Question

我正在尝试将值推入数组，然后在视图中显示。一切正常，但我想在项目中添加自动增量编号。我在data.json文件中有以下数组

[   
    {"id":1,"name":"John","gender":"Male"},
    {"id":2,"name":"Smith","gender":"Male"},
    {"id":3,"name":"Linda","gender":"Female"},
    {"id":4,"name":"Jerry","gender":"Female"}
]

在user.service档案

中

private JsonDirectory: string = "assets/data.json"
constructor(private _httpReference: Http){}
getUsers(){
    return this._httpReference.get(this.JsonDirectory)
        .map((responseReference:Response) => responseReference.json());
}

在user.component中我将输入值推送到pressEnter事件的数组中，因为我只有一个输入值所以我已经推送但是还有id并且它应该自动递增。以下是我正在尝试的代码

UserArray = [];
constructor(private userService: UserService, private _location: Location){}
show_value: string = '';
    OnPressEnter(show_value: string){ 
        var inputValue = show_value;
        this.show_value = show_value;
        this.UserArray.push({"id":5,"name":inputValue }); 
    }

你可以看到id是静态的我想让它变得动态。

<ul>
<li *ngFor="let userCourse of UserArray" (click)="onSelect(userCourse.name)">
<span>{{userCourse.id}}</span> | <a style="cursor:pointer;">{{userCourse.name}} </a>
</li>
</ul>

Answer 1

你可以像这样使用

  OnPressEnter(show_value: string){ 
            var inputValue = show_value;
            this.show_value = show_value;
            this.UserArray.push({"id":this.UserArray.length+1,"name":inputValue }); 
        }

如何使用angular在数组中按项目时添加自动增量数？

1 个答案: