Using LINQ with ngFor in Angular 6

Within the component.ts, I extract 15 different lookup list values and assign each one to a list, which is then bound to the corresponding <select> element in the HTML. This process functions correctly.

Is there a method to streamline this code for better readability?

<mat-form-field class="example-full-width">
              <mat-label>Preferred Job</mat-label>
              <mat-select>
                 <mat-option *ngFor="let job of designationList.filter(x=>x.lookupName === 'Designation')" [value]="job.id">
                  {{job.lookupValue}}
                </mat-option> 
              </mat-select>
            </mat-form-field>

Would it be possible to directly apply a where or filter condition within the <select> element so that separate lists are no longer needed for each dropdown menu?

Answer №1

If you need to customize this variable, consider using a custom function.

component.ts

filteredDesignationList(lookupName: string){
    return this.designationList.filter(x=>x.lookupName === lookupName)"
}

component.html

<mat-form-field class="example-full-width">
              <mat-label>Preferred Job</mat-label>
              <mat-select>
                 <mat-option *ngFor="let job of filteredDesignationList('Designation') [value]="job.id">
                  {{job.lookupValue}}
                </mat-option> 
              </mat-select>
            </mat-form-field>

Answer №2

A better approach would be to utilize a Pipe for filtering your data instead of using the filter directly.

<mat-option *ngFor="let job of designationList|filter-pipe" [value]="job.id">
              {{job.lookupValue}}
</mat-option> 

For guidance on implementing a pipe, check out this resource:

https://angular.io/guide/pipes

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