How to make Ajax call to method from controller - javascript

I have Controller PdfViewerController
inside of this controller I have a method
private static string GeneratePdfUrl(string test)
{
string aUrl;
//some action//
return aUrl
}
and I have pdfviewercontroller.js
inside or this js I want to crete a function that will return a string from Controller using GeneratePdfUrl()
something like this
function _doUrl() {
$.ajax({
type: "GET",
url: ep.utilities.replaceEPCommand('PdfViewer/GeneratePdfUrl'),
data: { "test": "R"}
});
}
what I'm doing wrong. Do I need something like .done ?
I try to create ajax Get function and expected to get string inside of my javascript


Assuming that you have an MVC Home controller
[HttpGet]
public JsonResult ForAjaxCall(string test)
{
var aUrl=GeneratePdfUrl(test);
return Json(person, JsonRequestBehavior.AllowGet);
}
This controller will call your custom method
public string GeneratePdfUrl(string test)
{
string aUrl;
//some action//
return aUrl
}
Inside your js file do something like :
function _doUrl() {
$.ajax({
type: "GET",
url: "/Home/ForAjaxCall",
data: { { "test": "R"} },
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
alert("You got your URL "+ response.aUrl);
},
failure: function (response) {
alert("Something wrong");
},
error: function (response) {
alert(response.responseText);
}
});
}
Hope this will help you understand the flow.

Related

How to get a string from Controller and use it in view?

I'm trying to get some string from my Controller and use it in the View.
The ActionResult works like this:
public ActionResult GetSymbols()
{
string result = "SVG-String";
return Content(result);
}
This result is will be a svg-formatted string and should be shown in my svg-drawing, at the end.
I tried to call this controller-Action, using JavaScript and I could reach the Controller but how could I use the String? I couldn't see any result, so what is the rigth way to get the returned string into a variable?
The last try was like this:
$(document).ready(function () {
$.ajax({
url: "/Symbols/GetSymbols/",
method: "GET",
async: false,
data: "",
dataType: "string",
success: function (data) { alert(data); }
});
});

How about this one,
Change your Controller return type to Json
[HttpGet]
public JsonResult GetSymbols()
{
string result = "SVG-String";
return Json(result, JsonRequestBehavior.AllowGet);
}
And your javascript be like,
$(document).ready(function () {
$.ajax({
method: "GET",
url: "/Symbols/GetSymbols/",
async: false,
dataType: "json",
success: function (data) {
alert(data);
},
error: function (response) {
console.log(response);
}
});
});

Javascript Success Function

i have this function in Javascript
function searchLoc() {
var a = document.getElementById('textL').value;
var lines = new Array();
lines.push(a);
$.ajax({
url: '/home/SearchLoc',
type: 'POST',
dataType: 'json',
data: JSON.stringify({ 'lines': lines }),
contentType: 'application/json',
async: false,
cache: false,
success: function (result) {
window.location.replace("/OurBoxes");
}, error: function () {
alert("Chiamata fallita!!!");
}
});
}
This function call the function SearchLoc in the controller Home:
[HttpPost]
public bool SearchLoc(string[] lines)
{
string titolo = lines[1];
return true;
}
Both functions works well but when i return true, ajax execute the error statement and not the success funtion. Naturally i must to modify the controller, this is a test. Why if i return true it go on error.
Thanks to all

Your ajax function specifies that the return type is json, but your controller method returns bool. Change the method to return json
[HttpPost]
public bool JsonResult(string[] lines)
{
....
return Json(true);
}

Calling controller method from Javascript function

i want to call a controller method from a javascript method. I have the following code:
function test() {
$.ajax({
url: #Url.Action("abc"),
method: 'GET',
success: function(data) { alert(data); }
});
}
[HttpGet]
public string abc(string id)
{
return "Info";
}
How is it possible to get the "info" string back, in my alert() in the Javascript controller?

You need to add dataType attribute in ajax call.
Try this one:
function test() {
$.ajax({
url: #Url.Action("abc"),
method: 'GET',
dataType: "text",
success: function(data) { alert(data); }
});
}

Unable to call Controller Method from view via javascript

I am calling a controller method from java script the method works fine i can see the alter but while debugging the control never goes to the controller method .. here is the
script
<script type="text/javascript">
function confirmDelete(customerID) {
if (confirm('Are you sure you want to Delete?')) {
$.ajax({
url: 'Home/Delete',
data: { ID: customerID },
success: function () {
alert('Added');
}
});
}
else {
// Do nothing!
}
}
</script>
here is the "Home" controller method
public ActionResult Delete(String ID)
{
data.Delete(ID);
return View("Home");
}
Update:
and here is how i am calling this JS function
<img alt="delete" src="../../Images/icons-png/delete-black.png" />

Here is Solution :
Add base URL Before your controller name
$.post(baseUrl + '/' + controller + '/' + method, data, onSuccess).error(function (err) {
if (onError) onError(err);
});
here baseUrl Will be like
'httpsORhttp://Domain/SiteName'

Use This
$.ajax({
url: "URL",
type: "POST",
contentType: "application/json;charset=utf-8",
data: JSON.stringify("VARIABLE TO PASS"),
dataType: "json",
success: function (response) {
alert(response);
},
error: function (x, e) {
alert('Failed');
alert(x.responseText);
alert(x.status);
}
});

