42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
/**
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* Retrieve content from remote JSON source
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* Displays textContent while loading, then replaces with JSON response
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* @property {string} src - URI to remote JSON
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* @property {string} prop - Property of JSON to display
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* @property {string} placeholder - Interim content to display while retrieving and reading JSON
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*/
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// TODO: Add callback prop
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// TODO: Allow accessing local objects
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// TODO: Implement attributeChangedCallback and re-fetch
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class DjlJson extends HTMLElement {
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src; // string
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prop; // string
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placeholder; // string
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constructor() {
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super();
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this.src = this.getAttribute('src')
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this.prop = this.getAttribute('prop').split('.')
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this.placeholder = this.textContent
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fetch(this.src)
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.then(resp => {
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if (!resp.ok)
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throw new Error(`Unabled to retrieve resouce ${this.src} (${resp.statusText})`)
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return resp.json()
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})
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.then(json => this.getProp(json, this.prop))
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.then(prop => this.textContent = prop)
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.catch(err => { console.error(err); this.textContent = err })
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}
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getProp(obj, prop) {
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if (!prop.length) return obj
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return this.getProp(obj[prop[0]], prop.slice(1))
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}
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}
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customElements.define('djl-json', DjlJson)
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