I have an HTML file referencing a PHP script to perform various functions. One of the ways the HTML file calls the PHP script is through an HTTP GET. The GET request should pass three parameters and return a list of all saved events as a JSON-encoded response.
So far, I have the following but I'm not sure how to pass the three arguments through the HTTP GET. Also, I'm not sure if I am returning the JSON-encoded response correctly:
if($_SERVER['REQUEST_METHOD'] == 'GET'){
echo json_encode(events.json); }
GET requests are done through the URL... So if you want to pass three GET requests you would do...
http://www.domain.com/target.php?param1=whatever¶m2=whatever¶m3=whatever
target.php represents the PHP script file you want to send the information to. You can have as many variables as you want but just keep in mind that every other GET request has to be separated by an & symbol. The first param simply has to be started off with a ? symbol.
If you want to use Javascript, I would recommend using JQuery. You can do something like this
$.get('target.php?param1='+whatever+'¶m2='+whatever2, function(data) {
alert(data);
});
Or you can use window.location to send a link with the appropriate link above.
If you want to use AJAX specifically, here is a way of doing it with JQuery (there are ways with Javascript that I could update later if necessary:
$.ajax({
type: "GET",
url: "http://www.domain.com/target.php",
data: { param1 : "whatever", param2 : "whatever", param3 : "whatever" },
success: function(result){
//do something with result
}
})
If you want to access the variables, you can call $_GET['param1'] or $_REQUEST['param1'] to get access to them in PHP. Simply change the name in the brackets to the desired variable you want and store it in a variable.
If you want to access the params with Javascript... well the most efficient way is to go and decode the URL that was used and pull them out. See here
Hope this helps!
You can access the parameters from the URL via the $_GET superglobal in PHP.
For example, if your URL is http://example.com/test.php?param1=foo¶m2=bar, then you could access them in PHP like so:
$param1 = $_GET['param1'];
$param2 = $_GET['param2'];
See http://www.php.net/manual/en/reserved.variables.get.php for more details.
As for returning a valid JSON response, you can check out this answer. It uses PHP's header function.
Related
I have an array in JS and I am trying to pass it as parameter to URL and catch it in PHP but I cant get to understand how to do it:
var trafficFilterHolder = ["roadworks","snow","blocking"];
var filters = encodeURI(JSON.stringify(trafficFilterHolder));
FYI: I am using windows.fetch for posting.
in PHP:
$trafficFilters = $_GET["trafficFilters"];
$obj = json_decode($trafficFilters);
var_dump($obj);
You are passing the data to php with fetch() intead of ajax, so the alternative of my first answer to do the same with the fetch() is:
var trafficFilterHolder = ["roadworks","snow","blocking"];
var trafficFilterHolderJoin = trafficFilterHolder.join(); // comma-separeted format => "roadworks,snow,blocking"
Now add the trafficFilterHolderJoin variable to the traffic query of the URL of your fetch(), like:
fetch('script.php?traffic=' + trafficFilterHolderJoin)
Then in your php script file you will convert the comma-separeted format to php array format using the explode function:
$traffic = explode(",", $_GET['traffic']);
It's quite simple, you are passing these data to php with ajax, correct?
First of all, you are creating the javascript array incorrectly:
var trafficFilterHolder = [0: "roadworks", 1: "snow", 2: "blocking"];
Don't use brackets to create arrays with keys, use this format instead:
var trafficFilterHolder = {0: "roadworks", 1: "snow", 2: "blocking"};
Now, in the ajax, just add the array in the data:
$.ajax({
data: { trafficFilters: trafficFilterHolder }
});
All demands to the server are executed as an http requests. Ther are two types of HTTP requests - GET and POST.
https://www.w3schools.com/tags/ref_httpmethods.asp
What you're describing is called GET request. With GET request the parameters are passed via the address bar. For making an http request you have two options.
The direct HTTP GET request.
For this you need simply open a new page with
window.location.href = 'http://your_site.com/file.php?name1=value1&name2=value2'
This will open a new page in your browser and pass a request with your parameters.
An Ajax HTTP GET request.
You have a lot of options here:
an old-fashion way with xmlHttpRequest object
a modern fetch API with promises
third-part libraries like jQuery.ajax etc.
AJAX request can send and receive information from the server (either in GET or POST request) without renewing the page. After that the result received can be managed with your javascript application however you want.
Hope, it makes more clear for you. You can search about all this technologies in the google. This is the way how to exchange data from front-end to back-end.
Try using ajax and pass that array and retrieve values at the PHP end.
var filters = encodeURI(JSON.stringify(trafficFilterHolder));
$.ajax({
type: "POST",
url: "test.php",
data: {data : filters},
cache: false,
success: function(){
alert("OK");
}
});
I have been trying to redirect page with variable through javascript.
I have found window.location.href = "test.php?variable=" + variabletosend;
but in this way user can change url and hence values.
Please tell me, how to pass variable to another page through javascript, hidden from user.
Your entire approach is wrong.
You can never trust a URL from a user, nor prevent the user from seeing the URL to the page.
Instead, you need to write server-side code to return an error if the user tries to access they're not supposed to.
You could do something like:
Instead of GET request, use POST (if you don't want parameters in url)
If you want to pass parameter + redirect then, it would be better if you could store those values as session variable.
