DotNetSlackers Latest ASP.NET News in Category Ajax

CRUD Operation in ASP.NET Web Applications Using HTTP Handler and jQuery

The Code Project Latest Articles — Sun, 20 May 2012 00:00:00 GMT

Easy approach to implement AJAX in ASP.NET without using an AJAX control...

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An Example to Use jQuery Global AJAX Event Handlers

The Code Project Latest Articles — Fri, 11 May 2012 00:00:00 GMT

This article presents an example to use jQuery global AJAX event handlers....

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Passing multiple POST parameters to Web API Controller Methods

Rick Strahls WebLog — Wed, 09 May 2012 00:00:00 GMT

ASP.NET Web API introduces a new API for creating REST APIs and making AJAX callbacks to the server. This new API provides a host of new great functionality that unifies many of the features of many of the various AJAX/REST APIs that Microsoft created before it - ASP.NET AJAX, WCF REST specifically - and combines them into a whole more consistent API. Web API addresses many of the concerns that developers had with these older APIs, namely that it was very difficult to build consistent REST style...

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Ajax Cascading DropDownList With GridView

The Code Project Latest Articles — Thu, 26 Apr 2012 00:00:00 GMT

This is an alternative for "Ajax Cascading DropDownList With GridView"...

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Take a Walk on the Client Side with WebAPI and WebForms

the telerik blogs — Thu, 26 Apr 2012 00:00:00 GMT

In my last blog I introduced the basics of using ASP.NET AJAX and WebAPI together in the same project. In addition, I showed how to bind results from WebAPI to a Teleriks ASP.NET AJAX Grid. In this blog I will continue down this path and implement insert, update, and delete operations using WebAPI and RadGrid!

Note: While this post focuses on using WebAPI in conjunction with RadGrid, most of the client code can be used when working with RadGrid in client mode.

Set It Up!

To get started an additional reference needs to be added to the project:

System.Net.Http.Formatting

Adding this reference allows us to use HttpResponseMessage<T>, which will be used to return data to the client.

Now on to the fun stuff!

Let There Be Customers!

Customers cant be updated or deleted if they dont exist; so I will start off by building a way to create customers.

Creating customers requires:

A Post action method in the controller to create a customer.

A button in the UI to create a new customer.

A form to enter customer information.

A way to submit the new customers information to the server.

A way to refresh the grid to show the new customer.

Starting with step one, I am going to create the Post method in the CustomerController as shown here:

public HttpResponseMessage Post(Customer newCustomer)

    repository.Add(newCustomer);

    repository.Save();

    var response = new HttpResponseMessage<Customer>(newCustomer, HttpStatusCode.Created);

    response.Headers.Location = new Uri(Request.RequestUri, "/api/customers/" + newCustomer.Id.ToString());

 return response;

This method adds a new customer to the repository, saves the customer, and then returns a new HttpResponseMessage<Customer>. The response message passes the created customer in its body, and returns a status code of 201 Created. The 201 status code indicates to the client that the new resource was actually created. We will look at how to handle that client side in a moment.

Before we can focus on client code, the UI needs to be setup. The first thing to do is add a new command item in the grid header. This will be where a user clicks to add a new customer:

<CommandItemTemplate>

 <button onclick="addCustomer(); return false;">Add New Customer</button>

</CommandItemTemplate>

Now I need a form for users to enter the new customer information. In this example I use Teleriks ASP.NET AJAX Window control to create a modal dialog, and add a form inside the dialog:

<telerik:RadWindow runat="server" ID="CustomerEditWindow" Modal="true">

 <ContentTemplate>

 <form id="customerInfoForm">

<p>

                Enter Customer Information:

 </p>

 <asp:HiddenField ID="customerId" runat="server" />

 <div>

 <asp:TextBox ID="customerFirstName" runat="server" /></div>

 <div>

 <asp:TextBox ID="customerLastName" runat="server" /></div>

 <div>

<asp:Button ID="btnCancelCustomer" Text="Cancel" CssClass="secondaryAction" runat="server" OnClientClick="closeCustomerEditor(); return false;" />

 <asp:Button ID="btnSaveCustomer" Text="Save" runat="server" CssClass="primaryAction" OnClientClick="saveCustomer(); return false;" />

 </div>

 </form>

 </ContentTemplate>

</telerik:RadWindow>

I went ahead and added an extra hidden field to store the customer id. This will be used later when implementing updates. I also created two buttons, one to submit the form, and one to cancel customer creation.

