Angular2 * ng如果检查模板中的对象数组长度 [英] Angular2 *ngIf check object array length in template
问题描述
参考 https://angular.io/docs/ts/最新/指南/displaying-data.html 并堆叠 和 组件: 任何帮助都会很棒.
这首先检查 Refered to https://angular.io/docs/ts/latest/guide/displaying-data.html and stack How to check empty object in angular 2 template using *ngIf still getting syntax error self context undefined. If I remove *ngIf condition then I am getting values in teamMembers if I push some value into it so I can access values in teamMembers. my Tries : and Component : Any help would be great.
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throwing syntax error
<div class="col-md-12">
<h4>Team Members</h4>
<ul class="avatar" *ngFor="let member of teamMembers">
<li><a href=""><gravatar-image [size]="80" [email]="member.email"></gravatar-image></a></li>
</ul>
</div>
</div>
@Component({
selector: 'pbi-editor',
})
export class AppComponent implements OnInit {
teamMembers: User[];
<div class="row" *ngIf="teamMembers?.length > 0">
teamMembers
是否具有值,并且teamMembers
没有值,它不会尝试访问undefined
的length
,因为条件的第一部分已经失败./p>teamMember
object is [ ] array
i am trying to check condition array is empty by size.<div class="row" *ngIf="(teamMembers | json) != '{}'">
<div class="row" *ngIf="teamMembers.length > 0"> //Check length great than
throwing syntax error
<div class="col-md-12">
<h4>Team Members</h4>
<ul class="avatar" *ngFor="let member of teamMembers">
<li><a href=""><gravatar-image [size]="80" [email]="member.email"></gravatar-image></a></li>
</ul>
</div>
</div>
@Component({
selector: 'pbi-editor',
})
export class AppComponent implements OnInit {
teamMembers: User[];
<div class="row" *ngIf="teamMembers?.length > 0">
teamMembers
has a value and if teamMembers
doesn't have a value, it doesn't try to access length
of undefined
because the first part of the condition already fails.