When working with MVC4, how can I handle the response from a JsonResult action in an Ajax form?
Most tutorials focus on handling html responses (ActionResult), making it difficult to find examples for Json results.
I understand that this question is not very detailed and lacks code examples, but I intend to share my own solution based on personal experience. Hopefully, my answer will provide valuable insights on this topic.
If you're working in an ASP.NET controller using C#, you can easily return a JSON result by following this code snippet (assuming you're familiar with it).
[httppost]
public ActionResult MyAction(){
//this is the most amazing content
return Json(new
{
MyResult = "ok",
MyData = "This is some string data!"
});
}
It's a bit unclear what exactly you're looking for in terms of an answer, but hopefully this information proves to be helpful in some way.
For those utilizing jQuery AJAX, accessing the controller and retrieving the JSON results it provides is straightforward.
$.ajax({
type: "POST",
URL: "/MyController/MyAction",
dataType: "text"
})
.success(function(data){
var dataobj = $.parseJSON(data);
var result = dataobj.MyResult;
var msg = dataobj.MyData;
});
When employing return new Json();, keep in mind that the server response will have a ContentType of application/json. To ensure proper parsing using jQuery's parseJSON function, remember to pass the JSON as a string for correct interpretation. Include dataType: "text" in your $.ajax{} options to receive the server response as plain text for successful json parsing. This approach creates a dynamic object containing the returned data in JSON format, allowing you to access specific elements by their designated names.
I trust this explanation offers some insight into your query.
When following most examples and tutorials online, you are often advised to return a view using your HttpPost action method. This typically involves setting the 'UpdateTargetId' and InsertionMode properties on the AjaxOptions object.
However, if your intention is to return data and interact with it through JavaScript, this approach may not suffice. Instead, you will need to utilize the OnSuccess method of the AjaxOptions object.
While the documentation for OnSuccess may seem lacking in information, it actually requires the name of a JavaScript function available on the current page to work effectively. This function will be invoked callback-style, so ensure that you adhere to the correct syntax for your specific scenario.
Below is a demonstration to illustrate these concepts:
<HttpGet>
Function AjaxIndex() As ActionResult
Dim model As AjaxFormModel = New AjaxFormModel
' Customize the AjaxFormModel as needed.
Return View(model)
End Function
<HttpPost>
Function AjaxIndex(ByVal model As AjaxFormModel) As JsonResult
Dim result As AjaxFormResult = Nothing
' Populate the AjaxFormResult with relevant properties such as .MessageType and .Payload.
' TODO: Make sure to create a new object to pass to the `JsonResult`.
Return New JsonResult With {.Data = result, .JsonRequestBehavior = JsonRequestBehavior.AllowGet}
End Function
Using Ajax.BeginForm("AjaxIndex", "Bootstrap",
routeValues:=Nothing,
ajaxOptions:=New AjaxOptions With {.HttpMethod = "POST",
.OnSuccess = "updateAjaxForm"},
htmlAttributes:=Nothing)
@<text>
<div class="row">
<div class="col-sm-12" id="UnknownError_message">
</div>
</div>
<div class="row">
<div class="col-md-12">
<input type="text" name="Name" />
<div id="Name_message"></div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<input type="submit" class="btn btn-default" value="Save" />
</div>
</div>
</text>
End Using
<script type="text/javascript">
function updateAjaxForm(data) {
// The data parameter contains a processed JavaScript object. Thanks to MVC!
var messageElement = $('#UnknownError_message');
switch (data.MessageType) {
case 0: // Error message
messageElement.html('Error: ' + data.Message);
break;
case 1: // Textual message
messageElement.html('Info: ' + data.Message);
break;
default:
messageElement.html('Unexpected Error.');
}
}
</script>
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