valid-v-for.md

Pattern: Malformed v-for directive

Issue: -

Description

This rule reports v-for directives in the following cases:

• The directive has that argument. E.g. <div v-for:aaa></div>
• The directive has that modifier. E.g. <div v-for.bbb></div>
• The directive does not have that attribute value. E.g. <div v-for></div>
• If the element which has the directive is a custom component, the component does not have v-bind:key directive. E.g. <your-component v-for="item in list"></your-component>
• The v-bind:key directive does not use the variables which are defined by the v-for directive. E.g. <div v-for="x in list" :key="foo"></div>

If the element which has the directive is a reserved element, this rule does not report it even if the element does not have v-bind:key directive because it's not fatal error. [require-v-for-key] rule reports it.

<template>
  <!-- ✓ GOOD -->
  <div v-for="todo in todos"/>
  <MyComponent
    v-for="todo in todos"
    :key="todo.id"
  />
  <div
    v-for="todo in todos"
    :is="MyComponent"
    :key="todo.id"
  />

  <!-- ✗ BAD -->
  <div v-for/>
  <div v-for:aaa="todo in todos"/>
  <div v-for.bbb="todo in todos"/>
  <div
    v-for="todo in todos"
    is="MyComponent"
  />
  <MyComponent v-for="todo in todos"/>
  <MyComponent
    v-for="todo in todos"
    :key="foo"
  />
</template>

Further Reading

• eslint-plugin-vue - valid-v-for