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Ticket #2921: cleanup on LinkPreview to make fewer requests while typing. Will now wait for each link's preview request to complete (successfully or unsuccessfully) before re-running it)

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This commit is contained in:
Brion Vibber
2010-12-06 14:49:24 -08:00
parent fb1fc8a046
commit bb50e773e6
1 changed files with 74 additions and 21 deletions
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95
plugins/LinkPreview/linkpreview.js
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@@ -3,6 +3,9 @@
*/
(function() {
/**
* Quickie wrapper around ooembed JSON lookup
*/
var oEmbed = {
api: 'http://oohembed.com/oohembed',
width: 100,
@@ -57,14 +60,24 @@
maxheight: oEmbed.height,
token: $('#token').val()
};
$.get(oEmbed.api, params, function(data, xhr) {
callback(data);
}, 'json');
$.ajax({
url: oEmbed.api,
data: params,
dataType: 'json',
success: function(data, xhr) {
callback(data);
},
error: function(xhr, textStatus, errorThrown) {
callback(null);
}
});
}
};
var LinkPreview = {
links: [],
state: [],
refresh: [],
/**
* Find URL links from the source text that may be interesting.
@@ -88,22 +101,26 @@
* Start looking up info for a link preview...
* May start async data loads.
*
* @param {String} id
* @param {String} url
* @param {number} col: column number to insert preview into
*/
prepLinkPreview: function(id, url)
prepLinkPreview: function(col)
{
var id = 'link-preview-' + col;
var url = LinkPreview.links[col];
LinkPreview.refresh[col] = false;
LinkPreview.markLoading(col);
oEmbed.lookup(url, function(data) {
var thumb = null;
var width = 100;
if (typeof data.thumbnail_url == "string") {
if (data && typeof data.thumbnail_url == "string") {
thumb = data.thumbnail_url;
if (typeof data.thumbnail_width !== "undefined") {
if (data.thumbnail_width < width) {
width = data.thumbnail_width;
}
}
} else if (data.type == 'photo' && typeof data.url == "string") {
} else if (data && data.type == 'photo' && typeof data.url == "string") {
thumb = data.url;
if (typeof data.width !== "undefined") {
if (data.width < width) {
@@ -111,6 +128,7 @@
}
}
}
if (thumb) {
var link = $('<span class="inline-attachment"><a><img/></a></span>');
link.find('a')
@@ -121,7 +139,19 @@
.attr('src', thumb)
.attr('width', width)
.attr('title', data.title || data.url || url);
$('#' + id).empty();
$('#' + id).append(link);
} else {
// No thumbnail available or error retriving it.
LinkPreview.clearLink(col);
}
if (LinkPreview.refresh[col]) {
// Darn user has typed more characters.
// Go fetch another link!
LinkPreview.prepLinkPreview(col);
} else {
LinkPreview.markDone(col);
}
});
},
@@ -134,34 +164,57 @@
*/
previewLinks: function(text)
{
var i;
var old = LinkPreview.links;
var links = LinkPreview.findLinks(text);
LinkPreview.links = links;
// Check for existing common elements...
for (var i = 0; i < old.length && i < links.length; i++) {
for (i = 0; i < old.length && i < links.length; i++) {
if (links[i] != old[i]) {
// Change an existing entry!
var id = 'link-preview-' + i;
$('#' + id).html('');
LinkPreview.prepLinkPreview(id, links[i]);
if (LinkPreview.state[i] == "loading") {
// Slate this column for a refresh when this one's done.
LinkPreview.refresh[i] = true;
} else {
// Change an existing entry!
LinkPreview.prepLinkPreview(i);
}
}
}
if (links.length > old.length) {
// Adding new entries, whee!
for (var i = old.length; i < links.length; i++) {
var id = 'link-preview-' + i;
$('#link-preview').append('<span id="' + id + '"></span>');
LinkPreview.prepLinkPreview(id, links[i]);
for (i = old.length; i < links.length; i++) {
LinkPreview.addPreviewArea(i);
LinkPreview.prepLinkPreview(i);
}
} else if (old.length > links.length) {
// Remove preview entries for links that have been removed.
for (var i = links.length; i < old.length; i++) {
var id = 'link-preview-' + i;
$('#' + id).remove();
for (i = links.length; i < old.length; i++) {
LinkPreview.clearLink(i);
}
}
},
LinkPreview.links = links;
addPreviewArea: function(col) {
var id = 'link-preview-' + col;
$('#link-preview').append('<span id="' + id + '"></span>');
},
clearLink: function(col) {
var id = 'link-preview-' + col;
$('#' + id).html('');
},
markLoading: function(col) {
LinkPreview.state[col] = "loading";
var id = 'link-preview-' + col;
$('#' + id).attr('style', 'opacity: 0.5');
},
markDone: function(col) {
LinkPreview.state[col] = "done";
var id = 'link-preview-' + col;
$('#' + id).removeAttr('style');
},
/**