I have an unobtrusive validation defined on a class which validates that the number entered is a valid number in the database. I'd prefer not to use a Remote attribute, as it ties me to a specific controller instead of a service, and the class is actually in a library that is not in the MVC Web application. I'd like to use JavaScript as follows:
$.validator.addMethod("validid", function (value, element) {
$.ajax({
url: 'mypage.html',
success: function(){
return true;
},
error: function(){
return false;
}
});
});
$.validator.unobtrusive.adapters.addBool("validid");
I know that I can use an addsingleval and pass in all of the valid IDs in an array, but I would prefer the method to call a service and validate the sing value on the server instead of passing in all possible values in the database. I do recognize the problem of making an asynchronous call and trying to return the value in the function that has already completed, but I'm wondering if there's some other way to make this work.
I'd prefer not to use a Remote attribute, as it ties me to a specific
controller instead of a service, and the class is actually in a
library that is not in the MVC Web application.
If I understand your problem, what prevents you from using the Asp.Net Mvc Remote attribute is that you are only offered routes when you want to specify an arbitrary url.
Maybe you can try with a custom override of the Remote attribute
public class CustomRemote : RemoteAttribute
{
protected String url { get; set; }
public CustomRemote(string url)
{
this.url = url;
}
protected override string GetUrl(ControllerContext controllerContext)
{
return url;
}
}
Then, in your view model :
[CustomRemote("mypage.html")]
public String Id
While the answer #jbl provided would work, we are trying to keep the validation logic in a separate class, and would prefer not to include the MVC library. The solution ended up being relatively simple, using an async: false in the method. We ended up with:
$.validator.addMethod("validid", function (value, element) {
var isValid = false;
$.ajax({
url: 'mypage.html',
async: false,
success: function(data){
isValid = data;
},
error: function(){
isValid = false;
}
});
return isValid;
});
$.validator.unobtrusive.adapters.addBool("validid");
Related
I have set up remote validation on a input control which accepts employee code. Remote validation checks if the code is valid. This works like a charm.
But, in the event of successful validation I would like to return more information for my web page (name, address, telephone number) which would be displayed on the page.
Can you give me the link or an example on how to accomplish this?
Do an ajax call to your controller/action from your client side upon successful remote validation. Use HTML DOM manipulation to show and hide the contents.
Can you give more detail or code?
From what i can gather you're wanting something like this in your controller:
public JsonResult EmployeeCodeValidate(string employeeCode)
{
if(!Valid(employeeCode)) // however you are validating here
{
return Json(new { valid = false;});
}
EmployeeDetails details = GetEmployeeDetails(employeeCode);
return Json(new { valid = true, details = details });
}
class EmployeeDetails
{
string name { get; set; }
string phoneNo { get; set }
...
}
If this is the sort of thing you're meaning then the JavaScript would look like:
$.ajax({
dataType: "json",
url: "/Controller/EmployeeCodeValidate?employeeCode=" + code,
cache: false,
success: function (data) {
ajaxSuccess(data);
}
});
function ajaxSuccess(data){
if(data.valid) {
//add elements using data.details.name etc
}
}
I've been working on a project were all of my requirements involved JSON. However now suddenly I have a need to return results from my model that can be used in an input elements value field. I can't use the solution I have been as I get objects returned instead of plain text for the value. This is the controller pattern I have been using:
public virtual JsonResult fooData()
{
var fooresults = new fooQueries().fooTotal();
return new JsonResult
{ JsonRequestBehavior = JsonRequestBehavior.AllowGet, Data = fooresults };
}
Is there a way to use return content instead of JsonResult? I'm fairly new to the .NET MVC framework and having some difficulty finding the correct way to do this.
My current results are formatted like this:
[{ "foo", 3 }]
Instead I would prefer to get plain text so that I can use an AJAX request to pass the 3 value into an input elements value="" field.
AJAX call I am using with the controller:
$.ajax({
type: 'GET',
url: $('#fooValue').data('url'),
success: function (data) {
$('#fooValue').val(data);
}
});
The data-url is equivalent to:
../fooController/fooData
I'm just using T4MVC.
Return a ContentResult instead of a JsonResult
public virtual ContentResult gooData()
{
var fooresults = new fooQueries().fooTotal();
return Content(fooresults);
}
You can return content as:
return Content(fooresults);
But this wont be clean to you separate the elements as JSON return is.
