Un setTimeout qui s'interrompt quand la page perd le focus
Bonjour,
j'ai un chat qui marche bien mais j'aimerais pour soulager le système qu'il ne tente pas de réactualiser le fil de discussion quand l'utilisateur est sur un autre onglet.
J'ai tenté ceci mais la commande en ligne 74 n'est jamais exécutée.
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| <script type="text/javascript">
// Initialiser le chat
var sendReq = getXmlHttpRequestObject();
var receiveReq = getXmlHttpRequestObject();
var mTimer;
$(document).ready(function() {
// Focus sur la page ?
document.onblur = window.onblur;
document.focus = window.focus;
//Set the focus to the Chat Message Box
document.getElementById('txt_message').focus();
//Start Recieving Messages.
getChatText();
});
//Gets the browser specific XmlHttpRequest Object
function getXmlHttpRequestObject() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if(window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
document.getElementById('p_status').innerHTML = 'Status: Cound not create XmlHttpRequest Object. Consider upgrading your browser.';
}
}
//Gets the current messages from the server
function getChatText() {
if (receiveReq.readyState == 4 || receiveReq.readyState == 0) {
receiveReq.open("GET", 'getChat.php?chat=1&last=' + lastMessage, true);
receiveReq.onreadystatechange = handleReceiveChat;
receiveReq.send(null);
}
}
//Add a message to the chat server.
function sendChatText() {
if(document.getElementById('txt_message').value == '') {
alert("You have not entered a message");
return;
}
if (sendReq.readyState == 4 || sendReq.readyState == 0) {
sendReq.open("POST", 'getChat.php?chat=1&last=' + lastMessage, true);
sendReq.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
sendReq.onreadystatechange = handleSendChat;
var param = 'message=' + document.getElementById('txt_message').value;
param += '&userID=<?php echo $userID; ?>&name=<?php echo $username; ?>';
sendReq.send(param);
document.getElementById('txt_message').value = '';
}
}
//When our message has been sent, update our page.
function handleSendChat() {
//Clear out the existing timer so we don't have
//multiple timer instances running.
clearInterval(mTimer);
getChatText();
}
function handleReceiveChat() {
if (receiveReq.readyState == 4) {
//Get a reference to our chat container div for easy access
var chat_div = document.getElementById('div_chat');
//Get the AJAX response and run the JavaScript evaluation function
//on it to turn it into a useable object. Notice since we are passing
//in the JSON value as a string we need to wrap it in parentheses
var response = eval("(" + receiveReq.responseText + ")");
for(i=0;i < response.messages.message.length; i++) {
chat_div.innerHTML += '<font class="chat_user">' + response.messages.message[i].time + ' ' + response.messages.message[i].user + '</font> : ';
chat_div.innerHTML += response.messages.message[i].text + '<br />';
chat_div.scrollTop = chat_div.scrollHeight;
lastMessage = response.messages.message[i].id;
}
window.onfocus = function (){
mTimer = setTimeout('getChatText();',10000); //Refresh our chat in 10 seconds
}
}
}
//This functions handles when the user presses enter. Instead of submitting the form, we
//send a new message to the server and return false.
function blockSubmit() {
sendChatText();
return false;
}
//This function handles the response after the page has been refreshed.
function handleResetChat() {
document.getElementById('div_chat').innerHTML = '';
getChatText();
}
</script> |
