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I have a javascript that needs to pass data to a php variable. I already searched on how to implement this but I cant make it work properly. Here is what I've done:
Javascript:
$(document).ready(function() {
$(".filter").click(function() {
var val = $(this).attr('data-rel');
//check value
alert($(this).attr('data-rel'));
$.ajax({
type: "POST",
url: 'signage.php',
data: "subDir=" + val,
success: function(data)
{
alert("success!");
}
});
});
});
Then on my php tag:
<?php
if(isset($_GET['subDir']))
{
$subDir = $_GET['subDir'];
echo($subDir);
}
else
{
echo('fail');
}?>
I always get the fail text so there must be something wrong. I just started on php and jquery, I dont know what is wrong. Please I need your help. By the way, they are on the same file which is signage.php .Thanks in advance!
When you answer to a POST call that way, you need three things - read the data from _POST, put it there properly, and answer in JSON.
$.ajax({
type: "POST",
url: 'signage.php',
data: {
subDir: val,
}
success: function(answer)
{
alert("server said: " + answer.data);
}
});
or also:
$.post(
'signage.php',
{
subDir: val
},
function(answer){
alert("server said: " + answer.data);
}
}
Then in the response:
<?php
if (array_key_exists('subDir', $_POST)) {
$subDir = $_POST['subDir'];
$answer = array(
'data' => "You said, '{$subDir}'",
);
header("Content-Type: application/json;charset=utf-8");
print json_encode($answer);
exit();
}
Note that in the response, you have to set the Content-Type and you must send valid JSON, which normally means you have to exit immediately after sending the JSON packet in order to be sure not to send anything else. Also, the response must come as soon as possible and must not contain anything else before (not even some invisible BOM character before the
Note also that using isset is risky, because you cannot send some values that are equivalent to unset (for example the boolean false, or an empty string). If you want to check that _POST actually contains a subDir key, then use explicitly array_key_exists (for the same reason in Javascript you will sometimes use hasOwnProperty).
Finally, since you use a single file, you must consider that when opening the file the first time, _POST will be empty, so you will start with "fail" displayed! You had already begun remediating this by using _POST:
_POST means that this is an AJAX call
_GET means that this is the normal opening of signage.php
So you would do something like:
<?php // NO HTML BEFORE THIS POINT. NO OUTPUT AT ALL, ACTUALLY,
// OR $.post() WILL FAIL.
if (!empty($_POST)) {
// AJAX call. Do whatever you want, but the script must not
// get out of this if() alive.
exit(); // Ensure it doesn't.
}
// Normal _GET opening of the page (i.e. we display HTML here).
A surer way to check is verifying the XHR status of the request with an ancillary function such as:
/**
* isXHR. Answers the question, "Was I called through AJAX?".
* #return boolean
*/
function isXHR() {
$key = 'HTTP_X_REQUESTED_WITH';
return array_key_exists($key, $_SERVER)
&& ('xmlhttprequest'
== strtolower($_SERVER[$key])
)
;
}
Now you would have:
if (isXHR()) {
// Now you can use both $.post() or $.get()
exit();
}
and actually you could offload your AJAX code into another file:
if (isXHR()) {
include('signage-ajax.php');
exit();
}
You are send data using POST method and getting is using GET
<?php
if(isset($_POST['subDir']))
{
$subDir = $_POST['subDir'];
echo($subDir);
}
else
{
echo('fail');
}?>
You have used method POST in ajax so you must change to POST in php as well.
<?php
if(isset($_POST['subDir']))
{
$subDir = $_POST['subDir'];
echo($subDir);
}
else
{
echo('fail');
}?>
Edit your javascript code change POST to GET in ajax type
$(document).ready(function() {
$(".filter").click(function() {
var val = $(this).attr('data-rel');
//check value
alert($(this).attr('data-rel'));
$.ajax({
type: "GET",
url: 'signage.php',
data: "subDir=" + val,
success: function(data)
{
alert("success!");
}
});
});
});
when you use $_GET you have to set you data value in your url, I mean
$.ajax({
type: "POST",
url: 'signage.php?subDir=' + val,
data: "subDir=" + val,
success: function(data)
{
alert("success!");
}
});
or change your server side code from $_GET to $_POST
I am currently migrating an already built web application to MVC, and I'm figuring out that I'm too newbie to do some kind of changes. There are some ajax calls that are freaking me out. I'll try to be as clear as possible, but due to my inexperience I'm not sure if I won't let some important information by the way.
