相关疑难解决方法(0)

我正在尝试从API加载值后更新表单值.我尝试使用该*ngIf技术,但即使设置了表单,表单也不可见.

我无法共享整个项目,但这里是组件模板和控制器

模板

<div class="page-title">
  <h3> Edit news </h3>
</div>
<div class="partner-add-form">
  <ng-container *ngIf='newsForm'>
    <form action="" [formGroup]='newsForm' (ngSubmit)="onSubmit()">
      <div class="row  ">
        <div class="input-field col s12 tooltip">
          <input formControlName='title' [id]="'title'" [type]="'text'">
          <label [for]="'title'">Title</label>
          <validator-errors [control]='newsForm.get("title")'></validator-errors>
        </div>
        <div class="input-field col s12 tooltip">
          <textarea class="materialize-textarea" formControlName='content' [id]="'content'"></textarea>
          <label [for]="'content'">Content</label>
          <validator-errors [control]='newsForm.get("content")'></validator-errors>
        </div>
        <div class="input-field col s12 margin-reset">
          <mat-form-field class="full-width">
            <mat-select [formControl]='newsForm.controls["partner_id"]'>
              <mat-option disabled selected>Categories</mat-option>
              <mat-option *ngFor="let partner of partners.data" [value]="partner.id">
              {{ partner.name }} </mat-option>
            </mat-select>
          </mat-form-field>
          <validator-errors [control]='newsForm.controls["partner_id"]'></validator-errors>
        </div>
        <div class="file-field …