement && this.observer) {
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this.observer.unobserve(this.targetElement);
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}
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},
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handleIntersection(entries, observer) {
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entries.forEach(entry => {
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if (entry.isIntersecting) {
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this.isIntersecting = true;
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console.log(this.onState);
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if (this.onState) {
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this.$emit('onChange')
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}
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console.log('元素出现在了视图中，开始触发事件');
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} else {
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this.isIntersecting = false;
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console.log('元素在视图中不可见');
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}
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});
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}
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},
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mounted() {
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this.initObserver();
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console.log('初始化');
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},
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beforeDestroy() {
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this.stopObserver();
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},
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}
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</script>
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<style lang="less">
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.scrollingloading {
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width: 100%;
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height: 10px;
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}
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</style> |