基于字符计数的Angular条件类

Question

如何根据模型的字符数有条件地应用类?

例如:

$scope.sample = 555;

<span ng-class="{ 'char3': sample.length == 3 }">{{ sample }}</span>

Answer 1

您可以将样本转换为字符串并检查其长度:

<span ng-class="{ char3: (sample + '').length == 3 }">{{ sample }}</span>

Answer 2

<span ng-class="(sample.length === 3) ? 'three':'notthree'">{{ sample }}</span>