What is the method for substituting one text with another using two-way data binding?

I implemented two different cases in my Mat-Table. When there is no data, the user will see a message saying "No Data Found". However, if the user enters text in the filter search, the "No Data Found" message should be hidden and replaced with the entered text. Do you have any insights on how to achieve this functionality?

Here is the code snippet I used:

// Filter input
<input matInput #filter (keyup)="applyFilter($event.target.value)" placeholder="Search" />

 <!-- Triggered by the filter -->
          <div class="no-search-results" [hidden]="isTableHasData">
            <p>You searched for <span class="filter-value">"{{ filter.value }}"</span>, but we couldn't find any results.</p>
          </div>

          <!--  Triggered because there is no data in the backend -->
          <div class="no-data" *ngIf="dataSource !== null && dataSource.data !== null && dataSource.data.length === 0">
            <p>No Data Found</p>
          </div>

// TypeScript Code
public applyFilter(filterValue: string) {
    filterValue = filterValue.trim();
    filterValue = filterValue.toLowerCase();
    this.dataSource.filter = filterValue;
    if (this.dataSource.filteredData.length > 0) {
      this.isTableHasData = true;
    } else {
      this.isTableHasData = false;
    }
  }

Answer №1

In situations where the data is missing and the filtering input field is left empty, display a message indicating "no data". Conversely, if the table contains information but the search yields no results, show a message indicating the absence of any matching search terms.

This functionality can be achieved by utilizing the *ngIf directive.

Answer №2

To display the table only when there is data available, you can utilize If Else statements like shown below. If there is no data, a custom message will be displayed.

<div *ngIf="dataSource !== null && dataSource.data !== null && dataSource.data.length === 0; else noData" class="no-search-results">
            <p>You searched for <span class="filter-value">"{{ filter.value }}"</span>, but unfortunately, we couldn't find any results.</p>
          </div>
  <ng-template #noData>
          <div class="no-data">
            <p>No Data Found</p>
          </div>

  </ng-template>

For a live example, you can check this stackblitz link: https://stackblitz.com/edit/angular-mat-table-filter-predicate-zs7bgd?file=app%2Ftable-filtering-example.html

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