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POJavascript function called twice, how to handle this?
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  1. POJavascript function called twice, how to handle this?
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    copied!<p>My application is a LiveChat developed in C# and ASP.NET</p> <p>I have a Client timer which call the webservice Function RetrieveMessages() every second. Additionally, soon after the user send a message i'm call de same function RetrieveMessages().</p> <p>I have a variable that store the last message Id, so, every RetrieveMessage call retrieve only the messages that is unread.</p> <p>Sometimes the the client show the same message twice, like so:</p> <p>Ewerton (14:22:20) : Hello! Ewerton (14:22:20) : Hello!</p> <p>the duplicity occurs only in client, the DataBase table is ok, no duplications.</p> <p>I suspect tha the Timer, and the Send Message is executing a RetrieveMessage before the variable lastMessageId is updated.</p> <p>How can i synchronize the call of the RetrieveMessage() ?</p> <p>Here are some code to analise.</p> <pre><code> // ThisFunction is a callback that RetrieveMessage every time the user send's a message function SendMessageSucess(cdMsgEnviada) { //Carrega Mensagens Avalon.Services.ChatService.RetrieveMessages(CodChamado, IdLastMsg, RetrieveMessagesSucess); } </code></pre> <p>OnTImer Tick</p> <pre><code> // Every second, verify is exist new messages function timer_onTick() { //Carrega Mensagens Avalon.Services.ChatService.RetrieveMessages(CodChamado, IdLastMsg, RetrieveMessagesSucess); } </code></pre> <p>The RetrieveMessages function</p> <pre><code>function RetrieveMessagesSucess(result) { var myMsgs = new Array(); for (var i = 0; i &lt; result.length; i++) { var obj = eval('(' + result[i] + ')'); if (obj != null) myMsgs[i] = obj; } for (var j = 0; j &lt; myMsgs.length; j++) { if (myMsgs.length &gt; 0) { // Armazeno o codigo da ultima mensagem recebida IdLastMsg = myMsgs[myMsgs.length - 1].cd_chat_message; if (par) { var novoconteudo = "&lt;div style='background-color: #EFEFEF; padding: 10px;'&gt;" par = false; } else { var novoconteudo = "&lt;div style='padding: 10px;'&gt;" par = true; } if (myMsgs[j].origem_mensagem == 1) // Msg enviada pelo cliente novoconteudo = novoconteudo + "&lt;b&gt;" + myMsgs[j].solicitante + ": &lt;/b&gt;" else novoconteudo = novoconteudo + "&lt;b&gt;" + myMsgs[j].tecnico + ": &lt;/b&gt;" var objDate = eval(myMsgs[j].datahora.replace(/\/Date\((\d+)\)\//gi, "new Date($1)")); novoconteudo = novoconteudo + "(" + objDate.format("HH:MM:ss") + ") "; novoconteudo = novoconteudo + myMsgs[j].texto + "&lt;/div&gt;"; divChatHistory.append(novoconteudo); AutoScroll(); if (myMsgs[j].origem_mensagem == 2) // Msg enviada por um tecnico show_popAlert() } } // Verifico se o chat esta ativo IsChatInativo(); } </code></pre> <p>Any Ideas ?</p>
 

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