40 lines
929 B
Markdown
40 lines
929 B
Markdown
---
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title: Pattern.on()
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---
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A pattern's `on()` method allows you to attach a function to one of the
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pattern's [lifecycle hooks](/reference/hooks/). It takes the
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lifecycle hook's name as the first argument and the function as the second.
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This method will then be triggered by the lifecycle hook.
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<Note>Since FreeSewing v2.19, this method is chainable as it returns the Pattern object</Note>
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## Pattern.on() signature
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```js
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Pattern pattern.on(string hook, function method)
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```
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<Tip>
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Refer to [the Lifecycle hooks documentation](/reference/hooks/) for a list
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of all avaialble lifecycle hooks, as well as the signature of the function you
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should pass it.
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</Tip>
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## Pattern.on() example
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```js
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pattern.on('preRender', function(svg) {
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svg.style += "svg { background: yellow;}";
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})
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```
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Your pattern now has a yellow background.
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<Tip>
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The [plugin guide](/guides/plugins/) contains more info on how you can use hooks
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</Tip>
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