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How to use $ index to change class in ng-repeat?

I have a list that is limited to three elements, the first element needs a class blue1

, the second one blue2

, the third one blue3

.

<ul>
    <li ng-repeat="tag in chartTags" class="blue-tag">
        <div class="tag blue1" ng-class="{blue1: tag == 1 }">{{tag.term}}</div>
    </li>
    <!-- <li><div class="tag blue1">item1</div></li>
    <li><div class="tag blue2">item2</div></li>
    <li><div class="tag blue3">item3</div></li> -->
</ul>

Is there a way to write a check like
ng-class="{blue1: tag == 1 || blue2: tag == 2 || blue3: tag == 3 }"

+3


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3 answers


I think you could solve this problem without having to use a track $index

since you don't have duplicates.

Markup



<li ng-repeat="(k, v) in chartTags" class="blue-tag">
     <div ng-class="{blue1: k == 1 , blue2: k == 2 , blue3: k == 3 }">{{v.term}}</div>
</li>
+3


source


use $index

.

<ul>
    <li ng-repeat="tag in chartTags track by $index" class="blue-tag">
        <div class="tag " ng-class="{blue1: $index== 0 ,blue2: $index== 1 ,blue3: $index== 2  }">{{tag.term}}</div>
    </li>

</ul>


See plunker

0


source


first you need to track the index with track by

and use ,

to separate class conditions, not||

like this

<li ng-repeat="tag in chartTags track by $index" class="blue-tag">
      <div class="tag" ng-class="{blue1: $index == 0, blue2: $index == 1, blue3: $index == 2 }">{{tag}}</div>
</li>
0


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