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| import { Component, h, Prop, State, Watch } from '@stencil/core'; | |
| const Constants = { | |
| baseClassname: 'my-button', | |
| } | |
| @Component({ | |
| tag: 'my-button', | |
| styleUrl: 'button.scss' | |
| }) | |
| export class Button { | |
| /** | |
| * Show number of clicks | |
| */ | |
| @Prop({attribute: 'show-click'}) showNbOfClicks: boolean = false; | |
| /** | |
| * Theme | |
| */ | |
| @Prop() theme: "primary" | "secondary" = "primary"; | |
| @Watch('theme') | |
| validateTheme(newValue: string) { | |
| const themes = ['primary', 'secondary']; | |
| const themeIsValid = themes.indexOf(newValue) > -1; | |
| if (!themeIsValid) { throw new Error('theme: not a valid theme') } | |
| } | |
| /** | |
| * Number of clicks | |
| */ | |
| @State() numberOfClicks: number = 0; | |
| componentWillLoad() { | |
| this.validateTheme(this.theme); | |
| } | |
| handleClick = () => { | |
| this.nbOfClicks += 1; | |
| } | |
| render() { | |
| const { theme, showNbOfClicks, numberOfClicks } = this; | |
| const classes = [ | |
| `${Constant.baseClassname}`, | |
| theme && `${Constant.baseClassname}--${theme}`, | |
| ].filter(classname => !!classname).join(' ').trim(); | |
| return ( | |
| <button class={classes} onClick={this.handleClick}> | |
| <span class="label"><slot /></span> | |
| { showNbOfClicks && numberOfClicks > 0 && (<span class="nb-of-clicks">{ numberOfClicks }</span>) } | |
| </button> | |
| ) | |
| } | |
| } |
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