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LinkPreview: piggyback on the counter update logic, cache lookups.

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This commit is contained in:
Brion Vibber 2010-11-16 14:16:23 -08:00
parent f103a55052
commit eeb7f02b98
1 changed files with 71 additions and 32 deletions
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61
plugins/LinkPreview/linkpreview.js
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@ -21,6 +21,40 @@ $(function() {
return links;
}
var oEmbed = {
api: 'http://oohembed.com/oohembed',
cache: {},
callbacks: {},
/**
* Do a cached oEmbed lookup for the given URL.
*
* @param {String} url
* @param {function} callback
*/
lookup: function(url, callback)
{
if (typeof oEmbed.cache[url] == "object") {
// We already have a successful lookup.
callback(oEmbed.cache[url]);
} else if (typeof oEmbed.callbacks[url] == "undefined") {
// No lookup yet... Start it!
oEmbed.callbacks[url] = [callback];
oEmbed.rawLookup(url, function(data) {
oEmbed.cache[url] = data;
var callbacks = oEmbed.callbacks[url];
oEmbed.callbacks[url] = undefined;
for (var i = 0; i < callbacks.length; i++) {
callbacks[i](data);
}
});
} else {
// A lookup is in progress.
oEmbed.callbacks[url].push(callback);
}
},
/**
* Do an oEmbed lookup for the given URL.
*
@ -30,9 +64,8 @@ $(function() {
* @param {String} url
* @param {function} callback
*/
function oEmbedLookup(url, callback)
rawLookup: function(url, callback)
{
var api = 'http://oohembed.com/oohembed';
var params = {
url: url,
format: 'json',
@ -40,10 +73,11 @@ $(function() {
maxheight: 75,
callback: '?'
};
$.get(api, params, function(data, xhr) {
$.get(oEmbed.api, params, function(data, xhr) {
callback(data);
}, 'jsonp');
}
};
/**
* Start looking up info for a link preview...
@ -54,7 +88,7 @@ $(function() {
*/
function prepLinkPreview(id, url)
{
oEmbedLookup(url, function(data) {
oEmbed.lookup(url, function(data) {
var thumb = null;
var width = 100;
if (typeof data.thumbnail_url == "string") {
@ -73,9 +107,11 @@ $(function() {
}
}
if (thumb) {
var link = $('<a><img/></a>');
link.attr('href', url)
var link = $('<span class="inline-attachment"><a><img/></a></span>');
link.find('a')
.attr('href', url)
.attr('target', '_blank')
.last()
.find('img')
.attr('src', thumb)
.attr('width', width)
@ -101,9 +137,12 @@ $(function() {
prepLinkPreview(id, links[i]);
}
}
$('#form_notice').append('<div id="link-preview"></div>');
$('#notice_data-text').change(function() {
var text = $(this).val();
previewLinks(text);
});
$('#form_notice').append('<div id="link-preview" class="thumbnails"></div>');
// Piggyback on the counter update...
var origCounter = SN.U.Counter;
SN.U.Counter = function(form) {
previewLinks($('#notice_data-text').val());
return origCounter(form);
}
});