[英]Angular2 init abstract class with object literal
export abstract class GridColumn {
public field?: string;
public sortField?: string;
public header?: string;
public footer?: string;
public sortable?: any = true;
public editable?: boolean = false;
public filter?: boolean = true;
public filterMatchMode?: string = 'contains';
public filterPlaceholder?: string;
public style?: any;
public styleClass?: string;
public hidden?: boolean = false;
public selectionMode?: string = 'multiple';
public frozen?: boolean;
}
例如,执行此操作仅返回具有那些已定义属性的对象。
private gridConf: GridColumn = <GridColumn>{
field: "test2",
header: "Test2",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
selectionMode: "single"
};
我想要的是GridColumn
类型的对象,它具有所有定义的属性和所有默认值。
这不起作用:
private gridConf: GridColumn = GridColumn({
field: "test2",
header: "Test2",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
selectionMode: "single"
});
构造函数会迫使我写一个很长的代码,而我总是必须按特定顺序添加所有属性。
最终目标将是使用具有以下所有顺序的默认和/或定义属性的类似内容:
private columns: Array<GridColumn> = [
<GridColumn>{
field: "test",
selectionMode: "single",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
header: "Test"
},
<GridColumn>{
field: "test2",
header: "Test2",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
selectionMode: "single"
}
];
我能找到的最接近的“ hack”是删除摘要并添加,其中字段引用自身:
public constructor(
fields?: GridColumn) {
if (fields) Object.assign(this, fields);
}
这实际上是不可能的,但是我想您可以找到一种解决方法。 并不是说这是最佳做法,但是如果您真的想要它,这就是您可以做到的方式。 仅供参考,仅当在非抽象类上使用new GridColumn()
,才会初始化默认值:
网格列
export class GridColumn implements IGridColumn {
public sortable: boolean = true;
public editable: boolean = false;
public filter: boolean = true;
public filterMatchMode: string = 'contains';
public hidden: boolean = false;
public selectionMode: string = 'multiple';
public field: string;
public sortField: string;
public header: string;
public footer: string;
public filterPlaceholder: string;
public style: any;
public styleClass: string;
public frozen: boolean;
constructor(data: IGridColumn = {}){
Object.assign(this, data);
}
}
IGridColumn
export interface IGridColumn {
public field?: string;
public sortField?: string;
public header?: string;
public footer?: string;
public sortable?: boolean;
public editable?: boolean;
public filter?: boolean;
public filterMatchMode?: string;
public filterPlaceholder?: string;
public style?: any;
public styleClass?: string;
public hidden?: boolean;
public selectionMode?: string;
public frozen?: boolean;
}
用法
private columns: Array<GridColumn> = [
new GridColumn(<IGridColumn>{
field: "test",
selectionMode: "single",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
header: "Test"
}),
new GridColumn(<IGridColumn>{
field: "test2",
header: "Test2",
filter: true,
filterMatchMode: "contains",
filterPlaceholder: "Search from Test",
sortable: true,
selectionMode: "single"
})
];
让我再次强调,我认为这不是最佳做法。 甚至以I开头的接口都被命名为:D
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