How can one ensure that the element declared in the "let" clause is displayed in an HTML Angular template?

I am working on a component that can render a mat-table. Each cell can have a specified value, or if it is present, the component calls an ngTemplateOutlet and passes it a rendering function obtained from the calling object.

export interface ColumnConfig {
  name: string;
  headerTemplate?: TemplateRef<Element>;
  headerLabel?: string;
  headerClasses?:string;
  bodyTemplate?: TemplateRef<Element>;
  bodyClasses?:string;
  visible?: boolean;
  align?: string;
}
<mat-cell mat-cell *matCellDef="let element">
    <ng-container *ngIf="!column.bodyTemplate; else bodyTemplate">
        {{ element[column.name] }}
    </ng-container>
    <ng-template #bodyTemplate [ngTemplateOutlet]="column.bodyTemplate!" [ngTemplateOutletContext]="{ $implicit: element }"></ng-template>
</mat-cell>

After updating many project dependencies such as typescript, angular, tslint->eslint, I am now encountering an error that was not present before.

Object literal may only specify known properties, and '"$implicit"' does not exist in type 'Element'.

I am struggling to figure out how to accurately define the element which is specified by the "let" of the "matCellDef".

Thank you!

Answer №1

Maybe this solution will do the trick

<mat-cell mat-cell *matCellDef="let item">
    <ng-container *ngIf="!col.template; else templateName" [ngTemplateOutlet]="templateName" [ngTemplateOutletContext]="{ element: item }">
        {{ item[col.title] }}
    </ng-container>
    <ng-template #templateName let-element="item">
...
    </ng-template>
</mat-cell>

Answer №2

After some experimentation, I was able to solve the issue by reorganizing the ngTemplateOutletContext definition within a TypeScript method:

<mat-cell mat-cell *matCellDef="let element">
    <ng-container *ngIf="!column.bodyTemplate; else bodyTemplate">
        {{ element[column.name] }}
    </ng-container>
    <ng-template #bodyTemplate [ngTemplateOutlet]="column.bodyTemplate!" [ngTemplateOutletContext]="generateContext(element)"></ng-template>
</mat-cell>

The TS code snippet is as follows:

public generateContext(element:any):any{
    return {
      $implicit: element
    };
  }

If you have any suggestions on how to achieve this using only HTML definitions, please feel free to share your insights.

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