The last step to implementing customer creation is wiring everything up with JavaScript. When the Add Customer button in the grid header is pressed, an addCustomer JavaScript function is called. This JavaScript function simply shows the editor form, as shown here:

function addCustomer() {

   $find("<%=CustomerEditWindow.ClientID %>").show();

When the cancel button is clicked, the form needs to be cleared, and the window needs to be closed. This is handled by the closeCustomerEditor JavaScript function:

function closeCustomerEditor() {

 //close dialog

    $find("<%=CustomerEditWindow.ClientID %>").close();

 //reset form

    $get("<%= customerFirstName.ClientID %>").value = ";

    $get("<%= customerLastName.ClientID %>").value = ";

    $get("<%= customerId.ClientID %>").value = ";

When the submit button is pressed, the saveCustomer JavaScript function is called. In the saveCustomer function a client side customer object is created using the values from the form, and then the createResource function is called passing the customer object, and a callback function.

function saveCustomer() {

 var customer = {

        FirstName: $get("<%= customerFirstName.ClientID %>").value,

        LastName: $get("<%= customerLastName.ClientID %>").value,

        Id: $get("<%= customerId.ClientID %>").value

};

    closeCustomerEditor();

    createResource(customer, refreshGrid);

The createResource method sends an AJAX POST containing the new customers information to the Post action created earlier. If everything goes as expected the server will return a 204 Created result, and the callback function will be executed.

function createResource(model, success) {

    $.ajax({

        url: baseUrl,

        data: model,

        type: "POST",

        statusCode: {

            201: function (newResource) {

 if (success) {

                    success(newResource);

});

At this point customers can be created, and its time to implement editing!

Oh No, I Miss Spelled His Name!

At this point we can move on to editing a customer. Updating a customer is very similar to creating a new one.

The main differences are:

The form needs to be pre-populated with the edited customers information.

When sending the updated information to the server the PUT verb should be used.

Lets dig in!

The first thing needed here, is a way to retrieve a customer by its id from the server. For this I will create a new action method on the CustomerController named Get, and it will take a single parameter named id. The Get method will attempt to retrieve a customer based on the specified id, and if one is found, the server will return a new HttpResponseMessage<Customer> with a status code of 200 - OK. If no customer is found, it should throw a new HttpResponseException, and use the 404 Not Found status.

public HttpResponseMessage Get(int id)

  HttpResponseMessage response;

  var customer = repository.GetById(id);

 if (customer == null)

 throw new HttpResponseException("Invalid Customer", HttpStatusCode.NotFound);

 else

      response = new HttpResponseMessage<Customer>(customer, HttpStatusCode.OK);

 return response;

The next step is to create an action method in the CustomerController that will handle update operations for the customer resource. The Put method retrieves the customer by its id, updates it, and returns a HttpResponseMessage with a 200 OK status code if it was successful:

public HttpResponseMessage Put(Customer updatedCustomer)

    HttpResponseMessage response;

    var customer = repository.GetById(updatedCustomer.Id);

 if (customer == null)

 throw new HttpResponseException("Invalid Customer", HttpStatusCode.NotFound);

 else

        customer.FirstName = updatedCustomer.FirstName;

        customer.LastName = updatedCustomer.LastName;

        repository.Save();

        response = new HttpResponseMessage(HttpStatusCode.OK);

 return response;

Note 1: By convention WebAPI will automatically use a method that starts with Put to handle requests using the PUT verb. If you want to use a different method, simply add the [HttpPut] attribute to the method.