If you worry about user accessing improper pages of your site you should correclry handle such requests either in server-side running code or using your web-server (IIS, Apache, etc)
You basically want to send the variable to a php page via js.I also had this kind of problems.you should use AJAX request.I know it sounds complex but after you google it this would be easy.In jquery you could use(it would be good to check for syntax error):
$(document).ready(function() {
$.ajax({
type: "POST",
url: 'test.php',
data: { variable : variable },
success: function(data)
{
alert("success!");
}
});
});
use this file."jquery.redirect.js"
$("#btn_id").click(function(){
$.redirect(http://localhost/test/test1.php,
{
user_name: "khan",
city : "Meerut",
country : "country"
});
});
see=https://github.com/mgalante/jquery.redirect
Currently I've been Ajaxing a route that renders a Twig template via a Controller and injecting it into the page - all is well.
return $this->render('MyBundle:Requests:results.html.twig', array('system' => $lc_system));
However, in my JavaScript, I would like to get some extra information returned... Specifically I want a count of the results, so I can check it against a JS variable. I could put it into the twig file and then get it in JS that way, but it feels horrible.
Is there any way to get any variables sent down with the Ajax response, or a best practice way to approach this.
Use echo in your PHP function instead of return.
$.ajax({
type: "POST",
url: "somescript.php",
datatype: "html",
data: dataString,
success: function() {
doSomething(data); //Data is output
}
});
In PHP:
<?php
$output = some_function();
echo $output;
?>
It's an argument passed to your success function.
The full signature is success(data, textStatus, XMLHttpRequest), but you can use just he first argument if it's a simple string coming back. As always, see the docs for a full explanation.
If you weren't returning actual page content in your response, I'd say to return a JSON response and call it good. But since you're already using your response body for some HTML, you have to come up with another way to return the info.
One approach I've used in the past is to add a custom HTTP header and return my "meta" values that way. First, set the header in your PHP (make sure this happens before any output):
header('X-MyCustomHeader: ' . $phpVar);
Then, you can get it in your jQuery success method like this:
success: function(result, status, xhr) {
var customHeader = xhr.getResponseHeader('X-MyCustomHeader'));
}
While you can technically name your custom header anything you want, see this post for best practice/naming convention ideas:
Custom HTTP headers : naming conventions
I'm fairly new to the jQuery execute on the same page stuff. So far I have been passing only single values trough ajax which is working fine. Now, I need to pass an array which is created by checkboxes through ajax.
My form html, dynamically created by php:
<input type=checkbox class=box name=box[] value=".$row['DoosID']." />
My jQuery:
var BackorderDate = $("#BackorderDate").val();
var Box = $(".box").val();
if( (TerugleverDatum == "") ){
$("#backorderresult").html(" * Some Error .").fadeIn("Slow").fadeOut(3000);
} else {
$("#backorderresult").fadeOut();
$.ajax({
type :'POST',
url :'./backorder.php',
data : box : Box,
backorderdate: BackorderDate,
dataType:"json",
success: function(data){
// Do Something
}
});
}
My PHP:
$boxlist = json_encode($box);
foreach($boxlist as $boxvalue){
// Do something with every value
}
this gives me a javascript error on submit saying box is not defined.
change this:
data : box : Box, backorderdate: BackorderDate, // invalid way of sending
to this:
data : {box : Box, backorderdate: BackorderDate}, // valid way
data
Type: PlainObject or String
Data to be sent to the server. It is converted to a query string, if not already a string. It's appended to the url for GET-requests. See processData option to prevent this automatic processing. Object must be Key/Value pairs.
More Info
Why don't you try enclosing all the data values in a open and close curly braze( { and } ) .
Else it will conflict with the syntax of $.ajax method.
I think it is causing the problem.
You are sending data value in wrongly manner -
The data property should always be a JavaScript object. It's properties are serialized into a regular query string (for GET requests), or a normal post body parameter string (for POST requests). This serialized string is then sent to the server, along with the AJAX request.
On the server you can read the properties of the data object as if they were sent as simple request parameters, via either GET or POST. Just like if the properties had been fields in a form.
Try this :
$.ajax({
type :'POST',
url :'./backorder.php',
data : 'box='+Box+'&backorderdate='+BackorderDate,
dataType:"json",
success: function(data){
// Do Something
}
});
For more information see jQuery Ajax
You might want to refer to the php file like this: url :'../backorder.php' (double dots). At least, that's how I do it always.
I am parsing generated json with jquery $.ajax but there is one option that I dont understand. I saw it in some examples and tried to look for at jquery.com but still not sure about it:
this option is:
data: { get_param: 'value' }
which is used like this:
$.ajax({
type: 'GET',
url: 'http://example/functions.php',
data: { get_param: 'value' }, //why we shell use that in that case?
success: function (data) {
var names = data
$('#cand').html(data);
}
});
I know that "data:" is what sent to the server but parsing JSON I thought i don't send but retrieve from server with GET type. And the next part "get_param: 'value'"
does not make sense to me in that case either, could anyone please explain when and what for and in what cases it shell be used?
thank you.
I know that "data" is what sent to the server
Yes. If data is an object, it gets serialized to an application/x-www-form-urlencoded string and then placed in the query string or request body as appropriate for the request type (GET/POST).
jQuery does all the escaping necessary for this.
(It also, by default, collapses nested data structures (you don't have any in your example) into PHP-style by adding [] to key names).
but parsing JSON
JSON is not involved (unless the server responds with some).
when and what for and in what cases it shell be used
Whenever you want to pass data to the server rather than requesting a static URI.
You don't send JSON (usually), you send simple GET or POST HTTP parameters. They are given to the ajax method in an object literal usually, but you could have used the string "getparam=value", too. If you provide an object, jQuery will do the parameter-serialisation and URL-encoding for you - they're sent as x-www-form-urlencoded.
To cite from the docs:
data (Object, String)
Data to be sent to the server. It is converted to a query string, if
not already a string. It's appended to the url for GET-requests. See
processData option to prevent this automatic processing. Object must
be Key/Value pairs. If value is an Array, jQuery serializes multiple
values with same key based on the value of the traditional setting.