if(window.XMLHttpRequest) {
request = new XMLHttpRequest();
} else {
request = new ActiveXObject("Microsoft.XMLHTTP");
}
request.open('GET', 'foo.php?bar=' + baz, true);
request.send()
I know that this can be done with PHP, but I'd like to know if/how it can be done with aspx (i.e. request.open('GET', 'foo.aspx?bar=' + baz, true);). In the example above, the AJAX call is being made in javascript from a plain old HTML page (not PHP), but it can interact with PHP.
Can the same thing be done with aspx? If so, do I need to target the code behind file or not? Say that the aspx is only there to respond to requests like this, is there something to put in the aspx file that automatically passes the GET to the vb/cs file?
Any help would be appreciated. I'm just more accustomed to working with PHP, but my current job is primarily a VB shop, so PHP comparisons are welcomed. Thanks.
Aspx was not meant to work this way.
You will need to catch the ajax call on the Load event of the page, and then Response.Write whatever you want to return as a string. Then you have to set the Response.ContentType and then you need to end it with Response.End.
It is complicated and a bit of a hack.
Your best option is to start learning asp net mvc which will most likely work similarly to any php mvc framework.
Ajax just means "Making an HTTP request from JavaScript without leaving the page".
There is nothing special about the HTTP request.
The server can generate the response in any way you like. Static files, Perl, JavaScript (via Node), PHP, ASP.NET, any way you like.
Related
How do I receive a string in JS (maybe through an alert) without the user being able to see it beforehand (e.g. in the source code)?
You probably know this from Geocaching Checkers, how do they secure the real Coordinates from being seen in the source code or wherever?
I have a web server and some basic JS and HTML understanding, I read about PHP and AJAX but I didn't found the solution to my problem yet.
My objective is to reveal a information only if the user completed a condition on my website, and its vital that it's not seen before.
I tried using a separate PHP file:
<?php
$koords = "N 53° 13.869 E 10° 22.716";
?>
but how do i reciev this variable in JS and can the php file be seen by the user?
In your browser (JS) it will always be available to be seen by someone with JS knowledge.
The only thing you can do is set up a server which evaluates if your user has fulfilled the condition for completing the challenge. Once the server recognizes the challenge as completed it would send back your secret to the client, so that it can be displayed to the user there. How you set up that server and with what language or framework /tools (for example PHP) depends on your background and the environment you will host your website in.
Adding a bit of detail: You will want to make a Http request in your JS somehow sending user input to the server (for example PHP). If it is simple content you could add it in the url itself with ¶meter=foo, otherwise you would likely send a post request and send your data as JSON body. You would then need to evaluate the parameter in your PHP and if it meets the challenge's requirement you would answer to the client in your response with your secret or if not with a message like try again.
Ok, here is what I did, to help anyone who sees this.
The method is easy to "hack" so don't use this to hide actual sensible data, its more an obstruction to easily see in the sourcecode whats going on.
I created a PHP looking like this
<?php
$secret = "data";
$givesecret = $_GET['givesecret'];
if ($givesecret>0) {
echo $secret;
}
?>
Then, when I want the secret Information I let my JS call the PHP via XHR
var rndvar = 0;
//something is done in a loop
rndvar++;
//now something is completed and i want to reveal the secret
var xhr = new XMLHttpRequest();
xhr.open("GET", "containssecret.php?givesecret="+rndvar);
xhr.onreadystatechange = function()
{
if(xhr.readyState == 4 && xhr.status == 200) {
alert(xhr.responseText);
}
}
xhr.send();
Pretty basic, and the obvious flaw is, of course, I could call https://www.mywebsite.org/containssecret.php?givesecret=5 and it will give the secret right away, so the goal would be to name everything less obvious and don't make it clear what the criteria in the PHP is (here it is int greater then zero).
But it will always be possible to find that out if you know some coding, this is just an easy way to obfuscate and it's only relatively secure from the ordinary users. For my purpose this is well enough :-D
So I created a server application using Java and wildfly that have multiple rest webservices. This webservice return xml and are working. This was the easy part, but now I have to make an application that is going to use the web services. This application is not a website and I have problems calling the web services. I tried
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "url, false);
xhttp.send();
This url is a valid url. When I try to run the code that call this javascrip I got the following error.
XMLHttpRequest' is undefined
At first i thought tha was some missing library (i am realy new to javascript), but when I google it, I understood that this method is only usable when it runs in a web page.
I don't want the code to do this I only want to know if there is a method I can use to call a rest web service and get the xml result. If possible a method native to javascrip (not using query or others) and that can be used in a aplication and not a web site.
Thank you for your help.
I need to use JavaScript to send data to be stored in a database. Having looked around on-line I think the best way was to use a xmlhttp request to send data to an asp file.
Below is the script I've got to send to 'Receiver.asp'.
