2022-09-09 20:41:18 +00:00
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<template>
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<div>
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2022-12-19 11:57:07 +00:00
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<Head>
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<Title>Vue Select Component</Title>
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<Meta name="description" content="Dropdown also known as Select, is used to choose an item from a collection of options." />
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</Head>
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2022-09-09 20:41:18 +00:00
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<div class="content-section introduction">
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<div class="feature-intro">
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<h1>Dropdown</h1>
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<p>Dropdown is used to select an item from a list of options.</p>
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</div>
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<AppDemoActions />
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</div>
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<div class="content-section implementation">
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<div class="card">
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<h5>Basic</h5>
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<Dropdown v-model="selectedCity1" :options="cities" optionLabel="name" optionValue="code" placeholder="Select a City" />
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<h5>Editable</h5>
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<Dropdown v-model="selectedCity2" :options="cities" optionLabel="name" :editable="true" />
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<h5>Grouped</h5>
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<Dropdown v-model="selectedGroupedCity" :options="groupedCities" optionLabel="label" optionGroupLabel="label" optionGroupChildren="items">
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<template #optiongroup="slotProps">
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<div class="flex align-items-center country-item">
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<img src="../../assets/images/flag_placeholder.png" :class="'flag flag-' + slotProps.option.code.toLowerCase()" width="18" />
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<div>{{ slotProps.option.label }}</div>
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</div>
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</template>
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</Dropdown>
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<h5>Advanced with Templating, Filtering and Clear Icon</h5>
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<Dropdown v-model="selectedCountry" :options="countries" optionLabel="name" :filter="true" placeholder="Select a Country" :showClear="true">
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<template #value="slotProps">
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2022-12-08 12:26:57 +00:00
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<div v-if="slotProps.value" class="country-item country-item-value">
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2022-09-09 20:41:18 +00:00
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<img src="../../assets/images/flag_placeholder.png" :class="'flag flag-' + slotProps.value.code.toLowerCase()" />
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<div>{{ slotProps.value.name }}</div>
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</div>
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<span v-else>
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{{ slotProps.placeholder }}
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</span>
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</template>
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<template #option="slotProps">
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<div class="country-item">
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<img src="../../assets/images/flag_placeholder.png" :class="'flag flag-' + slotProps.option.code.toLowerCase()" />
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<div>{{ slotProps.option.name }}</div>
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</div>
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</template>
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</Dropdown>
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<h5>Loading State</h5>
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<Dropdown placeholder="Loading..." loading></Dropdown>
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<h5>Virtual Scroll (100000 Items)</h5>
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<Dropdown v-model="selectedItem1" :options="items" optionLabel="label" optionValue="value" :virtualScrollerOptions="{ itemSize: 38 }" placeholder="Select Item"></Dropdown>
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<h5>Virtual Scroll (100000 Items) and Lazy</h5>
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<Dropdown
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v-model="selectedItem2"
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:options="lazyItems"
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optionLabel="label"
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optionValue="value"
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:virtualScrollerOptions="{ lazy: true, onLazyLoad: onLazyLoad, itemSize: 38, showLoader: true, loading: loading, delay: 250 }"
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placeholder="Select Item"
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>
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<template v-slot:loader="{ options }">
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<div class="flex align-items-center p-2" style="height: 38px">
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<Skeleton :width="options.even ? '60%' : '50%'" height="1rem" />
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</div>
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</template>
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</Dropdown>
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</div>
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</div>
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<DropdownDoc />
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</div>
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</template>
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<script>
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import DropdownDoc from './DropdownDoc';
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export default {
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data() {
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return {
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selectedCity1: null,
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selectedCity2: null,
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selectedCountry: null,
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selectedGroupedCity: null,
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selectedItem1: null,
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selectedItem2: null,
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loading: false,
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cities: [
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{ name: 'New York', code: 'NY' },
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{ name: 'Rome', code: 'RM' },
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{ name: 'London', code: 'LDN' },
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{ name: 'Istanbul', code: 'IST' },
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{ name: 'Paris', code: 'PRS' }
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],
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countries: [
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{ name: 'Australia', code: 'AU' },
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{ name: 'Brazil', code: 'BR' },
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{ name: 'China', code: 'CN' },
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{ name: 'Egypt', code: 'EG' },
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{ name: 'France', code: 'FR' },
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{ name: 'Germany', code: 'DE' },
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{ name: 'India', code: 'IN' },
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{ name: 'Japan', code: 'JP' },
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{ name: 'Spain', code: 'ES' },
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{ name: 'United States', code: 'US' }
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],
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groupedCities: [
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{
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label: 'Germany',
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code: 'DE',
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items: [
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{ label: 'Berlin', value: 'Berlin' },
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{ label: 'Frankfurt', value: 'Frankfurt' },
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{ label: 'Hamburg', value: 'Hamburg' },
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{ label: 'Munich', value: 'Munich' }
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]
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},
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{
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label: 'USA',
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code: 'US',
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items: [
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{ label: 'Chicago', value: 'Chicago' },
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{ label: 'Los Angeles', value: 'Los Angeles' },
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{ label: 'New York', value: 'New York' },
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{ label: 'San Francisco', value: 'San Francisco' }
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]
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},
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{
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label: 'Japan',
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code: 'JP',
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items: [
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{ label: 'Kyoto', value: 'Kyoto' },
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{ label: 'Osaka', value: 'Osaka' },
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{ label: 'Tokyo', value: 'Tokyo' },
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{ label: 'Yokohama', value: 'Yokohama' }
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]
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}
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],
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items: Array.from({ length: 100000 }, (_, i) => ({ label: `Item #${i}`, value: i })),
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lazyItems: Array.from({ length: 100000 })
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};
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},
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loadLazyTimeout: null,
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methods: {
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onLazyLoad(event) {
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this.loading = true;
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if (this.loadLazyTimeout) {
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clearTimeout(this.loadLazyTimeout);
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}
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//imitate delay of a backend call
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this.loadLazyTimeout = setTimeout(() => {
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const { first, last } = event;
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const lazyItems = [...this.lazyItems];
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for (let i = first; i < last; i++) {
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lazyItems[i] = { label: `Item #${i}`, value: i };
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}
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this.lazyItems = lazyItems;
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this.loading = false;
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}, Math.random() * 1000 + 250);
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}
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},
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components: {
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DropdownDoc: DropdownDoc
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}
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};
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</script>
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<style lang="scss" scoped>
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.p-dropdown {
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width: 14rem;
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}
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.country-item-value {
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img.flag {
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width: 17px;
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}
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}
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</style>
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