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26 lines
1.2 KiB
26 lines
1.2 KiB
import {reportError} from 'app/client/models/errors';
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import {DomContents, onDisposeElem, replaceContent} from 'grainjs';
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// grainjs annoyingly doesn't export browserGlobals tools, useful for testing in a simulated environment.
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import {G} from 'grainjs/dist/cjs/lib/browserGlobals';
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/**
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* Insert DOM contents produced by a Promise. Until the Promise is fulfilled, nothing shows up.
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* TODO: This would be a handy place to support options to show a loading spinner (perhaps
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* showing up if the promise takes more than a bit to show).
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*/
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export function domAsync(promiseForDomContents: Promise<DomContents>, onError = reportError): DomContents {
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const markerPre = G.document.createComment('a');
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const markerPost = G.document.createComment('b');
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// Function is added after the markers, to run once they have been attached to elem (the parent).
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return [markerPre, markerPost, (elem: Node) => {
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let disposed = false;
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promiseForDomContents
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.then((contents) => disposed || replaceContent(markerPre, markerPost, contents))
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.catch(onError);
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// If markerPost is disposed before the promise resolves, set insertContent to noop.
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onDisposeElem(markerPost, () => { disposed = true; });
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}];
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}
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