web: Add common.js
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import * as utils from "./utils";
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function camelize(string) {
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return string.replace(/[^a-z\d](.)/gi, (_, char) => char.toUpperCase());
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}
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function getBooleanElements() {
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const elements = {};
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for (const option of document.getElementsByClassName("option")) {
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const [checkbox] = option.getElementsByTagName("input");
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if (checkbox.type !== "checkbox") {
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continue;
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}
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const [label] = option.getElementsByTagName("label");
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const key = camelize(checkbox.id);
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elements[key] = { option, checkbox, label };
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}
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return elements;
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}
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export async function bindBooleanOptions(onChange) {
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const elements = getBooleanElements();
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// Bind initial values.
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const options = await utils.getOptions(Object.keys(elements));
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for (const [key, value] of Object.entries(options)) {
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elements[key].checkbox.checked = value;
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}
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for (const [key, { checkbox, label }] of Object.entries(elements)) {
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// TODO: click/change/input?
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checkbox.addEventListener("click", () => {
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const value = checkbox.checked;
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options[key] = value;
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utils.storage.sync.set({ [key]: value });
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});
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label.textContent = utils.i18n.getMessage(`settings_${checkbox.id}`);
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// Prevent transition on load.
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// Method from https://stackoverflow.com/questions/11131875.
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label.classList.add("notransition");
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label.offsetHeight; // Trigger a reflow, flushing the CSS changes.
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label.classList.remove("notransition");
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}
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// Listen for future changes.
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utils.storage.onChanged.addListener((changes, namespace) => {
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if (namespace !== "sync") {
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return;
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}
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for (const [key, option] of Object.entries(changes)) {
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if (!elements[key]) {
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continue;
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}
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elements[key].checkbox.checked = option.newValue;
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options[key] = option.newValue;
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}
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if (onChange) {
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onChange(options);
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}
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});
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if (onChange) {
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onChange(options);
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}
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}
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