---
title: Pattern.on()
---
The `Pattern.on()` method allows you to attach a function to one of the
pattern's [lifecycle hooks](/reference/hooks/). It takes the
lifecycle hook's name as the first argument and the function as the second.
This method will then be triggered by the lifecycle hook.
:::noteThis method is chainable as it returns the Pattern object:::
## Pattern.on() signature
```js
Pattern pattern.on(string hook, function method)
```
:::tip
Refer to [the Lifecycle hooks documentation](/reference/hooks/) for a list
of all available lifecycle hooks, as well as the signature of the function you
should pass it.
:::
## Pattern.on() example
```js
pattern.on('preRender', function(svg) {
svg.style += "svg { background: yellow;}";
})
```
Your pattern now has a yellow background.
:::tip
The [plugin guide](/guides/plugins/) contains more info on how you can use hooks
:::
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