This question already has answers here:
How to update jQuery Progress bar according to a value at the session variable in PHP
(2 answers)
Closed 9 years ago.
Idea is to update progressbar value when PHP variable changes:
<script>
$(function() {
$( "#progressbar" ).progressbar({
value: <?php echo $_SESSION['value'] ?>
});
});
</script>
I tried:
<?php
$_SESSION['value'] = 10;
sleep(2);
$_SESSION['value'] = 30;
sleep(2);
$_SESSION['value'] = 50;
sleep(2);
$_SESSION['value'] = 70;
sleep(2);
$_SESSION['value'] = 90;
?>
but progressbar is set to last variable 90 only. I want it to continuously update for five times as the value of the variable changes.
Is it possible to do this with jQuery and PHP?
This is possible but only using AJAX as javascript doesn't have access to the PHP session.
The javascript only runs once the PHP file has finished executing which is why you're only seeing it update with the last value.
JS:
setInterval(function() {
$.get("currentProgress.php", function(data) {
$("#progressbar").progressbar({
value: data
});
});
}, 1000); // updates every second
PHP file:
<?php
// work out the current progress of whatever you're checking on
echo $value;
?>
Update: Maybe this is more what you're after: http://w3shaman.com/article/php-progress-bar-script - it can be easily modified to include the jQuery progress bar.
$_SESSION exists only on the server-side, so before your browser even receives the response, it will go through all the five stages. The value that will be transmitted is 90.
If you want to monitor a server-side process you will have to use a different approach, e.g. via ajax.
Related
This question already has answers here:
What is the difference between client-side and server-side programming?
(3 answers)
Closed 9 years ago.
I want to set session inside the javascript. But all the time this function return false value. Please tell me the error of this code.
<script>
function myFunction(){
var r=confirm("Would you like to add another item ?");
if (r==true) {
alert('ok');
var varname = '<?php echo $_SESSION["redirect"]=1; ?>';
}
if(r==false) {
alert('bad');
var varname = '<?php echo $_SESSION["redirect"]=2; ?>';
}
}
</script>
You can't evaluate PHP on the client. Do an AJAX request to the server setting the session variable instead.
Javascript runs on the client side, so you'll need to perform an AJAX call to a server side script that will change the sessions value.
Something in the lines of:
function changeSession()
{
$.ajax({
url: /change_session.php?value=1&key=redirect,
dataType:"html"
});
}
And in change_session.php:
<?php $_SESSION[$_REQUEST['key']]=$_REQUEST['value'] ?>
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
pass php variable value to javascript
I want to create a progress bar, the value of the progress will be coming from PHP.
<div class="prog" id="progressbar"></div>
<label id="amount">
<?php echo $cast; ?></label>
I have this kind of javascript.
<script>
$(function() {
$( "#progressbar" ).progressbar({
value: 0
});
});
</script>
How can I throw the value $cast in my script?
<script>
$(function() {
$( "#progressbar" ).progressbar({
value: <?php echo intval($cast);?>
});
});
</script>
Javascript is run in Client (browser), while PHP is run on server. You can't cast varble from PHP to javascript like that.
With print progress:
<?php echo $cast; ?>
it just display the value of current run time, it is not updated.
If you have a link to check value of progress bar, just use ajax POST or GET to make change.
How do I reload this input once after 3 seconds has passed after the webpage has loaded. using javascript
<input type="text" name="steamID" id="steamID" value="<?php echo $steamid; ?>">
Try looking at this answer on SO:
Reload random div content every x seconds
If that doesn't work for you, you will have to use ajax to get new content. Look at jQuery's API here:
http://api.jquery.com/jQuery.ajax/
Or if you're not using jQuery, look at this for a tutorial on AJAX:
http://www.w3schools.com/ajax/default.asp
Otherwise, for more help, please post more of your code -- but ajax will have to be used
If you want the PHP in your code to be run again, you need to make you code a little more complicated.
You will need the following components
a php file that will lookup and print $steamid only.
a javascript function that uses AJAX to get the information from the php file, sets the value of your input
call the javascript on page load, then set an interval for 3 seconds and call it again.
