# KeyCode Modifiers
breaking

# Overview

Here is a quick summary of what has changed:

BREAKING: Using numbers, i.e. keyCodes, as v-on modifiers is no longer supported
BREAKING: config.keyCodes is no longer supported

In Vue 2, keyCodes were supported as a way to modify a v-on method.

<!-- keyCode version -->
<input v-on:keyup.13="submit" />

<!-- alias version -->
<input v-on:keyup.enter="submit" />

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In addition, you could define your own aliases via the global config.keyCodes option.

Vue.config.keyCodes = {
  f1: 112
}

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<!-- keyCode version -->
<input v-on:keyup.112="showHelpText" />

<!-- custom alias version -->
<input v-on:keyup.f1="showHelpText" />

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Since KeyboardEvent.keyCode has been deprecated (opens new window), it no longer makes sense for Vue 3 to continue supporting this as well. As a result, it is now recommended to use the kebab-case name for any key you want to use as a modifier.

<!-- Vue 3 Key Modifier on v-on -->
<input v-on:keyup.delete="confirmDelete" />

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As a result, this means that config.keyCodes is now also deprecated and will no longer be supported.

For those using keyCode in their codebase, we recommend converting them to their kebab-cased named equivalents.