Making a Simple Ajax call to controller in asp.net mvc

I'm trying to get started with ASP.NET MVC Ajax calls.
Controller:
public class AjaxTestController : Controller
{
//
// GET: /AjaxTest/
public ActionResult Index()
{
return View();
}
public ActionResult FirstAjax()
{
return Json("chamara", JsonRequestBehavior.AllowGet);
}
}
View:
<head runat="server">
<title>FirstAjax</title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var serviceURL = '/AjaxTest/FirstAjax';
$.ajax({
type: "POST",
url: serviceURL,
data: param = "",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: successFunc,
error: errorFunc
});
function successFunc(data, status) {
alert(data);
}
function errorFunc() {
alert('error');
}
});
</script>
</head>
I just need to print an alert with the controller method returning data. Above code just print "chamara" on my view. An alert is not firing.
UPDATE
I modified my controller as below and it start working. I don't have an clear idea why it's working now. Some one please explain. The parameter "a" does not related i added it because i can not add two methods with same method name and parameters.I think this might not be the solution but its working
public class AjaxTestController : Controller
{
//
// GET: /AjaxTest/
[HttpGet]
public ActionResult FirstAjax()
{
return View();
}
[HttpPost]
public ActionResult FirstAjax(string a)
{
return Json("chamara", JsonRequestBehavior.AllowGet);
}
}

Remove the data attribute as you are not POSTING anything to the server (Your controller does not expect any parameters).
And in your AJAX Method you can use Razor and use #Url.Action rather than a static string:
$.ajax({
url: '#Url.Action("FirstAjax", "AjaxTest")',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: successFunc,
error: errorFunc
});
From your update:
$.ajax({
type: "POST",
url: '#Url.Action("FirstAjax", "AjaxTest")',
contentType: "application/json; charset=utf-8",
data: { a: "testing" },
dataType: "json",
success: function() { alert('Success'); },
error: errorFunc
});

After the update you have done,
its first calling the FirstAjax action with default HttpGet request
and renders the blank Html view . (Earlier you were not having it)
later on loading of DOM elements of that view your Ajax call get fired and displays alert.
Earlier you were only returning JSON to browser without rendering any HTML. Now it has a HTML view rendered where it can get your JSON Data.
You can't directly render JSON its plain data not HTML.

Use a Razor to dynamically change your URL by calling your action like this:
$.ajax({
type: "POST",
url: '#Url.Action("ActionName", "ControllerName")',
contentType: "application/json; charset=utf-8",
data: { data: "yourdata" },
dataType: "json",
success: function(recData) { alert('Success'); },
error: function() { alert('A error'); }
});

If you just need to hit C# Method on in your Ajax Call you just need to pass two matter type and url if your request is get then you just need to specify the url only. please follow the code below it's working fine.
C# Code:
[HttpGet]
public ActionResult FirstAjax()
{
return Json("chamara", JsonRequestBehavior.AllowGet);
}
Java Script Code if Get Request
$.ajax({
url: 'home/FirstAjax',
success: function(responce){ alert(responce.data)},
error: function(responce){ alert(responce.data)}
});
Java Script Code if Post Request and also [HttpGet] to [HttpPost]
$.ajax({
url: 'home/FirstAjax',
type:'POST',
success: function(responce){ alert(responce)},
error: function(responce){ alert(responce)}
});
Note: If you FirstAjax in same controller in which your View Controller then no need for Controller name in url. like url: 'FirstAjax',

First thing there is no need of having two different versions of jquery libraries in one page,either "1.9.1" or "2.0.0" is sufficient to make ajax calls work..
Here is your controller code:
public ActionResult Index()
{
return View();
}
public ActionResult FirstAjax(string a)
{
return Json("chamara", JsonRequestBehavior.AllowGet);
}
This is how your view should look like:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
var a = "Test";
$.ajax({
url: "../../Home/FirstAjax",
type: "GET",
data: { a : a },
success: function (response) {
alert(response);
},
error: function (response) {
alert(response);
}
});
});
</script>

It's for your UPDATE question.
Since you cannot have two methods with the same name and signature you have to use the ActionName attribute:
UPDATE:
[HttpGet]
public ActionResult FirstAjax()
{
Some Code--Some Code---Some Code
return View();
}
[HttpPost]
[ActionName("FirstAjax")]
public ActionResult FirstAjaxPost()
{
Some Code--Some Code---Some Code
return View();
}
And please refer this link for further reference of how a method becomes an action. Very good reference though.

View;
$.ajax({
type: 'GET',
cache: false,
url: '/Login/Method',
dataType: 'json',
data: { },
error: function () {
},
success: function (result) {
alert("success")
}
});
Controller Method;
public JsonResult Method()
{
return Json(new JsonResult()
{
Data = "Result"
}, JsonRequestBehavior.AllowGet);
}

instead of url: serviceURL,
use
url: '<%= serviceURL%>',
and are you passing 2 parameters to successFunc?
function successFunc(data)
{
alert(data);
}

Add "JsonValueProviderFactory" in global.asax :
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
ValueProviderFactories.Factories.Add(new JsonValueProviderFactory());
}

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