我有以下数据
[
{
"_id": "c9d5ab1a",
"subdomain": "wing",
"domain": "aircraft",
"part_id": "c9d5ab1a",
"info.mimetype": "application/json",
"info.dependent": "parent",
"nested": [
{
"domain": "aircraft",
"_id": "c1859902",
"info.mimetype": "image/jpeg",
"info.dependent": "c9d5ab1a",
"part_id": "c1859902",
"subdomain": "tail"
}
]
},
{
"_id": "1b0b0a26",
"subdomain": "fuel",
"domain": "aircraft",
"part_id": "1b0b0a26",
"info.mimetype": "image/jpeg",
"info.dependent": "no_parent"
}
]
这里如果
"info.dependent": "parent"
那么它是嵌套的,如果 "info.dependent": "no_parent"
然后它没有 child 。我试图创建一个动态表,但我被困在如何使用嵌套表使其可折叠/可扩展。这是我在 stackblitz 上的代码.
<mat-table class=" mat-elevation-z8" [dataSource]="dataSource">
<ng-container [matColumnDef]="col" *ngFor="let col of displayedColumns">
<mat-header-cell *matHeaderCellDef> {{ col }} </mat-header-cell>
<mat-cell *matCellDef="let element"> {{ element[col] }} </mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row;columns:displayedColumns"></mat-row>
</mat-table>
.ts
public data = [
{
"_id": "c9d5ab1a",
"subdomain": "wing",
"domain": "aircraft",
"part_id": "c9d5ab1a",
"info.mimetype": "application/json",
"info.dependent": "parent",
"nested": [
{
"domain": "aircraft",
"_id": "c1859902",
"info.mimetype": "image/jpeg",
"info.dependent": "c9d5ab1a",
"part_id": "c1859902",
"subdomain": "tail"
}
]
},
{
"_id": "1b0b0a26",
"subdomain": "fuel",
"domain": "aircraft",
"part_id": "1b0b0a26",
"info.mimetype": "image/jpeg",
"info.dependent": "no_parent"
}
];
dataSource = new MatTableDataSource([]);
displayedColumns = ['_id', 'subdomain', 'domain', 'part_id', 'info.mimetype', 'info.dependent'];
constructor(){
this.displayedColumns = this.displayedColumns;
this.dataSource = new MatTableDataSource(this.data);
}
所需格式 :-->
嵌套格式如下
row 1 --> _id ,subdomain,domain,info.dependent
当我们单击该特定行时,它必须展开并显示包含列名和行数据的表中的嵌套数据。
"nested": [
{
"domain": "aircraft",
"_id": "c1859902",
"info.mimetype": "image/jpeg",
"info.dependent": "c9d5ab1a",
"part_id": "c1859902",
"subdomain": "tail"
}
]
最佳答案
Note: For those who want to skip the lengthy explanation, here is the StackBlitz example.
你真正想要的是创建一个嵌套的
mat-table
其中所有嵌套表都是可排序的,也可以过滤。首先,由于您需要在嵌套表中使用过滤和排序,您需要创建一个新的
MatTableDataSource
为了它。这可以在您创建主 dataSource
时完成。在 ngOnInit
如下所示。usersData: User[] = [];
USERS.forEach(user => {
if (user.addresses && Array.isArray(user.addresses) && user.addresses.length) {
this.usersData = [...this.usersData, { ...user, addresses: new MatTableDataSource(user.addresses) }];
} else {
this.usersData = [...this.usersData, user];
}
});
this.dataSource = new MatTableDataSource(this.usersData);
从可扩展行 example in the docs ,我们可以看到如何创建一个可扩展的行。在可扩展行中,我们现在将有一个表格以及
Filter
输入。我们将添加一些条件,以便该行仅在存在 addresses
时才可扩展。当下。<div class="example-element-detail" *ngIf="element.addresses?.data.length"
[@detailExpand]="element == expandedElement ? 'expanded' : 'collapsed'">
<div class="inner-table mat-elevation-z8" *ngIf="expandedElement">
<mat-form-field>
<input matInput (keyup)="applyFilter($event.target.value)" placeholder="Filter">
</mat-form-field>
<table #innerTables mat-table #innerSort="matSort" [dataSource]="element.addresses" matSort>
<ng-container matColumnDef="{{innerColumn}}" *ngFor="let innerColumn of innerDisplayedColumns">
<th mat-header-cell *matHeaderCellDef mat-sort-header> {{innerColumn}} </th>
<td mat-cell *matCellDef="let element"> {{element[innerColumn]}} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="innerDisplayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: innerDisplayedColumns;"></tr>
</table>
</div>
</div>
现在只有在有嵌套元素时行才会展开,我们需要为没有
addresses
的用户消除悬停。这是负责添加
background-color
的 CSS悬停时tr.example-element-row:not(.example-expanded-row):hover {
background: #777;
}
所以我们只需要添加
example-element-row
如果该行有 address
,则归类到我们的行.如果它没有地址,则该行不应该是可点击的,并且不应该有一个悬停来向用户表明该行实际上是不可点击的。<tr mat-row *matRowDef="let element; columns: columnsToDisplay;"
[class.example-element-row]="element.addresses?.data.length"
[class.example-expanded-row]="expandedElement === element"
(click)="toggleRow(element)">
</tr>
在
toggleRow
,我们将定义单击模板中的一行时发生的逻辑。我们还将实现sort
当用户单击此函数中的行时。@ViewChildren('innerSort') innerSort: QueryList<MatSort>;
toggleRow(element: User) {
element.addresses && (element.addresses as MatTableDataSource<Address>).data.length ? (this.expandedElement = this.expandedElement === element ? null : element) : null;
this.cd.detectChanges();
this.innerTables.forEach((table, index) => (table.dataSource as MatTableDataSource<Address>).sort = this.innerSort.toArray()[index]);
}
最后,我们需要定义
applyFilter
函数,以便可以过滤嵌套表。@ViewChildren('innerTables') innerTables: QueryList<MatTable<Address>>;
applyFilter(filterValue: string) {
this.innerTables.forEach((table, index) => (table.dataSource as MatTableDataSource<Address>).filter = filterValue.trim().toLowerCase());
}
这是 StackBlitz 上的一个工作示例.
关于javascript - 如何使用 Angular Material 在具有可扩展行的表中创建嵌套垫表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57810336/