如何在可能具有重复项的简单值列表上使用 AngularDart ng-repeat [英] How to use AngularDart ng-repeat over a list of simple values possibly with duplicates

问题描述

AngularDart ng-repeat 指令似乎需要唯一值；例如，以下

The AngularDart ng-repeat directive seems to require unique values; e.g., the following

  <li ng-repeat="x in ['Alice', 'Bob', 'Alice']">...</li>

结果

  [NgErr50] ngRepeat error! Duplicates in a repeater are not allowed. 
  Use 'track by' expression to specify unique keys.

假设字符串列表是从某个外部来源获得的，并且不保证值的唯一性，如何避免[NgErr50]?

Assuming that the list of strings is obtained from some external source and that uniqueness of values is not guaranteed, how can the [NgErr50] be avoided?

推荐答案

这有效:

  <li ng-repeat="x in ['Alice', 'Bob', 'Alice'] track by $index">...</li>

有关更多选项，请参阅 ng-repeat API 文档.

For more options, see the ng-repeat API docs.

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