ng2-iq-select2

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ng2-iq-select2
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Angular 2 native select 2 implementation based on bootstrap 4
  • Easily filter on a remote webservice (can be used with a local list too)
  • Works with ids or complete entities
  • Single or multiple modes
  • Forms integration
  • MIT License
  • Last bootstrap 3 compatible version is 7.0.0

Take a look at the demo page
Usage example:
app.module.ts
import { IqSelect2Module } from 'ng2-iq-select2';

@NgModule({
    declarations: [..],
    imports: [.., IqSelect2Module, ...],
    providers: [..]

html file
<form [formGroup]="form">
    <iq-select2 css="form-control input-sm" 
                formControlName="country" 
                [dataSourceProvider]="listCountries"
                [selectedProvider]="loadFromIds"
                [iqSelect2ItemAdapter]="adapter"></iq-select2>
</form>

html file (custom template)
<form [formGroup]="form">
  <iq-select2 css="form-control input-sm" 
                formControlName="country" 
                [dataSourceProvider]="listCountries"
                [selectedProvider]="loadFromIds"
                [iqSelect2ItemAdapter]="adapter">
    <div *iq-select2-template="let item = $entity; let i = $index">
      <span [style.color]="item.color">[{{item.code}}]</span> {{item.name}}
    </div>
  </iq-select2>
</form>
Exposed internal variable to bind $item, $entity, $id, $index

example typescript file
export class Example {
    form: FormGroup;
    listCountries: (term: string) => Observable<Country[]>;
    loadFromIds: (ids: string[]) => Observable<Country[]>;
    adapter: (entity: Country) => IqSelect2Item;
//
    constructor(private countriesService: CountryService,
                private formBuilder: FormBuilder){
    
    }
//
    ngOnInit() {
        this.listCountries = (term: string) => this.countriesService.listCountries(term);
        this.loadFromIds = (ids: string[]) => this.countriesService.loadCountriesFromIds(ids);
        this.adapter = (country: Country) => {
            return {
                id: country.id,
                text: country.name,
                entity: country
            };
        }
        this.form = this.formBuilder.group({
            country: null
        });
    }
};

IqSelect2Item
interface IqSelect2Item {
    id: string;
    text: string;
    entity?: any; // only needed when referenceMode === 'entity'
}

Messages
export class Messages {
    
     static readonly PARTIAL_COUNT_VAR; // Variable to be replaced by the amount of results being shown
     static readonly TOTAL_COUNT_VAR; // Variable to be replaced by the total count of results
    
    moreResultsAvailableMsg?: string;
    noResultsAvailableMsg?: string;
}

Configuration options (Inputs and Outputs)
@Input() dataSourceProvider: (term: string, selected?: any) => Observable>: the function to get the data based on user input. Selected ids or entities are provided in case you want to avoid getting those results again (this could be useful when setting the "resultsCount" property).
@Input()
selectedProvider: (ids: string) => Observable>: the function to get previously selected data when referenceMode === 'id'
@Input()
iqSelect2ItemAdapter: (entity: T) => IqSelect2Item: the function to adapt any entity to a IqSelect2Item
@Input()
referenceMode: 'id' | 'entity'. Allows to specify if you need the whole entity or just the id.
@Input()
multiple: 'true' | 'false'. Allows to select multiple options from the list. The form value is returned as an array.
@Input()
clientMode: 'true' | 'false'. If set to true only one request will be sent to the data provider and subsequent searching will happen on the client.
@Input()
searchDelay: ms until request is effectively triggered
@Input()
placeholder: text to show until a search is performed
@Input()
disabled: boolean to control the disabled state of the component
@Input()
minimumInputLength: the minimum input length at which the component will request data to the provider
@Input()
resultsCount: total count of results produced after entering the search term. A message suggesting further filtering will appear if the results count is greather than the result list shown
@Input()
messages: Messages: class to provide custom messages to the component
@Input()
css: css classes to be applied
@Input()
searchIcon: css icon on the right of the input
@Input()
deleteIcon: css icon to be used to remove selected option (In single mode)
@Input()
badgeColor: badge bootstrap color: 'primary' | 'secondary' | 'success' | 'danger' | 'warning' | 'info' | 'light' | 'dark'
@Output()
onSelect(item: IqSelect2Item): event triggered when an item is selected
@Output()
onRemove(item: IqSelect2Item): event triggered when an item is removed
Reference mode examples
// form.value example with referenceMode === 'id':
{
    'item': 1
}

// form.value example with referenceMode === 'entity':
{
    'item':  {
        'id': 1,
        'property1': 'value',
        ...
    }
}

// form.value example with referenceMode === 'id' and multiple === 'true':
{
    'item': [1,2,3]
}

// form.value example with referenceMode === 'entity' and multiple === 'true':
{
    'item': [{
        'id': 1,
        'property1': 'value',
        ...
    },{
        'id': 2,
        'property1': 'value2',
        ...
    },{
        'id': 3,
        'property1': 'value3',
        ...
    }]
}