The point is in the old application, things go this way:
In the php code:
if ($action_user == 'show_alerts') {
$list = array();
$query = "SELECT alert_type FROM alert_contact WHERE NOT
deleted AND user_email=" . typeFormat($email);
$result = mysqli_query($db, $query) or die('Error in query "'.$query . '": ' . mysqli_error($db));
while ($db_field = mysqli_fetch_assoc($result)) {
$list[] = $db_field['alert_type'];
}
echo json_encode($list);
In the jquery code:
$.ajax({
type: 'POST',
url: 'userpost.php',
data: $('#userForm').serialize(),
cache: false,
dataType: 'json'
Here comes my problem, and since I don't have an userpost.php file anymore, I have to send it to the index.php and call my users component by a get petition, which I don't like, but I coudn't find another way to do it. And, what is even worse, I don't know at all how ajax is getting the variables that it needs. It must be a pretty basic mistake, but I recognize my skills at this point are't so good. That's what I'm doing in my version:
In the php code:
if ($action_user == 'show_alerts') {
$list = ModelUser::getAlertContact($act_email);
echo json_encode($list);//I predict that ajax don't reach this line, but not sure
}
In the jquery code:
$.ajax({
type: 'POST',
url: 'index.php?option=users',
data: $('#userForm').serialize(),
cache: false,
dataType: 'json',
success: function(data) {
alert ('gotcha');
$.each(alertsarray, function(index, value) {
if ($.inArray(value, data) === -1) {
$("#sub" + value).prop("checked", false);
$('#alert' + value).removeClass("list_alert_sub");
}
else {
$("#sub" + value).prop("checked", true);
$('#alert' + value).addClass("list_alert_sub");
}
});
},
error: function(data) {
alert("¡Error (ajax)!");
}
});
Any help would be appreciated, and if there's some more information I've missed, please let me know. Thanks in advance.
UPDATE:
I've been making some progress but don't seem to find a real solution. Now I know that the url has to be the controller, so I'm using 'components/userpost/controller.php' as it, and it reaches the ajax call, cause the success alert is showing up. The problem is the MVC way, because I send ajax to the controller, but since I don't have a reload in the page, all the includes are failing so they are obviously not being loaded, and I'm getting errors like this:
PHP Warning: include(components/userpost/model.php): failed to open
stream: No such file or directory in
/var/www/html/viewer_mvc/components/userpost/controller.php on line 3,
referer: http://localhost/viewer_mvc/index.php
Really hope you guys can show me where am I failing, and if there's a special way to do these thing in MVC.
For the JQuery call it makes a POST request to index.php?option=users with JSON data. The form with the ID userForm is serialized using the Jquery serialize method.
The .serialize() method creates a text string in standard URL-encoded notation. It can act on a jQuery object that has selected individual form controls
$.ajax({
type: 'POST',
url: 'index.php?option=users',
data: $('#userForm').serialize(),
cache: false,
dataType: 'json'
Now for your PHP sample
if ($action_user == 'show_alerts') {
$list = ModelUser::getAlertContact($act_email);
echo json_encode($list);//I predict that ajax don't reach this line, but not sure
}
This code will be looking for variables that probably don't exist anymore if it is a different file i.e. is there an $action_user variable?
To start reimplementing it you will need to add the logic so that it checks the POST variable if your not using the framework code. So if you have a form element with the name 'name' then that will be available in your PHP script POST variable
$_POST['name']
[How to call a PHP function in MVC using AJAX]
$.ajax({
type: 'POST',
url: 'save-user.php',
data: { fname: "manish", email: "manishkp#com", role:"admin"},
success: function(data) {
console.log(data);
if(data == 'error')
{
$('#Register_error').text('Must Be filled...');
$('#Register_error').show();
}
else {
$('#Register_error').hide();
$('#Register_success').text('Successfully submit');
$('#Register_success').show();
}
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<?php
$fname = $_POST['fname'];
$email = $_POST['email'];
$role = $_POST['role'];
if(!empty($fname) && !empty($email) && !empty($role))
{
#MYSQL CONNECTION QUERY #
echo"success";
}
else{
echo "error";
}
?>
I'm trying to test an ajax call on post by doing the following just for testing purposes, but for some reason the call is never successful. I've been searching around and there isn't much that I could find that would explain why this isn't working.
$.ajax({
type: "POST",
url: "file.php",
success: function(data) {
if(data == 'true'){
alert("success!");
}
},
error: function(data) {
alert("Error!");
}});
file.php contains the following:
<?php
return true;
?>
Can someone please point me in the right direction. I realize that this may seem simple but I am stumped. Thank.
return true will make the script exit. You need:
echo 'true';
Firstly check your paths. Is file.php residing in the same folder as the file that your javascript is contained in?
If your path is incorrect, you will get a 404 error printed to your javascript console if you are using chrome.
Also you should change your php to:
<?php
echo 'true';
Once your path is correct and your php is amended you should be good to go.
Have you tried by accessing to the file directly and see if it outputs something?
return true shouldn't be use in that case (or any other, it's better to use exit or die), everything get by a AJAX call is hypertext generated by server side, you should use (as they pointed you before echo 'true';)
You could also try a traditional AJAX call XMLHttpRequest (without JQuery) if problem persists, and then check if there is any problem between the request and server..
