80 lines
2.0 KiB
JavaScript
80 lines
2.0 KiB
JavaScript
let timeout;
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const loadingQueue = [];
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const localCache = {};
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const failedCache = {};
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function loadNext(ajax) {
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if (loadingQueue.length === 0) {
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timeout = null;
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return;
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}
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let timeoutMs = 150;
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let removeLoading = true;
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const { url, refresh, $elem, userId } = loadingQueue.shift();
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// Retrieve the onebox
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return ajax("/onebox", {
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dataType: 'html',
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data: { url, refresh, user_id: userId },
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cache: true
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}).then(html => {
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localCache[url] = html;
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$elem.replaceWith(html);
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}, result => {
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if (result && result.jqXHR && result.jqXHR.status === 429) {
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timeoutMs = 2000;
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removeLoading = false;
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loadingQueue.unshift({ url, refresh, $elem, userId });
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} else {
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failedCache[url] = true;
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}
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}).finally(() => {
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timeout = Ember.run.later(() => loadNext(ajax), timeoutMs);
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if (removeLoading) {
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$elem.removeClass('loading-onebox');
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$elem.data('onebox-loaded');
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}
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});
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}
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// Perform a lookup of a onebox based an anchor $element.
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// It will insert a loading indicator and remove it when the loading is complete or fails.
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export function load(e, refresh, ajax, userId, synchronous) {
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const $elem = $(e);
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// If the onebox has loaded or is loading, return
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if ($elem.data('onebox-loaded')) return;
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if ($elem.hasClass('loading-onebox')) return;
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const url = e.href;
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// Unless we're forcing a refresh...
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if (!refresh) {
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// If we have it in our cache, return it.
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const cached = localCache[url];
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if (cached) return cached;
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// If the request failed, don't do anything
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const failed = failedCache[url];
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if (failed) return;
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}
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// Add the loading CSS class
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$elem.addClass('loading-onebox');
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// Add to the loading queue
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loadingQueue.push({ url, refresh, $elem, userId });
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// Load next url in queue
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if (synchronous) {
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return loadNext(ajax);
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} else {
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timeout = timeout || Ember.run.later(() => loadNext(ajax), 150);
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}
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}
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export function lookupCache(url) {
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return localCache[url];
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}
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