无法绑定 'ngModel' 也无法在 angular material angular 中呈现 mat-select 6

Question

我在应用程序中使用 Angular Material 并且 Mat-select 根据循环和某些条件显示多次我需要在 ngAfterViewInit()

中的 mat-select 默认情况下 select 数据

形成多个垫子的循环-select

*ngFor="let p of GlobalVariableService.controllsApplicationTypeFields;let filedIndex = index "

我正在创建多个垫子-select 代码

<div class="mt-3 example-full-width"
                                *ngIf="(p.FK_FieldType == '6') && p.FK_PanelId == k.PanelId">
                                <div *ngFor="let list of  GlobalVariableService.listSelectData">
                                    <mat-form-field *ngIf="list.id == p.FieldId" class="w-95">
                                        <mat-select matNativeControl name="ApplicationStatusId"
                                            [(ngModel)]="GlobalVariableService.controllsApplicationTypeFields[filedIndex].DefaultValue"
                                            required>
                                            <mat-option *ngFor="let l of list.FieldListItems" [value]="l.ItemId">
                                                {{GlobalVariableService.isEn === true ? l.FieldText : l.FieldTextAr}}
                                            </mat-option>
                                        </mat-select>
                                    </mat-form-field>
                                </div>
                            </div>

Ts.code 是

 for (var ls = 0; ls < this.GlobalVariableService.controllsApplicationTypeFields.length; ls++) {
              if (Control == this.GlobalVariableService.controllsApplicationTypeFields[ls].FieldId) {
                 this.GlobalVariableService.controllsApplicationTypeFields[ls].DefaultValue = this.GlobalVariableService.ApplicationValues[i].Value;
                debugger;
                console.log("selected value is");
                console.log(this.GlobalVariableService.controllsApplicationTypeFields[ls].DefaultValue);
              }
            }

如果我在 itemid 中显示值，则 Itemid 在 ngModel 中是正确的但不呈现 Mat-select 请帮助

Answer 1

也许 ?

import { FormsModule } from '@angular/forms';

@NgModule({
    imports: [
         FormsModule      
    ]

无法绑定 'ngModel' 也无法在 angular material angular 中呈现 mat-select 6

can't binding 'ngModel' also not rendering mat-select in angular material angular 6

typescript

angular-material

angular

angular6

angular8