Utilizing a fixed array as the data source for a mat-table

Question

Utilizing a fixed array as the data source for a mat-table

I am currently working on implementing the Angular Material table into my project. I am encountering an issue when trying to define the [dataSource]="data", even though I am using code similar to the examples provided.

My question may seem basic, but my table data is just a simple array of objects. How can I successfully integrate this?

For illustration purposes, let's consider that my data is structured like this:

public data = [{ ID: 1, Code: "Hi" }, { ID: 2, Code: "Bye" }];

Below is the current code I am using:

<div class="example-container mat-elevation-z8">
    <mat-table #table [dataSource]="data">
        <ng-container matColumnDef="number">
            <mat-header-cell *matHeaderCellDef> Number </mat-header-cell>
            <mat-cell *matCellDef="let row"> {{ row.ID }} </mat-cell>
        </ng-container>

        <ng-container matColumnDef="Code">
            <mat-header-cell *matHeaderCellDef> Code </mat-header-cell>
            <mat-cell *matCellDef="let row">{{row.Code}}</mat-cell>
        </ng-container>

        <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
        <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
    </mat-table>
</div>

angular typescript angular-material

Answer 1

Answer №1

The resources provided for understanding the Angular Material Table were somewhat lacking in clarity. I believe I can offer a more concise explanation of the examples presented.

<mat-table [dataSource]=”data”>
  ...
</mat-table>

[dataSource]=”data”: This corresponds to your data array containing the information you wish to display. In this case, it is simply referred to as 'data'.
There is no need to create a new DataSource instance as suggested in Pierre Mallet's response; using an array will suffice. However, if you choose to do so, the most straightforward approach would be (based on the example provided):
```
public dataSource = new MatTableDataSource(this.data);
```
- The advantages of utilizing/extending the DataSource type are outlined here in the documentation.

<ng-container matColumnDef="userName">
  <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
  <mat-cell *matCellDef="let user"> {{user.name}} </mat-cell>
</ng-container>

matColumnDef="userName": This serves as a distinctive identifier for this ng-container. Note that there are no [] around 'matColumnDef', indicating that this is not a binding. The name chosen has no relation to the displayed data and may be customized as needed.
```
<mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
```
: This section is fairly straightforward. Replace 'Name' with any desired string that should appear at the top of the column.
The sequence of ng-containers does not impact their display order. Furthermore, defining these ng-containers here does not guarantee their display; visibility and order are determined later with *matHeaderRowDef.
```
<mat-cell *matCellDef="let user"> {{user.name}} </mat-cell>
```
: Here, you specify the data displayed within this column. The variable 'user' is defined h̲e̲r̲e̲ and is not directly linked to your dataset. You have the flexibility to assign any name to this variable, but the property referenced ('name') must exist in the bound datasource.

<mat-header-row *matHeaderRowDef="columnsToDisplay"></mat-header-row>

```
*matHeaderRowDef="columnsToDisplay"
```
: This determines which ng-container headers will be exhibited. 'columnsToDisplay' is an array of strings corresponding to the identifiers assigned to the ng-containers. The order of identifiers within this array dictates the appearance sequence of column headers. Omitting an identifier from the array results in its exclusion from the display.

<mat-row *matRowDef="let myRowData; columns: columnsToDisplay"></mat-row>

This code renders the rows within the specified columns. With the exception of 'columnsToDisplay', variables are declared in this section.

Answer 2

The resources provided for understanding the Angular Material Table were somewhat lacking in clarity. I believe I can offer a more concise explanation of the examples presented.

<mat-table [dataSource]=”data”>
  ...
</mat-table>

[dataSource]=”data”: This corresponds to your data array containing the information you wish to display. In this case, it is simply referred to as 'data'.
There is no need to create a new DataSource instance as suggested in Pierre Mallet's response; using an array will suffice. However, if you choose to do so, the most straightforward approach would be (based on the example provided):
```
public dataSource = new MatTableDataSource(this.data);
```
- The advantages of utilizing/extending the DataSource type are outlined here in the documentation.

<ng-container matColumnDef="userName">
  <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
  <mat-cell *matCellDef="let user"> {{user.name}} </mat-cell>
</ng-container>

matColumnDef="userName": This serves as a distinctive identifier for this ng-container. Note that there are no [] around 'matColumnDef', indicating that this is not a binding. The name chosen has no relation to the displayed data and may be customized as needed.
```
<mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
```
: This section is fairly straightforward. Replace 'Name' with any desired string that should appear at the top of the column.
The sequence of ng-containers does not impact their display order. Furthermore, defining these ng-containers here does not guarantee their display; visibility and order are determined later with *matHeaderRowDef.
```
<mat-cell *matCellDef="let user"> {{user.name}} </mat-cell>
```
: Here, you specify the data displayed within this column. The variable 'user' is defined h̲e̲r̲e̲ and is not directly linked to your dataset. You have the flexibility to assign any name to this variable, but the property referenced ('name') must exist in the bound datasource.

<mat-header-row *matHeaderRowDef="columnsToDisplay"></mat-header-row>

```
*matHeaderRowDef="columnsToDisplay"
```
: This determines which ng-container headers will be exhibited. 'columnsToDisplay' is an array of strings corresponding to the identifiers assigned to the ng-containers. The order of identifiers within this array dictates the appearance sequence of column headers. Omitting an identifier from the array results in its exclusion from the display.

<mat-row *matRowDef="let myRowData; columns: columnsToDisplay"></mat-row>

This code renders the rows within the specified columns. With the exception of 'columnsToDisplay', variables are declared in this section.

Answer 3

Answer №2

Even if you opt for static data, you will still need to create a new DataSource.

When using mat-table, a real DataSource is always required in the @Input. Since DataSource is an abstract class, you must create a class that inherits from it.

This custom DataSource class must have a "connect" method implemented, which should return an Observable containing the data you want to display.

In your scenario, something like this should work:

// In your component

interface MyDataType {
    ID: number;
    Code: string;
}

export class StaticDataSource extends DataSource<MyDataType> {
  constructor(private staticData: MyDataType[]) {
    super();
  }

  connect(): Observable<MyDataType[]> {
    return Observable.of(this.staticData);
  }

  disconnect() {}
}
...
this.staticDataSource = new StaticDataSource(data);

// In your template
 <mat-table #table [dataSource]="staticDataSource">

Answer 4

Even if you opt for static data, you will still need to create a new DataSource.

When using mat-table, a real DataSource is always required in the @Input. Since DataSource is an abstract class, you must create a class that inherits from it.

This custom DataSource class must have a "connect" method implemented, which should return an Observable containing the data you want to display.

In your scenario, something like this should work:

// In your component

interface MyDataType {
    ID: number;
    Code: string;
}

export class StaticDataSource extends DataSource<MyDataType> {
  constructor(private staticData: MyDataType[]) {
    super();
  }

  connect(): Observable<MyDataType[]> {
    return Observable.of(this.staticData);
  }

  disconnect() {}
}
...
this.staticDataSource = new StaticDataSource(data);

// In your template
 <mat-table #table [dataSource]="staticDataSource">

Utilizing a fixed array as the data source for a mat-table

Answer №1

Answer №2

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