Develop Reference

How to pass data from a controller to view during a JQuery AJAX call in MVC?

In my view, I have an AJAX call which sends an id parameter to my controller. This bit works fine. In my controller, I plan to query the database with that id, pull out associated data and want to send this back to the AJAX call/view. This is the bit I am struggling with, as I am new to AJAX calls.
var chosenSchoolID = $("#SelectedSchoolId").val();
$.ajax({
url: "/Home/GetSchoolDetailsAJAX",
type: "POST",
data: {
schoolID: chosenSchoolID
},
dataType: "text",
success: function(data) {
if (data == "success") {
}
},
error: function(data) {
if (data == "failed")
alert("An error has occured!");
}
});
The above is my AJAX call, and this does hit my controller method. However in my controller, I want to now send back other string data and I am unsure on how to do this (just placeholder code currently)
[HttpPost]
public ActionResult GetSchoolDetailsAjax(string schoolID)
{
// query database using schoolID
// now we have other data such as:
string SchoolName = "";
string SchoolAddress = "";
string SchoolCity = "";
return null;
}
Must I declare variables in my Jquery and pass into the data parameter of the AJAX call in order for the values to be passed?
Many thanks in advance

The simplest way to do this is to return the entities retrieved from your database using return Json() from your controller.
Note that when retrieving data then a GET request should be made, not a POST. In addition the default MVC configuration should have the routes setup to allow you to provide the id of the required resource in the URL. As such, try this:
$.ajax({
url: "/Home/GetSchoolDetailsAJAX/" + $("#SelectedSchoolId").val(),
type: "get",
success: function(school) {
console.log(school);
},
error: function() {
alert("An error has occured!");
}
});
[HttpGet]
public ActionResult GetSchoolDetailsAjax(string id) {
var school = _yourDatabaseContext.Schools.Single(s => s.Id == id); // assuming EF
return Json(school);
}
If you'd like to test this without the database integration, amend the following line:
var school = new {
Id = id,
Name = "Hogwarts",
Address = "Street, City, Country"
};

How to pass data to ajax function with json?

I need to get an id from the URL , comment value from textbox, save it to database and show on page with ajax.
Im not sure how should look correct syntax in my controller and ajax function.
Controller
[HttpPost]
public JsonResult AddComment(int id, string comment)
{
if (ModelState.IsValid)
{
return Json(true); // what should be here
}
return Json(true);
}
Ajax
$('#submit').click(function () {
$.ajax({
url: '/Form/AddComment',
method: 'POST',
data: {
id: 4, //how to get id from url?
comment: 'test' //how to get textbox value?
},
success: function (data) {
console.log(data)
},
error: function (a, b, c) {
console.log('err')
}
})
});
this just show me that it work but i dont know how to move forward

Based upon your requirement, you would have to do the appropriate form handling at client side in order to get your variables like id and comment. You can use strongly typed model binding to get your form values and process them on submit or you can use JavaScript techniques to process your form variables. To extract out id from a URL, you can use a Regular Expression or other JavaScript string parsing techniques. I am giving you a simple example of getting your id from a URL and comment from a text box using JavaScript:
Your input control would look like:
<input type="text" id="commentBox" name="Comment" class="form-control" />
In order to achieve your desired functionality using AJAX to POST your form variables to controller, refer to the following code snippet:
AJAX:
<script type="text/javascript">
var url = 'http://www.example.com/4'; //Example URL string
var yourid = url.substring(url.lastIndexOf('/') + 1);
var yourcomment= document.getElementById('commentBox').value;
var json = {
id: yourid, //4
comment: yourcomment
};
$('#submit').click(function (){
$.ajax({
url: '#Url.Action("AddComment", "Form")',
type: "POST",
dataType: "json",
data: { "json": JSON.stringify(json)},
success: function (data) {
console.log(data)
},
error: function (data) {
console.log('err')
},
});
};
</script>
And you can get your values in your Controller like this:
using System.Web.Script.Serialization;
[HttpPost]
public JsonResult AddComment(string json)
{
if (ModelState.IsValid)
{
var serializer = new JavaScriptSerializer();
dynamic jsondata = serializer.Deserialize(json, typeof(object));
//Get your variables here from AJAX call
string id= jsondata["id"];
string comment=jsondata["comment"];
// Do something here with your variables.
}
return Json(true);
}

My solution looks like this:
controller:
[HttpPost]
public JsonResult AddComment(int id_usr,string comment)
{
if (ModelState.IsValid)
{
Comments kom = new Comments();
kom.DateComment = DateTime.Now;
kom.Id_usr = id_usr;
kom.Comment = comment;
db.Comments.Add(kom);
db.SaveChanges();
return Json(kom);
}
return Json(null);
}
View
var url = window.location.pathname;
var idurl = url.substring(url.lastIndexOf('/') + 1);
$('#submit').click(function () {
console.log('click')
$.ajax({
url: '/form/AddComment',
method: 'POST',
data: {
comment: $("#Comments_Comment").val(),
id_usr: idurl,
},
success: function (data) {
console.log(data),
thank you all for guiding me to the solution

