<template>
<div class="content-section documentation">
<TabView>
<TabPanel header="Documentation">
<h3>Import</h3>
<CodeHighlight lang="javascript">
import Dropdown from 'primevue/dropdown';
</CodeHighlight>
<h3>Getting Started</h3>
<p>Dropdown requires a value to bind and a collection of arbitrary objects along with the <i>optionLabel</i> property to specify the field name of the option.</p>
<CodeHighlight>
<Dropdown v-model="selectedCity" :options="cities" optionLabel="name" placeholder="Select a City" />
</CodeHighlight>
<CodeHighlight lang="js">
data() {
return {
selectedCity: null,
cities: [
{name: 'New York', code: 'NY'},
{name: 'Rome', code: 'RM'},
{name: 'London', code: 'LDN'},
{name: 'Istanbul', code: 'IST'},
{name: 'Paris', code: 'PRS'}
]
}
}
</CodeHighlight>
<h3>Placeholder</h3>
<p>Common pattern is providing an empty option as the placeholder when using native selects, however Dropdown has built-in support using the placeholder option so it is suggested to use it instead of creating an empty option.</p>
<h3>Filtering</h3>
<p>Options can be filtered using an input field in the overlay by enabling the <i>filter</i> property.</p>
<CodeHighlight>
<Dropdown v-model="selectedCar" :options="cars" optionLabel="brand" placeholder="Select a Car" :filter="true" filterPlaceholder="Find Car"/>
</CodeHighlight>
<h3>Custom Content</h3>
<p>Label of an option is used as the display text of an item by default, for custom content support define an <i>item</i> template that gets the option instance as a parameter and returns the content.</p>
<CodeHighlight>
<template v-pre>
<Dropdown v-model="selectedCar" :options="cars" optionLabel="brand" placeholder="Select a Car" :filter="true" :showClear="true">
<template #option="slotProps">
<div class="p-clearfix p-dropdown-car-option">
<img :alt="slotProps.option.brand" :src="'/demo/images/car/' + slotProps.option.brand + '.png'" />
<span>{{slotProps.option.brand}}</span>
</div>
</template>
</Dropdown>
</template>
</CodeHighlight>
<h3>Properties</h3>
<div class="doc-tablewrapper">
<table class="doc-table">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>value</td>
<td>any</td>
<td>null</td>
<td>Value of the component.</td>
</tr>
<tr>
<td>options</td>
<td>array</td>
<td>null</td>
<td>An array of selectitems to display as the available options.</td>
</tr>
<tr>
<td>optionLabel</td>
<td>string</td>
<td>null</td>
<td>Property name to use as the label of an option.</td>
</tr>
<tr>
<td>optionValue</td>
<td>string</td>
<td>null</td>
<td>Property name to use as the value of an option, defaults to the option itself when not defined.</td>
</tr>
<tr>
<td>optionDisabled</td>
<td>boolean</td>
<td>null</td>
<td>Property name to use as the disabled flag of an option, defaults to false when not defined.</td>
</tr>
<tr>
<td>scrollHeight</td>
<td>string</td>
<td>200px</td>
<td>Height of the viewport in pixels, a scrollbar is defined if height of list exceeds this value.</td>
</tr>
<tr>
<td>filter</td>
<td>boolean</td>
<td>false</td>
<td>When specified, displays an input field to filter the items on keyup.</td>
</tr>
<tr>
<td>filterPlaceholder</td>
<td>string</td>
<td>null</td>
<td>Placeholder text to show when filter input is empty.</td>
</tr>
<tr>
<td>editable</td>
<td>boolean</td>
<td>false</td>
<td>When present, custom value instead of predefined options can be entered using the editable input field.</td>
</tr>
<tr>
<td>placeholder</td>
<td>string</td>
<td>null</td>
<td>Default text to display when no option is selected.</td>
</tr>
<tr>
<td>disabled</td>
<td>boolean</td>
<td>false</td>
<td>When present, it specifies that the component should be disabled.</td>
</tr>
<tr>
<td>dataKey</td>
<td>string</td>
<td>null</td>
<td>A property to uniquely match the value in options for better performance.</td>
</tr>
<tr>
<td>showClear</td>
<td>boolean</td>
