I'm trying to return text to a message box when an error occurs and the return type is JsonResult.
I believe I'm returning a valid type, but when the messagebox appears, it says "undefined".
I have the Json set up as the following:
string maxChars = "Upload file size exceeded!";
return Json(new { MaxCharacters = maxChars });
What am I doing wrong?
If you are returning this json data from an HttpGet action method, you should explicitly tell the Json method to allow sending back the json data for a GET request.
public ActionResult YourMethod()
{
string maxChars = "Upload file size exceeded!";
return Json(new { MaxCharacters = maxChars }, JsonRequestBehavior.AllowGet);
}
And in your client side code, you should be accessing the MaxCharacters property of the response coming back from the ajax call.
$.get("#url.Action("YourMethod","YourControllerName")",function(res){
alert(res.MaxCharacters);
});
Related
I am wrote API method, after calling that method , I got my response like
[
{
"spark_version": "7.6.x-scala2.12"
}
]
Now I want to have variable in my API method which store value 7.6.x-scala2.12.
API Controller method
[HttpGet]
public IActionResult GetTest(int ActivityId)
{
string StoredJson = "exec sp_GetJobJSONTest " +
"#ActivityId = " + ActivityId ;
var result = _context.Test.FromSqlRaw(StoredJson);
return Ok(result);
}
So how this variable should call on this response to get string stored in spark_version?
Thank you
As you have the JavaScript tag, here's how you'd do it in JS:
If you are able to call your API method, then you can just assign the response to a variable. For example, if you are calling it using the fetch API, it would look something like:
let apiResponse;
fetch('myApiUrl.com').then((response) => {
if (response.status === 200) {
apiResponse = response.body;
console.log('Response:', apiResponse[0]['spark_version']);
}
});
(I defined the variable outside the then to make it globally accessible)
Angular service.ts:
getExcel() {
let link: string = (this.url);
return link;
}
component.ts:
public getExcel() {
//checks if string is empty, undefined or not null
if (this.langCode) {
return window.open(this.avrs.getExcel());
}
}
Java rest.java
#GET
#Path("/excel")
#Produces("application/vnd.ms-excel")
public Response getTransportCostsExcel(
#Context HttpServletRequest request,
) {
byte[] excelInBytes = excelGen.getExcel();
if(excelInBytes == null){
return Response.status(Response.Status.NOT_FOUND).entity("No data").build();
}
//Header details
String contentType = "application/vnd.ms-excel";
Response.ResponseBuilder responseBuilder = javax.ws.rs.core.Response.ok((Object) excelInBytes);
responseBuilder.type(contentType);
responseBuilder.header("Content-Disposition", "attachment; filename=" + fileName);
//Returns Excel
return responseBuilder.build();
}
When I try calling my api from postman i get "No data" and status is 401 not found. So the rest method works fine.
I get my excel file if data is found. But I can't seem to handle the 401 response. Angular opens a new window and says
site not avaliable: ERR_INVALID_RESPONSE
As you can see im not using http.get cause I want the user to start downloading the excel if the file is found.
I'm trying to use an ajax call to get json data about my model from my controller. I know 500 error could mean lots of things but I would like to eliminate the possibility of simple error by me.
Console gives me error of: 500 Internal Service Error.
Otherwise I can access it in the url just fine but I don't get anything in the console.
Index.cshtml
function getData() {
$.ajax({
url: "#Url.Action("dataTransfer", "Data")",
type: "GET",
dataType: "json",
success: function(data) {
console.log(data);
},
error: function() {
console.log("failed");
}
});
}
setInterval(function() {
getData();
}, 10000);
DataController
public JsonResult dataTransfer()
{
string DataProvider = "Sample";
var model = from d in db.Data
where d.Name == DataProvider
select d;
return Json(model);
}
500 internal error means your server code is failing, running into an exception because of bad code !
From your code, i can see a problem which could be the cause of your error.
When returning Json from a GET action method, you need to pass JsonRequestBehaviour.AllowGet as the second parameter of Json method.
public JsonResult dataTransfer()
{
string DataProvider = "Sample";
var model = from d in db.Data
where d.Name == DataProvider
select d;
return Json(model,JsonRequestBehavior.AllowGet);
}
Usually in an ASP.NET MVC application, the GET method's are supposed to be returning a view and typically the POST method does some processing on the posted form data/ajax data and return a response, which can be JSON. But if you really want to return Json data from your GET action method, You have to explicitly specify that using the above method we did
Ofcourse, Web API's has a different concept (And implementation behind the scene)
I have an Action method that returns JSON, for brevity, I excluded code. :
public ActionResult SetMasterLocation(string masterValue)
{
json = new JavaScriptSerializer().Serialize(masterLocation);
return Json(json, JsonRequestBehavior.AllowGet);
}
I need to call this method and access the JSON string that gets returned:
var jVendors = SetMasterLocation(masterValue);
When I run it and inspect the output, I see the JSON string in a dynamic property called Data:
But if I try to access data like this, the app will not compile because the compiler says Cannot resolve symbol 'Data':
var jVendors = SetMasterLocation(masterValue);
var data = jVendors.Data;
How do I access the Data property at runtime?
Return JsonResult
return new JsonResult()
{
Data = someData,
JsonRequestBehavior = JsonRequestBehavior.AllowGet
};
Then, you can access Data property of the result
Here is my scenario, I fetch the data from the database, try/catch it in the controller action and would like to pass the code and the error message back to my js.
//in my action
[HttpPost]
public JsonResult GetWorkorderDetails(string folderno)
{
try{
//do some stuff - fetch the data
}catch() {
//if error, I would like to set the JsonResult to return bad status and error message
}
}
//in my js
if(response.status == 400){
//if error, output the message response.responseText and return
}
Any way to set my response status to 400 inside the action in the catch statement?
I would change return type to generic ActionResult and when needed return new HttpStatusCodeResult.