EDIT: also, do not check by comparison, just make an alert to 'data' to see what it gets.
In addition to the echo 'true' suggestion, you can also try to alert the actual data that's returned to ajax. That way you can see if you have the proper value/type for your if statement.
success: function(data) {
alert(data);
}
try this, the new ajax syntax
$.ajax({ type: "POST", url: "file.php" }).done(function(resp){
alert(resp);
});
Here is correct way:
$.ajax({
type : "POST",
url : "file.php",
success : function (data) {
/* first thing, check your response length. If you are matching string
if you are using echo 'true'; then it will return 6 length,
Because '' or "" also considering as response. Always use trim function
before using string match.
*/
alert(data.length);
// trim white space from response
if ($.trim(data) == 'true') {
// now it's working :)
alert("success!");
}
},
error : function (data) {
alert("Error!");
}
});
PHP Code:
<?php
echo 'true';
// Not return true, Because ajax return visible things.
// if you will try to echo true; then it will convert client side as '1'
// then you have to match data == 1
?>
I have the following code making a GET request on a URL:
$('#searchButton').click(function() {
$('#inquiry').load('/portal/?f=searchBilling&pid=' + $('#query').val());
});
But the returned result is not always reflected. For example, I made a change in the response that spit out a stack trace but the stack trace did not appear when I clicked on the search button. I looked at the underlying PHP code that controls the ajax response and it had the correct code and visiting the page directly showed the correct result but the output returned by .load was old.
If I close the browser and reopen it it works once and then starts to return the stale information. Can I control this by jQuery or do I need to have my PHP script output headers to control caching?
You have to use a more complex function like $.ajax() if you want to control caching on a per-request basis. Or, if you just want to turn it off for everything, put this at the top of your script:
$.ajaxSetup ({
// Disable caching of AJAX responses
cache: false
});
Here is an example of how to control caching on a per-request basis
$.ajax({
url: "/YourController",
cache: false,
dataType: "html",
success: function(data) {
$("#content").html(data);
}
});
One way is to add a unique number to the end of the url:
$('#inquiry').load('/portal/?f=searchBilling&pid=' + $('#query').val()+'&uid='+uniqueId());
Where you write uniqueId() to return something different each time it's called.
Another approach to put the below line only when require to get data from server,Append the below line along with your ajax url.
'?_='+Math.round(Math.random()*10000)
/**
* Use this function as jQuery "load" to disable request caching in IE
* Example: $('selector').loadWithoutCache('url', function(){ //success function callback... });
**/
$.fn.loadWithoutCache = function (){
var elem = $(this);
var func = arguments[1];
$.ajax({
url: arguments[0],
cache: false,
dataType: "html",
success: function(data, textStatus, XMLHttpRequest) {
elem.html(data);
if(func != undefined){
func(data, textStatus, XMLHttpRequest);
}
}
});
return elem;
}
Sasha is good idea, i use a mix.
I create a function
LoadWithoutCache: function (url, source) {
$.ajax({
url: url,
cache: false,
dataType: "html",
success: function (data) {
$("#" + source).html(data);
return false;
}
});
}
And invoke for diferents parts of my page for example on init:
Init: function (actionUrl1, actionUrl2, actionUrl3) {
var ExampleJS= {
Init: function (actionUrl1, actionUrl2, actionUrl3) ExampleJS.LoadWithoutCache(actionUrl1, "div1");
ExampleJS.LoadWithoutCache(actionUrl2, "div2");
ExampleJS.LoadWithoutCache(actionUrl3, "div3");
}
},
This is of particular annoyance in IE. Basically you have to send 'no-cache' HTTP headers back with your response from the server.
For PHP, add this line to your script which serves the information you want:
header("cache-control: no-cache");
or, add a unique variable to the query string:
"/portal/?f=searchBilling&x=" + (new Date()).getTime()
If you want to stick with Jquery's .load() method, add something unique to the URL like a JavaScript timestamp. "+new Date().getTime()". Notice I had to add an "&time=" so it does not alter your pid variable.
$('#searchButton').click(function() {
$('#inquiry').load('/portal/?f=searchBilling&pid=' + $('#query').val()+'&time='+new Date().getTime());
});
Do NOT use timestamp to make an unique URL as for every page you visit is cached in DOM by jquery mobile and you soon run into trouble of running out of memory on mobiles.
$jqm(document).bind('pagebeforeload', function(event, data) {
var url = data.url;
var savePageInDOM = true;
if (url.toLowerCase().indexOf("vacancies") >= 0) {
savePageInDOM = false;
}
$jqm.mobile.cache = savePageInDOM;
})
This code activates before page is loaded, you can use url.indexOf() to determine if the URL is the one you want to cache or not and set the cache parameter accordingly.
