StackOverflow2013

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14376639
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2013-01-17T10:10:12.143
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2013-01-17T10:10:12.143
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text
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<p>Your problem is that youdelete everything from usernames and after that you write all contacts. You would better remove the offline contacts from the $('#usernames') and after that to add to that list the online contacts. I writed some functions to show you the functionality. I created html list of online contacts and I also created an array of new online contacts. Here is the code: </p> <pre><code><div id="u"> <div class="d" onclick="chat('asd1')">asd1</div> <div class="d" onclick="chat('asd12')">asd12</div> <div class="d" onclick="chat('asd13')">asd13</div> <div class="d" onclick="chat('asd142')">asd14</div> </div> </code></pre> <p>Here you have the javascript that you need to run after the DOM is ready:</p> <pre><code>var onlineUsernames = ["asd211","asd12","asd13","asd14"]; var usernamesContainerID = 'u'; var $usernamesContainer = $('#'+usernamesContainerID); function extractUsernameFromAttr(onclickValue) { return onclickValue.split("'")[1]; } function buildExistingUsernames($userDivs) { var existingUsernames = []; $userDivs.each(function(index,value){ var username = extractUsernameFromAttr($userDivs[index].getAttribute('onclick')); existingUsernames.push(username); }) return existingUsernames; } function removeUserFromList($user) { document.getElementById(usernamesContainerID).removeChild($user); } function addUserToList(value) { $('<div/>',{ onclick:"chat('"+value+"')", class :'d', text:value }).appendTo($usernamesContainer); } function deleteOfflineContacts(existingUsernames,usernames,$userDivs) { $.each(existingUsernames,function(index,value) { if($.inArray(value,usernames)==-1) { removeUserFromList($userDivs[index]); } }) } function addOnlineContacts(existingUsernames,usernames) { $.each(usernames,function(index,value) { if($.inArray(value,existingUsernames)==-1) { addUserToList(value); } }) } function update($userDivs) { var existingUsernames = buildExistingUsernames($userDivs); deleteOfflineContacts(existingUsernames,onlineUsernames,$userDivs); addOnlineContacts(existingUsernames,onlineUsernames); } var $userDivs = $usernamesContainer.children("div"); setTimeout(function() { update($userDivs); },3000); </code></pre> <p>If you need it here is a working example: <a href="http://jsfiddle.net/9gRyQ/2/" rel="nofollow">http://jsfiddle.net/9gRyQ/2/</a></p>
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1. USEmil Condrea
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