I am using Angular 6 with Angular Material. I am trying to save a selected object or list of selected object from mat-chip and autocomplete. I am able to send string value to fruits[] array but can not able to send selected object in to fruits[] array. Please help me to find a solution. Thanks.
My Demo Project Link: demo code on stackblitz
You can try this solution.
I have created a demo on Stackblitz .
component.html
<mat-form-field class="example-chip-list">
<mat-chip-list #chipList>
<mat-chip *ngFor="let fruit of fruits;let indx=index;" [selectable]="selectable" [removable]="removable" (removed)="remove(fruit,indx)">
{{fruit.name}}
<mat-icon matChipRemove *ngIf="removable">cancel</mat-icon>
</mat-chip>
<input placeholder="New fruit..." #fruitInput [formControl]="fruitCtrl" [matAutocomplete]="auto" [matChipInputFor]="chipList"
[matChipInputSeparatorKeyCodes]="separatorKeysCodes" [matChipInputAddOnBlur]="addOnBlur" (matChipInputTokenEnd)="add($event)">
</mat-chip-list>
<mat-autocomplete #auto="matAutocomplete" (optionSelected)="selected($event)">
<mat-option *ngFor="let fruit of filteredFruits | async" [value]="fruit">
{{fruit.name}}
</mat-option>
</mat-autocomplete>
</mat-form-field>
<pre>{{fruits|json}}</pre>
component.ts
import { COMMA, ENTER } from '@angular/cdk/keycodes';
import { Component, ElementRef, ViewChild } from '@angular/core';
import { FormControl } from '@angular/forms';
import { MatAutocompleteSelectedEvent, MatChipInputEvent } from '@angular/material';
import { Observable } from 'rxjs';
import { map, startWith } from 'rxjs/operators';
/**
* @title Basic chips
*/
@Component({
selector: 'chips-overview-example',
templateUrl: 'chips-overview-example.html',
styleUrls: ['chips-overview-example.css'],
})
export class ChipsOverviewExample {
visible = true;
selectable = true;
removable = true;
addOnBlur = false;
separatorKeysCodes: number[] = [ENTER, COMMA];
fruitCtrl = new FormControl();
filteredFruits: Observable<string[]>;
fruits: any = [];
allFruits: any = [
{
id: 1,
name: 'Apple'
},
{
id: 2,
name: 'Orange'
},
{
id: 3,
name: 'Banana'
},
{
id: 4,
name: 'Malta'
}
];
@ViewChild('fruitInput') fruitInput: ElementRef;
constructor() {
this.filteredFruits = this.fruitCtrl.valueChanges.pipe(
startWith(null),
map((fruit: string | null) => fruit ? this._filter(fruit) : this.allFruits.slice()));
}
add(event: MatChipInputEvent): void {
const input = event.input;
const value = event.value;
// Add our fruit
if ((value || '').trim()) {
this.fruits.push({
id:Math.random(),
name:value.trim()
});
}
// Reset the input value
if (input) {
input.value = '';
}
this.fruitCtrl.setValue(null);
}
remove(fruit, indx): void {
this.fruits.splice(indx, 1);
}
selected(event: MatAutocompleteSelectedEvent): void {
this.fruits.push(event.option.value);
this.fruitInput.nativeElement.value = '';
this.fruitCtrl.setValue(null);
}
private _filter(value: any): string[] {
return this.allFruits.filter(fruit => fruit.id === value.id);
}
}
I've been developing an application which uses autocomplete to select objects from a list. Using a similar approach to Krishna Rathore I found the FormControl valueChanges event wasn't reliably returning a String (sometimes I got an Object instead). My solution was to add an Observable<String[]> and use that for the mat-autocomplete. I also added a property called allowFreeTextAddEngineer to handle cases where your app may allow entries other than those from the autocomplete list. There's a Demo Here.
来源:https://stackoverflow.com/questions/51233913/how-to-save-selected-object-using-mat-chip-and-autocomplete-in-angular-material