I have an asp.net WebMethod that returns an XmlDocument object.
I can successfully call the method using jquery ajax, but can't seem to get the function to succeed (server side webmethod gets called with correct parameters but client side method fails with 'undefined parser error').
To reproduce, Asp.net C#:
[WebMethod]
public static XmlDocument test(string name)
{
XmlDocument result = new XmlDocument();
XmlElement root = result.CreateElement("Data");
result.AppendChild(root);
XmlElement element = result.CreateElement("AnElement");
element.SetAttribute("Name", name);
root.AppendChild(element);
return result;
}
JavaScript:
function CallForData(name) {
$.ajax({
type: "POST",
url: "AppName.aspx/test",
data: "{'name': " + name+ "'}",
contentType: "application/json; charset=utf-8",
dataType: "xml",
success: function (response) { ParseXML(response); },
error: function (data, textStat, req) { alert(data + ' - ' + textStat + ' - ' + req); }
});
}
If dataType: "xml" is commented out (automatic) the success function is called but the data is a load of square brackets that seem to indicate an empty json structure.
I want an XML response that I can parse using jQuery.
I think I possibly need to add some format identification to the XML document but aren't sure. Can anyone point out the problem?
Fixed by adding
[System.Web.Script.Services.ScriptMethod(ResponseFormat=System.Web.Script.Services.ResponseFormat.Xml)]
to the web method.
Credit to riteshtandon23 in
this thread
Related
I would like consume cross-domain web-service from client with jquery.here is my code
function getId() {
var testid = ($('#<%=PreviousTest.ClientID %> OPTION:selected').val());
jQuery.support.cors = true;
jQuery.ajax({
type: "POST",
url: "../FalconWebService.asmx/minlatency",
data: "{'testId':" + testid + "}",
contentType: "application/json; charset=utf-8",
dataType:"json",
success: function (data) {
alert("catch");
var msg = jQuery.parseJSON(data.Table);
return msg;
},
Error: function () {
alert("error");
}
my webservice returns values in this format
{"Table":[{"minlatency":16.0,"Time":"/Date(1328248782660+0530)/"},{"minlatency":7.0,"Time":"/Date(1328248784677+0530)/"},{"minlatency":13.0,"Time":"/Date(1328248786690+0530)/"},{"minlatency":6.0,"Time":"/Date(1328248788690+0530)/"},{"minlatency":20.0,"Time":"/Date(1328248790707+0530)/"},{"minlatency":12.0,"Time":"/Date(1328248792723+0530)/"},{"minlatency":26.0,"Time":"/Date(1328248794723+0530)/"},{"minlatency":18.0,"Time":"/Date(1328248796723+0530)/"}]}
Calls in cross-domain work in a different way. They create dynamic javascripts that are inserted to the page using a callback function. This function is used to handle the response from the service. The Jquery calls add a "?callback=?" to the URL of the service, where "callback" is the name of the function that will be inserted.
To call cross-domain services with JQuery you have to do the following:
jQuery.ajax({
type: "POST",
url: "../FalconWebService.asmx/minlatency",
data: "{'testId':" + testid + "}",
contentType: "application/json; charset=utf-8",
dataType: "jsonp", //The data type that you must use is JSONP. Basically tells JQuery that the request is cross-domain
success: function (data) {
alert("catch");
var msg = jQuery.parseJSON(data.Table);
return msg;
},
Error: function () {
alert("error");
},
jsonpCallback: 'callback' //Dude to the fact that the JS is being generated dynamicaly, this tells JQuery to use the name "callback" for the function that will handle the result, as it adds "?callback=?" to the URL
});
You could also use "jsonp" instead of "jsonpCallback" if you want to "override the callback function name in a jsonp request" (from JQuery).
It worked for me (in WCF REST services which communicate with JSON messages, but it should work the same way in your case). This is all explained in the JQuery Ajax documentation.
Hope this helps.
This is probably a very simple task to perform but I'm taking the risk to ask anyway.
I have an object variable that looks like this:
var MyObj = {"Param1": "Default",
"Param2": "test",
"Param3": 3 };
I'm using ASP.net and I'm looking to pass this object to a page method via jquery.
So far, I have this javascript code:
function LoadObject () {
var TheObject = MyObj.toString();
$.ajax({
type: "POST",
url: "../Pages/TestPage.aspx/GetCount",
data: TheObject,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: successFn,
error: errorFn
});
};
I have a page method set up in the .cs file and I put a breakpoint in it but it never gets there; nothing happens.
Please let me know what changes I need to make to get this to work.
Thanks.
You need to serialize TheObject into a JSON string, and ensure that the GetCount method accepts an object with the same signature as TheObject.