Searching the web hasn't helped me uncover the code I need in Receiver.asp.
function postToASP(name, time) {
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
var UrlToSend = "Receiver.asp?" +"n=" + name + "t=" + time ;
xmlhttp.open("GET", UrlToSend, false);
xmlhttp.send();
}
Thanks for any help.
Some additional info if needed:
the majority of my code is written in processing
the above js script and the .asp file will be stored in same folder as sketch
eventually i intend to run on a xampp server
First of all, I'm assuming that that's supposed to be client side JavaScript and that it works.
You say you want to use XAMPP. Forget it. Classic ASP is proprietary Microsoft technology which will only run on IIS.
What Receiver.asp has to do is quite simple. First it has to use the request object to retrieve the data it has been sent. (I'm using VBScript as my scripting language because it's what I'm used to, you can use Javascript if you prefer
dim time, name
time = Request.Querystring("t")
name = Request.Querystring("n")
If you were using the post method then you would use Request.Form() Alternatively Request() works for both get and post methods.
Then it's a standard database insert. It doesn't matter if the data is sent in a querystring, in an html form or by an ajax call, the server side code is pretty much the same. Here's a simple tutorial, you should find plenty more if you google
http://www.codefixer.com/tutorials/form_to_database.asp
You haven't said what sort of database you want to write to. You'll need the relevant connection string. Here's a very useful resource with an easy to remember url.
http://www.connectionstrings.com/
Alright so basically I have a flash login, which I handled to work with JS using ExternalInterface. I want the php to load only when the user has logged in, how is it possible to do this without sending a new postback (reloading the page)?
What I basically want is: the JS already appears once the user has logged in. I want it once clicked to execute a MySql query, get the data and show the user without reloading the page.
I know that's AJAX but I really don't know how to do it - I'm not familiar with php, I also don't know how I can run the php when a function is called in JS.
Best regards,
iMix
You can use jquery, it would be a quick and practical solution.
function login(){
$.ajax({
type: "POST",
url: "your_login_script.php",
data: { username: "thatuser", password: "thatpwd" }
}).done(function( result ) {
alert(result);
});
}
You'll want to make an XMLHttpRequest to another php file which returns the data. Then, with JS, parse the data from whatever format you returned it in (I recommend JSON), and update the HTML.
Since you'll want the data only to be returned if the user is logged in, you probably want to send the username/password over an encrypted connection, in the body of a post request, then check in the php file if they're valid.
Yes, you need to use AJAX.
Here is an outline of the simplest procedure:
Send a request to the server to run the PHP script in the background, without reloading the current web page.
The PHP script will do the required query and format the result as HTML. It should not generate a whole page ... just a DIV or a TABLE tag with the data you want.
Your Javascript will receive the HTML fragment and insert it into the current page.
Here is the barest, most essential code to get the job done.
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("targetDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET", "somescript.php", true);
xmlhttp.send();
You should read up some on AJAX if you're going to put anything into public production. I also highly recommend using jQuery or one of the other Javascript libraries. They have much better abstractions for this kind of thing than anything you're likely to cook up yourself.
Hi
I am writing an application where I want to post data after clicking send button, it will post data to some web-action and gets processed, after processing it will be redirected to some other jsp page but I want to be in the same page from where I click send button. I am not sure of XMLHttpRequest method.
Any ideas to get this done highly appreciated.
If you wanna do using Java script and Ajax (As you have in your question tags) then Try following:
function fun() {
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
var url = "Serv?req_id=1";
xmlhttp.open("POST", url, false);
xmlhttp.send(null);
var respo= xmlhttp.responseText;
document.getElementById("some_id").innerHTML = xmlhttp.responseText;
}
Call fun() on onclick event of send button.
Hope this helps.
You can use jQuery.ajax() - it's a convenient wrapper for XMLHttpRequest.
You can use jQuery. It will save some time. It is cross browser compatible (i.e. hides the cross browser compatibility techniques from you).
http://api.jquery.com/jQuery.post/
http://jquery.com/
You can issue a 302 request back to the page you came from as the response from the POST request. If you don't want to POST at all I can show you how to do this through AJAX.
The reason you want to use the GET->POST->GET is so that if the user hits the back button it doesn't re-post on you.
Here's a great beginner's tutorial on what you're looking to do (with jQuery):
http://net.tutsplus.com/tutorials/javascript-ajax/submit-a-form-without-page-refresh-using-jquery/
A 302 request back approach seems to be good for this, If you were using ajax or XMLHttpRequest object, it wouldn't be that problem, but here you can set redirection header to redirect back on the same script that process your query-string.
However you cannot do post without a redirection.
Passing values from one jsp page to another jsp page
I know this is a bit late but for the sake of sharing knowledge, I found a good article here: http://net.tutsplus.com/tutorials/javascript-ajax/submit-a-form-without-page-refresh-using-jquery/
On it, is a very thorough example of how to do what you are asking for.
This is done, as mentioned above, with AJAX/jQuery, this tutorial makes use of that.