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<template>
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<div class="block-content">
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<transition
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@before-enter="onBeforeEnter"
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@enter="onEnter"
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@after-enter="onAfterEnter"
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@before-leave="onBeforeLeave"
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@leave="onLeave"
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mode="out-in"
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>
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<p v-if="!isExpanded" class="block-content__preview" >The EYFS British kindergarten curriculum has been adopted by multiple preschools throughout the country. The curriculum not only acknowledges theoretical subjects, yet</p>
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<p
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v-else
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:class="{
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'block-content__paragraph': true,
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'block-content__paragraph--is-expanded': isExpanded,
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}"
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>also provides practical knowledge of daily life to preschoolers.</p>
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</transition>
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<button
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type="button"
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class="block-content__button"
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aria-label="Toggle button"
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@click="isExpanded = !isExpanded"
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>
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{{ toggleCtaLabel }}
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</button>
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</div>
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</template>
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<script lang="ts">
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import { computed, defineComponent, ref, toRefs } from "vue";
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export default defineComponent({
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name: "ExpandableBlockContent",
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props: {
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content: { type: String },
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visibleLines: { type: Number, default: 4 },
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},
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setup(props) {
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const { visibleLines } = toRefs(props);
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// Collapsed state
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// Assuming that default line-height is 24px
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const LINE_HEIGHT = 24;
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const maxHeightCollapsed = computed(() => LINE_HEIGHT * visibleLines.value);
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// Animation hooks
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const onBeforeEnter = (el: Element) => {
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const htmlEl = el as HTMLElement;
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htmlEl.style.height = maxHeightCollapsed.value + "px";
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};
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const onEnter = (el: Element) => {
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const htmlEl = el as HTMLElement;
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htmlEl.style.height = el.scrollHeight + "px";
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};
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const onAfterEnter = (el: Element) => {
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const htmlEl = el as HTMLElement;
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htmlEl.style.overflow = "hidden";
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};
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const onBeforeLeave = (el: Element) => {
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const htmlEl = el as HTMLElement;
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htmlEl.style.height = `${el.scrollHeight}px`;
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htmlEl.style.overflow = "hidden";
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};
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const onLeave = (el: Element) => {
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const htmlEl = el as HTMLElement;
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htmlEl.style.height = maxHeightCollapsed.value + "px";
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htmlEl.style.overflow = "hidden";
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};
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// Expanded state
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const isExpanded = ref(false);
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const toggleCtaLabel = computed(() =>
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isExpanded.value ? "Read less" : "Read more"
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);
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return {
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isExpanded,
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toggleCtaLabel,
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onBeforeEnter,
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onEnter,
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onAfterEnter,
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onBeforeLeave,
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onLeave,
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};
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},
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});
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<div id="app" class="container">
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<p>A simple Read More, Read Less pen in Vue.js</p>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Venenatis lectus magna
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fringilla urna. Etiam tempor orci eu lobortis. Integer quis auctor elit sed vulputate mi sit. Lacinia
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at quis risus sed vulputate odio ut enim blandit. Nibh praesent tristique magna sit amet purus. Eleifend donec pretium vulputate sapien nec
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sagittis. Facilisi morbi tempus iaculis urna id volutpat. Ultrices neque ornare aenean euismod.<span v-if="readMore"></span>
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<span v-else>...</span>
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</p>
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<p v-show="readMore">Ligula ullamcorper malesuada proin libero nunc consequat interdum varius. Turpis egestas pretium aenean pharetra magna ac
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placerat. Sed egestas egestas fringilla phasellus faucibus scelerisque eleifend donec. Sed cras ornare arcu dui. Aliquam vestibulum
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morbi blandit cursus. Adipiscing elit ut aliquam purus sit amet. Aenean sed adipiscing diam donec adipiscing tristique risus nec. Ut etiam sit amet
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nisl purus in mollis. Eu mi bibendum neque egestas congue quisque egestas diam in. Pellentesque adipiscing
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commodo elit at imperdiet dui accumsan sit.
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</p>
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<button class="btn btn-success" @click="readMore =! readMore">
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<span v-if="readMore">Read Less</span>
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<span v-else>Read More</span>
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</button>
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</div>
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</template>
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<script>
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// new Vue({
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// el: '#app',
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// data:{
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// readMore: false
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// }
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// });
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</script>
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