I use the jQuery.JSON library to do this so that my syntax becomes:
data: "{ methodParameterName: " + $.toJSON(TheObject) + " }"
I use this library, but you can acheive the same thing with any other library in a similar manner
The first thing that you need to know is that you need to match your method name with your url
for example if your method on your code behind is named "calculate", your url must be something like this "../Pages/TestPage.aspx/calculate"
other thing that you need to keep in mind is the parameters of your method, the names and the types of your parameters must match in you ajax call and your method (code behind)
if the sign of your method is something like this
[WebMethod]
public void Calculate(string data){
// your code here
}
Your ajax call must be like this:
function LoadObject () {
var objetoJson = {
data: JSON.stringify(MyObj)
};
$.ajax({
type: "POST",
url: "../Pages/TestPage.aspx/Calculate",
data: objetoJson ,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: successFn,
error: errorFn
});
};
This section is so important:
var objetoJson = {
data: JSON.stringify(MyObj)
};
the name "data" is the name of your parameter in your method (code behind) and "JSON.stringify" is a helper functions already defined on your browser to convert and object to string
Hope this helps
Take a look at this thread: JSON stringify missing from jQuery 1.4.1?
Abstract: jQuery doesn't have a native method to do it. But there are many plugins out there.
EDIT
Sample C# code receiving your JSON object:
[WebMethod]
public static int GetCount(GetCountParams p)
{
// ... Do something with p.Param1, p.Param2, etc.
return 0;
}
public class GetCountParams
{
public string Param1 { get; set; }
public string Param2 { get; set; }
public string Param3 { get; set; }
}
EDIT 2
Sample jQuery AJAX call using that object as parameter:
$.ajax({
type: "POST",
url: "../Pages/TestPage.aspx/GetCount",
data: "{ p: '" JSON.stringify(MyObj) + "' }",
contentType: "application/json; charset=utf-8",
dataType: "json"
});
Issue
I have an aspx page with jQuery code to send an ajax request over to an asmx web service file (on the same website). The response that comes back is not consistent, however, it consistently fires the "error" jQuery callback as opposed to the "success" call back. The status code inconsistently varies between 200, 12030, and 12031. The responseText of the message to the callback inconsistently varies between [blank] and the actual XML that the json webservice returns. I debugged the code, and the webservice does actually execute without any exceptions.
ASPX Code
//Code omitted for brevity
<script type="text/javascript">
jQuery(document).ready(function()
{
jQuery.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "CallDequeue.asmx/Dequeue",
data: "{}",
dataType: "json",
success: function(Msg)
{
alert('success:' + Msg.responseText);
},
error: function(Msg)
{
alert('failed:' + Msg.status + ':' + Msg.responseText);
}
});
});
</script>
//Code ommitted for brevity
Web Service Code
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
public class CallDequeue : System.Web.Services.WebService
{
[WebMethod]
public string Dequeue()
{
return "{\"d\":{\"FirstName\":\"Keivan\"}}";
}
}
When you mark the service as a ScriptService, it automatically handles the JSON serialization. You shouldn't manually serialize the response.
If you want the return to come back as "FirstName", then you can use a DTO class to control the syntax. Just returning a string, it would come back as {'d':'Keivan'} instead of {'d':{'FirstName':'Keivan'}}.
[ScriptService]
public class CallDequeue : System.Web.Services.WebService
{
public class PersonDTO
{
public string FirstName;
}
[WebMethod]
public PersonDTO Dequeue()
{
var p = new PersonDTO();
p.FirstName = "Keivan";
return p;
}
}
A few changes to the calling syntax:
jQuery(document).ready(function() {
jQuery.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "CallDequeue.asmx/Dequeue",
data: "{}",
dataType: "json",
success: function(Msg) {
// Unless you're using 2.0, the data comes back wrapped
// in a .d object.
//
// This would just be Msg.d if you return a string instead
// of the DTO.
alert('success:' + Msg.d.FirstName);
},
error: function(Msg) {
alert('failed:' + Msg.status + ':' + Msg.responseText);
}
});
});
You can read more about ASP.NET AJAX's .d wrapper here, if you're interested.
Update:
Using ASP.NET 2.0, you need to install the ASP.NET AJAX Extensions v1.0. Additionally, make sure your web.config is configured for ASP.NET AJAX (most specifically the HttpHandlers section).
This question will most likely help you.
Otherwise, I converted this web service to a page method and it worked immediately. Do you have that option?
CS:
public partial class test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
[WebMethod]
public static string Dequeue()
{
return "{\"d\":{\"FirstName\":\"Keivan\"}}";
}
}
ASPX:
<script type="text/javascript">
jQuery(document).ready(function()
{
jQuery.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "test.aspx/Dequeue",
data: "{}",
dataType: "json",
success: function(Msg)
{
alert('success:' + Msg.responseText);
},
error: function(Msg)
{
alert('failed:' + Msg.status + ':' + Msg.responseText);
}
});
});
Check this and other Encosia articles out for more information.
you say it's json, but it returns xml. i see a slight disconnect there.
Such a simple answer. My web.config wasn't ajax enabled so all calls (regardless of my webservice being a scriptservice) were returning XML instead of pure json.
Try marking up your web method with [ScriptMethod]
As in:
[WebMethod]
[ScriptMethod]
My thanks to all the responders here.