I'm not sure what the shape of fooresults is, but you should be able to alter your AJAX call to the following:
$.ajax({
type: 'GET',
url: $('#fooValue').data('url'),
success: function (data) {
$('#fooValue').val(data.foo);
}
});
If the dataType property of the jQuery ajax call isn't explictly set, then jQuery will try and infer the type of the return result based on the MIME type, which in your case will be JSON. Therefore jQuery will deserialise the JSON to a JSON object. See http://api.jquery.com/jQuery.ajax/ for more info.
to return a Json, the method should be changed as follow:
public JsonResult fooData()
{
var fooresults = new fooQueries().fooTotal();
return Json(fooresults , JsonRequestBehavior.AllowGet);
}
Is there a way to map from/to a POCO and knockoutjs observable?
I have a Note class:
public class Note
{
public int ID { get; set; }
public string Date { get; set; }
public string Content { get; set; }
public string Category { get; set; }
public string Background { get; set; }
public string Color { get; set; }
}
and this is my javascript:
$(function () {
ko.applyBindings(new viewModel());
});
function note(date, content, category, color, background) {
this.date = date;
this.content = content;
this.category = category;
this.color = color;
this.background = background;
}
function viewModel () {
this.notes = ko.observableArray([]);
this.newNoteContent = ko.observable();
this.save = function (note) {
$.ajax({
url: '#Url.Action("AddNote")',
data: ko.toJSON({ nota: note }),
type: "post",
contentType: "json",
success: function(result) { }
});
}
var self = this;
$.ajax({
url: '#Url.Action("GetNotes")',
type: "get",
contentType: "json",
async: false,
success: function (data) {
var mappedNotes = $.map(data, function (item) {
return new note(item.Date, item.Content, item.Category, item.Color, item.Background);
});
self.notes(mappedNotes);
}
});
}
Ignore the fact that the save function is not used (to simplify the code here).
So, when I load the page I call the server and I retrieve a list of Note objects and I map it in javascript. Notice how ID is not mapped because I dont need it in my view.
So far so good, I see the notes on screen, but how I can save the notes back to the server?
I tried to convert the note (Im saving just the new note and not the entire collection) to JSON and send it to my controller but I don't know how to access to the note in the controller. I tried:
public string AddNote(string date, string content, string category, string background, string color)
{
// TODO
}
but is not working. I want to have something like:
public string AddNote(Note note) {}
(Btw, what's the best return for a method that just save data on DB? void?)
So, How I do this? I tried knockout.mapping plugin but it is quite confusing and I don't get it working for me.
Thank you.
ASP.NET MVC's model binder will look for properties that are case-sensitive. You need to pass your JSON object back to the server with the property names matching your poco object.
I usually do 1 of 2 things:
Make my javascript object property names capital (that way in JS, I know that this object will at some point be a DTO for the server)
function Note(date, content, category, color, background) {
this.Date = date;
this.Content = content;
this.Category = category;
this.Color = color;
this.Background = background;
};
In my AJAX call i will just create an anonymous object to pass back to the server (note this does not require ko.toJSON):
$.ajax({
url: '#Url.Action("AddNote")',
data: JSON.stringify({ note: {
Date: note.date,
Content: note.content,
Category: note.category,
Color: note.color,
Background: note.background
}
}),
type: "post",
contentType: "application/json; charset=utf-8",
success: function(result) { }
});
(note the different contentType parameter as well)
You will want to make your ActionMethod take in a (Note note) and not just the array of parameters.
Also, because the modelbinders look through the posted values in a couple different ways. I've had luck posting JSON objects with out specifying the ActionMethod parameter name:
instead of:
{ note: {
Date: note.date,
Content: note.content,
Category: note.category,
Color: note.color,
Background: note.background
}
}
just do:
{
Date: note.date,
Content: note.content,
Category: note.category,
Color: note.color,
Background: note.background
}
(but this can get dicey with arrays binding to collections and complex types...etc)
As far as the 'Best' signature for a return on a method that does a db call, we generally prefer to see boolean, but that also depends on your needs. Obviously if it is trivial data, void will be fine, but if its a bit more critical, you may want to relay a boolean (at the least) to let your client know it might need to retry (especially if there's a concurrency exception).
If you really need to let your client know what happened in the database, you can foray into the world of custom error handling and exception catching.
Also, if you need to display very specific information back to your user depending upon a successful/unsuccessful database commit, then you could look at creating custom ActionResults that redirect to certain views based upon what happened in the database transaction.
