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RoyalIcingRoyalIcing
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Add custom elements cheatsheet
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-95
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2 files changed

+112
-95
lines changed

‎lib/components_guide_web/templates/cheatsheets/astro.html.md‎

Lines changed: 7 additions & 95 deletions
Original file line numberDiff line numberDiff line change
@@ -8,98 +8,10 @@ class = "italic"
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<p class={class}><%= a %>?</p>
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<p class={class}><%= class %></p>
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<script>
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window.customElements.define('custom-element', class extends HTMLElement {
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connectedCallback() {
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console.log('connectedCallback called');
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const name = this.getAttribute('name');
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const source = this;
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// Attempt to wait until the inner template has been added as a child node.
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const observer = new MutationObserver((mutationList, observer) => {
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outer: for (const mutation of mutationList) {
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for (const node of mutation.addedNodes.values()) {
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if (node instanceof HTMLTemplateElement) {
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doDefine();
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observer.disconnect();
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break outer;
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}
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}
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}
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});
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observer.observe(this, { childList: true });
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// class NewElement extends HTMLElement {
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// }
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function doDefine() {
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window.customElements.define(name, class extends HTMLElement {
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ensureTemplate() {
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if (this.hasAddedTemplate) return;
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const template = source.querySelector('template');
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const fragment = template.content.cloneNode(true);
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this.attachShadow({mode: 'open'}).appendChild(fragment);
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// this.append(fragment);
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this.hasAddedTemplate = true;
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}
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connectedCallback() {
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this.ensureTemplate();
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}
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static get observedAttributes() {
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const template = source.querySelector('template');
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const slots = template.content.querySelectorAll('slot');
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const slotNames = Array.from(slots, slot => slot.name);
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return slotNames;
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}
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attributeChangedCallback(name, oldValue, newValue) {
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this.ensureTemplate();
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for (const node of this.querySelectorAll(`slot[name="${name}"]`).values()) {
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node.remove();
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}
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this.append(Object.assign(this.ownerDocument.createElement('span'), { textContent: newValue, slot: name }));
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}
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});
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}
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}
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});
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</script>
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<script>
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window.customElements.define('custom-element3', class extends HTMLElement {
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connectedCallback() {
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const name = this.getAttribute('name');
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const source = this;
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console.log(this.innerHTML);
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window.customElements.define(name, class extends HTMLElement {
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connectedCallback() {
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const template = source.querySelector('template');
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const fragment = template.content.cloneNode(true);
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this.attachShadow({mode: 'open'}).appendChild(fragment);
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}
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});
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}
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});
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</script>
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<custom-element name="hello-there">
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<template>Hello <slot name="subject">World</slot>.</template>
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</custom-element>
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<hello-there></hello-there>
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<hello-there><span slot="subject">Universe</span></hello-there>
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<hello-there subject="Props"></hello-there>
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<custom-element name="custom-script">
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<template>
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<script>console.log("Inside template", document.currentScript)</script>
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</template>
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</custom-element>
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<custom-script></custom-script>
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```astro
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---
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title: When WebAssembly is faster
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description: The overhead of the network vs the overhead of WebAssembly
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layout: ../../layouts/MainLayout.astro
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---
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```

‎lib/components_guide_web/templates/cheatsheets/custom-elements.md‎

Lines changed: 105 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,105 @@
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---
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a = 4 + 3
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class = "italic"
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---
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# Custom Elements
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<p class={class}><%= a %>?</p>
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<p class={class}><%= class %></p>
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<script>
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window.customElements.define('custom-element', class extends HTMLElement {
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connectedCallback() {
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console.log('connectedCallback called');
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const name = this.getAttribute('name');
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const source = this;
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// Attempt to wait until the inner template has been added as a child node.
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const observer = new MutationObserver((mutationList, observer) => {
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outer: for (const mutation of mutationList) {
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for (const node of mutation.addedNodes.values()) {
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if (node instanceof HTMLTemplateElement) {
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doDefine();
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observer.disconnect();
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break outer;
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}
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}
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}
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});
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observer.observe(this, { childList: true });
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// class NewElement extends HTMLElement {
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// }
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function doDefine() {
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window.customElements.define(name, class extends HTMLElement {
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ensureTemplate() {
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if (this.hasAddedTemplate) return;
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const template = source.querySelector('template');
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const fragment = template.content.cloneNode(true);
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this.attachShadow({mode: 'open'}).appendChild(fragment);
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// this.append(fragment);
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this.hasAddedTemplate = true;
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}
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connectedCallback() {
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this.ensureTemplate();
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}
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static get observedAttributes() {
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const template = source.querySelector('template');
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const slots = template.content.querySelectorAll('slot');
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const slotNames = Array.from(slots, slot => slot.name);
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return slotNames;
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}
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attributeChangedCallback(name, oldValue, newValue) {
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this.ensureTemplate();
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for (const node of this.querySelectorAll(`slot[name="${name}"]`).values()) {
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node.remove();
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}
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this.append(Object.assign(this.ownerDocument.createElement('span'), { textContent: newValue, slot: name }));
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}
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});
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}
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}
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});
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</script>
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<script>
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window.customElements.define('custom-element3', class extends HTMLElement {
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connectedCallback() {
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const name = this.getAttribute('name');
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const source = this;
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console.log(this.innerHTML);
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window.customElements.define(name, class extends HTMLElement {
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connectedCallback() {
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const template = source.querySelector('template');
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const fragment = template.content.cloneNode(true);
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this.attachShadow({mode: 'open'}).appendChild(fragment);
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}
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});
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}
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});
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</script>
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<custom-element name="hello-there">
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<template>Hello <slot name="subject">World</slot>.</template>
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</custom-element>
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<hello-there></hello-there>
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<hello-there><span slot="subject">Universe</span></hello-there>
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<hello-there subject="Props"></hello-there>
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<custom-element name="custom-script">
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<template>
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<script>console.log("Inside template", document.currentScript)</script>
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</template>
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</custom-element>
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<custom-script></custom-script>

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