Timing on GET info from PHP/SQL - javascript

Just for you to know I'm less than a newbie!
I have the following javascript code:
window.onload = function() {
renderTime();
getsec(myHandler);
countdown('countdown');
...
}
function myHandler(resultado) {
seconds = resultado;
}
function reqListener () {
console.log(this.responseText);
}
function getsec(callback) {
var indice = 1;
var oReq = new XMLHttpRequest();
oReq.onload = function() {
var variarr = JSON.parse(this.responseText);
callback(variarr[0]);
};
oReq.open("GET", "getsec.php?lei="+indice, true);
oReq.send();
}
This works perfectly for me. The intention is to get data from MySQL table through getsec.php every second. As you can see I have function countdown('countdown') that looks like this:
function countdown(element) {
...
interval = setInterval(function() {
...
if( runned == false){ // This condition happens
...
} else {
...
}
}, 1000);
}
I tryed to put function getsec(myHandler) inside function countdown('countdown')
if( runned == false){ // This condition happens
getsec(myHandler);
and I stop getting the information I want.
Can anyone explain me why?

Related

AJAX load animation for chat?

How do I add the slideDown jquery animation when I knew message is loaded? Perhaps I can't with my method for loading... A file takes user input and inserts into database. Another file pulls from database onto chatbox and styles.
Javascript Code:
var form = document.querySelector('form[name="chatbox"]');
form.addEventListener("submit", function (event) {
event.preventDefault();
});
function submitChat() {
if(chatbox.message.value == '') {
alert('Error: Missing Fields.');
return;
}
var message = chatbox.message.value;
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if(xmlhttp.readyState==4&&xmlhttp.status==100) {
document.getElementById('chatlog').innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open('GET','chat.php?message='+message, true);
xmlhttp.send();
chatbox.reset();
}
$(document).ready(function(e) {
$.ajaxSetup({cache:false});
setInterval(function() {$('#chatlog').load('logs.php');}, 200);
});
Please let me know if you need the PHP attached.. Thanks for the help! :)

jQuery Find and Replace is Hanging up the browser! Data size too big?

