I create a new model (msg) and save it like below:
msg.save({}, {success: this.createSuccess, error: function(model, response){
console.log('nay', response);
}});
Now the server returns status: 200 and statusText: "OK" but still the error callback is called.
The model has no validation nor does the server (Express.js).
What could I've overlooked?
I'm using the latest version of Backbone and Express…
Are you returning anything in your body? If all you are returning is 200 OK in the head, then you will get an error. You should return the JSON representation of the saved item (including the id, which is really important for updates/deletes later) from your server.
If you want to return an empty response, the response code should be 204 No Content. See https://stackoverflow.com/a/9104241/157943.
Related
I intend to send my server response in the following format
Api Doc
I did the following
headersR.add("response_code", "OK");
headersR.add("cmd_code", "SET_FK_NAME");
headersR.add("trans_id", Long.toString(System.currentTimeMillis()/1000000));
JSONPObject map1 = new JSONPObject("fk_name", "jj");
return new ResponseEntity<>(map1, headersR, HttpStatus.OK);
I was getting a negative response from the other side so I checked Wireshark(Had a hard time logging my response body). And I got this in Wireshark.
Wirehark Screenshot
The response body is Definitely not JSON.
How can I fix this?
The response body fk_name("jj") is not JSON, it's JSONP -- Browser would take the function name fk_name and try to execute it with "jj" as parameter.
The root cause is you are using JSONPObject, whose constructor accepts 2 parameters: a function name, and the data value. Not the expected JSON key and value.
To fix this issue and return {"fk_name":"jj"}, remove the JSONPObject stuff and use code as follow:
return new ResponseEntity<>("{\"fk_name\":\"jj\"}", headersR, HttpStatus.OK);
I'm using Datatables 1.10.5 and I have the ajax error handler defined. I need to gain access to the actual http status code when the error fires so I can see if my user's session time has expired (HTTP 401) vs if there's something wrong on the backend such as an HTTP 500 error. Right now the techNote is always 7.
How can I get that elusive HTTP status code from the ajax transaction? I tried below, but it does not fire.
$("#example").ajaxError(function(event, jqxhr, request, settings){
alert("Failure HTTP Code:"+jqxhr.status);
});
and
$.fn.dataTable.ext.errMode = 'throw';
$('#example').on('error.dt', function(e, settings, techNote, message) {
console.log( 'An error has been reported by DataTables: ', message);
});
Does not have the information I need, or at least that I cannot find it in any of the passed variables.
I've been able to get access to the status code without overriding global jQuery ajaxError by overriding the more specific to DataTables $.fn.dataTable.ext.errMode with a function:
$.fn.dataTable.ext.errMode = function (settings, tn, msg) {
if (settings && settings.jqXHR && settings.jqXHR.status == 401) {
window.location = window.location.origin + '/login';
return
}
alert(msg) // Alert for all other error types; default DataTables behavior
};
This example shows a redirect to login on 401 status code, however, you could do the same with any other status code.
Last note is you might want to leverage the DataTables statusCode option for status code specific handling but you'll still need to override $.fn.dataTable.ext.errMode if you want to bypass default error handling since it executes before anything you define in statusCode
Handle xhr event. When Ajax error occurs third argument json would be null and fourth argument xhr would contain jQuery XHR object. You can get the status by accessing xhr.status property.
Also see $.fn.dataTable.ext.errMode which could be used to instruct DataTables not to show the alert.
I am using CakePHP 2.4.
I want my frontend make api calls to my CakePHP backend using ajax.
Suppose this is to change passwords.
Change password action can throw the following application errors:
old password wrong
new password and confirm new passwords do not match
In my frontend, I have a success callback handler and a error callback handler.
The error callback handler handles all the non 200 request calls such as when I throw NotFoundException or UnAuthorizedAccessException in my action.
The success callback handler handles all the 200 request calls including of course, the above 2 scenarios.
My questions are:
Should I continue to do it this way? Meaning to say, inside all success callback handler, I need to watch out for application success and application error scenarios.
