24 lines
511 B
Markdown
24 lines
511 B
Markdown
---
|
|
title: setIfUnset()
|
|
---
|
|
|
|
```js
|
|
Attributes attributes.setIfUnset(string key, string value)
|
|
```
|
|
|
|
Sets the attribute identified by `key` to value `value` but only if it's currently unset (`undefined`).
|
|
|
|
<Tip>
|
|
|
|
This will never overwrite any value and thus is a safe way to set attributes
|
|
|
|
</Tip>
|
|
|
|
```js
|
|
let { Path, paths } = part.shorthand();
|
|
|
|
// This will render as: class="classA"
|
|
paths.demo = new Path();
|
|
paths.demo.attributes.set('class', 'classA');
|
|
paths.demo.attributes.setIfUnset('class', 'classB');
|
|
```
|