How to include or exclude an attribute from the HTML in Angular 4

问题

I am using angular 4 with angular materials to construct a table. I want the mat-sort-header to be added conditionally on the following template.

<mat-header-cell *matHeaderCellDef mat-sort-header>Id</mat-header-cell>

I have tried the following code:

<mat-header-cell *matHeaderCellDef [mat-sort-header]=" column!='id' ? column : false ">Id</mat-header-cell>

But it still adds the sorting header in the table for this column.

My overall table looks as follows, and is working fine, except for the sorting header issue:

  <mat-table #table1 [dataSource]="records" matSort class="mat-cell">

    <ng-container *ngFor="let column of keys" [matColumnDef]="column">
      <mat-header-cell *matHeaderCellDef [mat-sort-header]=" column!='actions' ? column : false ">
        <p *ngIf=" column!='actions' ">{{ column }}</p>
        <button *ngIf=" column=='actions' " mat-icon-button color="primary" (click)="functionA()">
          <mat-icon class="indigo-icon" aria-label="Example icon-button with a heart icon">add</mat-icon>
        </button>

      </mat-header-cell>
      <mat-cell *matCellDef="let row; let i=index;">
        <p *ngIf=" column!='actions' ">{{ row[column] }}</p>
        <button *ngIf=" column=='actions' " mat-icon-button color="accent" (click)="functionA()">
          <mat-icon class="indigo-icon" aria-label="Edit">edit</mat-icon>
        </button>

        <button *ngIf=" column=='actions' " mat-icon-button color="accent" (click)="functionA()">
          <mat-icon class="indigo-icon" aria-label="Delete">delete</mat-icon>
        </button>

      </mat-cell>
    </ng-container>

    <mat-header-row *matHeaderRowDef="keys"></mat-header-row>
    <mat-row *matRowDef="let row; columns: keys;"></mat-row>
  </mat-table>

回答1:

Well, I solved it as follow:

<mat-header-cell *matHeaderCellDef [mat-sort-header]=" column!='actions' ? column : null " [disabled]=" column=='actions' ? true : false " >

Needed to bind the disabled property.

回答2:

You can do like this using ng-if-else

<ng-container *ngIf="column=='actions'; else noSort">
  <mat-header-cell *matHeaderCellDef mat-sort-header />          
</ng-container>

<ng-template #noSort>
  <mat-header-cell *matHeaderCellDef />         
</ng-template>

来源：https://stackoverflow.com/questions/48802332/how-to-include-or-exclude-an-attribute-from-the-html-in-angular-4

标签

angular

angular-material

angular-material2