v-if vs. v-for Precedence 破壊的変更
Overview
- BREAKING: If used on the same element,
v-ifwill have higher precedence thanv-for
Introduction
Two of the most commonly used directives in Vue.js are v-if and v-for. So it's no surprise that there comes a time when developers want to use both together. While this is not a recommended practice, there may be times when this is necessary, so we wanted to provide guidance for how it works.
2.x Syntax
In 2.x, when using v-if and v-for on the same element, v-for would take precedence.
3.x Syntax
In 3.x, v-if will always have the higher precedence than v-for.
Migration Strategy
It is recommended to avoid using both on the same element due to the syntax ambiguity.
Rather than managing this at the template level, one method for accomplishing this is to create a computed property that filters out a list for the visible elements.
Migration build flag: COMPILER_V_IF_V_FOR_PRECEDENCE