But based on this...
The problem i have that the PHP var $steamid are set after the input has been created so all i need todo is reload the input so the $steamid will show.
... I think you just need to re-order your PHP code.
By reset, I am assuming you mean set the value to null.
$(window).load(function(){
setTimeout( function() {
document.getElementById("steamID").value = "";
},3000);
});
EDIT: Based on your further description, wait until steamID is set, then put this on the page:
<script type="text/javascript">
document.getElementById("steamID").value = "<?php echo $steamid; ?>";
</script>
<?php
echo "<script type='text/javascript'>";
$steamid = "testing 1,2,3";
echo " var sID = '".$steamid."';";
?>
function setupRefresh() {
setInterval("refreshVal()", 3000);
}
function refreshVal() {
var e = document.getElementById('steamID');
e.value = sID;
}
</script>
I have an index.php file that I would like to run getdata.php every 5 seconds.
getdata.php returns multiple variables that need to be displayed in various places in index.php.
I've been trying to use the jQuery .load() function with no luck.
It's refreshing the 12 <div> elements in various places on the index.php, but it's not re-running the getdata.php file that should get the newest data.
But If I hit the browser refresh button, the data is refreshed.
getdata.php returns about 15 variables.
Here is some sample code:
<script>
var refreshId = setInterval(function()
{
$('#Hidden_Data').load('GetData.php'); // Shouldn´t this return $variables
$('#Show_Data_001').fadeOut("slow").fadeIn("slow");
$('#Show_Data_002').fadeOut("slow").fadeIn("slow");
$('#Show_Data_003').fadeOut("slow").fadeIn("slow");
$('#...').fadeOut("slow").fadeIn("slow");
}, 5000); // Data refreshed every 5 seconds
*/
</script>
Here's an example of GetData.php:
$query = "SELECT column1, COUNT(column2) AS variable FROM table GROUP BY column";
$result = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_array($result)){
$column1 = $row['column1 '];
$variable = $row['variable '];
if($column1 == "Text1") { $variable1 = $variable; }
elseif($column1 == "Text2") { $variable2 = $variable; }
... continues to variable 15 ...
}
Then further down the page the HTML elements display the data:
<div id="Hidden_Data"></div>
<div id="Show_Data_001"><?php echo $variable1; ?></div>
<div id="Show_Data_002"><?php echo $variable2; ?></div>
<div id="Show_Data_003"><?php echo $variable3; ?></div>
...
I tried using the data parameter as suggested here:
https://stackoverflow.com/a/8480059/498596
But I couldn't fully understand how to load all the variables every 5 seconds and call them on the index page.
Today the GetData.php page just returns $variable1 = X; $variable2 = Y and so on.
UPDATE
For some reason the jQuery is not loading the GatData.php file and refreshing the variables.
I tried adding to "Hidden_Data" to the include('GetData.php') and then the variables are readable on the page.
If I remove this part, the page displays "variable not set" warning that suggesting that the jQuery is not loading the GetData.php script into the Hidden_Data <div>.
Try
<script>
var refreshId = setInterval(function()
{
$('#Hidden_Data').load('GetData.php', function() { // Shouldn´t this return $variables
$('#Show_Data_001').fadeOut("slow").fadeIn("slow");
$('#Show_Data_002').fadeOut("slow").fadeIn("slow");
$('#Show_Data_003').fadeOut("slow").fadeIn("slow");
$('#...').fadeOut("slow").fadeIn("slow"); });
}, 5000); // Data refreshed every 5 seconds
*/
</script>
Above is assuming, that your code returns snippet of HTML elements (Show_Data_XXX), but now that you've clarified your question above wont help you alone...
What you need to do is either in your php send back new value elements or send back your results as data and update existing elements.
Put your elements into a php Array and then send it back
data.php after sql call
$results = Array();
while($row = mysql_fetch_array($result)){
$column1 = $row['column1 ']; // change Text1 in db to Show_Data_001 in html or vice versa
$variable = $row['variable '];
$results[$column1] = $variable;
}
echo json_encode($results);
in your javascript something like this...
