Develop Reference

Auto Refresh PHP Function without reloading page Javascript / Ajax

Is it possible to use Ajax, Jquery or Javascript to call a specific PHP Function and refresh / reload it every 10 seconds for example inside a specific Div or areas?
Connection.php
function TerminalStatus ($IPAddress, $portStatus ) // Responsible for current terminal status
{
$connectStatus = fsockopen($IPAddress, $portStatus, $errno, $errstr, 10); // Build cconnection to Terminal socket 25001
if (!$connectStatus) {
echo "$errstr ($errno)<br />\n";
} else {
$Status = fgets($connectStatus) ;
echo $Status ();
}
}
This connection is just to see the current status of a terminal.
I want to see the status of this function at the bottom of my index.php without refreshing the whole page.
I can accomplish this by putting this function in its own PHP Files (status.php) and using Javascript in the following way:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js"></script>
<script type="text/javascript">
var auto_refresh = setInterval(
function ()
{
$('#Status').load('status.php');
}, 1000); // refresh every 1000 milliseconds
</script>
But i just want to utilise the function instead.
Is this possible?

The solution you have already is the correct way to do this: the JavaScript fetches a URL, and that URL renders the appropriate piece of content.
It's important to remember that, as far as the web browser is concerned, PHP doesn't exist. Any request from the browser - whether you've typed in a URL, followed a link, submitted a form, made an AJAX request, etc - is just a message to some remote server for a particular URL, perhaps along with some extra headers and body data. When the server receives that request, it can do whatever it likes to generate a response to the browser.
So when you write $('#Status').load('status.php');, the browser is sending a request to the server, which happens to be configured to execute the PHP script status.php. You can then do what you like in PHP to produce the response - but there is no direct link between a request and a PHP function.
However, as others have pointed out, you don't have to create a new PHP file for every piece of behaviour you want, because inside the PHP code you can check things like:
the query string parameters, in $_GET
submitted form data, in $_POST
the HTTP headers from the request
These can be set by your JavaScript code to whatever you like, so you could for instance write $('#Status').load('index.php?view=statusonly'); and then at the top of index.php have code like this:
if ( $_GET['view'] === 'statusonly'] ) {
echo get_status();
exit;
}
How you arrange this is entirely up to you, and that's what programming is all about 🙂

That's impossible to do this operation just with the PHP function.
you should use javascript as you use that or use socket in javascript to connect you status.php and update without refresh the whole page.

I'm not sure if i understood the problem but you can use AJAX to execute specific function. Something like this:
First build your ajax:
$.ajax({
type: "POST",
url: "URL_TO_PHP_FILE",
data: "refreshStatus", // this will call the function
success: function(status){
$('#Status').text(status); // this will load the info you echo
},
});
Since you want to do it every second - wrap the whole thing with interval (i use your code from the question):
var auto_refresh = setInterval( function () {
$.ajax({
type: "POST",
url: "URL_TO_PHP_FILE",
data: "refreshStatus",
success: function(status){
$('#Status').text(status);
},
});
}, 1000);
Then, on you PHP_FILE add condition the execute the specific function when POST been done:
if ($_SERVER["REQUEST_METHOD"] == "POST" && $_POST['refreshStatus']) {
// run this code
}
Is that what you aimed to achieve?

jQuery::load() supports fragment identifiers. So you can just load the part that you want to replace:
$( "#Status" ).load( "status.php #PartId" );
This will load the HTML output of the script and extract the part. The PHP script will run completely - the rest of the HTML output will be thrown away on the JS side.

How to handle Ajax post requests in a Wordpress plugin?

I'm trying to figure out how Ajax and Wordpress plugins work, but it seems to be pretty badly documented. Ideally what I want is:
The plugin gets it own Ajax url to use, this is defined globally.
The plugin can handle Ajax requests
I understand that there are two actions that are used for this. One for logged in users and one for users without an account or privileges. However, I just want to create an Ajax endpoint for a form.
I'm not looking for code snippets, just need to be pointed in the write direction as to Wordpress Plugins and Ajax handling.

I implemented below own AJAX functionality in functions.php, Just try this in plugin,
functions.php :
function prefix_ajax_delete_search() {
global $wpdb;
$user_id = get_current_user_id();
$wpdb->delete('sf_save_search', array('id' => $_POST['tid']) );
wp_die();
}
add_action( 'wp_ajax_delete_search', 'prefix_ajax_delete_search' );
Script.js:
function deleteSearch( tid) {
var url = window.location.href;
jQuery.post(
ajaxurl,
{
'action': 'delete_search',
'tid': tid,
},
function(response){
location.reload();
}
);
}

Ajax Call Confusion

before we start apologies for the wording and lack of understanding - I am completely new to this.
I am hoping to run a php script using Ajax - I don't need to send any data to the php script, I simply need it to run on button press, after the script is run I need to refresh the body of the page. What I have so far:
HMTL Button with on click:
<font color = "white">Next Question</font>
JS Ajax call:
function AjaxCall() {
$.ajax({
url:'increment.php',
type: 'php',
success:function(content,code)
{
alert(code);
$('body').html(content);
}
});
}
this runs the php script but doesn't stay on the current page or refresh the body - has anyone got any ideas - apologies if this is completely wrong I'm learning - slowly.
Many thanks in advance.
**As a small edit - I don't want a user to navigate away from the page during the process

How about using load instead of the typical ajax function?
function AjaxCall() {
$(body).load('increment.php');
}
Additionally, if you were to use the ajax function, php is not a valid type. The type option specifies whether you are using GET or POST to post the request.
As far as the dataType option (which is what I think you mean), The Ajax doesn't care what technology the called process is using (like ASP or PHP), it only care about the format of the returned data, so appropriate types are html, json, etc...
Read More: http://api.jquery.com/jquery.ajax/
Furthermore, if you are replacing the entire body content, why don't you just refresh the page?

your ajax should be
function AjaxCall() {
$.ajax({
url:'increment.php',
type: 'post',
success:function(data)
{
console.log(data);
$('body').html(data);
}
});
}
if you want to learn ajax then you should refer this link
and if you just want to load that page then you can use .load() method as "Dutchie432" described.

