Angular Lazy One-time binding support {{ ::value }}

Expressions that start with `::` will be binded once. The rule
that binding follows is that the binding will take the first
not-undefined value at the end of a $digest cycle.

Watchers from $watch, $watchCollection and $watchGroup will
automatically stop watching when the expression(s) are bind-once
and fulfill.

Watchers from text and attributes interpolations will
automatically stop watching when the expressions are fulfill.

All directives that use $parse for expressions will automatically
work with bind-once expressions. E.g.



Before this update, we’d typically render a value in the DOM like so:

{{ title }}

With the new one-time binding syntax

{{ ::title }}


Angular processes the DOM as usual and once the value has been resolved it removes the particular property from it’s internal $$watchers list.

It’s known that Angular becomes slower with around 2,000 bindings due to the process behind dirty-checking. The less we can add to this limit the better, as bindings can add up without us really noticing it!

Using the single binding syntax is easy and most importantly fast. The syntax is clear and concise, and a real benefit to lowering the $$watcher overhead. The less work Angular has to do, the more responsive our applications will become.

130 thoughts on “Angular Lazy One-time binding support {{ ::value }}

  1. I am confused with your post. Is this syntax something that you are proposing angular js team to do? Or is it already available? If it is, how about linking to the relevant documentation of it? If it isn’t, do you have a working implementation? Maybe as a ngBind directive decorator?

    Thanks for clarifying.

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