Set dropdown text selected from textbox value

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In some cases we need to set dropdown list items exact text by matching the value entered in textbox. For that purpose we can use .keyup event in jQuery. In .keyup event simply take the value of textbox and assign that value to the value of dropdown. Once you set value it's corresponding text will be get displayed as selected.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
     <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <title>Get dropdown value</title>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#topics").keyup(function () {
                var value = $("#topics").val();
                if (value == "" || isNaN(value))
                    value = 0;
                $("#topics1").val(value);
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox runat="server" ID="topics"></asp:TextBox>
    <br/><br/>
      <asp:DropDownList ID="topics1" runat="server">
     <asp:ListItem Text="--Select--" Value="0"></asp:ListItem>
    <asp:ListItem Text="C#" Value="1"></asp:ListItem>
    <asp:ListItem Text="jQuery" Value="2"></asp:ListItem>
    <asp:ListItem Text="ASP.NET" Value="3"></asp:ListItem>
    </asp:DropDownList>
    </div>
    </form>
</body>
</html>

Note: You may need some additional validations if user enters data in textbox that does not match to the values in dropdown. Ex. I have just validated in above code if user enters characters other than number using IsNaN


jQuery templates

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jQuery templates is a useful plugin developed by Microsofts's ASP.NET team in collaboration with jquery open source team. Templates helps you to manipulate the data at client side and display in browser. It is more useful to display the dataset that is fetched from database using client side Asynch Ajax call.

jQuery Template example

In order to use jQuery templates we either need to download "jquery.tmpl.js" plugin and add reference or we can also refer it from cdn. 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
     <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
     <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jquery.templates/beta1/jquery.tmpl.js"></script>
  <script type="text/javascript">

      $(document).ready(function () {
          debugger;
          var loc = window.location.href;
          $.ajax({
              type: 'POST',
              url: loc + "/GetBookList",
              data: "{}",
              contentType: "application/json; charset=utf-8"

          })
        .success(function (response) {
            debugger;
            $("#bookCollection").tmpl(response.d).appendTo(".book-container");
        })
        .error(function (response) {
            alert(response.d);
        });

      });
  </script>
</head>
<body>
    <form id="form1" runat="server">
    <div class="book-container">
    
    </div>
     <script id="bookCollection" type="text/x-jQuery-tmpl">
        <div>
           <h2>${Title}</h2>
            Author: ${Author}
            price: ${Price}
        </div>
    </script>
    </form>
</body>
</html>
Here in above code below script is template to which we are going to bind the data. <script id="bookCollection" type="text/x-jQuery-tmpl"> <div> <h2>${Title}</h2> Author: ${Author} price: ${Price} </div> </script> And by using $("#bookCollection").tmpl(response.d).appendTo(".book-container"); we actually bind the data to the template and append that template to some fixed html like div.


Below code is for reference to get data from code behind method: 


 [WebMethod]
        public static List GetBookList()
        {

            return new List()
                       {
                           new Book {Title = "ASP.NET", Author = "Stephen", Price = 350.9},
                           new Book {Title = "WPF", Author = "Murli", Price = 400},
                           new Book {Title = "WCF", Author = "Avinash", Price = 350}
                       };
        }
Refer link to know how to make a ajax call to code behind.