Note 2: If you want to add validation (everyone should! :)) please see the validation section below!

At this point the client-side needs to be wired up!

The first thing I need to do is add a new column to the grid, and then add a client side handler for grid commands.

Since the goal is to edit a customer, I added a column of type GridEditCommandColumn:

<telerik:GridEditCommandColumn ButtonType="ImageButton" ItemStyle-Width="20"/>

Next i configured the grids client events, and added a client side handler for OnCommand:

<ClientSettings ClientEvents-OnCommand="handleGridCommand">

 <DataBinding Location="~/api" ResponseType="JSON">

 <DataService TableName="Customers" Type="OData" />

 </DataBinding>

 <Scrolling AllowScroll="True" UseStaticHeaders="True" SaveScrollPosition="True" />

</ClientSettings>

Then I created a client method to handle the grid commands. The handleGridCommand function inspects the command, and if it is an edit command, the default grid action is cancelled, and the editCustomer client function is called:

function handleGridCommand(sender, args) {

 var command = args.get_commandName().toLowerCase();

 if (command == "edit") {

 //get the id for the data key for the command's row

 var customerId = getKeyValueByRowIndex(args.get_tableView(), args.get_commandArgument());

       editCustomer(customerId);

       args.set_cancel(true);

The editCustomer function, queries the service for the customer by its id, sets the forms input values, and shows the edit customer modal dialog using a few additional methods:

function editCustomer(id) {

    getResource(id, loadEditScreen)

function loadEditScreen(resource) {

    $get("<%= customerFirstName.ClientID %>").value = resource.FirstName;

    $get("<%= customerLastName.ClientID %>").value = resource.LastName;

    $get("<%= customerId.ClientID %>").value = resource.Id;

    $find("<%=CustomerEditWindow.ClientID %>").show();

function getResource(id, success) {

    $.ajax({

        url: baseUrl + '/' + id,

        type: "GET",

        dataType: 'JSON',

        statusCode: {

            200: function (resource) {

 if (success) {

                    success(resource);

});

At this point the user should see the modal dialog, populated with the customers information. Once they make some edits, and click the save button in the dialog, the saveCustomer JavaScript method is called just like when creating a customer; however, the method needs to be tweaked slightly to handle updating customers:

function saveCustomer() {

 var customer = {

        FirstName: $get("<%= customerFirstName.ClientID %>").value,

        LastName: $get("<%= customerLastName.ClientID %>").value,

        Id: $get("<%= customerId.ClientID %>").value

};

    closeCustomerEditor();

 if (customer.Id == '' || customer.Id == 0) {

        createResource(customer, refreshGrid);

 else {

        updateResource(customer, refreshGrid);

Now when saveCustomer is called the updateResource method will be called when saving an existing customer.

The updateResource method sends an AJAX request using the PUT Http verb. Using the PUT verb directs the controller to the Put action in the CustomersController. Once again, if everything goes as planed the server returns a status code of 200 OK, and the grid is refreshed:

function updateResource(model, success) {

  $.ajax({

      url: baseUrl + '/' + model.Id,

      data: model,

      type: "PUT",

      dataType:'JSON',

      statusCode: {

          200: function (resource) {

 if (success) {

                  success(resource);

});

Now we can fix any typo in a customers name, but what about when we need to remove a customer?!

Deleting Customers!

The final step in this journey is adding the ability to delete customers. Configuring deletes is very similar to the previous sections.

In this case I need to add the following:

A server side action on the controller to handle the delete.

A new column in the grid to display the delete button.

Some JavaScript to handle the client side delete command.

A grid refresh once the customer is deleted.

Once again, I will start off with step one and setup the server side code first! In the CustomersController I created a Delete action method. The Delete method attempts to retrieve a customer by the specified id, and if a valid customer is found, the server returns a 204 No Content status. If the specified customer was not found, we will throw a new HttpResponseException, set a message and use the 404 Not Found status.

public HttpResponseMessage Delete(int id)

   HttpResponseMessage response;

   var customer = repository.GetById(id);

 if (customer == null)

 throw new HttpResponseException("Invalid Customer", HttpStatusCode.NotFound);

 else

       repository.Remove(customer);

       repository.Save();

       response = new HttpResponseMessage(HttpStatusCode.NoContent);

 return response;

Now we need to configure the UI. First I will add a new column to the grid, except this time I will add a GridClientDeleteColumn:

<telerik:GridClientDeleteColumn ButtonType="ImageButton" ItemStyle-Width="20"/>

Now I need to update the handleGridCommand to make it handle the delete command as well:

function handleGridCommand(sender, args) {

 var command = args.get_commandName().toLowerCase();

 if (command == "delete" || command == "edit") {

 //get the id for the data key for the command's row

 var customerId = getKeyValueByRowIndex(args.get_tableView(), args.get_commandArgument());

 if (command == "delete") {

           deleteResource(customerId, refreshGrid);

 else {

           editCustomer(customerId);

       args.set_cancel(true);

Here I check to see if the command is the delete command, and if it is, I cancel the default grid command, and call the deleteResource JavaScript method. The deleteResource method send an AJAX request to the server using the Http Delete verb. If the server returns a status code of 204, we know the delete was successful, and call the success callback function (if it was passed in).

function deleteResource(id, success, fail) {

    $.ajax({

        url: baseUrl + '/' + id,

        type: "DELETE",

        statusCode: {

            204: function () {

 if (success) {

                    success();

});

At this point delete operations should be working!

In Action

Now the fun part, seeing if it all works! Go ahead and run the application, and you should see the grid populated with some customers (I like this store apparently):

Now open your favorite developer tools, create/update/delete some customers, and inspect the network traffic:

As you can see highlighted in red, everything is working as expected!

Validating the Request

In this blog I did not really cover validating the data model other than checking to see if valid ids were sent to the server. That said, the way the controller, and client code, is configured it is rather easy to return different status codes, and include the validation errors in the response. This will allow you to leverage data annotations applied to your objects.

As an example, if I applied an attribute to the Customer entity, and the data sent to the server was invalid, I could return ModelValidation errors like this:

if (!ModelState.IsValid)

 return new HttpResponseMessage<JsonValue>(ModelState.ToJson(), HttpStatusCode.BadRequest);

The ToJson method serializes the model errors to JSON, and the controller returns a new HttpResponseMessage<JsonValue> with a status code of 400 Bad Request.

ToJson Extension method:

public static class ModalStateHelpers

 public static JsonArray ToJson(this ModelStateDictionary modalState)

        var errors = new JsonArray();

 foreach (var prop in modalState.Values)

 if (prop.Errors.Any())

                errors.Add(prop.Errors.First().ErrorMessage);

 return errors;

The client can then handle this status code, and show the errors to these errors to the user:

function showErrors(errors) {

    var strErrors = ";

 if ($.isArray(errors)) {

        $.each(errors, function (index, err) {

            strErrors += "*" + err + "\n";

});

 else {

        strErrors = errors;

    alert(strErrors);

};

While I didnt go in-depth about validation in this article, the sample code does have data attributes applied to the Customer object, and validation is handled; so make sure to check it out! :)

That's a Wrap!

Wow, this blog came out quite a bit longer than I expected! That said, hopefully it will help you get started using ASP.NET AJAX, and WebAPI!

Download Source

Happy Coding!

CodeProject

About the author

Joshua Holt

Joshua Holt works as a Developer Support Specialist at Telerik focusing on ASP.NET, but tends to dabble in all of the products. Part of his role at Telerik is to work closely with the team, and help developers leverage the Telerik product line up. In his free time he likes to tinker with spatial data visualization projects, and chase clouds. Prior to working at Telerik, Joshua worked as a consultant for several Fortune 500 companies in the oil and gas industry.

@jholt456

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Calling Web Services Using AJAX

Black Belt Coder Article Feed — Sun, 15 Apr 2012 00:00:00 GMT

This article presents code that uses AJAX to contact the server from client-side script and get a response without refreshing the current page....

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Kinect Bing Map AJAX Control 6.3 with WPF

The Code Project Latest Articles — Sun, 08 Apr 2012 00:00:00 GMT

Kinect Bing Map Ajax Control 6.3 - 3D, Streetside and Bird Eye with WPF Webrowser Control...

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Simple AJAX POST Form and AJAX Fetch Link to Modal Popup

The Code Project Latest Articles — Fri, 09 Mar 2012 00:00:00 GMT

Post a form using Ajax and Get/Load your links to ajax modal popup. Sample for basic XML Ajax chater....

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New Sample Application Available for ASP.NET AJAX Image Gallery

the telerik blogs — Fri, 24 Feb 2012 00:00:00 GMT

An image gallery is a popular feature in a website, so we decided to demonstrate how easy and quick it is to build a gallery with the RadControls for ASP.NET AJAX and OpenAccess ORM. The finished app is compatible not only with the latest desktop browsers, but also with the major mobile ones.

The list of images on the main page was a perfect opportunity to show off the new client-side data-binding of our RadListView control. To get the data to the browser, we settled on a WCF Web Service. The same approach is used for populating the images in a RadGrid for an alternate view of the gallery.

Details for each image are displayed in a separate page that allows rating and sharing the picture with your friends through the most popular social networks. This is easily done via the RadRating and RadSocialShare controls, which are designed specifically for such scenarios. A RadRotator above the picture provides an intuitive navigation throughout the gallery. All of these features integrate seamlessly with RadAjax for a lightning fast user experience.

You can add your own images to the gallery in no time as well via the RadAsyncUpload control. A client-side preview is implemented on the Upload page so you can easily fill up the pictures information.before inserting it in the gallery. Open Access ORM provides easy and smooth communication with the stored information in the database throughout the entire application.

We also wanted to show how easily the default appearance of the RadControls can be changed, so we prepared entirely new styles with heavy use of CSS3 to give the Image Gallery a unique and modern look.

Click (or tap :) ) here to see the application online. We hope you will enjoy it! Like all our other samples, the source code is available for download as well - click here to get it.

About the author

Stoyan Stratev

Stoyan Stratev is the team lead of one of Teleriks ASP.NET AJAX teams. He joined the company in 2005 as a web developer and ever since he has been specializing in the integration of the Telerik components in third-party solutions, such as DotNetNuke and SharePoint. His main interests are the client side of web development and his team is responsible for the oldest Teleriks product the RadEditor.

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Formatting content with RadEditor for ASP.NET AJAX just became easier

the telerik blogs — Mon, 13 Feb 2012 00:00:00 GMT

One of the new features coming up in Q1 2012 for the RadEditor control is a new drop-down tool called "Format sets". We hope that this new editor command will make styling your content faster and easier. In its essence, the format sets drop-down combines the features of two existing editor tools - the paragraph styles and the apply CSS class and adds a new way to apply formatting to content.

The new tool will help you immensely if your site has a lot of CSS styles and it takes a long time to find the right one each time. It features three sets (groups) - Element, Inline, and Block. The Element set is contextual - what you see there will depend on the currently selected element in the editor. In the screenshot above an image is selected, so the Element set shows image related formatting. If the currently selected element has no formatting defined, the tool will show element formatting for the closest ancestor element of the currently selected one that has a defined set. For example selecting text in a table cell will show the table cell formatting options. The Inline formatting set will show options very similar to the ones you have in the Apply CSS class drop-down. Finally, the Block format set will show options the same as the Paragraph styles tool.

You can define what is shown in the new drop-down from three different places - from the editor tools file (ToolsFile.xml), from the editor declaration (.aspx or .ascx file), and from code (C#,VB). For more information about the Format Sets drop-down, visit our online documentation at Format Sets help

An online demo is also available right now, where you can see the new editor functionality in action. Download the Q1 2012 beta or head over to our demo server http://demos.telerik.com/aspnet-ajax-beta/editor/examples/formatsets/defaultcs.aspx.

About the author

Stoyan Stratev

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AJAX Chat Application

The Code Project Latest Articles — Sun, 12 Feb 2012 00:00:00 GMT

The project illustrates how to design a simple AJAX web chat application....

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Hacking the browser cache with JQuery and ASP.NET MVC

Pablo M. Cibraro (aka Cibrax) — Fri, 10 Feb 2012 00:00:00 GMT

Although JQuery provides a very good support for caching responses from AJAX calls in the browser, it is always good to know how you can use http as protocol for making an effective use of it. The first thing you need to do on the server side is to supports HTTP GETs, and identify your resources with different URLs for retrieving the data (The resource in this case could be just a MVC action). If you use the same URL for retrieving different resource representations, you are doing it wrong. An HTTP...

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The rise of Simple Page Applications (SPA) in Web Mobile

Pablo M. Cibraro (aka Cibrax) — Fri, 27 Jan 2012 00:00:00 GMT

Limited connectivity is one of the main challenges in web mobile. The stateless nature of http causes that content and associated static files like scripts or images be transmitted over the wire every time a page is fully refreshed (assuming http caching is not implemented correctly). Diverse techniques have emerged over the years to solve part of that problem by using the browser AJAX support. One of these techniques, which drastically changed the way we develop web applications is know...

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ASP .NET Image Slider with fancy thumbnail hover effect

The Code Project Latest Articles — Wed, 25 Jan 2012 00:00:00 GMT

This article aims to show that ASP .NET combined with jQuery/Ajax/Javascript produces user friendly and attractive websites....

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Asynchronous File Upload

The Code Project Latest Articles — Wed, 25 Jan 2012 00:00:00 GMT

An Ajax control that enables a user to upload a file asynchronously with extra data...

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Disable Label after some amount of time

The Code Project Latest Articles — Wed, 25 Jan 2012 00:00:00 GMT

Achieve the same using AJAX AnimationExtender Control. Use the below code in your code behind.lbl.Text = "Assign......

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ScriptArguments: An easy way to programmatically pass arguments to script from codebehind

The Code Project Latest Articles — Sat, 14 Jan 2012 00:00:00 GMT

During my on-going adventures AJAXifying a crusty old business app I have been using a methodology by which most client events are setup in codebehind. The reason for this is I have easy access to my client ids, variables, and resources in codebehind....

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Use AjaxManager to Generate JavaScript that calls the Server-Side Method

The Code Project Latest Articles — Sat, 10 Dec 2011 00:00:00 GMT

Use AjaxManager to Generate JavaScript that calls the Server-Side Method...

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How To Invoke the JavaScript Console on Your iPad

Chris Love's Official Blog - Professional ASP.NET — Fri, 18 Nov 2011 00:00:00 GMT

Debugging AJAX on a mobile device is tricky at best. There are no Firebug or F12 tools available. This means we do not have a nice way to set break points or step through our code when there is an error. Not to mention how do you even know when there...(read more)...

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ASP.NET AJAX Release History : Q3 2011 (version 2011.3.1115)

Telerik News RSS Feed — Wed, 16 Nov 2011 00:00:00 GMT

New Controls Org Chart - organization chart control with flexible rendering capabilities (rendered fields, templates, grouping in nodes, etc.), xml export/import functionality and data-binding to a variety of data sources. Social Share - intuitively configurable widget for effortless content sharing via different social networks. Easy to be configured and customized, with multi-tracker Google Analytics support and optional 'Send email' form. Common for all controls What's New Added: New...

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