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// pichat.js
var Nick = null;
function handleMsgError(resp) {
var respText = resp.responseText ? resp.responseText.trim() : false;
if (respText == 'UNKNOWN_USER') {
alert("Can't send message! Please login.");
} else if (respText) {
alert("Cannot send message! (" + respText + ")");
} else {
alert("Cannot send message!");
}
}
function escapeHtml(txt) {
if (!txt) {
return ""
} else {
return $("<span>").text(txt).html();
}
}
function buildUserDiv(user) {
return '<div>' + escapeHtml(user) + '</div>';
}
// http://stackoverflow.com/questions/37684/replace-url-with-html-links-javascript
function linkify(text) {
var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/gi;
return text.replace(exp,"<a href='$1'>$1</a>");
}
// http://snippets.dzone.com/posts/show/6995
var URLRegex = /((http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/i;
var PicRegex = /\.(jpg|jpeg|png|gif|bmp)$/i;
function buildMessageDiv(msg) {
function buildContent(content) {
var match = URLRegex.exec(content)
if (match && PicRegex.test(match[0])) {
return '<a href="' + match[0] + '" target="_blank">'
+ '<img src="'+ match[0] + '" /></a>';
} else {
return linkify(escapeHtml(msg.content));
}
}
return '<div class="msgDiv"><b>' + escapeHtml(msg.nick) + ': </b>'
+ buildContent(msg.content) + '</div>';
}
function submitMessage() {
var content = $('#msgInput').val();
var msg = { 'nick': Nick, 'content': content, 'timestamp': new Date() };
if (content == '') { return; }
var shouldScroll = isScrolledToBottom($('#messageList')[0]);
$('#messageList').append($(buildMessageDiv(msg)));
$('#msgInput').val('');
if (shouldScroll) {
scrollToBottom($('#messageList')[0]);
}
var onSuccess = function() {};
var onError = function(resp, textStatus, errorThrown) {
handleMsgError(resp);
};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'msg',
data: {'content': content },
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
}
function ifEnter(fn) {
return function(e) {
if (e.keyCode == 13) { fn(); }
};
}
function isScrolledToBottom(div) {
return Math.abs(div.scrollTop - (div.scrollHeight - div.offsetHeight)) <= 3;
}
function scrollToBottom(div) {
div.scrollTop = div.scrollHeight;
}
function refresh() {
var onSuccess = function(json) {
if (json.messages.length > 0) {
var shouldScroll = isScrolledToBottom($('#messageList')[0]);
// Ignore our own messages
var filterFunc = function(m) { return m.nick != Nick };
var msgStr = $.map($.grep(json.messages, filterFunc),
buildMessageDiv).join('');
$('#messageList').append(msgStr);
if (shouldScroll) {
scrollToBottom($('#messageList')[0]);
}
}
$("#userList").html($.map(json.users, buildUserDiv).join(''));
};
var onError = function(resp, textStatus, errorThrown) {};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'refresh',
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
}
function init() {
var onSuccess = function(json) {
$('#loadingbox').hide();
Nick = json.nick;
$('#nickspan').text(Nick);
$('#welcomebar').show();
var msgStr = $.map(json.messages, buildMessageDiv).join('');
$('#messageList').append(msgStr);
$("#userList").html($.map(json.users, buildUserDiv).join(''));
$('#nickInput, #nickSubmit, #msgInput, #msgSubmit').removeAttr('disabled');
// Delay scrolling by .5 seconds so images can start loading.
setTimeout(scrollToBottom, 500, $('#messageList')[0]);
setInterval(refresh, 1000);
};
var onError = function(resp, textStatus, errorThrown) {
alert("Error connecting to chat server!");
};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'init',
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
$('#msgInput').keyup(ifEnter(submitMessage));
$('#msgSubmit').click(submitMessage);
}
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