Assuming that toShowVar is undefined, which of these options would be more costly?
<span ng-bind="toShowVar" ng-show="toShowVar"></span>
or
<span ng-bind="toShowVar"></span>
The latter option would clearly not display anything on the screen if the variable is undefined.
In order to clarify the situation, it is important to note that ng-show and ng-bind operate at the same level of priority. There is no clear advantage for using ng-show in terms of performance optimization.
When it comes to hiding content, utilizing ng-show may not be necessary. This directive will still monitor changes to the specified variable (in this case, toShowVar) and execute its functionality accordingly (such as modifying the display property to 'none' by applying the ng-hide class).
For example, if you set ng-show='false' and later update toShowVar with new text elsewhere in your code, a debugger inspection of the DOM will reveal that the updated text remains accessible. Therefore, it can be concluded that using ng-show does not yield any significant performance advantages in this scenario.
On the other hand, employing ng-if (which operates at a higher priority than both mentioned directives) will remove the element from the DOM, preventing subsequent watchers from being active until the element is re-rendered in the DOM. While using ng-if involves additional processing, it proves to be more efficient compared to using both ng-bind and ng-show together.
It is worth noting that only ng-bind and ng-bind ng-show may present differences in the user interface. If a span element is affected by CSS properties (such as inline styles or parent hierarchy), it may still be visible in the UI even if it appears empty (e.g., due to having a border). Otherwise, visually, both directives provide similar outcomes.
The code
<span ng-bind="toShowVar" ng-show="toShowVar"></span>toShowVar will be bound to span even if it is empty. On the other hand, using ng-if="toShowVar" would be slightly less expensive because Angular does not include the span element in the DOM if toShowVar is falsy. Therefore, here are the options listed in decreasing order of efficiency:
<span ng-bind="toShowVar" ng-show="toShowVar"></span><span ng-bind="toShowVar"></span><span ng-bind="toShowVar" ng-if="toShowVar"></span>When ng-bind="toShowVar" is used, there is no need for ng-show="toShowVar", as ng-bind alone will display an empty span if toShowVar is undefined.
Using both methods becomes more costly because ng-show="toShowVar" redundantly checks the value of toShowVar and attempts to apply the .ng-hide class.
However, the distinction lies in the fact that with just ng-bind, the span appears on the page with no content, while employing ng-show will still render it but hide it using .ng-hide.
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