I am trying to crawl my GWT app with HTMLUnit, but for a certain page the desired content is not returned. The GWT page contains a dynamically added javascript which makes a jsonp request to a gae server. I already debugged the server code, and the breakpoint is hit, but at this time the htmlunit code is already finished and the returned content is not complete.
I almost tried all suggested solutions available in stackoverflow, but without any success.
Here is the jsonp request.
http://30.tripstorekrabi.appspot.com/activity?&callback=__gwt_jsonp__.P0.onSuccess
On other pages I use exactly the same kind of call, and there it works fine.
Can anyone help me?
I found a workaround in my GWT code:
Now the jsonp request is executed in a deferred scheduled command:
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
#Override
public void execute() {
activityRegistry.loadActivities(new AsyncCallback<Result>() {
}
Now the javascript function is processed from htmlunit and the desired content is showed.
Related
I have this simple page that just needs to show contents that is loaded from an external url (ajax request, response in json format)
I should say I'm a AngularJS newbie.
I've googled a bunch and found different ways of doing this and couldn't manage to determine which is the correct/simple/up-to-date way to achieve this.
My 2 challenges -
Making the AJAX request run on startup (I can load the page before that happens and just load the contents one the ajax request finishes. Maybe show a 'Loading..' indicator)
Doing a ajax request correctly.
Here is my attempt. I know that the ajax request is never made because its not setup correctly.
You are getting into .error function:
http://jsbin.com/oDUsuVA/3/edit
For jsonp your response should be something like:
callback([
{
"title":"License Title 1",
"licenseUrl":"http://cnn.com",
"licenseText": " test"
}]);
Edit:
You can simply do .get() request too, but if you had to use jsonp request interface, you would have to correct response.
A Jsonp request always wraps the logic into a json callback wrapper function.
I just did $http.get instead of your $http.jsonp and it did work for me.
I have a question about AJAX.. I am using AJAX for my javascript in calling php file,
how ever I noticed that when I run the program in IE callback comes in twice which
gives me more results than expected while callback comes in in firefox only once..
I want to have just the one reply from callback..
this.doPost = function(param) {
/// make a HTTP POST request to the URL synchronously
req.open("POST",url, true);
...
this is the call..
Do you know what is wrong?
Thanks.
Depending on how you actually perform the AJAX call and what you do in the callback, you can run into issues - see for example this thread for similar issues:
How to execute a page ,that contains JS ,in AJAX ,using innerHTML?
I suggest you try some proven library instead of using AJAX on the low level. For example, using jQuery you can use $.ajax, see e.g. the examples in jQuery documentation:
http://api.jquery.com/jQuery.ajax/
or some of many other examples you can find on the Net, such as this:
http://net.tutsplus.com/tutorials/javascript-ajax/5-ways-to-make-ajax-calls-with-jquery/
Here is my situation:
Im creating a widget that site admins can embed in their site and the data are stored in my server. So the script basically has to make an ajax request to a php file in my server to update the database. Right? Right :)
The ajax request works excellent when i run it in my local server but it does not work when the php file is on my ONLINE server.
This is the code im using:
var url = "http://www.mydomain.net/ajax_php.php";
var params = "com=ins&id=1&mail=mymail#site.net";
http.async = true;
http.open("POST", url, true);
http.onreadystatechange = function() {
if(http.readyState == 4 && http.status == 200) {
//do my things here
alert( http.responseText );
}
}
http.send(params);
In firebug it shows: http://www.mydomain.net/ajax_php.php 200 OK X 600ms.
When i check the ajax responnseText I always get a Status:0
Now my question is: "Can i do cross-domain ajax requests by default? Might this be a cross-domain ajax problem? Since it works when the requested file resides in my local server but DOESN'T work when the requested file is in another server, im thinking ajax requests to another remote server might be denied? Can you help me clear on this?
Thanks..
Cross-domain requests are not directly allowed. However, there is a commonly-used technique called JSONP that will allow you to avoid this restriction through the use of script tags. Basically, you create a callback function with a known name:
function receiveData(data) {
// ...
}
And then your server wraps JSON data in a function call, like this:
receiveData({"the": "data"});
And you "call" the cross-domain server by adding a script tag to your page. jQuery elegantly wraps all of this up in its ajax function.
Another technique that I've had to use at times is cross-document communication through iframes. You can have one window talk to another, even cross-domain, in a restricted manner through postMessage. Note that only recent browsers have this functionality, so that option is not viable in all cases without resorting to hackery.
You're going to need to have your response sent back to your client via a JSONP call.
