How can I sort a date string using the mat-sort-header?

Question

How can I sort a date string using the mat-sort-header?

I am working with a case table that is built using angular.material, and I am faced with the challenge of adding sorting functionality by date. The issue is that my date data is stored as a string, leading to incorrect sorting. Is there a way to override the default behavior of mat-sort-header to achieve correct sorting for dates?

<div class="example-container mat-elevation-z8">
    <mat-table #table [dataSource]="dataSource" matSort>

        <!-- Reg Date Column -->
        <ng-container matColumnDef="regDate">
            <mat-header-cell *matHeaderCellDef mat-sort-header> Reg Date </mat-header-cell>
            <mat-cell *matCellDef="let element"> {{element.regDate}} </mat-cell>
        </ng-container>
        <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
        <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
    </mat-table>
</div>

Additionally, on the TypeScript side:

sort: MatSort;
@ViewChild(MatSort)
set appBacon(sort : MatSort) {
    this.sort = sort;
    this.dataSource.sort = this.sort;
}
dataSource = new MatTableDataSource([]);

angular typescript angular-material

Answer 1

Answer №1

To solve the issue, pass a Date object in the sortingDataAccessor function to ensure that date objects are sorted correctly.

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
    case 'fromDate': return new Date(item.fromDate);
    default: return item[property];
  }
};

Customize the sortingDataAccessor of MatTableDataSource according to your requirements.

Answer 2

To solve the issue, pass a Date object in the sortingDataAccessor function to ensure that date objects are sorted correctly.

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
    case 'fromDate': return new Date(item.fromDate);
    default: return item[property];
  }
};

Customize the sortingDataAccessor of MatTableDataSource according to your requirements.

Answer 3

Answer №2

Building upon the insights shared by Sagar Kharche, it is important to customize the sortingDataAccessor property in MatTableDataSource for proper data sorting.

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
     case 'fromDate': return new Date(item.fromDate);
     default: return item[property];
  }
};

In this context, 'item' refers to the ObjectName object within 'dataSource: MatTableDataSource< ObjectName>'.

Similarly, 'property' corresponds to the matColumnDef="startDate" attribute being utilized.

Consider an example where an object is defined as:

export interface IPersonInfo {
    name: string,
    position: string,
    startDate: string,
    salary: string
}

The table element for dates may be structured as shown below:

<ng-container matColumnDef="startDate">
    <th mat-header-cell *matHeaderCellDef> Start Date </th>
    <td mat-cell *matCellDef="let element"> {{element.startDate}} </td>
</ng-container>

When sorting by 'Start Date', each object under the startDate column goes through the sorting process individually with 'item' representing the respective values and 'property' referring to the 'startDate' value in matColumnDef="startDate".

The sortingDataAccessor function enables customization for every column:

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
     case 'name': return item.name;
     case 'position': return item.position;
     case 'startDate': return item.startDate;
     case 'salary': return item.salary;
     default: return item[property];
  }
};

Answer 4

Building upon the insights shared by Sagar Kharche, it is important to customize the sortingDataAccessor property in MatTableDataSource for proper data sorting.

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
     case 'fromDate': return new Date(item.fromDate);
     default: return item[property];
  }
};

In this context, 'item' refers to the ObjectName object within 'dataSource: MatTableDataSource< ObjectName>'.

Similarly, 'property' corresponds to the matColumnDef="startDate" attribute being utilized.

Consider an example where an object is defined as:

export interface IPersonInfo {
    name: string,
    position: string,
    startDate: string,
    salary: string
}

The table element for dates may be structured as shown below:

<ng-container matColumnDef="startDate">
    <th mat-header-cell *matHeaderCellDef> Start Date </th>
    <td mat-cell *matCellDef="let element"> {{element.startDate}} </td>
</ng-container>

When sorting by 'Start Date', each object under the startDate column goes through the sorting process individually with 'item' representing the respective values and 'property' referring to the 'startDate' value in matColumnDef="startDate".

The sortingDataAccessor function enables customization for every column:

this.dataSource.sortingDataAccessor = (item, property) => {
  switch (property) {
     case 'name': return item.name;
     case 'position': return item.position;
     case 'startDate': return item.startDate;
     case 'salary': return item.salary;
     default: return item[property];
  }
};

Answer 5

Answer №3

Affirmative, it is possible.

In order to achieve this, you must supply a function for the MatTableDataSource.sortData field.

You can locate the signature and default implementation here.

For example:

customSortData(data: T[], sort: MatSort): T[] {
 // sort.active will indicate if the sorting is active and for which header ID
 // sort.direction will specify whether the sort direction is 'asc' or not
return data.sort((a, b) => {// Your implementation});
}

It is strongly recommended to use a type declaration for table data instead of utilizing an array of any type. You can define your own interface for this purpose.

Trust this information proves beneficial. :)

Answer 6

Affirmative, it is possible.

In order to achieve this, you must supply a function for the MatTableDataSource.sortData field.

You can locate the signature and default implementation here.

For example:

customSortData(data: T[], sort: MatSort): T[] {
 // sort.active will indicate if the sorting is active and for which header ID
 // sort.direction will specify whether the sort direction is 'asc' or not
return data.sort((a, b) => {// Your implementation});
}

It is strongly recommended to use a type declaration for table data instead of utilizing an array of any type. You can define your own interface for this purpose.

Trust this information proves beneficial. :)

Answer 7

Answer №4

Adding on to the response provided by Sagar Kharche.

The sortingDataAccessor function only accepts 'string | number' as return types. If you attempt to return a Date object directly, you will encounter the following error:

'string | number | Date' cannot be assigned to the type '(data: Inventory, sortHeaderId: string) => string | number'.

To resolve this issue, I made the following adjustment:

this.dataSource.sortingDataAccessor = (item, property) => {
  switch(property) {
    case 'dateReceived': return new Date(item.dateReceived).getTime();
    case 'dateOpened': return new Date(item.dateOpened).getTime();
    default: return item[property as keyof Inventory] as string;
  }
}

By using getTime() for dates to ensure a numerical output and returning a string for all other properties by default, I prevented the aforementioned error. Additionally, I included

item[property as keyof Inventory] as string

in the default case to address the issue:

No index signature with a parameter of type 'string' was found on type 'Inventory'.

I also referenced the blog post at:

Answer 8

Adding on to the response provided by Sagar Kharche.

The sortingDataAccessor function only accepts 'string | number' as return types. If you attempt to return a Date object directly, you will encounter the following error:

'string | number | Date' cannot be assigned to the type '(data: Inventory, sortHeaderId: string) => string | number'.

To resolve this issue, I made the following adjustment:

this.dataSource.sortingDataAccessor = (item, property) => {
  switch(property) {
    case 'dateReceived': return new Date(item.dateReceived).getTime();
    case 'dateOpened': return new Date(item.dateOpened).getTime();
    default: return item[property as keyof Inventory] as string;
  }
}

By using getTime() for dates to ensure a numerical output and returning a string for all other properties by default, I prevented the aforementioned error. Additionally, I included

item[property as keyof Inventory] as string

in the default case to address the issue:

No index signature with a parameter of type 'string' was found on type 'Inventory'.

I also referenced the blog post at:

How can I sort a date string using the mat-sort-header?

Answer №1

Answer №2

Answer №3

Answer №4

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