Should you use `ng-bind` or `{{}}` in AngularJS for optimal performance and reactivity?

Ng-bind vs. {{}} in Angular: Performance and Reactivity

In AngularJS, ng-bind and {{}} bindings offer different approaches for displaying dynamic data. Ng-bind is generally considered preferable due to its superior performance and reactivity.

Visibility:

• Ng-bind ensures that the variable is only visible when it is fully loaded. It utilizes ng-cloak to prevent premature content display during bootstrapping.
• {{}} bindings may display uninitialized placeholders in the HTML until Angular initializes, which can be visually distracting.

Performance:

• Ng-bind is a directive that creates a watcher on the bound variable, updating the view only when there is a change.
• {{}} bindings are interpolated in every Angular digest cycle, regardless of whether the value has changed or not, leading to decreased performance.
• Extensive use of {{}} bindings in large applications can result in significant performance degradation.

Reactivity:

• {{}} bindings are dirt checked in every digest cycle, even if the value remains unchanged.
• Ng-bind triggers an update only when the bound variable actually changes, improving responsiveness and performance.

Recommendations:

• Prefer ng-bind over {{}} bindings for performance-critical scenarios.
• Use {{}} bindings only for small chunks of data or when performance is not a concern.
• Consider using Angular 1.3x's bindonce feature (::) to optimize bindings that are not expected to change frequently.

Translation Modules and Filters:

• When using translation modules like Angular-Translate, directives are recommended over bracket annotations for better performance.
• For filter functionality, directives that call custom filters are preferable to {{}} bindings with inline filter expressions.

Conclusion:

Ng-bind provides superior performance and reactivity than {{}} bindings. For optimal application performance, it is advisable to use ng-bind whenever possible, especially in large and data-intensive applications. {{}} bindings should be reserved for smaller-scale dynamic content.

The above is the detailed content of Should you use `ng-bind` or `{{}}` in AngularJS for optimal performance and reactivity?. For more information, please follow other related articles on the PHP Chinese website!