If you are going to fire a javascript event in this way there are two ways to go about it and keep it from actually trying to follow the link:
<font color = "white">Next Question</font>
Note the return false;. This stops the following of the link. The other method would be:
<font color = "white">Next Question</font>
Note how this actually modifies the href to be a javascript call.

You can study about js and ajax here http://www.w3schools.com/ajax/default.asp will help a lot. Of course all js functions if called from internal js script should be inside <script></script> and if called from external you call the js gile like <script src"somejs.js"></script> and inside js there is no need for <script> tags again. Now all those function do not work by simply declaring them. So this:
function sayHello(){
alert("Happy coding");
}
doesn't work because it is just declared and not called into action. So in jQuery that you use after we declare some functions as the sayHello above we use:
jQuery(document).ready(function($){
sayHello();
});
Doing this we say that when everything is fully loaded so our DOM has its final shape then let the games begin, make some DOM manipulations etc
Above also you don't specify the type of your call meaning POST or GET. Those verbs are the alpha and omega of http requests. Typically we use GET to bring data like in your case here and POST to send some data for storage to the server. A very common GET request is this:
$.ajax({
type : 'GET',
url : someURL,
data : mydata, //optional if you want to send sth to the server like a user's id and get only that specific user's info
success : function(data) {
console.log("Ajax rocks");
},
error: function(){
console.log("Ajax failed");
}
});

Try this;
<script type="text/javascript">
function AjaxCall() {
window.location.reload();
}
</script>
<body>
<font color = "white">Next Question</font>
</body>

jquery messi addon help needed using load method

Im trying to use messi jquery script on my site but I am unsure of how the load method it uses passes params on.
The example messi gives for creating a ajax call popup is:
Messi.load('test2.php', {params: {user: 'demo', password: '1234'}});
but i've tried both post and get method to capture the parameters in test2.php but without success.
for example
$user=$_POST['user'];
and
$get=$_GET['user'];
but both return a undefined index error
The load method is supposed to be an ajax call so I presumed it would be either a post or get request.
Is there another way I can capture the parameters?

Try with
$user = $_REQUEST['user'];
Anyway, have you loaded before jQuery? Messi script needs it to work!
Or, you can call your ajax request externally, then load a Messi popup with the ajax response.
$.get( "test2.php", { user: "username", password: "234234" } )
.done(function( data ) {
Messi.alert(data);
});
(if you take a look on the github Messi's library, that code makes an ajax call and then opens a Messi alert. This is the js library not minified: https://github.com/marcosesperon/Messi/blob/master/messi.js#L256 )

Yii renderPartial with external javascript

I have a page view that makes an ajax call and updates the contents of the page with renderPartial.
So page.php -> _pagePartial.php (ajax update)
in page.php I want to include the javascript files once, then have the DOM modifications apply after the ajax rendering happens. It doesn't make sense to have this JS file load on every AJAX refresh.
For example in page.php
$baseUrl = Yii::app()->baseUrl;
$basePath = Yii::app()->basePath;
$cs = Yii::app()->getClientScript();
$cs->registerScriptFile($baseUrl . '/js/jquery.ui.js'); // load one time!
then in pagePartial.php
// every ajax partial load
$('#sortable-list-left').sortable({
connectWith:'.productEntryCol',
placeholder: 'ui-state-highlight',
update: function(event, ui) {
var sortOrderLeft = getSortOrder('sortable-list-left');
var sortOrderRight = getSortOrder('sortable-list-right');
var projectId = '" . $project_id . "';
$.ajax({
data: { left: sortOrderLeft, right : sortOrderRight, id : projectId},
url: '/project/ajaxUpdateOrder',
type: 'POST',
success: function(response){
// process JSON response
var obj = jQuery.parseJSON(response);
}
});
}
});
The problem is after _pagePartial loads via AJAX, it can't use the .sortable() method.
What is the proper way to handle this ?
Thanks

The way I handle this is on the main view on the $.load or $.ajax or whatever it is, add your code on the success function.
So for example:
$.get('_pagePartial.php', null, function(html) {
$('#result').html(html);
$('#sortable-list-left').sortable({
//all your sortable code
});
});
Another option is to add your javascript on your ajax loaded page ('_pagePartial.php') into a function like so:
function firejs() {
$('#sortable-list-left').sortable({
//all your sortable code
});
}
Then on your successful ajax call on your main view ('page.php') simply add this:
$.get('_pagePartial.php', null, function(html) {
$('#result').html(html);
firejs();
});
You can bind to an object until it is added to the DOM and it isn't added to the DOM until the ajax call has finished successfully and the result is added to the DOM.
Also just an FYI yii has jqueryui built in you can simply say:
Yii::app()->clientScript->registerCoreScript('jquery.ui');
Yii::app()->clientScript->registerCoreScript('jquery');

For people like me who has the same issue, even with:
Yii::app()->clientscript->scriptMap['jquery.js'] = false;
in the renderPartial and still not work. I've found another solution, way more effective I think. The easiest solution is to set the 4th parameter of renderPartial.
RenderPartial-detail
public string renderPartial(string $view, array $data=NULL, boolean $return=false, boolean $processOutput=false)
It is about processOutput.If you put it to true, then Jquery will be loaded in your render Partial.
Hope this will help someone...