Adding a New Row In The Razor WebGrid

The Razor WebGrid isn't just used for displaying data. I have already looked at how to edit data inline within the WebGrid, so this article looks at how to add new rows of data. within a rendered grid.

This article kind of follows on from the Inline Editing with the WebGrid post I published previously in that it offers a way for the user to add new records without leaving the confines of the WebGrid. The solution shares other similarities in that it relies on jQuery. Here's the WebGrid . It obtains data from a database of books and displays that without paging or sorting enabled:

@{
   var db = Database.Open("Books");
   var commandText = string.Empty;
   if(IsPost){
       commandText = @"INSERT INTO Books (Title, ISBN, AuthorId, CategoryId, Price) VALUES (@0, @1, @2, @3, @4)";
       var title = Request["title"];
       var isbn = Request["isbn"];
       var authorId = Request["authorId"];
       var categoryId = Request["categoryId"];
       var price = Request["price"];
       db.Execute(commandText, title, isbn, authorId, categoryId, price);
   }
   commandText = @"SELECT Title, ISBN, FirstName + ' ' + LastName As Author, Category, Price 
                 FROM Books
                 INNER JOIN Authors ON Books.AuthorId = Authors.AuthorId
                 INNER JOIN Categories ON Books.CategoryId = Categories.CategoryId";
   var books = db.Query(commandText);
   var grid = new WebGrid(books, canPage: false, canSort:false);
}
<form method="post">
    @grid.GetHtml(columns: grid.Columns(grid.Column("Title", style: "title"),
                                        grid.Column("ISBN", style: "isbn"),
                                        grid.Column("Author", style: "author"),
                                        grid.Column("Category", style: "category"),
                                        grid.Column("Price", style: "price", format: @<text>@item.Price.ToString("c")</text>)))
</form>
<button id="add">Add</button>

There are two things to comment on. First, the grid is wrapped in a form. Second, there is a block of code that executes if the form is posted. It inserts a new record into the database. However, there are no form fields at the moment. These are added by some jQuery code when the Add button is clicked:

@section script{
<script type="text/javascript">
    $(function () {
        $('#add').on('click', function () {
            $('table').append('<tr>' +
                    '<td><input name=\'title\' id=\'title\' /></td>' +
                    '<td><input name=\'isbn\' id=\'isbn\' /></td>' +
                    '<td><select name=\'authorId\' id=\'authorId\'></select></td>' +
                    '<td><select name=\'categoryId\' id=\'categoryId\'></select></td>' +
                    '<td><input name=\'price\' id=\'price\' /></td>' +
                    '</tr><tr><td colspan=\'5\'><button>Save</button></td>');
             $.getJSON('/GetData/Authors', function (authors) {
                $('#authorId').append(
                        $('<option/>')
                            .attr('value', '')
                            .text('-- Select Author --'));
                $.each(authors, function (index, author) {
                    $('#authorId').append(
                        $('<option/>')
                            .attr('value', author.AuthorId)
                            .text(author.Author)
                    );
                });
            });
             $.getJSON('/GetData/Categories', function (categories) {
                $('#categoryId').append(
                        $('<option/>')
                            .attr('value', '')
                            .text('-- Select Category --'));
                $.each(categories, function (index, category) {
                    $('#categoryId').append(
                        $('<option/>')
                            .attr('value', category.CategoryId)
                            .text(category.Category)
                    );
                });
            });
            $('#add').hide();
        });
    });
</script>
}

When the Add button is clicked, an extra row is added to the table that the WebGrid generates. It consists of a collection of inputs and dropdowns. Since this is added to the table, it becomes part of the form. A Save buttion is also provided and the Add button is hidden so that users can't create multiple rows.

webgrid row

The dropdown lists are populated by AJAX requests that obtain JSON from a file designed specifically for that purpose:

@{
    Layout = null;
    Response.ContentType = "application/json";
    var db = Database.Open("Books");
    var commandText = "";
    switch (UrlData[0]){
        case "Authors":
            commandText = @"SELECT AuthorId, FirstName + ' ' + LastName As Author FROM Authors";
            break;
        case "Categories":
            commandText = @"SELECT CategoryId, Category FROM Categories";
            break;
    }
     var data = db.Query(commandText);
    Json.Write(data, Response.Output); 
}

The Layout is set to null to prevent any additional HTML from interfering with the response and the content type of the response is set to application/json. Depending on the value passed in to UIrlData[0] (the last segment of the AJAX request url), the SQL is set to retrieve either authors or categories. The resulting data is then converted to JSON using the JSON helper and sent to the browser.

Now all the user has to do is to fill in some data in the form and click the Save button. The current code lacks any kind of input validation but that isn't the focus of this article. If you want to learn more about how to validate form fields, you can refer to Validation In Razor Web Pages 2. Otherwise this article has shown a simple way to extend the Razor WebGrid to include the ability to add new data through it.

 

Date Posted: Thursday, January 23, 2014 8:10 AM
Last Updated:
Posted by: Mikesdotnetting
Total Views to date: 22986

2 Comments

Thursday, April 17, 2014 4:09 PM - Saeed

Thank you Mike. I really enjoy your articles. They help me so much.

Saturday, September 20, 2014 8:42 PM - Prakash

This is very good article. Please send me more articles like this.
Add your comment

If you have any comments to make about this article, please use this form to do so. Make sure that your comment relates specifically to the article above. More general comments can be posted through the form on the Contact page.

Please note, all comments are moderated, and some may not be published. The kind of things that will ensure your comment is deleted without ever seeing the light of day are as follows:

  • Not relevant to the article
  • Gratuitous links to your own site or product
  • Anything abusive or libellous
  • Spam
  • Anything in a language I don't understand including gibberish.

I do not pass email addresses on to spammers, so a valid one will assist me in responding to you personally if required.

Recent Comments

stephen 1/28/2015 9:53 PM
In response to ASP.NET MVC 5 with EF 6 - Working With Files
Hi, Sorry for wasting your time, I had a comment <!--Images--> inside the form this stopped it from...

stephen 1/28/2015 9:47 PM
In response to ASP.NET MVC 5 with EF 6 - Working With Files
Everything has been ok up until this part, here's a snippet of the entire file but i removed lines =...

Stephen kenny 1/28/2015 8:26 PM
In response to ASP.NET MVC 5 with EF 6 - Working With Files
Hi, great article. My issue is with the create view. @using (Html.BeginForm("Create", "Reptiles",...

Jenelyn 1/27/2015 6:44 PM
In response to MVC 5 with EF 6 in Visual Basic - Implementing Basic CRUD Functionality
I'm searching CRUD using VB.net 2010 and I can't find any, how sad...

Kadu Portugal 1/23/2015 10:55 AM
In response to Scheduled Tasks In ASP.NET With Quartz.Net
Hi Mike, Thank you for your useful article. I implement it in my project, and everything run...

Satyabrata 1/23/2015 6:02 AM
In response to Usage of the @ (at) sign in ASP.NET
Refreshed a lot of things.Thanks...

Vo Thanh Chinh Trung 1/22/2015 4:30 PM
In response to Adding A View
It's very helpful...Thank you so much, Mikes!...

Joop Stringer 1/22/2015 12:00 PM
In response to Inline Editing With The WebGrid
How to add a row for a new record ?...

Gaetan C 1/21/2015 8:49 PM
In response to Looking At The WebMatrix WebGrid
I use the webgrid very often and I Wonder if it's possible to merge to different sql query into on...

Teresa 1/19/2015 3:08 PM
In response to MVC 5 with EF 6 in Visual Basic - Creating an Entity Framework Data Model
At the top, the first thing you write is "Open Visual Studio and create a new C# Web project named I...