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[英]Angular - How to bind textarea input to image in the loop using form
[英]How to bind two arrays using Input/Output Angular?
一个组件(通过@Input())获得2个数组:“用户”
[{Id: 1, Name: 'One'}, {Id: 2, Name: 'Two'}, {Id: 3, Name: 'Three'}]
和“ selectedUsers”:
[{Id: 2, Name: 'Two'}]
并在页面上输出项目:一二三
“ Two”-突出显示,因为它包含在数组“ selectedUsers”中。 如何通过单击将项目从“用户”数组添加到“ selectedUsers”,反之亦然(并突出显示单击的项目)?
父组件:
users = [
{Id: 1, Name: 'One'},
{Id: 2, Name: 'Two'},
{Id: 3, Name: 'Three'}
];
usersSelected = [
{Id: 2, Name: 'Two'}
];
HTML:
<app-item (*ngFor="let u of users", [user]="u")></app-item>
子组件:
@Input() user;
isActive: boolean = false;
toggleClass(){
this.isActive = !this.isActive;
}
的HTML
<p [class.active]="isActive" (click)="toggleClass()">{{user.Name}}</p>
这是另一种尝试,但是应该使用@ Input / @ Output来完成: https : //plnkr.co/edit/cjaij4aQuvN4Tk4ZE0ez?p=preview
为什么需要2个数组? 只需使用名为boolean
(true / false)类型的selected
属性扩展用户类型。 这样可以更清洁/轻松地使用,然后在两个阵列之间复制/删除用户。
users = [
{Id: 1, Name: 'One', IsSelected: false},
{Id: 2, Name: 'Two', IsSelected: true},
{Id: 3, Name: 'Three', IsSelected: false}
];
这允许用于在数组中呈现用户的任何组件直接更新IsSelected
属性。
@Input() user;
get isActive(): boolean {return this.user.IsSelected;}
toggleClass(){
this.user.IsSelected = !this.user.IsSelected;
}
另外我也不认为这是您的html中有效的模板语法。
如果您想使用两个数组以及一个父子组件:
https://plnkr.co/edit/uEKeMRMpLnoR49clxCfo?p=preview
@Component({
selector: 'my-parent',
template: `
<my-child [users]="users" [selected]="selected" ></my-child>
`,
})
export class ParentComponent {
public users = ['one', 'two', 'three' ];
public selected = [];
}
@Component({
selector: 'my-child',
template: `
<div *ngFor="let user of users">
<p [ngClass]="{ selected: isSelected(user) }" (click)="clickOnUser(user)">{{user}}</p>
</div>
`,
styles: [`
.selected {
color: red;
}
`]
})
export class ChildComponent {
@Input()
public users: string[];
@Input()
public selected: string[];
public isSelected(user) {
return this.selected.indexOf(user) !== -1;
}
public clickOnUser(user) {
if (this.selected.indexOf(user) !== -1) {
this.selected.splice(this.selected.indexOf(user), 1);
} else {
this.selected.push(user);
}
}
}
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