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September 16, 2016 03:06
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<card-swiper> custom element - demonstrates the usage of the v1 polyfills.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0"> | |
| <title>How to use the Custom Elements v1 + Shadow DOM v1 polyfills</title> | |
| <style> | |
| body { | |
| font-family: sans-serif; | |
| font-weight: 300; | |
| } | |
| card-swiper { | |
| --card-size: 100px; | |
| width: 400px; | |
| border: 1px solid black; | |
| } | |
| .card { | |
| border-radius: 3px; | |
| background: #eee; | |
| } | |
| #paginator { | |
| margin-top: 16px; | |
| } | |
| #paginator a { | |
| text-decoration: none; | |
| background: #000; | |
| padding: 6px 12px; | |
| color: #fff; | |
| display: inline-block; | |
| border-radius: 3px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <card-swiper> | |
| <div id="card1" class="card">card 1</div> | |
| <div id="card2" class="card">card 2</div> | |
| <div id="card3" class="card">card 3</div> | |
| <div id="card4" class="card">card 4</div> | |
| <div id="card5" class="card">card 5</div> | |
| <div id="card6" class="card">card 6</div> | |
| <div id="card7" class="card">card 7</div> | |
| <div id="card8" class="card">card 8</div> | |
| <div id="card9" class="card">card 9</div> | |
| <div id="card10" class="card">card 10</div> | |
| </card-swiper> | |
| <div id="paginator"> | |
| <a href="#card1">1</a> | |
| <a href="#card2">2</a> | |
| <a href="#card3">3</a> | |
| <a href="#card4">4</a> | |
| <a href="#card5">5</a> | |
| <a href="#card6">6</a> | |
| <a href="#card7">7</a> | |
| <a href="#card8">8</a> | |
| <a href="#card9">9</a> | |
| <a href="#card10">10</a> | |
| </div> | |
| <template id="card-swiper-template"> | |
| <style> | |
| :host { | |
| display: block; | |
| --card-size_: var(--card-size, 100px); | |
| } | |
| :host([noshadow]) .slot-container ::slotted(*) { | |
| box-shadow: none; | |
| } | |
| .slot-container { | |
| display: flex; | |
| overflow-x: auto; | |
| scroll-snap-type: mandatory; | |
| /* scroll-snap-points-x: repeat(calc(var(--card-size) + var(--card-padding))); */ | |
| scroll-behavior: smooth; /* smooths scroll when the numbers are clicked. */ | |
| padding: 6px; | |
| } | |
| .slot-container ::slotted(*) { | |
| width: var(--card-size_); | |
| height: var(--card-size_); | |
| padding: var(--card-padding, 16px); | |
| margin-right: var(--card-margin, 16px); | |
| flex-shrink: 0; | |
| box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), | |
| 0 1px 5px 0 rgba(0, 0, 0, 0.12), | |
| 0 3px 1px -2px rgba(0, 0, 0, 0.2); | |
| scroll-snap-coordinate: 0% 50%; | |
| } | |
| .slot-container ::slotted(:last-child) { | |
| margin-right: 0; | |
| } | |
| @media (min-width: 700px) { | |
| .slot-container { | |
| flex-wrap: wrap; | |
| } | |
| .slot-container ::slotted(*) { | |
| margin-bottom: 16px; | |
| } | |
| } | |
| </style> | |
| <div class="slot-container"> | |
| <slot></slot> | |
| </div> | |
| </template> | |
| <script src="https://rawgit.com/webcomponents/custom-elements/master/custom-elements.min.js"></script> | |
| <script src="https://rawgit.com/webcomponents/shadydom/master/shadydom.min.js"></script> | |
| <script src="https://rawgit.com/webcomponents/shadycss/master/shadycss.min.js"></script> | |
| <script> | |
| (function() { | |
| 'use strict'; | |
| const supportsCustomElementsV1 = 'customElements' in window; | |
| const supportsShadowDOMV1 = !!HTMLElement.prototype.attachShadow; | |
| // function loadScript(src) { | |
| // return new Promise(function(resolve, reject) { | |
| // const script = document.createElement('script'); | |
| // script.async = true; | |
| // script.src = src; | |
| // script.onload = resolve; | |
| // script.onerror = reject; | |
| // document.head.appendChild(script); | |
| // }); | |
| // } | |
| // function lazyLoadWCPolyfillsIfNecessary() { | |
| // const loadPromises = []; | |
| // if (!supportsCustomElementsV1) { | |
| // loadPromises.push( | |
| // loadScript('https://rawgit.com/webcomponents/custom-elements/master/custom-elements.min.js')); | |
| // } | |
| // if (!supportsShadowDOMV1) { | |
| // loadPromises.push( | |
| // loadScript('https://rawgit.com/webcomponents/shadydom/master/shadydom.min.js')); | |
| // loadPromises.push( | |
| // loadScript('https://rawgit.com/webcomponents/shadycss/master/shadycss.min.js')); | |
| // } | |
| // return Promise.all(loadPromises); | |
| // } | |
| class CardSwiper extends HTMLElement { | |
| static get is() { return 'card-swiper'; } | |
| static get templateId() { return `${this.is}-template`; } | |
| static get template() { | |
| if (!this._template) { | |
| this._template = document.querySelector(`#${this.templateId}`); | |
| } | |
| return this._template; | |
| } | |
| constructor() { | |
| super(); | |
| if (!CardSwiper.template) { | |
| throw Error(`Could not find element <template id="${CardSwiper.templateId}">`); | |
| } | |
| } | |
| connectedCallback() { | |
| const shadowRoot = this.attachShadow({mode: 'open'}); | |
| shadowRoot.appendChild( | |
| document.importNode(CardSwiper.template.content, true)); | |
| // Shim styles, CSS custom props, etc. if native Shadow DOM isn't available. | |
| if (!supportsShadowDOMV1) { | |
| ShadyCSS.applyStyle(this); | |
| } | |
| } | |
| } | |
| // TODO: use this and remove the polyfills when https://github.com/webcomponents/shadycss/issues/7 is fixed. | |
| // lazyLoadWCPolyfillsIfNecessary().then(function(events) { | |
| // if (!supportsShadowDOMV1) { | |
| // ShadyCSS.prepareTemplate(CardSwiper.template, CardSwiper.is); | |
| // } | |
| // window.customElements.define(CardSwiper.is, CardSwiper); | |
| // }); | |
| // Shim the element's style. This is a noop in browsers that support | |
| // Shadow DOM and CSS custom properties. | |
| ShadyCSS.prepareTemplate(CardSwiper.template, CardSwiper.is); | |
| window.customElements.define(CardSwiper.is, CardSwiper); | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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