[英]How to make a select option as default selected in angular using ng-multiselect-dropdown?
所以在這里我從數據庫中獲取數據並將其存儲到事件數組中。 此事件數組數據使用 ng-multiselect-dropdown 顯示在 book-ticket.component.html 上。 從這里開始選擇一個選項,此數據對應於存儲在 this.event 中的所選項目。
我正在將 id 從另一個組件傳遞給這個 book-ticket.component,在這里我們使用
this.idByAllEvents = this.activatedRoute.snapshot.params.id;
book-ticket 組件的 HTML 部分是
<div class="form-group">
<label>Event</label>
<ng-multiselect-dropdown [placeholder]="'Select the Event'" [data]="this.events" name="event"
[(ngModel)]="this.event" [settings]="dropdownSettings1">
</ng-multiselect-dropdown>
</div>
book-ticket 組件的 .ts 部分是
export class BookTicketComponent implements OnInit {
user:User;
event:Event;
offer:Offer;
// offer:string;
// event:string;
idByAllEvents: string; // This is coming from all events page
price:number;
percentageReduce:number;
offers:Offer[];
events:Event[];
dropdownSettings1: IDropdownSettings;
dropdownSettings2: IDropdownSettings;
selectedItem: any[];
constructor(private Userservice:UserService,private Offerservice:OfferService,
private Eventservice:EventService, private router:Router,
private activatedRoute:ActivatedRoute) {
this.idByAllEvents = this.activatedRoute.snapshot.params.id;
console.log(this.idByAllEvents);
this.user = new User();
// this.offer = new Offer();
// this.event = new Event();
// this.offer = new Offer();
// this.event = new Event();
this.selectedItem = [];
}
ngOnInit() {
this.dropdownSettings1 = {
singleSelection: true,
idField: '_id',
textField: 'name',
selectAllText: 'Select All',
unSelectAllText: 'UnSelect All',
itemsShowLimit: 3,
allowSearchFilter: true,
closeDropDownOnSelection: true,
};
this.Eventservice.GetEvents().subscribe(res => {
this.events = res;
this.justExecute();
this.Offerservice.GetOffers().subscribe(res => {
this.offers = res
})
});
justExecute(){
console.log(this.idByAllEvents);
console.log(this.events);
for (let index = 0; index < this.events.length; index++) {
const element = this.events[index]._id;
console.log(element);
if(element == this.idByAllEvents){
this.selectedItem.push(this.events[element]);
// this.selectedItem = this.events[element]
}
}
console.log(this.selectedItem);
}
}
SaveData(form:NgForm) {
if(form.valid) {...}
}
}
我希望在 HTML 頁面上默認選擇與 this.idByAllEvents 對應的選項。 但是下拉列表顯示了 this.events 的所有選項。
我嘗試通過函數 justExecute 使用設置 selectedItem 但console.log(this.selectedItem)
給出了未定義的數組。 如果我們在 selectedItem 中獲得與 idByAllEvents 對應的值,那么我們可以在 html 頁面上使用[(ngModel)]="selectedItem"
來選擇該值。
我們應該如何做到這一點。 有沒有其他方法可以做到這一點。
如果ng-multiselect-dropdown
用於響應式表單的FormGroup
,請確保包含[ngModelOptions]='{standalone: true}'
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