Be sure to add these attributes in front of the methods to be used
[WebMethod]
[ScriptMethod]
Not sure when the ScriptMethod is needed ?
Curiously, he did NOT have the [Script Service] and the [WebMethod] in his download code.
Anyway, the aJax 500 12030 12031 errors are gone after the above changes.
I have a test web service called: MySimpleService.svc with a method called:GetUserNamesByInitials. below is the Linq to SQL code:
[OperationContract]
public static string GetUserNamesByInitials(string initials)
{
string result = "";
//obtain the data source
var testDB = new TestDBDataContext();
//create the query
var query = from c in testDB.TestTables
where c.initials == initials
select c;
//execute the query
foreach (var c in query)
{
result = result + c.full_name;
}
return result;
}
I have used that code in page behind and it works well. However when i try to call it using jQuery I don't get any result, no errors nothing. below is the code i use in jQuery:
$('#TextBox3').live('keydown', function(e) {
var keyCode = e.keyCode || e.which;
if (keyCode == 9) {
e.preventDefault();
//call function here
$.ajax({
type: "POST",
url: "/MySimpleService.svc/GetUserNamesByInitials",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: '{"word":"' + $('#TextBox3').val() + '"}',
success: function(data) {
$('#TextBox4').val(data.d);
}
});
}
});
});
what I do is to type the user id in one textbox (TextBox3) and when I press the Tab key the result is shown in another textbox (TextBox4).
The jQuery call works well with other methods that do not call the database, for example using this other web service method it works:
[OperationContract]
public string ParameterizedConnectionTest(string word)
{
return string.Format("You entered the word: {0}", word);
}
However with the Linq method it just does not work. Maybe i am doing something wrong? thank you in advance.
The web service is expecting a string named "initials" and you're sending it a string called "word". More than likely it is throwing an exception that it's not being passed the expected parameter.
Try adding an error: function() in your $.ajax() call to catch the error. I would also suggest installing FireBug or Fiddler to be able to view and debug the AJAX request and response. Here's the updated $.ajax() call with the right parameter name and an error function which should invoke your chosen javascript debugger if you have it open:
$.ajax({
type: "POST",
url: "/MySimpleService.svc/GetUserNamesByInitials",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: '{"initials":"' + $('#TextBox3').val() + '"}',
success: function(data) {
$('#TextBox4').val(data.d);
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert('Error!');
debugger; // Will let you see the response in FireBug, IE8 debugger, etc.
}
});
Update
So I just noticed that you're using WCF services instead of normal ASP.Net (ASMX) services... Some additional suggestions:
Enable IncludeExceptionDetailInFaults in your web.config so that you can debug any errors happening. ASP.Net services will return an error by default but you need to explicitly turn this on for WCF.
Try adding an additional attribute below your [OperationContract] attribute to specify you're expecting a post with JSON data:
[WebInvoke(Method = "POST",BodyStyle=WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json)]
I have an ASP.NET application in which i want to post data using jQuery to another page. It means i want post the data of page.
How can i do this with jQuery or AJAX?
Please help me.
$(document).ready(function() {
alert("start");
$("#btnSave").click(function() {
alert("start1");
var aa = 'bb';
var json = "{'ItemName':'" + aa + "'}";
alert("start2");
var ajaxPage = "Default3.aspx?Save=1"; //this page is where data is to be retrieved and processed
alert("start3");
var options = {
type: "POST",
url: ajaxPage,
data: json,
contentType: "application/json;charset=utf-8",
dataType: "json",
async: false,
success: function(response) {
alert("success: " + response);
},
error: function(msg) { alert("failed: " + msg); }
};
alert("start4");
});
});
I am using this code I am getting all alert response but its posting page.
Jquery and JSON works great with ASP.NET. You can call a code behind method directly from javascript and return complex objects, not just string. (for this example to work you need json2.js found here https://github.com/douglascrockford/JSON-js)
//javascript
function postMethod(text){
var jsonText = JSON.stringify({ name:text });
$.ajax({
type: "POST",
url: "yourpage.aspx/GetPerson",
contentType: "application/json; charset=utf-8",
data: jsonText,
dataType: "json",
success: function(response) {
var person = response.d;
alert(person.Name);
}
});
}
//aspx code behind
[WebMethod]
public static Person GetPerson(string name)
{
Person person = new Person(name);
return person;
}
There is load function.
You may use it like this:
$('#somediv').load('http://someaddress',{key:value}, function callback(){});
Second parameter is important - only written in this way performs post.(if you pass array then it performs get)
PS> This is good when you want to read the data, if you want to just do the POST and don't care about what comes back then you may want to use:
http://docs.jquery.com/Ajax/jQuery.post#urldatacallbacktype
Look at $.post() - http://docs.jquery.com/Ajax/jQuery.post
Add all your relevant data, and post away, handling the response with the supplied callback method.
There is a post function in jQuery:
$.post("test.php", { name: "John", time: "2pm" } );
This is copied directly from the jQuery API, so for more details and examples you can look there.
jQuery api
choose Ajax > Ajax Requests > $.post