AutoComplete

AutoComplete is an input component that provides real-time suggestions when being typed.

Import #


import { AutoCompleteModule } from 'primeng/autocomplete';

Basic #

AutoComplete uses ngModel for two-way binding, requires a list of suggestions and a completeMethod to query for the results. The completeMethod gets the query text as event.query property and should update the suggestions with the search results.


<p-autoComplete [(ngModel)]="selectedItem" [suggestions]="suggestions" (completeMethod)="search($event)"></p-autoComplete>

Reactive Forms #

AutoComplete can also be used with reactive forms. In this case, the formControlName property is used to bind the component to a form control.


<form [formGroup]="formGroup">
    <p-autoComplete formControlName="selectedCountry" [suggestions]="filteredCountries" (completeMethod)="filterCountry($event)" field="name"></p-autoComplete>
</form>

Dropdown #

Enabling dropdown property displays a button next to the input field where click behavior of the button is defined using dropdownMode property that takes blank or current as possible values. blank is the default mode to send a query with an empty string whereas current setting sends a query with the current value of the input.


<p-autoComplete [(ngModel)]="selectedCountry" [dropdown]="true" [suggestions]="filteredCountries" (completeMethod)="filterCountry($event)" field="name"></p-autoComplete>

Objects #

AutoComplete can also work with objects using the field property that defines the label to display as a suggestion. The value passed to the model would still be the object instance of a suggestion. Here is an example with a Country object that has name and code fields such as {name: "United States", code:"USA"}.


<p-autoComplete [(ngModel)]="selectedCountry" [suggestions]="filteredCountries" (completeMethod)="filterCountry($event)" field="name"></p-autoComplete>

Template #

item template allows displaying custom content inside the suggestions panel. The local ng-template variable passed to the ng-template is an object in the suggestions array.


<p-autoComplete [(ngModel)]="selectedCountryAdvanced" [suggestions]="filteredCountries" 
    (completeMethod)="filterCountry($event)" field="name" [dropdown]="true">
        <ng-template let-country pTemplate="item">
            <div class="flex align-items-center gap-2">
                <img src="https://primefaces.org/cdn/primeng/images/demo/flag/flag_placeholder.png" [class]="'flag flag-' + country.code.toLowerCase()" style="width: 18px"/>
                <div>{{ country.name }}</div>
            </div>
        </ng-template>
</p-autoComplete>

Grouped #

Option grouping is enabled when group property is set to true. group template is available to customize the option groups. All templates get the option instance as the default local template variable.


<p-autoComplete [(ngModel)]="selectedCity" [group]="true" [suggestions]="filteredGroups" (completeMethod)="filterGroupedCity($event)" [dropdown]="true">
    <ng-template let-group pTemplate="group">
        <div class="flex align-items-center">
            <img src="https://primefaces.org/cdn/primeng/images/demo/flag/flag_placeholder.png" [class]="'mr-2 flag flag-' + group.value" style="width: 20px" />
            <span>{{ group.label }}</span>
        </div>
    </ng-template>
</p-autoComplete>

Force Selection #

ForceSelection mode validates the manual input to check whether it also exists in the suggestions list, if not the input value is cleared to make sure the value passed to the model is always one of the suggestions.


<p-autoComplete [(ngModel)]="selectedCountry" [forceSelection]="true" [suggestions]="filteredCountries" (completeMethod)="filterCountry($event)" field="name"></p-autoComplete>

Virtual Scroll #

Virtual scrolling is an efficient way of rendering the options by displaying a small subset of data in the viewport at any time. When dealing with huge number of options, it is suggested to enable virtual scrolling to avoid performance issues. Usage is simple as setting virtualScroll property to true and defining virtualScrollItemSize to specify the height of an item.


<p-autoComplete [(ngModel)]="selectedItem" [virtualScroll]="true" [suggestions]="filteredItems" [virtualScrollItemSize]="34" (completeMethod)="filterItems($event)" field="label" [dropdown]="true"> </p-autoComplete>

Multiple #

Multiple mode is enabled using multiple property used to select more than one value from the autocomplete. In this case, value reference should be an array.


<span class="p-fluid">
    <p-autoComplete [(ngModel)]="selectedItems" [suggestions]="items" (completeMethod)="filterCountry($event)" [multiple]="true"></p-autoComplete>
</span>

Float Label #

A floating label appears on top of the input field when focused.

Float Label


<span class="p-float-label">
    <p-autoComplete [(ngModel)]="selectedItem" [suggestions]="suggestions" (completeMethod)="search($event)" inputId="float-label"></p-autoComplete>
    <label for="float-label">Float Label</label>
</span>

Disabled #

When disabled is present, the element cannot be edited and focused.


<p-autoComplete [(ngModel)]="selectedItem" [suggestions]="suggestions" (completeMethod)="search($event)" [disabled]="true"></p-autoComplete>

Invalid #

Invalid state style is added using the ng-invalid and ng-dirty class to indicate a failed validation.