Lastly, as far as getting data back from the server and using Knockout...
again the mapping plugin will work if your property names are the same case or you create a slightly more explicit mapping
My own trick with my JS objects is below. The initialize function is something i created that should be reusable across all your objects as it just says "if the property names match (after being lowercased), either set them by calling the function (knockout compatible) or just assign the value.:
function Note(values){ //values are what just came back from the server
this.date;
this.content;
this.category;
this.color;
this.background;
initialize(values); //call the prototyped function at the bottom of the constructor
};
Note.prototype.initialize = function(values){
var entity = this; //so we don't get confused
var prop = '';
if (values) {
for (prop in values) {
if (values.hasOwnProperty(prop.toLowerCase()) && entity.hasOwnProperty(prop.toLowerCase())) {
//the setter should have the same name as the property on the values object
if (typeof (entity[prop]) === 'function') {
entity[prop](values[prop]); // we are assuming that the setter only takes one param like a Knockout observable()
} else {// if its not a function, then we will just set the value and overwrite whatever it was previously
entity[prop] = values[prop];
}
}
}
}
};
I am trying to achieve a JQuery AJAX call to a controller action method that contains a complex object as a parameter.
I have read plenty blogs and tried several techniques learned from these. The key post on which I have constructed my best attempt code (below) is the stackoverflow post here .
I want to trigger an asynchronous post, invoked when the user tabs off a field [not a Form save post – as demonstrated in other examples I have found].
My intention is to:
Instantiate an object on the client [not the ViewModel which provides the type for the View];
Populate the object with data from several fields in the view;
Convert this object to JSON;
Call the controller action method using the jQuery.Ajax method, passing the JSON object.
The results will be returned as a JSON result; and data will be loaded into fields in the view depending on results returned.
The problems are:
If the action method is attributed with the HttpPost attribute, the controller Action method is not invoked (even though the AJAX call type is set to ‘POST’).
If the action method isattributed with HttpGet, the values of properties of the parameter are null
The ReadObject method throws the error: "Expecting element 'root' from namespace ''.. Encountered 'None' with name 'namespace'".
Hopefully someone can help. Thanks. Code below:
Client js file
var disputeKeyDataObj = {
"InvoiceNumber": "" + $.trim(this.value) + "",
"CustomerNumber": "" + $.trim($('#CustomerNumber').val()) + ""
};
var disputeKeyDataJSON = JSON.stringify(disputeHeadlineData);
$.ajax({
url: "/cnr/GetDataForInvoiceNumber",
type: "POST",
data: disputeKeyDataJSON,
dataType: 'json',
contentType: "application/json; charset=utf-8",
success: EnrichedDisputeKeyData(result)
});
Action Filter and class for the type associated with the Action method parameter
[DataContract]
public class DisputeKeyData
{
[DataMember(Name = "InvoiceNumber")]
public string InvoiceNumber { get; set; }
[DataMember(Name = "CustomerNumber")]
public string CustomerNumber { get; set; }
}
Action method on the controller
//[HttpPost]
[ObjectFilter(Param = "disputeKeyData", RootType = typeof(DisputeKeyData))]
public ActionResult GetDataForInvoiceNumber(DisputeKeyData disputeKeyData)
{
//Blah!
//....
return Json(disputeKeyData, JsonRequestBehavior.AllowGet);
}
Below is how I got this working.
The Key point was:
I needed to use the ViewModel associated with the view in order for the runtime to be able to resolve the object in the request.
[I know that that there is a way to bind an object other than the default ViewModel object but ended up simply populating the necessary properties for my needs as I could not get it to work]
[HttpPost]
public ActionResult GetDataForInvoiceNumber(MyViewModel myViewModel)
{
var invoiceNumberQueryResult = _viewModelBuilder.HydrateMyViewModelGivenInvoiceDetail(myViewModel.InvoiceNumber, myViewModel.SelectedCompanyCode);
return Json(invoiceNumberQueryResult, JsonRequestBehavior.DenyGet);
}
The JQuery script used to call this action method:
var requestData = {
InvoiceNumber: $.trim(this.value),
SelectedCompanyCode: $.trim($('#SelectedCompanyCode').val())
};
$.ajax({
url: '/en/myController/GetDataForInvoiceNumber',
type: 'POST',
data: JSON.stringify(requestData),
dataType: 'json',
contentType: 'application/json; charset=utf-8',
error: function (xhr) {
alert('Error: ' + xhr.statusText);
},
success: function (result) {
CheckIfInvoiceFound(result);
},
async: true,
processData: false
});
In doing an auto-refresh using the following code, I assumed that when I do a post, the model will automatically sent to the controller:
$.ajax({
url: '<%=Url.Action("ModelPage")%>',
type: "POST",
//data: ??????
success: function(result) {
$("div#updatePane").html(result);
},
complete: function() {
$('form').onsubmit({ preventDefault: function() { } });
}
});
Every time there is a post, I need to increment the value attribute in the model:
public ActionResult Modelpage(MyModel model)
{
model.value = model.value + 1;
return PartialView("ModelPartialView", this.ViewData);
}
But the model is not passed to the controller when the page is posted with jQuery AJAX request. How can I send the model in the AJAX request?