Do not use window.location = ""; to change URL otherwise you will navigate to the address and pagebeforeload will not fire. In order to get around this problem simply use window.location.hash = "";
You can replace the jquery load function with a version that has cache set to false.
(function($) {
var _load = jQuery.fn.load;
$.fn.load = function(url, params, callback) {
if ( typeof url !== "string" && _load ) {
return _load.apply( this, arguments );
}
var selector, type, response,
self = this,
off = url.indexOf(" ");
if (off > -1) {
selector = stripAndCollapse(url.slice(off));
url = url.slice(0, off);
}
// If it's a function
if (jQuery.isFunction(params)) {
// We assume that it's the callback
callback = params;
params = undefined;
// Otherwise, build a param string
} else if (params && typeof params === "object") {
type = "POST";
}
// If we have elements to modify, make the request
if (self.length > 0) {
jQuery.ajax({
url: url,
// If "type" variable is undefined, then "GET" method will be used.
// Make value of this field explicit since
// user can override it through ajaxSetup method
type: type || "GET",
dataType: "html",
cache: false,
data: params
}).done(function(responseText) {
// Save response for use in complete callback
response = arguments;
self.html(selector ?
// If a selector was specified, locate the right elements in a dummy div
// Exclude scripts to avoid IE 'Permission Denied' errors
jQuery("<div>").append(jQuery.parseHTML(responseText)).find(selector) :
// Otherwise use the full result
responseText);
// If the request succeeds, this function gets "data", "status", "jqXHR"
// but they are ignored because response was set above.
// If it fails, this function gets "jqXHR", "status", "error"
}).always(callback && function(jqXHR, status) {
self.each(function() {
callback.apply(this, response || [jqXHR.responseText, status, jqXHR]);
});
});
}
return this;
}
})(jQuery);
Place this somewhere global where it will run after jquery loads and you should be all set. Your existing load code will no longer be cached.
Try this:
$("#Search_Result").load("AJAX-Search.aspx?q=" + $("#q").val() + "&rnd=" + String((new Date()).getTime()).replace(/\D/gi, ''));
It works fine when i used it.
I noticed that if some servers (like Apache2) are not configured to specifically allow or deny any "caching", then the server may by default send a "cached" response, even if you set the HTTP headers to "no-cache". So make sure that your server is not "caching" anything before it sents a response:
In the case of Apache2 you have to
1) edit the "disk_cache.conf" file - to disable cache add "CacheDisable /local_files" directive
2) load mod_cache modules (On Ubuntu "sudo a2enmod cache" and "sudo a2enmod disk_cache")
3) restart the Apache2 (Ubuntu "sudo service apache2 restart");
This should do the trick disabling cache on the servers side.
Cheers! :)
This code may help you
var sr = $("#Search Result");
sr.load("AJAX-Search.aspx?q=" + $("#q")
.val() + "&rnd=" + String((new Date).getTime())
.replace(/\D/gi, ""));
I need to load only new data into my div with ajax. At the moment I'm currently loading all data, because if I delete a record in the database it also removes it from my chat div.
Here is my js code:
var chat = {}
chat.fetchMessages = function () {
$.ajax({
url: '/ajax/client.php',
type: 'post',
data: { method: 'fetch', thread: thread},
success: function(data) {
$('.chat_window').html(data);
}
});
}
chat.throwMessage = function (message) {
if ($.trim(message).length != 0) {
$.ajax({
url: '/ajax/client.php',
type: 'post',
data: { method: 'throw', message: message, thread: thread},
success: function(data) {
chat.fetchMessages();
chat.entry.val('');
}
});
}
}
chat.entry = $('.entry');
chat.entry.bind('keydown', function(e) {
if(e.keyCode == 13) {
if($(this).val() == ''){
} else {
chat.throwMessage($(this).val());
e.preventDefault();
}
}
});
chat.interval = setInterval(chat.fetchMessages, 8000);
chat.fetchMessages();
I have had a look around and some say that if you pass a timestamp to the server and load new content that way, but I can't seem to get my head around that. If you need php let me know.
Right, so the timestamp thing makes the most sense. You'll need to do a few things:
On the back end, you need to make client.php accept a timestamp parameter in the querystring. When returning data, instead of just returning all of it, make it return everything since the time stamp, if given. Otherwise return everything.
The very first time you load the chat client, the first thing you should do is make an Ajax call to a new PHP file that returns the current server timestamp. Store the value of that in a Javascript variable as a Number.
During chat.fetchMessages(), increment the value of the timestamp variable by however long it's been since the last fetch (looks like 8000 milliseconds), and feed that to client.php, like url: '/ajax/client.php?timestamp=' + latestFetchTimestamp,
Instead of replacing all HTML content, append instead.