developers.home-assistant/docs/frontend_creating_custom_ui.md

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---
title: "Creating custom UI"
---
### State card
If you would like to use your own [State card](frontend_add_card.md) without merging your code into [home-assistant-polymer](https://github.com/home-assistant/home-assistant-polymer/) you can create your own implementation.
Put the element source file and its dependencies in `www/custom_ui/` directory under your Home Assistant [configuration](https://www.home-assistant.io/docs/configuration/) directory.
For example if creating a state card for the `light` domain named `state-card-my-custom-light` put `state-card-my-custom-light.html` in `www/custom_ui/`.
That file should implement `<state-card-my-custom-light>` tag with Polymer.
In `state-card-my-custom-light.html` you should use `<link rel="import">` to import all the dependencies **not** used by Home Assistant's UI.
Do not import any dependencies used by the Home Assistant UI.
Importing those will work in `development: 1` mode, but will fail in production mode.
1. In the `customize:` section of the `configuration.yaml` file put `custom_ui_state_card: state-card-my-custom-light`.
2. In the `frontend` section use `extra_html_url` to specify the URL to load.
Example:
`configuration.yaml`:
```yaml
homeassistant:
customize:
light.bedroom:
custom_ui_state_card: state-card-my-custom-light
frontend:
extra_html_url:
- /local/custom_ui/state-card-my-custom-light.html
```
`www/custom_ui/state-card-my-custom-light.html`:
```html
<script>
{
// show the version of your custom UI in the HA dev info panel (HA 0.66.0+):
const _NAME = 'My custom light';
const _URL = 'https://home-assistant.io/developers/frontend_creating_custom_ui/';
const _VERSION = '20180312';
if (!window.CUSTOM_UI_LIST) window.CUSTOM_UI_LIST = [];
window.CUSTOM_UI_LIST.push({
name: _NAME,
url: _URL,
version: _VERSION
});
}
</script>
<dom-module id='state-card-my-custom-light'>
<template>
<style>
</style>
<textarea>[[_toStr(stateObj)]]</textarea>
</template>
</dom-module>
<script>
class StateCardMyCustomLight extends Polymer.Element {
static get is() { return 'state-card-my-custom-light'; }
static get properties() {
return {
// Home Assistant object
hass: Object,
// inDialog is true if shown as more-info-card
inDialog: {
type: Boolean,
value: false,
},
// includes state, config and more information of the entity
stateObj: Object,
};
}
_toStr(obj) {
return JSON.stringify(obj, null, 2);
}
}
customElements.define(StateCardMyCustomLight.is, StateCardMyCustomLight);
</script>
```
> Some browsers don't support latest ECMAScript standards, these require a separate ES5 compatible file (`extra_html_url_es5`).
For more possibilities, see the [Custom UI section](https://www.home-assistant.io/cookbook/#user-interface) on our Examples page.
### More info dialog
_Introduced in Home Assistant 0.69._
Similar to the custom State card, if you would like to use your own [More info dialog](frontend_add_more_info.md) you can create your own implementation.
Following a similar example, if creating a more info dialog a light named `more-info-my-custom-light` put `more-info-my-custom-light.html` in `www/custom_ui/`.
1. In the `customize:` section of the `configuration.yaml` file put `custom_ui_more_info: more-info-my-custom-light`.
2. In the `frontend` section use `extra_html_url` to specify the URL to load.
Example:
`configuration.yaml`:
```yaml
homeassistant:
customize:
light.bedroom:
custom_ui_more_info: more-info-my-custom-light
frontend:
extra_html_url:
- /local/custom_ui/more-info-my-custom-light.html
```