Adding dynamic css class using lit-html

[Ronn Ross]

I'm attempting to dynamically apply a css class using a property. For example I want to pass in a string:

<my-button kind="primary">some stuff</my-button>

My component looks like so: 

class MyButton extends LitElement {

static get properties() {

return {

kind: String

}

}

constructor() {

super();

}

render({ kind }) {

return html`

<style>

.primary {

color: red;

}

</style>

<button on-click="${() => console.log('working')}"

class="${kind}"

type="button">

Press Me!

</button>

`

}

}

When I hard-code the class on the element it works. Any ideas? 

Thanks!

[Justin Fagnani]

Neither lit-html or LitElement really help here yet, because the host element is not under control of its own template.

Right now using className or classList in render() is the best option.

render() {

  this.className = this.kind;

}

or if you have other classes you need to not disturb:

const kinds = ['primary', 'secondary'];

render() {

  kinds.forEach((k) => this.classList.toggle(k, this.kind === k));

}

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