Question - Why should not use if and for directives together on the same element?
Answer -
It is recommended not to use v-if on the same element as v-for. Because v-for directive has a higher priority than v-if.
There are two cases where developers try to use this combination,
To filter items in a list
For example, if you try to filter the list using v-if tag,
v-for="user in users"
v-if="user.isActive"
:key="user.id"
>
{{ user.name }}
This can be avoided by preparing the filtered list using computed property on the initial list
computed: {
activeUsers: function () {
return this.users.filter(function (user) {
return user.isActive
})
}
}
...... //
...... //
v-for="user in activeUsers"
:key="user.id">
{{ user.name }}
To avoid rendering a list if it should be hidden
For example, if you try to conditionally check if the user is to be shown or hidden
v-for="user in users"
v-if="shouldShowUsers"
:key="user.id"
>
{{ user.name }}
This can be solved by moving the condition to a parent by avoiding this check for each user
v-for="user in users"
:key="user.id"
>
{{ user.name }}
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