With alot of help from #kalley we have found out that If I comment the following two lines out the LAG is gone!
var $tableContents = $table.find('tbody')
var $html = $('<tbody/>').html(data);
But how do I keep the above but cancel out the LAG ?
MORE INFO:
The code below works but the problem is that the $.GET is causing the browser to hang until the ajax request completes. I need (flow control?) or something that will solve this problem without locking/hanging up the browser until ajax completes the GET request.
The biggest LAG/Lockup/Hang is at $.get("updatetable.php", since the others only return 7 or less (number) values and this one ('updatetable.php') returns alot more (200-300kb). I would like to implement some sort of flow control here or make the script wait like 5 secs before firing the update command for tablesort and before showing the toast message so that ajax has time to GET the $.get("updatetable.php"data I just don't understand why does it lockup the browser as it is getting the data? is it trying to fire the other commands and that's whats causing the LAG?
Here are the STEPS
1.
$.get("getlastupdate.php" Will fire every 10 secs or so to check if the date and time are the same the return data looks like this: 20130812092636 the format is: YYYmmddHHmmss.
2.
if the date and time are not the same as the last GET then $.get("getlastupdate2.php" will trigger and this data will be send back and placed into a toast message and dispalyed to the user $().toastmessage('showNoticeToast', Vinfoo);
3.
before or after the above ($.get("getlastupdate2.php") another GET will fire: $.get('updatetable.php' this will GET the updated table info. and replace the old one with the new info. and then update/resort the table
4.
at the end of it all I want to $.get("ajaxcontrol.php" and this will return a 1 or 2 if the user is logged in then it will be a 2 else it's a 1 and it will destroy the session and log the user out.
<script type="text/javascript" src="tablesorter/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="tablesorter/final/jquery.tablesorter.js"></script>
<script type="text/javascript" src="tablesorter/final/jquery.tablesorter.widgets.js"></script>
<script type="text/javascript" src="tablesorter/final/toastmessage/jquery.toastmessage-min.js"></script>
<script type="text/javascript" src="tablesorter/qtip/jquery.qtip.min.js"></script>
<script type="text/javascript">
var comper;
function checkSession() {
return $.get("ajaxcontrol.php", function (DblIn) {
console.log('checking for session');
if (DblIn == 1) {
window.location = 'loggedout.php';
}
}).then(updateTable);
}
function checkComper() {
var SvInfo;
var onResponse = function (comperNow) {
if (comper === undefined) {
comper = comperNow;
} else if (comper !== comperNow) {
var Vinfoo;
comper = comperNow;
// returning this $.get will make delay done until this is done.
return $.get("getlastupdate2.php", function (primaryAddType) {
Vinfoo = primaryAddType;
$().toastmessage('showNoticeToast', Vinfoo);
}).then(checkSession);
}
};
$.get('getlastupdate.php').then(onResponse).done(function () {
tid = setTimeout(checkComper, 2000);
});
}
function updateTable() {
return $.get('updatetable.php', function (data) {
console.log('update table');
var $table = $("table.tablesorter");
var $tableContents = $table.find('tbody')
var $html = $('<tbody/>').html(data);
$tableContents.replaceWith('<tbody>' + data + '</tbody>')
//$tableContents.replaceWith($html)
$table.trigger("update", [true]);
var currentUrl = document.getElementById("frmcontent").contentWindow.location.href;
var urls = ['indexTOM.php', 'index1.php'],
frame = document.getElementById('frmcontent').contentDocument;
for (var i = 0; i < urls.length; i++) {
var url = urls[i];
if (frame.location.href.indexOf(url) !== -1) {
frame.location.reload()
}
}
$('[title!=""]').qtip({});
});
};
$(function () {
var tid = setTimeout(checkComper, 2000);
$("#append").click(function (e) {
// We will assume this is a user action
e.preventDefault();
updateTable();
});
// call the tablesorter plugin
$("table.tablesorter").tablesorter({
theme: 'blue',
// hidden filter input/selects will resize the columns, so try to minimize the change
widthFixed: true,
// initialize zebra striping and filter widgets
widgets: ["saveSort", "zebra", "filter"],
headers: {
8: {
sorter: false,
filter: false
}
},
widgetOptions: {
filter_childRows: false,
filter_columnFilters: true,
filter_cssFilter: 'tablesorter-filter',
filter_filteredRow: 'filtered',
filter_formatter: null,
filter_functions: null,
filter_hideFilters: false, // true, (see note in the options section above)
filter_ignoreCase: true,
filter_liveSearch: true,
filter_reset: 'button.reset',
filter_searchDelay: 300,
filter_serversideFiltering: false,
filter_startsWith: false,
filter_useParsedData: false
}
});
// External search
$('button.search').click(function () {
var filters = [],
col = $(this).data('filter-column'), // zero-based index
txt = $(this).data('filter-text'); // text to add to filter
filters[col] = txt;
$.tablesorter.setFilters($('table.hasFilters'), filters, true); // new v2.9
return false;
});
});
</script>
Maybe instead of using setInterval, you should consider switching to setTimeout. It will give you more control over when the time repeats:
function checkComper() {
var SvInfo;
var onResponse = function (comperNow) {
if (comper === undefined) {
comper = comperNow;
} else if (comper !== comperNow) {
var Vinfoo;
comper = comperNow;
// returning this $.get will make delay done until this is done.
return $.get("getlastupdate2.php", function (primaryAddType) {
Vinfoo = primaryAddType;
$().toastmessage('showNoticeToast', Vinfoo);
}).then(checkSession);
}
};
$.get('getlastupdate.php').then(onResponse).done(function () {
tid = setTimeout(checkComper, 10000);
});
}
var tid = setTimeout(checkComper, 10000);
Then you can keep it async: true
Here's a fiddle showing it working using echo.jsontest.com and some fudging numbers.
Since the click event callback seems to be where the issue is, try doing this and see if it removes the lag (I removed other comments to make it more brief):
function checkSession() {
return $.get("ajaxcontrol.php", function (DblIn) {
console.log('checking for session');
if (DblIn == 1) {
window.location = 'loggedout.php';
}
}).then(updateTable);
}
function updateTable() {
return $.get('updatetable.php', function (data) {
console.log('update table');
var $tableContents = $table.find('tbody')
//var $html = $('<tbody/>').html(data);
//$tableContents.replaceWith($html);
// replaceWith text seems to be much faster:
// http://jsperf.com/jquery-html-vs-replacewith/4
$tableContents.replaceWith('<tbody'> + data + '</tbody>');
//$table.trigger("update", [true]);
var currentUrl = document.getElementById("frmcontent").contentWindow.location.href;
var urls = ['indexTOM.php', 'index1.php'],
frame = document.getElementById('frmcontent').contentDocument;
for (var i = 0; i < urls.length; i++) {
var url = urls[i];
if (frame.location.href.indexOf(url) !== -1) {
frame.location.reload()
}
}
$('[title!=""]').qtip({});
});
};
$("#append").click(function (e) {
// We will assume this is a user action
e.preventDefault();
updateTable();
});
I commented out $table.trigger("update", [true]) since if you sort the table on the server before you return it, you shouldn't need to run that, which I'm almost certain is where the bottleneck is.
It is really hard untangle the mess you have but if what you want is ajax requests every 10 seconds it make sense to separate this logic from business logic over data from server.
Your code would also really benefit from using promises. Consider this example
$(document).ready(function() {
var myData = { }
, ajaxPromise = null
setInterval(callServer, 1000)
function callServer() {
ajaxPromise = updateCall()
.then(controlCall)
.done(handler)
.error(errorHandler)
}
function updateCall() {
return $.get('updateTable.php', function(data) {
myData.update = data
})
}
function controlCall( ) {
return $.get('ajaxControl.php', function(data) {
myData.control = data
})
}
function handler() {
console.dir(myData)
}
function errorHandler(err) {
console.log(err)
console.dir(myData)
}
})

