ember/template-no-duplicate-id

April 20, 2026 · View on GitHub

💼 This rule is enabled in the 📋 template-lint-migration config.

Valid HTML requires that id attribute values are unique.

This rule does a basic check to ensure that id attribute values are not the same.

Examples

This rule forbids the following:

<template><div id='id-00'></div><div id='id-00'></div></template>

This rule allows the following:

<template><div id={{this.divId}}></div></template>

<template><div id='concat-{{this.divId}}'></div></template>

<template>
  <MyComponent as |inputProperties|>
    <Input id={{inputProperties.id}} />
    <div id={{inputProperties.abc}} />
  </MyComponent>

  <MyComponent as |inputProperties|>
    <Input id={{inputProperties.id}} />
  </MyComponent>
</template>

Migration

For best results, it is recommended to generate id attribute values when they are needed, to ensure that they are not duplicates.

References