36 lines
1017 B
TypeScript
36 lines
1017 B
TypeScript
/**
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* Try to extract the list of themes from a theme selector on the page. This
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* will return undefined when no theme selector is available. The returned array
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* will be tuples where the first item is the theme value from the `<option>`
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* element and the second item being the theme display name.
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*/
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export function extractThemes(): Array<[string, string]> | undefined {
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const themes = document.querySelectorAll<HTMLOptionElement>(
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"select#theme option",
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);
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if (themes.length === 0) {
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return;
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}
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return Array.from(themes).map((theme) => [
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theme.value,
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(theme.textContent ?? "<unknown>").trim(),
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]);
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}
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/**
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* Set the theme class on the `<body>` element and remove any other existing
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* theme classes.
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*/
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export function setBodyThemeClass(theme: string): void {
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for (const value of Array.from(document.body.classList)) {
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if (!value.startsWith("theme-")) {
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continue;
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}
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document.body.classList.remove(value);
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}
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document.body.classList.add(`theme-${theme}`);
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}
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