$.getJSON('GetData.php',function(data) {
$.each(data, function(key, val) {
$('#'+key).text(val);
});
});
I didn't put the fadeOut and fadeIn into the example, because it complicates it a bit. You could do fadeOut to all those elements before calling getJSON and the fadeIn as the results pouring in. Hope this helps
First of all, make sure you have correct respond from server, just like this:
//We won't use load() to load content for now
window.setInterval(function(){
$.ajax({
url : "path_to_your_php_script.php",
type : "GET",
beforeSend: function(){
//here you can display, smth like "Please wait" in some div
},
error : function(msg){
//You would know if an error occurs
alert(msg);
},
success : function(respondFromPHP){
//Are you getting distinct results every 5 sec?
alert(respondFromPHP);
return;
//if respondFromPHP contains data you want
//ONLY THEN, add some effects
}
});
}, 5000);
The only difference between this approach and yours, is that, you can handle errors and make sure you are getting data you want.
Can you show me the code of GetData.php?
Rather than using Jquery.load you can actually get the page with $.post or $.get and format your results from GetData.php to Json or xml you can easily map it to your javascript.
Using $.post it will allow you to have a callback after getting the value from GetData.php and you can check it if it's working right or not. If it gets a data from your GetData.php then you can populate it to your DIV elements.
You can check more information regarding POST and GET here:
http://api.jquery.com/jQuery.post/
Ok , I'm having trouble to solve this , I'm a php / C# web developer , and have no experience or knowledge in Javascript, I have to do just this one thing that needs Javascript:
When a certain page loads, a counter starts. The client must stay on this page for 20 seconds. after, I want to execute php code.
So there are 2 issues concerning me, first: how do I stop the counter, if client leaves the page (meaning the page is not in focus).
2) How can I execute php in javascript? , or call a php function from Javascript.
The code I have so far is this:
<html>
<head>
</head>
<body>
<div id='timer'>
<script type="text/javascript">
COUNTER_START = 20
function tick () {
if (document.getElementById ('counter').firstChild.data > 0) {
document.getElementById ('counter').firstChild.data = document.getElementById ('counter').firstChild.data - 1
setTimeout ('tick()', 1000)
} else {
document.getElementById ('counter').firstChild.data = 'done'
}
}
if (document.getElementById) onload = function () {
var t = document.createTextNode (COUNTER_START)
var p = document.createElement ('P')
p.appendChild (t)
p.setAttribute ('id', 'counter')
var body = document.getElementsByTagName ('BODY')[0]
var firstChild = body.getElementsByTagName ('*')[0]
body.insertBefore (p, firstChild)
tick()
}
</script>
</div>
</body>
</html>
and I also want the timer to start ticking when the client gets back on page
Thank you very much for ur help in advance
You could do this using jQuery.
Recycling an old Stackoverflow post, try this:
var window_focus;
var counter = 1000;
// on focus, set window_focus = true.
$(window).focus(function() {
window_focus = true;
});
// when the window loses focus, set window_focus to false
$(window).focusout(function() {
window_focus = false;
});
// this is set to the ('click' function, but you could start the interval/timer in a jQuery.ready function: http://api.jquery.com/ready/
$(document).one('click',function() {
// Run this function every second. Decrement counter if window_focus is true.
setInterval(function() {
$('body').append('Count: ' + counter + '<br>');
if(window_focus) { counter = counter-1; }
}, 1000);
});
Demo and old post
DEMO | Old So post
Update
Probably because the demo runs in 4 iframes, the $(window).focus bit only works on the iframe actually running the code (the bottom-right window).
jQuery
jQuery.com (How jQuery works) | Example (back to basics halfway down the page) | If you use the 2nd link, also read this
In regards to your first question about detecting if the window is out of focus, see this answer: Is there a way to detect if a browser window is not currently active?
It is possible, but only very new browsers support this so it may not be useful based on current browser support.
To trigger PHP code from Javascript, you would have to make an AJAX call to a server-side PHP script to invoke PHP since JS is client-side and PHP is server-side.