<p-autoComplete [(ngModel)]="selectedItem" [suggestions]="suggestions" class="ng-invalid ng-dirty" (completeMethod)="search($event)"></p-autoComplete>

Style #

Following is the list of structural style classes, for theming classes visit theming page.

Name	Element
p-autocomplete	Container element
p-autocomplete-panel	Overlay panel of suggestions.
p-autocomplete-items	List container of suggestions.
p-autocomplete-item	List item of a suggestion.
p-autocomplete-token	Element of a selected item in multiple mode.
p-autocomplete-token-icon	Close icon element of a selected item in multiple mode.
p-autocomplete-token-label	Label of a selected item in multiple mode.
p-autocomplete-loader	Loader icon.

Accessibility #

Screen Reader

Value to describe the component can either be provided via label tag combined with inputId prop or using ariaLabelledBy, ariaLabel props. The input element has combobox role in addition to aria-autocomplete, aria-haspopup and aria-expanded attributes. The relation between the input and the popup is created with aria-controls and aria-activedescendant attribute is used to instruct screen reader which option to read during keyboard navigation within the popup list.

In multiple mode, chip list uses listbox role whereas each chip has the option role with aria-label set to the label of the chip.

The popup list has an id that refers to the aria-controls attribute of the input element and uses listbox as the role. Each list item has option role and an id to match the aria-activedescendant of the input element.


<label for="ac1">Username</label>
<p-autoComplete inputId="ac1"></p-autoComplete>

<span id="ac2">Email</span>
<p-autoComplete ariaLabelledBy="ac2"></p-autoComplete>

<p-autoComplete ariaLabel="City"></p-autoComplete>

Keyboard Support

Key	Function
tab	Moves focus to the input element when popup is not visible. If the popup is open and an item is highlighted then popup gets closed, item gets selected and focus moves to the next focusable element.
up arrow	Highlights the previous item if popup is visible.
down arrow	Highlights the next item if popup is visible.
enter	Selects the highlighted item and closes the popup if popup is visible.
home	Highlights the first item if popup is visible.
end	Highlights the last item if popup is visible.
escape	Hides the popup.

Chips Input Keyboard Support

Key	Function
backspace	Deletes the previous chip if the input field is empty.
left arrow	Moves focus to the previous chip if available and input field is empty.

Chip Keyboard Support

Key	Function
left arrow	Moves focus to the previous chip if available.
right arrow	Moves focus to the next chip, if there is none then input field receives the focus.
backspace	Deletes the chips and adds focus to the input field.

AutoComplete API

API defines helper props, events and others for the PrimeNG AutoComplete module.

AutoComplete #

AutoComplete is an input component that provides real-time suggestions when being typed.

Properties #

Defines the input properties of the component.

