138 lines
3.4 KiB
Vue
138 lines
3.4 KiB
Vue
<template>
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<transition name="p-scrolltop" appear @enter="onEnter">
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<button :class="containerClass" v-if="visible" @click="onClick" type="button">
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<span :class="iconClass"></span>
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</button>
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</transition>
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</template>
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<script>
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import DomHandler from '../utils/DomHandler';
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export default {
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scrollListener: null,
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data() {
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return {
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visible: false
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}
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},
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props: {
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target: {
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type: String,
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default: 'window'
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},
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threshold: {
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type: Number,
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default: 400
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},
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icon: {
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type: String,
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default: 'pi pi-chevron-up'
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},
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behavior: {
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type: String,
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default: 'smooth'
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}
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},
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mounted() {
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if (this.target === 'window')
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this.bindDocumentScrollListener();
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else if (this.target === 'parent')
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this.bindParentScrollListener();
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},
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beforeUnmount() {
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if (this.target === 'window')
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this.unbindDocumentScrollListener();
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else if (this.target === 'parent')
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this.unbindParentScrollListener();
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},
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methods: {
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onClick() {
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let scrollElement = this.target === 'window' ? window : this.$el.parentElement;
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scrollElement.scroll({
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top: 0,
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behavior: this.behavior
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});
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},
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checkVisibility(scrollY) {
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if (scrollY > this.threshold)
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this.visible = true;
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else
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this.visible = false;
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},
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bindParentScrollListener() {
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this.scrollListener = () => {
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this.checkVisibility(this.$el.parentElement.scrollTop);
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};
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this.$el.parentElement.addEventListener('scroll', this.scrollListener);
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},
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bindDocumentScrollListener() {
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this.scrollListener = () => {
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this.checkVisibility(DomHandler.getWindowScrollTop());
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};
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window.addEventListener('scroll', this.scrollListener);
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},
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unbindParentScrollListener() {
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if (this.scrollListener) {
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this.$el.parentElement.removeEventListener('scroll', this.scrollListener);
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this.scrollListener = null;
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}
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},
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unbindDocumentScrollListener() {
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if (this.scrollListener) {
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window.removeEventListener('scroll', this.scrollListener);
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this.scrollListener = null;
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}
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},
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onEnter() {
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this.$el.style.zIndex = String(DomHandler.generateZIndex());
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}
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},
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computed: {
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containerClass() {
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return ['p-scrolltop p-link p-component', {'p-scrolltop-sticky': this.target !== 'window'}];
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},
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iconClass() {
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return ['p-scrolltop-icon', this.icon];
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}
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}
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}
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</script>
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<style>
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.p-scrolltop {
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position: fixed;
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bottom: 20px;
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right: 20px;
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display: flex;
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align-items: center;
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justify-content: center;
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}
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.p-scrolltop-sticky {
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position: sticky;
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}
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.p-scrolltop-sticky.p-link {
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margin-left: auto;
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}
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.p-scrolltop-enter-from {
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opacity: 0;
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}
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.p-scrolltop-enter-active {
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transition: opacity .15s;
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}
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.p-scrolltop.p-scrolltop-leave-to {
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opacity: 0;
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}
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.p-scrolltop-leave-active {
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transition: opacity .15s;
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}
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</style>
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