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virtual-scroll-6.vue
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virtual-scroll-6.vue
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<template>
<q-layout view="lHh LpR fFf">
<q-page-container>
<q-page padding class="bg-white q-pr-xl">
<q-virtual-scroll
ref="virtualListRef"
type="table"
style="max-height: 70vh"
:virtual-scroll-item-size="48"
:virtual-scroll-sticky-size-start="48"
:virtual-scroll-sticky-size-end="32"
:items="heavyList"
@virtual-scroll="onVirtualScroll"
>
<template v-slot:before>
<thead class="thead-sticky">
<tr>
<th v-for="column in columns" :key="column">
{{ column }} - thead 1
</th>
</tr>
<tr>
<th v-for="column in columns" :key="column">
{{ column }} - thead 2 - sticky
</th>
</tr>
</thead>
</template>
<template v-slot:after>
<tfoot class="tfoot-sticky">
<tr>
<th v-for="column in columns" :key="column">
{{ column }} - tfoot 1 - sticky
</th>
</tr>
<tr>
<th v-for="column in columns" :key="column">
{{ column }} - tfoot 2
</th>
</tr>
</tfoot>
</template>
<template v-slot="{ item: row, index: rowNr }">
<tr :key="rowNr" :class="rowNr === listIndex ? 'text-primary' : ''">
<td v-for="column in columns" :key="column">
<template v-if="column !== 'col2'">
<div>{{ row[column] }}</div>
<div v-if="rowNr % 3 === 0">
{{ row[column] }} again
</div>
<div v-if="rowNr % 5 === 0">
{{ row[column] }} again again
</div>
</template>
<q-img v-else :src="row[column].src" :style="setSize ? { height: (2 * row[column].height) + 'px', width: (2 * row[column].width) + 'px' } : void 0" />
</td>
</tr>
</template>
</q-virtual-scroll>
<div class="row q-pa-md">
<div class="col">
<q-input
type="number"
:value="listIndex"
:min="0"
:max="listSize"
:debounce="3000"
label="Scroll to index"
input-class="text-right"
@input="onIndexChange"
/>
</div>
<q-toggle v-model="setSize" label="Preset size" />
</div>
</q-page>
</q-page-container>
</q-layout>
</template>
<style lang="sass">
.thead-sticky tr > *,
.tfoot-sticky tr > *
position: sticky
opacity: 1
z-index: 1
background-color: black
color: white
.thead-sticky tr:last-child > *
top: 0
.tfoot-sticky tr:first-child > *
bottom: 0
</style>
<script>
const
heavyList = [],
columns = [],
listSize = 10000,
lorem = 'Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sumLorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum Lorem ipsum lorem ipsum lorem ipsum lorem ip sum'
const getRandomInt = (min, max) => {
var x = Math.floor(Math.random() * (max - min + 1)) + min
return Math.ceil(x / 10) * 10
}
for (let i = 0; i < 30; i++) {
columns.push('col' + (i + 1))
}
for (let i = 0; i <= listSize; i++) {
const row = {}
for (let j = 0; j < columns.length; j++) {
row[columns[j]] = '#' + i + ' row ' + (i + 1) + ' / col ' + (j + 1)
if (j === 2) {
row[columns[j]] += ' - ' + lorem
}
else if (j === 1) {
const
width = getRandomInt(100, 150),
height = getRandomInt(150, 350)
row[columns[j]] = {
src: 'https://www.fillmurray.com/' + width + '/' + height + '?ver=' + j,
width,
height
}
}
}
heavyList.push(row)
}
Object.freeze(heavyList)
export default {
data () {
return {
heavyList,
columns,
listSize,
listIndex: 8200,
setSize: false
}
},
methods: {
onIndexChange (index) {
this.$refs.virtualListRef.scrollTo(index)
},
onVirtualScroll ({ index }) {
this.listIndex = index
}
},
mounted () {
this.$refs.virtualListRef.scrollTo(this.listIndex)
}
}
</script>