The simple answer (in MVC 3 onwards, maybe even 2) is you don't have to do anything special.
As long as your JSON parameters match the model, MVC is smart enough to construct a new object from the parameters you give it. The parameters that aren't there are just defaulted.
For example, the Javascript:
var values =
{
"Name": "Chris",
"Color": "Green"
}
$.post("#Url.Action("Update")",values,function(data)
{
// do stuff;
});
The model:
public class UserModel
{
public string Name { get;set; }
public string Color { get;set; }
public IEnumerable<string> Contacts { get;set; }
}
The controller:
public ActionResult Update(UserModel model)
{
// do something with the model
return Json(new { success = true });
}
If you need to send the FULL model to the controller, you first need the model to be available to your javascript code.
In our app, we do this with an extension method:
public static class JsonExtensions
{
public static string ToJson(this Object obj)
{
return new JavaScriptSerializer().Serialize(obj);
}
}
On the view, we use it to render the model:
<script type="javascript">
var model = <%= Model.ToJson() %>
</script>
You can then pass the model variable into your $.ajax call.
I have an MVC page that submits JSON of selected values from a group of radio buttons.
I use:
var dataArray = $.makeArray($("input[type=radio]").serializeArray());
To make an array of their names and values. Then I convert it to JSON with:
var json = $.toJSON(dataArray)
and then post it with jQuery's ajax() to the MVC controller
$.ajax({
url: "/Rounding.aspx/Round/" + $("#OfferId").val(),
type: 'POST',
dataType: 'html',
data: json,
contentType: 'application/json; charset=utf-8',
beforeSend: doSubmitBeforeSend,
complete: doSubmitComplete,
success: doSubmitSuccess});
Which sends the data across as native JSON data.
You can then capture the response stream and de-serialize it into the native C#/VB.net object and manipulate it in your controller.
To automate this process in a lovely, low maintenance way, I advise reading this entry that spells out most of native, automatic JSON de-serialization quite well.
Match your JSON object to match your model and the linked process below should automatically deserialize the data into your controller. It's works wonderfully for me.
Article on MVC JSON deserialization
This can be done by building a javascript object to match your mvc model. The names of the javascript properties have to match exactly to the mvc model or else the autobind won't happen on the post. Once you have your model on the server side you can then manipulate it and store the data to the database.
I am achieving this either by a double click event on a grid row or click event on a button of some sort.
#model TestProject.Models.TestModel
<script>
function testButton_Click(){
var javaModel ={
ModelId: '#Model.TestId',
CreatedDate: '#Model.CreatedDate.ToShortDateString()',
TestDescription: '#Model.TestDescription',
//Here I am using a Kendo editor and I want to bind the text value to my javascript
//object. This may be different for you depending on what controls you use.
TestStatus: ($('#StatusTextBox'))[0].value,
TestType: '#Model.TestType'
}
//Now I did for some reason have some trouble passing the ENUM id of a Kendo ComboBox
//selected value. This puzzled me due to the conversion to Json object in the Ajax call.
//By parsing the Type to an int this worked.
javaModel.TestType = parseInt(javaModel.TestType);
$.ajax({
//This is where you want to post to.
url:'#Url.Action("TestModelUpdate","TestController")',
async:true,
type:"POST",
contentType: 'application/json',
dataType:"json",
data: JSON.stringify(javaModel)
});
}
</script>
//This is your controller action on the server, and it will autobind your values
//to the newTestModel on post.
[HttpPost]
public ActionResult TestModelUpdate(TestModel newTestModel)
{
TestModel.UpdateTestModel(newTestModel);
return //do some return action;
}
I think you need to explicitly pass the data attribute. One way to do this is to use the
data = $('#your-form-id').serialize();
This post may be helpful.
Post with jquery and ajax
Have a look at the doc here..
Ajax serialize
you can create a variable and send to ajax.
var m = { "Value": #Model.Value }
$.ajax({
url: '<%=Url.Action("ModelPage")%>',
type: "POST",
data: m,
success: function(result) {
$("div#updatePane").html(result);
},
complete: function() {
$('form').onsubmit({ preventDefault: function() { } });
}
});
All of model's field must bo ceated in m.
In ajax call mention-
data:MakeModel(),
use the below function to bind data to model
function MakeModel() {
var MyModel = {};
MyModel.value = $('#input element id').val() or your value;
return JSON.stringify(MyModel);
}
Attach [HttpPost] attribute to your controller action
on POST this data will get available