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Are complex expressions possible in ng-hide / ng-show?

Posted by: admin November 3, 2017 Leave a comment

Questions:

I want to do so:

ng-hide="!globals.isAdmin && mapping.is_default"

but the expression evaluates always to false.

I do not want to define special function on $scope.

Answers:

Use a controller method if you need to run arbitrary JavaScript code, or you could define a filter that returned true or false.

I just tested (should have done that first), and something like ng-show="!a && b" worked as expected.

Questions:
Answers:

ng-show / ng-hide accepts only boolean values.

For complex expressions it is good to use controller and scope to avoid complications.

Below one will work (It is not very complex expression)

ng-show="User=='admin' || User=='teacher'"

Here element will be shown in UI when any of the two condition return true (OR operation).

Like this you can use any expressions.

Questions:
Answers:

This will work if you do not have too many expressions.

Example: ng-show="form.type === 'Limited Company' || form.type === 'Limited Partnership'"

For any more expressions than this use a controller.

Questions:
Answers:

I generally try to avoid expressions with ng-show and ng-hide as they were designed as booleans, not conditionals. If I need both conditional and boolean logic, I prefer to put in the conditional logic using ng-if as the first check, then add in an additional check for the boolean logic with ng-show and ng-hide

Howerver, if you want to use a conditional for ng-show or ng-hide, here is a link with some examples: Conditional Display using ng-if, ng-show, ng-hide, ng-include, ng-switch

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