What you'll need to do is to have your request for data wrapped in a script tag. Your server will respond with your data wrapped in a function call. By downloading the script as an external resource, your browser will execute the script (just like adding a reference to an external JS file like jQuery) and pass the data to a known JS method. Your JS method will then take the data and do whatever you need to do with it.
Lots of steps involved. Using a library like jQuery provides a lot of support for this.
Hope this helps.
I'm using mvc-mini-profiler along with Glimpse. The problem is glimse is flooding the profiler output with glimpse requests. Is there any way to ignore all request made by glimpse ?
protected void Application_Start()
{
var ignored = MiniProfiler.Settings.IgnoredPaths.ToList();
ignored.Add("Glimpse.axd");
MiniProfiler.Settings.IgnoredPaths = ignored.ToArray();
}
Solution Posted here:
Mini MVC profiler: appears to be displaying profile times for every static resource
At the moment Glimpse will make Ajax requests if you have the Remote tab selected or when ever an Ajax request is made by your site.
This is done because when we detect that a request is made we proactively get the Glimpse data. We could probably switch this in a future release to be more lazy and only fetch the data on request.
Note, even though this will help, Glimpse will still be calling back to the server in the same way that Mini Profile does. Hence, both frameworks could probably try and ignore each other for ajax requests.
Hope this helps.
I am getting this Error
NETWORK_ERROR: XMLHttpRequest Exception 101
when trying to get XML content from one site.
Here is my code:
var xmlhttp;
if(window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
if (xmlhttp==null) {
alert ("Your browser does not support XMLHTTP!");
return;
}
xmlhttp.onReadyStateChange=function() {
if(xmlhttp.readyState==4) {
var value =xmlhttp.responseXML;
alert(value);
}
}
xmlhttp.open("GET",url,false);
xmlhttp.send();
//alert(xmlhttp.responseXML);
}
xmlhttp.open("GET",url,false);
xmlhttp.send(null);
Does any one have a solution?
If the url you provide is located externally to your server, and the server has not allowed you to send requests, you have permission problems. You cannot access data from another server with a XMLHttpRequest, without the server explicitly allowing you to do so.
Update: Realizing this is now visible as an answer on Google, I tried to find some documentation on this error. That was surprisingly hard.
This article though, has some background info and steps to resolve. Specifically, it mentions this error here:
As long as the server is configured to allow requests from your web application's origin, XMLHttpRequest will work. Otherwise, an INVALID_ACCESS_ERR exception is thrown
An interpretation of INVALID_ACCESS_ERR seems to be what we're looking at here.
To solve this, the server that receives the request, must be configured to allow the origin. This is described in more details at Mozilla.
The restriction that you cannot access data from another server with a XMLHttpRequest can apply even if the url just implies a remote server.
So:
url = "http://www.myserver.com/webpage.html"
may fail,
but:
url = "/webpage.html"
succeed - even if the request is being made from www.myserver.com
Request aborted because it was cached or previously requested? It seems the XMLHttpRequest Exception 101 error can be thrown for several reasons. I've found that it occurs when I send an XMLHttpRequest with the same URL more than one time. (Changing the URL by appending a cache defeating nonsense string to the end of the URL allows the request to be repeated. -- I wasn't intending to repeat the request, but events in the program caused it to happen and resulted in this exception).
Not returning the correct responseText or responseXML in the event of a repeated request is a bug (probably webKit).
When this exception occurred, I did get an onload event with readyState==4 and the request object state=0 and responseText=="" and responseXML==null. This was a cross domain request, which the server permits.
This was on an Android 2.3.5 system which uses webKit/533.1
Anyone have documentation on what the exception is supposed to mean?
Something like this happened with me when I returned incorrect XML (I put an attribute in the root node). In case this helps anyone.
xmlhttp.open("GET",url, true);
set the async part to true
I found a very nice article with 2 diferent solutions.
The first one implementing jQuery and JSONP, explaining how simple it is.
The second approach, it's redirecting trough a PHP call. Very simple and very nice.
http://mayten.com.ar/blog/42-ajax-cross-domain
Another modern method of solving this problem is Cross Origin Ressource Sharing.
HTML5 offers this feature. You can "wrap" your XMLhttp request in this CORS_request and
if the target browser supports this feature, you can use it and wont have no problems.
EDIT:
Additionaly i have to add that there are many reasons which can cause this Issue.
Not only a Cross Domain Restriction but also simply wrong Settings in your WEB.CONFIG of your Webservice.
Example IIS(.NET):
To enable HTTP access from external sources ( in my case a compiled Phonegap app with CORS request ) you have to add this to your WEB.CONFIG
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
Another scenario:
I got two webservices running... One on Port 80 and one on Port 90. This also gave me an XML HTTP Request Error. I even dont know why :). Nevertheless i think this can help many not well experienced readers.