Javascript setTimeout and Chrome Workers, I don't get it

I have the following files: (inc.js is included in my html page)
inc.js
var field = new Worker('ajax.js');
field.addEventListener('message', function(e) {
var data = JSON.parse(e.data);
document.getElementById('fieldToUpdate').innerHTML = data[0];
}, false);
field.postMessage(0);
ajax.js
var xhr = new XMLHttpRequest();
function getData() {
xhr.open('get', 'field.php');
xhr.onreadystatechange = processData;
xhr.send(null);
}
function processData() {
if (xhr.readyState == 4) {
self.postMessage(xhr.responseText);
setTimeout(getData, 5000);
}
}
onmessage = function() {
setTimeout(getData, 5000);
}
My Problem is now, that this Script doesn't make one http request each 5 seconds but it starts as soon as one is finished.

AJAX function parameter is null?

i got a problem with JS:
On line 1 to 4 I take all "a"-Elements from the DOM and get their hrefs.
later I want to reload the URL via AJAX, but the href does not arrive correctly... Whats wrong?
$(document).ready(function(){
$('a').click(function(e){
ajaxReload($(this).attr('href'));
e.preventDefault();
});
});
function ajaxReload(href) {
var xmlhttp = null;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
// IE
else if (window.ActiveXObject) {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET", href, true);
xmlhttp.onreadystatechange = function() {
if(xmlhttp.readyState != 4) {
document.write('loading');
}
if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
alert('hello');
//alert('getting '+xmlhttp.status+' for '+href);
var pureHTML = xmlhttp.responseText;
var ajaxstart = pureHTML.indexOf('<!-- AJAX START -->');
var ajaxend = pureHTML.indexOf('<!-- AJAX END -->');
var ajaxContent = pureHTML.substring(ajaxstart, ajaxend);
var writeContent = document.getElementById('content');
writeContent.innerHTML = ajaxContent;
}
}
xmlhttp.send(null);
}
Sorry if I've misunderstood your code. I think that you simply need to (at least approximately) just remove code as commented below:
//$('a').click = function(href) {
var pureHTML = xmlhttp.responseText;
var ajaxstart = pureHTML.indexOf('<!-- AJAX START -->');
var ajaxend = pureHTML.indexOf('<!-- AJAX END -->');
var ajaxContent = pureHTML.substring(ajaxstart, ajaxend);
$("content").html(ajaxContent);
// ajaxReload(href); //this would cause a loop?
// return false;
//}
To answer your later question - you can change your event propagation handling to:
$(document).ready(function(){
$('a').click(function(e){
ajaxReload($(this).attr('href'));
e.preventDefault();
});
});
And for the further comments, maybe try changing your:
document.write('loading');
To:
$("content").html(xmlhttp.status); //so now you can see the loading status for testing

onload Functions Firing Out Of Order

Any idea why the following code:
<script>
var access_token;
var access_token_secret;
function Login(){
img = document.getElementById('authenticate');
img.src = 'authenticate.png';
login = document.getElementById('login');
login.style.visibility="visible";
}
function cookieHandlerStep1(){
chrome.cookies.get({
url:URL_GOES_HERE,
name:'access_token'
},
function(cookie){
if(cookie){
access_token = cookie['value'];
cookieHandlerStep2();
} else{
Login();
}
});
}
function cookieHandlerStep2(){
chrome.cookies.get({
url:URL_GOES_HERE,
name:'access_token_secret'
},
function(cookie){
if(cookie){
access_token_secret = cookie['value'];
Interact();
} else{
Login();
}
});
}
function Interact(){
alert(access_token);
xhr = new XMLHttpRequest();
xhr.open("GET", URL_GOES_HERE, true);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
document.write(xhr.responseText);
}
}
xhr.send();
}
</script>
<body onload="cookieHandlerStep1(),cookieHandlerStep2(),Interact()">
Could possibly have the functions executing out of sequence?
They're not firing out of order. You've provided callbacks to chrome.cookies.get which are not guaranteed to be called before the rest of the code. The first function returns before the callbacks are fired, and the next two (cookieHandlerStep2() and Interact()) get called.
However, in these callbacks, cookieHandlerStep1() is already calling cookieHandlerStep2() which then calls Interact() - so I presume what you actually want in your onload is just the first function to initiate the chain:
<body onload="cookieHandlerStep1()">

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