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virtual-scroll-3.vue
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virtual-scroll-3.vue
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<template>
<q-layout view="lHh LpR fFf">
<q-page-container>
<q-page padding :style-fn="offset => ({ height: ($q.screen.height - offset) + 'px' })" class="column">
<div class="text-h6 q-my-lg">
Virtual list with dynamic generated items ({{ size.toLocaleString() }} items)
</div>
<q-virtual-scroll
class="col"
component="q-list"
:items-size="size"
:items-fn="getItems"
:virtual-scroll-item-size="57"
separator
ref="list"
>
<template v-slot="{ item, index }">
<q-item :key="index">
<q-item-section avatar>
<q-avatar :color="item.avatarColor" text-color="white">
{{ item.avatarLetter }}
</q-avatar>
</q-item-section>
<q-item-section>
<q-item-label>
{{ item.label }}
</q-item-label>
</q-item-section>
<q-item-section side top>
<q-item-label caption>
#{{ index }}
</q-item-label>
</q-item-section>
</q-item>
</template>
</q-virtual-scroll>
<div class="q-pa-md row justify-between">
<q-btn label="+1e5" @click="() => { size += 1e5 }" />
<q-btn label="+1e4" @click="() => { size += 1e4 }" />
<q-btn label="+1e3" @click="() => { size += 1e3 }" />
<q-btn label="-1e3" @click="() => { size -= size > 1e3 ? 1e3 : size }" />
<q-btn label="-1e4" @click="() => { size -= size > 1e4 ? 1e4 : size }" />
<q-btn label="-1e5" @click="() => { size -= size > 1e5 ? 1e5 : size }" />
<q-btn label="End" @click="() => { $refs.list.scrollTo(size) }" />
</div>
</q-page>
</q-page-container>
</q-layout>
</template>
<script>
export default {
data () {
return {
size: 100
}
},
methods: {
getItems (from, size) {
const items = []
for (let i = 0; i < size; i++) {
items.push({
avatarColor: 'red',
avatarLetter: 'A',
label: `Item ${from + i + 1}`
})
}
return Object.freeze(items)
}
},
mounted () {
this.intervalTimer = setInterval(() => {
this.size += 1
}, 3000)
},
beforeDestroy () {
clearInterval(this.intervalTimer)
}
}
</script>