name	type	default	description
minLength	number	1	Minimum number of characters to initiate a search.
delay	number	300	Delay between keystrokes to wait before sending a query.
style	Object	null	Inline style of the component.
panelStyle	Object	null	Inline style of the overlay panel element.
styleClass	string	null	Style class of the component.
panelStyleClass	string	null	Style class of the overlay panel element.
inputStyle	Object	null	Inline style of the input field.
inputId	string	null	Identifier of the focus input to match a label defined for the component.
inputStyleClass	string	null	Inline style of the input field.
placeholder	string	null	Hint text for the input field.
readonly	boolean	false	When present, it specifies that the input cannot be typed.
disabled	boolean	false	When present, it specifies that the component should be disabled.
scrollHeight	string	200px	Maximum height of the suggestions panel.
lazy	boolean	false	Defines if data is loaded and interacted with in lazy manner.
virtualScroll	boolean	false	Whether the data should be loaded on demand during scroll.
virtualScrollItemSize	number	null	Height of an item in the list for VirtualScrolling.
virtualScrollOptions	ScrollerOptions	null	Whether to use the scroller feature. The properties of scroller component can be used like an object in it.
maxlength	number	null	Maximum number of character allows in the input field.
name	string	null	Name of the input element.
required	boolean	false	When present, it specifies that an input field must be filled out before submitting the form.
size	number	null	Size of the input field.
appendTo	any	null	Target element to attach the overlay, valid values are "body" or a local ng-template variable of another element (note: use binding with brackets for template variables, e.g. [appendTo]="mydiv" for a div element having #mydiv as variable name).
autoHighlight	boolean	false	When enabled, highlights the first item in the list by default.
forceSelection	boolean	false	When present, autocomplete clears the manual input if it does not match of the suggestions to force only accepting values from the suggestions.
type	string	text	Type of the input, defaults to "text".
autoZIndex	boolean	true	Whether to automatically manage layering.
baseZIndex	number	0	Base zIndex value to use in layering.
ariaLabel	string	null	Defines a string that labels the input for accessibility.
dropdownAriaLabel	string	null	Defines a string that labels the dropdown button for accessibility.
ariaLabelledBy	string	null	Specifies one or more IDs in the DOM that labels the input field.
dropdownIcon	string	null	Icon class of the dropdown icon.
unique	boolean	true	Ensures uniqueness of selected items on multiple mode.
group	boolean	false	Whether to display options as grouped when nested options are provided.
completeOnFocus	boolean	false	Whether to run a query when input receives focus.
showClear	boolean	false	When enabled, a clear icon is displayed to clear the value.
field	string	null	Field of a suggested object to resolve and display.
dropdown	boolean	false	Displays a button next to the input field when enabled.
showEmptyMessage	boolean	false	Whether to show the empty message or not.
dropdownMode	string	blank	Specifies the behavior dropdown button. Default "blank" mode sends an empty string and "current" mode sends the input value.
multiple	boolean	false	Specifies if multiple values can be selected.
tabindex	number	null	Index of the element in tabbing order.
dataKey	string	null	A property to uniquely identify a value in options.
emptyMessage	string	null	Text to display when there is no data. Defaults to global value in i18n translation configuration.
showTransitionOptions	string	.12s cubic-bezier(0, 0, 0.2, 1)	Transition options of the show animation.
hideTransitionOptions	string	.1s linear	Transition options of the hide animation.
autofocus	boolean	false	When present, it specifies that the component should automatically get focus on load.
autocomplete	string	off	Used to define a string that autocomplete attribute the current element.
optionGroupChildren	string	items	Name of the options field of an option group.
optionGroupLabel	string	label	Name of the label field of an option group.
overlayOptions	OverlayOptions	null	Options for the overlay element.
suggestions	any[]	null	An array of suggestions to display.
itemSize	number	null	Element dimensions of option for virtual scrolling.
optionLabel	string	null	Property name or getter function to use as the label of an option.
id	string	null	Unique identifier of the component.
searchMessage	string	null	Text to display when the search is active. Defaults to global value in i18n translation configuration.
emptySelectionMessage	string	null	Text to display when filtering does not return any results. Defaults to global value in i18n translation configuration.
selectionMessage	string	null	Text to be displayed in hidden accessible field when options are selected. Defaults to global value in i18n translation configuration.
autoOptionFocus	boolean	true	Whether to focus on the first visible or selected element when the overlay panel is shown.
selectOnFocus	boolean	false	When enabled, the focused option is selected.
searchLocale	boolean	false	Locale to use in searching. The default locale is the host environment's current locale.
optionDisabled	string	null	Property name or getter function to use as the disabled flag of an option, defaults to false when not defined.
focusOnHover	boolean	false	When enabled, the hovered option will be focused.

Emitters #

Defines emit that determine the behavior of the component based on a given condition or report the actions that the component takes.

name	parameters	description
completeMethod	event : AutoCompleteCompleteEvent	Callback to invoke to search for suggestions.
onSelect	event : AutoCompleteSelectEvent	Callback to invoke when a suggestion is selected.
onUnselect	event : AutoCompleteUnselectEvent	Callback to invoke when a selected value is removed.
onFocus	event : Event	Callback to invoke when the component receives focus.
onBlur	event : Event	Callback to invoke when the component loses focus.
onDropdownClick	event : AutoCompleteDropdownClickEvent	Callback to invoke to when dropdown button is clicked.
onClear	event : Event	Callback to invoke when clear button is clicked.
onKeyUp	event : KeyboardEvent	Callback to invoke on input key up.
onShow	event : Event	Callback to invoke on overlay is shown.
onHide	event : Event	Callback to invoke on overlay is hidden.
onLazyLoad	event : AutoCompleteLazyLoadEvent	Callback to invoke on lazy load data.

Templates #

Defines the templates used by the component.

name	parameters	description
item	context : { $implicit: any, // Option. index: number, // Option index. }	Custom item template.
group	context : { $implicit: any, // Option group. }	Custom group template.
selectedItem	context : { $implicit: any, // Selected value. }	Custom selected item template.
header	null	Custom header template.
empty	null	Custom empty template.
footer	null	Custom footer template.
loader	context : { $implicit: ScrollerOptions, // Virtual scroller options. }	Custom loader template.
removetokenicon	null	Custom remove token icon template.
loadingicon	null	Custom loading icon template.
clearicon	null	Custom clear icon template.
dropdownicon	null	Custom dropdown icon template.

Events #

Defines the custom events used by the component's emitters.

AutoCompleteCompleteEvent #

Custom complete event.

name	type	description
originalEvent	Event	Browser event.
query	string	Selected option value.

AutoCompleteDropdownClickEvent #

Custom click event.

name	type	description
originalEvent	Event	Browser event.
query	string	Selected option value.

AutoCompleteSelectEvent #

Custom select event.

name	type	description
originalEvent	Event	Browser event.
value	any	Selected value.

AutoCompleteUnselectEvent #

Custom unselect event.

name	type	description
originalEvent	Event	Browser event.
value	any	Removed value.

AutoCompleteLazyLoadEvent #

Custom lazy load event.

name	type	description
first	any	First element in viewport.
last	any	Last element in viewport.