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// pichat.js
var Nick = null;
function handleJoinError(resp) {
var respText = resp.responseText ? resp.responseText.trim() : false;
if (respText == 'NICK_TAKEN') {
alert("Nick '" + Nick + "' was taken! Please choose another.");
} else if (respText) {
alert("Cannot join! (" + respText + ")");
} else {
alert("Cannot join! Please try again later.");
}
}
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 join() {
$('#join, #nick').attr('disabled', true);
$('#loginspinner').show();
Nick = $('#nick').val();
onSuccess = function(json) {
generateChatInterface(json.users, json.messages);
};
onError = function(resp, textStatus, errorThrown) {
$('#join, #nick').attr('disabled', false);
$('#loginspinner').hide();
handleJoinError(resp);
};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'join',
data: {'nick': Nick },
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
}
function buildUserDiv(user) {
return '<div>' + user + '</div>';
}
// http://snippets.dzone.com/posts/show/6995
var URLRegex = /((http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/i;
function buildMessageDiv(msg) {
var match = URLRegex.exec(msg.content)
if (match) {
return '<div class="msgDev"><b>' + msg.nick + ': </b>'
+ '<img height="150" width="150" src="' + match[0] + '" /></div>';
} else {
return '<div class="msgDiv"><b>' + msg.nick + ": </b>"
+ msg.content + "</div>";
}
}
function buildChatInterface(users, messages) {
var userList = '<div id="userlist">'
+ $.map(users, buildUserDiv).join('') + '</div>';
var messageList = '<div id="messagePane">'
+ '<div id="messageList">'
+ $.map(messages, buildMessageDiv).join('')
+ '</div>'
+ '<div id="msgInputDiv">'
+ '<input type="input" id="msgInput">'
+ '<input type="submit" value="Enter" id="msgSubmit">'
+ '</div>'
+ '</div>';
return '<h1>Pichat</h1><div id="chatbox">' + userList + messageList + '</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);
};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'msg',
data: {'content': content },
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
}
function ifEnter(fn) {
return function(e) {
if (e.keyCode == 13) { fn(); }
};
}
function isScrolledToBottom(div) {
return Math.abs(div.scrollTop - (div.scrollHeight - div.offsetHeight)) <= 3;
}
function scrollToBottom(div) {
div.scrollTop = div.scrollHeight;
}
function refresh() {
var onSuccess = function(json) {
if (json.messages.length == 0) {
return;
}
var shouldScroll = isScrolledToBottom($('#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]);
}
};
var onError = function(resp, textStatus, errorThrown) {};
$.ajax({
type: 'GET',
timeout: 5000,
url: 'refresh',
cache: false,
dataType: 'json',
success: onSuccess,
error: onError
});
}
function generateChatInterface(users, messages) {
$('#content').html(buildChatInterface(users, messages));
$('#msgInput').keyup(ifEnter(submitMessage));
$('#msgSubmit').click(submitMessage);
setInterval(refresh, 1000);
}
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