ed6e2b1d79
http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony - Thanks @riking for finding it.
60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
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// A local cache lookup
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var localCache = [];
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/**
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Lookup a username and return whether it is exists or not.
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@function lookup
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@param {String} username to look up
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@return {Promise} promise that results to whether the name was found or not
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**/
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function lookup(username) {
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return new Em.RSVP.Promise(function (resolve) {
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var cached = localCache[username];
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// If we have a cached answer, return it
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if (typeof cached !== "undefined") {
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resolve(cached);
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} else {
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Discourse.ajax("/users/is_local_username", { data: { username: username } }).then(function(r) {
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localCache[username] = r.valid;
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resolve(r.valid);
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});
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}
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});
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}
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/**
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Help us link directly to a mentioned user's profile if the username exists.
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@class Mention
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@namespace Discourse
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@module Discourse
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**/
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Discourse.Mention = {
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/**
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Paints an element in the DOM with the appropriate classes and markup if the username
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it is mentioning exists.
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@method paint
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@param {Element} the element in the DOM to decorate
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**/
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paint: function(e) {
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var $elem = $(e);
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if ($elem.data('mention-tested')) return;
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var username = $elem.text().substr(1);
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$elem.addClass('mention-loading');
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lookup(username).then(function(found) {
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if (found) {
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$elem.replaceWith("<a href='" + Discourse.getURL("/users/") + username.toLowerCase() + "' class='mention'>@" + username + "</a>");
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} else {
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$elem.removeClass('mention-loading').addClass('mention-tested');
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}
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});
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}
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};
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