How Can I Implement Export Functionality for the Angular Material Table into CSV Format?

Are you struggling to export your Angular Material Table data into a CSV file? Do you want to provide your users with a convenient way to download and analyze your table data? Look no further! In this comprehensive guide, we’ll walk you through the step-by-step process of implementing export functionality for your Angular Material Table into CSV format.

Prerequisites

• A basic understanding of Angular and Angular Material
• An existing Angular Material Table component in your project
• The desire to make your users happy with a convenient export feature

Step 1: Prepare Your Table Data

Before we dive into the export functionality, make sure your Angular Material Table is properly configured and displays the data you want to export. If you’re using a data source, ensure it’s correctly bound to your table.

import { Component,OnInit } from '@angular/core';
import { MatTableDataSource } from '@angular/material/table';

@Component({
  selector: 'app-table',
  template: `
    <mat-table [dataSource]="dataSource">
      <ng-container matColumnDef="column1">
        <mat-header-cell *matHeaderCellDef> Column 1 </mat-header-cell>
        <mat-cell *matCellDef="let element"> {{element.column1}} </mat-cell>
      </ng-container>
      <ng-container matColumnDef="column2">
        <mat-header-cell *matHeaderCellDef> Column 2 </mat-header-cell>
        <mat-cell *matCellDef="let element"> {{element.column2}} </mat-cell>
      </ng-container>
      <mat-header-row *matHeaderRowDef="['column1', 'column2']"></mat-header-row>
      <mat-row *matRowDef="let row; columns: ['column1', 'column2']"></mat-row>
    </mat-table>
  `
})
export class TableComponent implements OnInit {
  dataSource = new MatTableDataSource<any>([
    { column1: 'Value 1', column2: 'Value 2' },
    { column1: 'Value 3', column2: 'Value 4' },
    { column1: 'Value 5', column2: 'Value 6' }
  ]);

  ngOnInit(): void {
  }
}

Step 2: Create a CSV Export Function

Create a new function in your component that will handle the CSV export. This function will take the table data, convert it to a CSV string, and then trigger a file download.

exportCSV(): void {
  const csvData = this.dataSource.data.map(row => Object.values(row).join(','));

  const csvString = csvData.join('\n');
  const blob = new Blob([csvString], { type: 'text/csv' });
  const url = window.URL.createObjectURL(blob);

  const anchor = document.createElement('a');
  anchor.download = 'table-export.csv';
  anchor.href = url;
  anchor.click();

  window.URL.revokeObjectURL(url);
}

Let’s break down what this function does:

• `map()` is used to extract the values from each row in the data source
• `Object.values()` is used to get an array of values from each row object
• `join()` is used to concatenate the values into a single string with commas separating each value
• The resulting array of strings is then joined with newline characters (`\n`) to create the full CSV string
• A `Blob` object is created with the CSV string and a `type` of `text/csv`
• A URL is created from the blob using `window.URL.createObjectURL()`
• An anchor element is created and its `download` attribute is set to the desired file name
• The anchor’s `href` attribute is set to the URL, and the `click()` method is called to trigger the file download
• Finally, the URL is revoked using `window.URL.revokeObjectURL()` to free up memory

Step 3: Add a Button to Trigger the Export

Now that we have our export function, let’s add a button to our table component to trigger the export.

<button mat-raised-button (click)="exportCSV()">Export to CSV</button>
<mat-table [dataSource]="dataSource">
  
</mat-table>

This button uses the `mat-raised-button` directive from Angular Material to style the button. The `(click)` event is bound to our `exportCSV()` function.

Step 4: Customize Your Export (Optional)

If you want to customize your export, you can modify the `exportCSV()` function to suit your needs. Here are some examples:

Example 1: Export Specific Columns

If you only want to export specific columns, you can modify the `map()` function to select the desired columns.

const csvData = this.dataSource.data.map(row => [
  row.column1,
  row.column2
].join(','));

Example 2: Format Date Columns

If you have date columns, you may want to format them in a specific way for the export. You can use the `toDate()` function and a date formatting library like `moment.js`.

import * as moment from 'moment';

const csvData = this.dataSource.data.map(row => [
  row.column1,
  moment(row.dateColumn).format('YYYY-MM-DD')
].join(','));

Example 3: Add Custom Headers

You can add custom headers to your CSV export by modifying the `csvString` variable.

const csvString = 'Column 1,Column 2\n' + csvData.join('\n');

Conclusion

And that’s it! You’ve successfully implemented export functionality for your Angular Material Table into CSV format. Your users can now easily download and analyze your table data.

Remember to customize the export function to fit your specific needs, and don’t hesitate to reach out if you have any questions or need further assistance.

Functionality	Description
Export to CSV	Exports the table data into a CSV file for easy downloading and analysis
Customizable	Allows for customization of the export function to fit specific needs, such as selecting specific columns or formatting date columns
Easy to Implement	Requires minimal code changes to implement, making it easy to integrate into your existing Angular Material Table component

By following these steps and customizing the export function to fit your needs, you can provide a valuable feature to your users and make your Angular Material Table even more powerful and user-friendly.

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Get ready to unleash the power of data exportation and take your Angular Material Table to the next level!