my template cannot read the property of 'id'
我正在尝试使用模板中的事件(click)= " editUser(eb_user)"更新用户信息。无法读取属性\\'id \\'。
这是我收到的错误:
ERROR TypeError: Cannot read property 'id' of undefined
at UsersComponent.push../src/app/component/users/users.component.ts.UsersComponent.editUser
(users.component.ts:32)
at Object.eval [as handleEvent] (UsersComponent.html:24)
at handleEvent (core.js:23107)
at callWithDebugContext (core.js:24177)
at Object.debugHandleEvent [as handleEvent] (core.js:23904)
at dispatchEvent (core.js:20556)
at core.js:21003
at HTMLButtonElement. (platform-browser.js:993)
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask
(zone.js:423)
at Object.onInvokeTask (core.js:17290)
这是模板:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <table class="table table-striped; mat-elevation-z8" style="width: 100%;"> <tr> <th>#</th> <th>Nom</th> <th>Prénom</th> <th>Action</th> </tr> <tr *ngFor ="let user of users"> <td>{{user.id}}</td> <td>{{user.nom}}</td> <td>{{user.prenom}}</td> <td><button class="btn btn-primary" (click)="editUser(eb_user)" style="margin-left: 20px;"> Edit</button>| </td> </tr> |
这是editUser()方法:
1 2 3 4 5 6 | editUser(user: eb_user){ this.users = []; localStorage.removeItem("editUserId"); localStorage.setItem("editUserId", user.id.toString()); this.router.navigate(['edit-user']); }; |
我希望点击事件正常运行
更改为
中使用用户局部变量
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <table class="table table-striped; mat-elevation-z8" style="width: 100%;"> <tr> <th>#</th> <th>Nom</th> <th>Prénom</th> <th>Action</th> </tr> <tr *ngFor ="let user of users"> <td>{{user.id}}</td> <td>{{user.nom}}</td> <td>{{user.prenom}}</td> <td><button class="btn btn-primary" (click)="editUser(user)" style="margin-left: 20px;"> Edit</button>| </td> </tr> |
您需要做的就是传递用户对象并访问ts中的id,或者您也可以直接从html传递id,这是示例
1 2 3 4 5 6 7 8 9 | // here we are passing user object <tr *ngFor ="let user of users"> <td><button class="btn btn-primary" (click)="editUser(user)" style="margin-left: 20px;"> Edit</button></td> </tr> // here we are passing user.id to ts <tr *ngFor ="let user of users"> <td><button class="btn btn-primary" (click)="editUser(user.id)" style="margin-left: 20px;"> Edit</button></td> </tr> |
在HTML
中仅按如下所示调用更改函数
1 | <td><button (click)="editUser(user)" style="margin-left: 20px;"> Edit</button>| </td> |
您需要传递
它应该是
祝你好运!