Should I send application errors back with actual HTTP error codes?
if I should do 2, how do I implement this in CakePHP?
Thank you.
Don't use http error codes for system errors like:
old password wrong
new password and confirm new passwords do not match
etc etc...
Now using success handler you can show messages and code flow as:
Create Ajax post or get to submit the form, I am showing you post example
var passwordValue = $('#password').val();
$.post( "/updatePassword", { passwordText: passwordValue })
.done(function(response) {
if(response.status === 'Success'){
// Success msg
// whatever
}else{
// Error msg
// whatever
}
});
json response would like:
{
"status": "Failed/Success",
"message": "old password wrong."
}
Create one function in controller
public function updatePassword() {
$myModel = $this->MyModel->find('first' // YOUR CODE LOGIC);
if($this->request->is('ajax') {
$this->layout=null;
// What else?
echo json_encode($myModel);
exit;
// What else?
}
}
Do something like this, hope it will solve your query!
Not sure if SFDebug is any help in this situation. I am making an ajax post using jQuery. Which retrieves JSON data in my action URL and then makes a call to the Model method that executes the action. The part until my action URL, and the jQuery call to it work fine. With the data transmitted from the client to the server well received and no errors being made.
It is the part where it calls the method on the Model that is failing. My jQuery method looks like this:
$.post(url, jsonData, function(servermsg) { console.log(servermsg); }) ;
My server action is like this
public function executeMyAjaxRequest(sfWebRequest $request)
{
if($request->isXmlHttpRequest())
{
// process whatever
$servermsg = Doctrine_Core::getTable('table')->addDataToTable($dataArray);
return $this->renderText($servermsg);
}
return false;
}
The method of concern in the Table.class.php file looks like this:
public function addDataToTable($dataArray)
{
// process $dataArray and retrieve the necessary data
$data = new Data();
$data->field = $dataArray['field'];
.
.
.
$data->save();
return $data->id ;
}
The method fails up here in the model, when renderText in the action is returned and logged into the console, it returns the HTMl for SFDEBUG. Which indicates that it failed.
If this was not an Ajax call, I could debug it by seeing what the model method spat out, but this is a little tedious with Ajax in the mix.
Not looking for exact answers here, but more on how I can approach debugging ajax requests in a symfony environment, so if there are suggestions on how I can debug this, that would be great.
You must send cookie with session ide key via ajax
(Assuming you have XDEBUG configured on the server)
In order to trigger a debug session by an AJAX request you have to somehow make that request to send additional URL parameter XDEBUG_SESSION_START=1. For your example:
$.post(url + '?XDEBUG_SESSION_START=1', jsonData, function(servermsg) { console.log(servermsg); }) ;
You can also trigger it via cookie, but appending URL parameter usually easier.
In my application I am trying to get it so that when a REST api call is made, if there is an error that it return a proper status code then either Json or Xml in the body of the response.
So 400: { 'ErrorCode': '400', 'Reason' : 'You did something wrong..' }
or 400: <Error><ErrorCode>400</ErrorCode><Reason>You did something wrong</Reason></Error>
However I can't seem to find how to set the status and body to make this happen. Using fiddler inspect whats being passed back and fourth I've found that if I return a normal ActionResult then I can return the body message ok but the status is 200. If I use HttpException then I can set the status code but the body message is returned as a large html document. I've tried using HttpStatusCodeResult but that just seems to fail and return a 302.
I'm a bit stumped.
Try Response.StatusCode = (int)HttpStatusCode.BadRequest; in your action method. Check out this article at develoq for a short tutorial: http://develoq.net/2011/returning-a-body-content-with-400-http-status-code/
Web API can handle this in various ways, but if you want to stick to ASP.NET MVC then use the code below:
Response.StatusCode = 500;
Response.TrySkipIisCustomErrors = true;
return Content("Error description goes here.", "text/plain");
Check out MVC 4 Beta, there is a new feature called Web API that will help you solve this issue.