<td>false</td>
<td>When enabled, a clear icon is displayed to clear the value.</td>
</tr>
<tr>
<td>tabindex</td>
<td>number</td>
<td>null</td>
<td>Index of the element in tabbing order.</td>
</tr>
</tbody>
</table>
</div>
<h3>Events</h3>
<div class="doc-tablewrapper">
<table class="doc-table">
<thead>
<tr>
<th>Name</th>
<th>Parameters</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>change</td>
<td>event.originalEvent: Original event <br />
event.value: Selected option value </td>
<td>Callback to invoke on value change.</td>
</tr>
<tr>
<td>input</td>
<td>value: New value</td>
<td>Callback to invoke on value change.</td>
</tr>
</tbody>
</table>
</div>
<h3>Styling</h3>
<p>Following is the list of structural style classes, for theming classes visit <router-link to="/theming">theming</router-link> page.</p>
<div class="doc-tablewrapper">
<table class="doc-table">
<thead>
<tr>
<th>Name</th>
<th>Element</th>
</tr>
</thead>
<tbody>
<tr>
<td>p-dropdown</td>
<td>Container element.</td>
</tr>
<tr>
<td>p-dropdown-label</td>
<td>Element to display label of selected option.</td>
</tr>
<tr>
<td>p-dropdown-trigger</td>
<td>Icon element.</td>
</tr>
<tr>
<td>p-dropdown-panel</td>
<td>Icon element.</td>
</tr>
<tr>
<td>p-dropdown-items-wrapper</td>
<td>Wrapper element of items list.</td>
</tr>
<tr>
<td>p-dropdown-items</td>
<td>List element of items.</td>
</tr>
<tr>
<td>p-dropdown-item</td>
<td>An item in the list.</td>
</tr>
<tr>
<td>p-dropdown-filter-container</td>
<td>Container of filter input.</td>
</tr>
<tr>
<td>p-dropdown-filter</td>
<td>Filter element.</td>
</tr>
<tr>
<td>p-dropdown-open</td>
<td>Container element when overlay is visible.</td>
</tr>
</tbody>
</table>
</div>
<h3>Dependencies</h3>
<p>None.</p>
</TabPanel>
<TabPanel header="Source">
<a href="https://github.com/primefaces/primevue/tree/master/src/views/dropdown" class="btn-viewsource" target="_blank" rel="noopener noreferrer">
<span>View on GitHub</span>
</a>
<CodeHighlight>
<template v-pre>
<template>
<div>
<div class="content-section introduction">
<div class="feature-intro">
<h1>Dropdown</h1>
<p>Dropdown is used to select an item from a list of options.</p>
</div>
</div>
<div class="content-section implementation">
<h3 class="first">Basic</h3>
<Dropdown v-model="selectedCity1" :options="cities" optionLabel="name" placeholder="Select a City" />
<h3>Editable</h3>
<Dropdown v-model="selectedCity2" :options="cities" optionLabel="name" :editable="true"/>
<h3>Advanced with Templating, Filtering and Clear Icon</h3>
<Dropdown v-model="selectedCar" :options="cars" optionLabel="brand" placeholder="Select a Car" :filter="true" :showClear="true">
<template #option="slotProps">
<div class="p-clearfix p-dropdown-car-option">
<img :alt="slotProps.option.brand" :src="'/demo/images/car/' + slotProps.option.brand + '.png'" />
<span>{{slotProps.option.brand}}</span>
</div>
</template>
</Dropdown>
</div>
</div>
</template>
</template>
</CodeHighlight>
<CodeHighlight lang="javascript">
export default {
data() {
return {
selectedCity1: null,
selectedCity2: null,
selectedCar: null,
cities: [
{name: 'New York', code: 'NY'},
{name: 'Rome', code: 'RM'},
{name: 'London', code: 'LDN'},
{name: 'Istanbul', code: 'IST'},
{name: 'Paris', code: 'PRS'}
],
cars: [
{brand: 'Audi', value: 'Audi'},
{brand: 'Bmw', value: 'Bmw'},
{brand: 'Fiat', value: 'Fiat'},
{brand: 'Honda', value: 'Honda'},
{brand: 'Jaguar', value: 'Jaguar'},
{brand: 'Mercedes', value: 'Mercedes'},
{brand: 'Renault', value: 'Renault'},
{brand: 'Volkswagen', value: 'Volkswagen'},
{brand: 'Volvo', value: 'Volvo'}
]
}
}
}
</CodeHighlight>
<CodeHighlight lang="css">
.p-dropdown {
width: 12em;
}
.p-dropdown-car-option {
img {
vertical-align: middle;
margin-right: .5em;
width: 24px;
}
span {
float: right;
margin-top: .125em;
}
}
</CodeHighlight>
</TabPanel>
</TabView>
</div>
</template>