98 lines
3.2 KiB
Vue
98 lines
3.2 KiB
Vue
<template>
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<transition name="p-scrolltop" appear @enter="onEnter" @after-leave="onAfterLeave" v-bind="ptm('transition')">
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<button v-if="visible" :ref="containerRef" :class="cx('root')" @click="onClick" type="button" :aria-label="scrollTopAriaLabel" v-bind="ptm('root')" data-pc-name="scrolltop">
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<slot name="icon" :class="cx('icon')">
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<component :is="icon ? 'span' : 'ChevronUpIcon'" :class="[cx('icon'), icon]" v-bind="ptm('icon')" />
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</slot>
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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 ChevronUpIcon from 'primevue/icons/chevronup';
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import { DomHandler, ZIndexUtils } from 'primevue/utils';
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import BaseScrollTop from './BaseScrollTop.vue';
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export default {
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name: 'ScrollTop',
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extends: BaseScrollTop,
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scrollListener: null,
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container: 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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mounted() {
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if (this.target === 'window') this.bindDocumentScrollListener();
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else if (this.target === 'parent') this.bindParentScrollListener();
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},
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beforeUnmount() {
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if (this.target === 'window') this.unbindDocumentScrollListener();
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else if (this.target === 'parent') this.unbindParentScrollListener();
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if (this.container) {
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ZIndexUtils.clear(this.container);
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this.overlay = null;
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}
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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.$el.parentElement;
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scrollElement.scroll({
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top: 0,
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behavior: this.behavior
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});
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},
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checkVisibility(scrollY) {
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if (scrollY > this.threshold) this.visible = true;
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else this.visible = false;
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},
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bindParentScrollListener() {
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this.scrollListener = () => {
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this.checkVisibility(this.$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(el) {
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ZIndexUtils.set('overlay', el, this.$primevue.config.zIndex.overlay);
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},
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onAfterLeave(el) {
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ZIndexUtils.clear(el);
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},
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containerRef(el) {
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this.container = el;
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}
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},
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computed: {
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scrollTopAriaLabel() {
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return this.$primevue.config.locale.aria ? this.$primevue.config.locale.aria.scrollTop : undefined;
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}
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},
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components: {
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ChevronUpIcon
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}
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};
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</script>
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