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You can use angular's function called angular. isUndefined(value) returns boolean. Show activity on this post. if(!a) { // do something when `a` is not undefined, null, ''. }
How to check if a variable string is empty or undefine or null in Angular. In template HTML component: We can use the ngIf directive to check empty null or undefined. In this example, if stringValue is empty or null, or undefined, It prints the empty message.
ng-if is better in this regard. Using it in place of ng-show will prevent the heavy content from being rendered in the first place if the expression is false. However, its strength is also its weakness, because if the user hides the chart and then shows it again, the content is rendered from scratch each time.
You should check for !test, here is a fiddle showing that.
<span ng-if="!test">null</span>
See the correct way with your example:
<div ng-if="!test.view">1</div>
<div ng-if="!!test.view">2</div>
Regards, Nicholls
You can also use ng-template, I think that would be more efficient while run time :)
<div ng-if="!test.view; else somethingElse">1</div>
<ng-template #somethingElse>
<div>2</div>
</ng-template>
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