Is it possible to dynamically load a component's template at runtime in Svelte? I am interested in downloading a user-defined template and using it to construct the component on-the-fly. Can this functionality be achieved?
Is it possible to dynamically load a component's template at runtime in Svelte? I am interested in downloading a user-defined template and using it to construct the component on-the-fly. Can this functionality be achieved?
To compile the template, you will need to include the Svelte compiler and utilize it for compilation. Take a look at how the setup is done in the REPL's repository for reference.
The REPL process involves two main steps:
'svelte/internal'The first step is straightforward – you can achieve it like this:
import { compile } from 'svelte/compiler';
const { js, css } = compile(template, {
filename: 'Component.svelte',
format: 'esm',
});
console.log(js.code, css.code);
Bundling requires more work (refer to the bundler's code in its worker's code). However, you can make the internals available for import and run the code directly.
For testing purposes, you could use unpkg.com and insert the code into an iframe.srcdoc:
const code = `
${js.code.replace(
'svelte/internal',
'https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="097a7f6c657d6c493a273d302739">[email protected]</a>/internal/index.mjs',
)}
new Component({ target: document.body });
`;
srcdoc = `
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Svelte App</title>
<${''}style>${css.code}</${''}style>
</head>
<body>
<${''}script type="module">${code}</${''}script>
</body>
</html>
`;
(Using ${} to split tags due to Svelte parser limitations.)
An alternate approach is to directly embed the code into your document through a new module script, identifying the target element using a unique random ID.
A useful technique is dynamically importing the script from a Blob:
const componentSrc = URL.createObjectURL(
new Blob([code], { type: 'text/javascript' })
);
const { default: Component } = await import(componentSrc);
URL.revokeObjectURL(componentSrc);
new Component({ target: ... });
If utilizing the component outside a sandboxed environment, be cautious of the XSS vulnerability you may expose yourself to.
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