AJAX HTTP Method GET Goes To Server Only Once

When I make ajax request to the server with breakpoint in the action method it stops on this breakpoint only the first time. After clicking for second, third etc. it goes but never stops on this breakpoint. When I change the method from GET to POST it stops every time. What is the reason for this behaviour ?
CLIENT SIDE:
$(function () {
setListAction();
});
function setListAction() {
$("li.list").on("click", function () {
alert("active");
var id = $(this).attr("file-id");
$.ajax({
type: "GET",
url: "TechAcc/ManageFile/" + id,
beforeSend: function myfunction() {
$("#loading").css("display", "block");
$("#fade").css("display", "block");
},
success: function (data) {
var content = $(data).find("div#content");
$("div#content").html(content.html());
$("#loading").css("display", "none");
$("#fade").css("display", "none");
}
});
});
}
SERVER SIDE:
[HttpGet]
public ActionResult ManageFile(int id = 0)
{
FileModel model = null;
if (id != 0)
model = new FileModel() { File = _repository.GetFileBy(id), GetAllFiles = _repository.GetAllFiles() };
else if (Session["Model"] != null)
model = (FileModel)Session["Model"];
else
model = new FileModel() { GetAllFiles = _repository.GetAllFiles() };
return View(model);
}

if your div with id "content" has list, it will not work.
<div id="content">
if your list is here, it won't work.
...
<li class="list">...</li>
...
</div>
if your design is like that, you need to bind click event after you replace your HTML response. i.e.,
success: function (data) {
var content = $(data).find("div#content");
$("div#content").html(content.html());
//adding code here.
$("div#content").find("li.list").on("click", function() {
//same above click code should come here.
//Note: this newly added code block should not come here in click.
});
$("#loading").css("display", "none");
$("#fade").css("display", "none");
}

Using Ajax to trigger an Action Result c#

Using the following script:
$(document).ready(function () {
$('#submit').click(function () {
var companyId = $('#companyCoid').val();
var erpKey = $('#erpKey').val();
if (companyId == "" || erpKey == "") {
alert("You have not entered enough information");
} else {
$.ajax({
type:post,
url: '#Url.Action("ErpDocument")',
data: {
coid: companyId,
documentKey: erpKey
}
});
}
});
});
I am trying to trigger this action result which would navigate to a new view:
[HttpPost]
public ActionResult ErpDocument(string coid, string documentKey)
{
var cview = new ConnectorViewModel();
Stuff and things here....
return View(cview);
}
I am getting the information from a form above and the check for blank fields works just fine, however, the function in my controller is never hit.
EDIT: Reason it wasn't hitting the ActionResult was I had post and not "POST", this now hits my method but does not display my new view.

I think the default contenttype is xml. you may need to add this
contenttype: "application/json; charset=utf-8"
. I think that's what I've had to do before. Although unlikely, you may need to add a datatype as well.
https://api.jquery.com/jQuery.ajax/

Ajax to MVC controller. Not passing parameters unless Ajax followed by alert

I have the strangest situation. I have two ajax POST. First I had problems passing the parameters to the controller but at some point I got them trough and with some debugging I figured out that I only get all of the values to the controller if my ajax definition is followed by an alert.
One of them:
$.ajax({
type: 'POST',
url: '/Contact/IntresseAnmälan/',
dataType: 'json',
data: {
Namn: $('#namn').val(),
Mail: $('#mail').val(),
Info: $('#meddelande').val(),
Telefon: $('#nr').val(),
IsEnkel: false,
PassId: function () {
var url = window.location.pathname;
var id = url.substring(url.lastIndexOf('/') + 1);
return id;
},
Participanter: getParticipant(),
ParticipantMail: getParticipantMail()
},
traditional: true,
success: function (result) {
// window.location.href = '#Url.Action("IntresseAnmälan", "Contact")';
}
});
alert("Hur sparas dina uppgifter?");
Here are my Getters for name and mail. The form-elements(input type mail and text) theese are dynamicly added to the form if the user wants clicks a button two inputs are added. Then theese functions returns an array with the inputed values from the form.
function getParticipant() {
var p = [];
for (var i = 1; i <= participantCount; i++) {
var name = '#anNamn' + i;
p[i -1] = $(name).val()
}
return p;
}
function getParticipantMail() {
var p = [];
for (var i = 1; i <= participantCount; i++) {
p[i -1] = $('#anMail' + i).val();
}
return p;
}
And here is my controller. I've removed the body in the controller. It saves to the Db and send a verification mail to the admin.
[HttpPost]
public ActionResult IntresseAnmälan(BokningContainer bokning)
{
//Saves to Db and Send a verification mail to admin
}
If I exclude the alert after the ajax some parameters are passed, I think it's Namn and Mail, but most of them not passed. I'm quite puzzled.
Also, is ajax the only way to pass an object to a controller from jQuery?

Also, is ajax the only way to pass an object to a controller from
jQuery?
No, you can use a regular HTML Form to submit your data, you just have to conform to the expected object in the controller Action (should be decorated with HttpPostAttribute) - There is a Model-Binding process which attempting to bind the Request data to your domain object.

You don't need to pass every field's value using jQuery. Instead you can create a form whose data you want to post like :
<form id="frmTest">
... add input types here
</form>
and you can pass data of form using $('#frmTest').serialize() method to the controller
$.ajax({
type: "POST",
data: $('#frmTest').serialize(),
url: "url",
dataType: "json",
success: function (data) { alert('worked!'); },
error: function (data) {
alert('error');
}
});