Vue: [Suggestion for Performance] `.once` directive argument for v-for, :class etc

[rstoenescu]

It would be great if all Vue directives would support .once: v-for.once, :class.once, v-if.once for situations where you know the binded data won't change. I imagine this will increase performance.

[yyx990803]

Sounds like a good idea.

[blake-newman]

Idea is nice! Additionally would it be good to allow this API level of the directive, for custom directives that may only ever need a single bind.

{
  once: true,
}

[yyx990803]

@blake-newman if you supply only bind without update then it is "once" already :)

[blake-newman]

@yyx990803 Very true.. doh! We have now implemented this into 2.0, and the plan is to keep this functionality to 2.0 only.

Closing: @vuejs/collaborators reopen if there is a change of plan.

[liming9515]

This proposal has been accepted yet?

[posva]

Not in Vue 1. In Vue 2 you have v-once