MatTabNavBar 未显示箭头 [英] MatTabNavBar not showing arrows

问题描述

我注意到 MatTabNavBar 与常规 MatTabGroup 的行为不同，如果容器对于选项卡来说太小，则显示箭头时.

I've noticed that the MatTabNavBar is behaving different from a regular MatTabGroup when it comes to showing the arrows if the container gets too small for the tabs.

我使用官方文档构建了 MatTabNavBar 和 MatTabGroup，但您可以在这里看到 MatTabGroup 显示箭头而 MatTabNavBar 没有.

I used the official documentation to build the MatTabNavBar and MatTabGroup, but you can see here that the MatTabGroup is showing arrows and the MatTabNavBar is not.

https://angular-gaio5u.stackblitz.io

用于 MatTabGroup 的模板:

Template used for MatTabGroup:

<mat-tab-group>
  <mat-tab
    *ngFor="let tab of tabs"
    [label]="tab.label"
  >
    {{ tab.label }}
  </mat-tab>
</mat-tab-group>

用于 MatTabNavBar 的模板:

Template used for MatTabNavBar:

<nav mat-tab-nav-bar>
  <a
    mat-tab-link
    *ngFor="let tab of tabs"
    [active]="isActive(tab)"
    (click)="setActive(tab)"
  >
    {{ tab.label }}
  </a>
</nav>

...所以我错过了什么吗?！预期结果是 MatTabNavBar 显示与 MatTabGroup 相同的箭头.

...so am I missing anything?! The expected result is the MatTabNavBar showing the same arrows as MatTabGroup.

推荐答案

仅供参考，这似乎在 @angular/material@8.2.x 和更新版本中已修复.

FYI, this seems to be fixed in versions @angular/material@8.2.x and newer.

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