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The AutoComplete Extender
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The AutoComplete extender attaches to a standard ASP .NET TextBox . As the end user types text in the TextBox, the AutoComplete extender calls a Web service to look up candidate entries based on the results of the Web service call . The following example borrows a component from 15, Application Data Caching the quotes collection containing a number of famous quotes by various people .
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Using the AutoComplete extender
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. 1 . . Add a new page to AJAXORama . Because this page will host the AutoComplete extender, name it UseAutocompleteExtender .
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Part V
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2 . . Add an instance of the ScriptManager control to the page you just added . 3 . . Borrow the QuotesCollection class from 15 . Remember, the class derives from System.Data.Table and holds a collection of famous quotes and their originators . You can add the component to AJAXORama by right-clicking the project node, selecting Add Existing Item, and locating the QuotesCollection .cs file associated with the UseDataCaching example in 15 . 4 . . Add a method to retrieve the quotes based on the last name . The method should accept the last name of the originator as a string parameter . The System.Data.DataView class you use for retrieving a specific quote is useful for performing queries on a table in memory . The method should return the quotes as a list of strings . There might be none, one, or many, depending on the selected quote author . You use this function shortly .
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using using using using using using using using using using System; System.Data; System.Configuration; System.Web; System.Web.Security; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.WebControls.WebParts; System.Web.UI.HtmlControls; System.Collections.Generic;
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/// <summary> /// Summary description for QuotesCollection /// </summary> public class QuotesCollection : DataTable { public QuotesCollection() { } public void Synthesize() { this.TableName = Quotations ; DataRow dr; Columns.Add(new DataColumn( Quote , typeof(string))); Columns.Add(new DataColumn( OriginatorLastName , typeof(string))); Columns.Add(new DataColumn(@ OriginatorFirstName , typeof(string))); dr = this.NewRow(); dr[0] = Imagination is more important than knowledge. ; dr[1] = Einstein ; dr[2] = Albert ; Rows.Add(dr);
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23 AJAX
} // Other quotes added here...
public string[] GetQuotesByLastName(string strLastName) { List<string> list = new List<string>(); DataView dvQuotes = new DataView(this); string strFilter = String.Format( OriginatorLastName = {0} , strLastName); dvQuotes.RowFilter = strFilter; foreach (DataRowView drv in dvQuotes) { string strQuote = drv[ Quote ].ToString(); } } list.Add(strQuote);
return list.ToArray();
5 . . Add a class named QuotesManager to the project . The class manages caching . The caching example from which this code is borrowed stores and retrieves the QuotesCollection during the Page_Load event . Because the QuotesCollection will be used within a Web service, the caching has to happen elsewhere . To do this, add a public static method named GetQuotesFromCache to retrieve the QuotesCollection from the cache:
using using using using System; System.Collections.Generic; System.Linq; System.Web;
/// <summary> /// Summary description for QuotesManager /// </summary> public class QuotesManager { public QuotesManager() { } public static QuotesCollection GetQuotesFromCache() { QuotesCollection quotes;
Part V
Dynamic Data, XBAP, MVC, AJAX, and Silverlight
quotes = (QuotesCollection)HttpContext.Current.Cache[ quotes ]; if (quotes == null) { quotes = new QuotesCollection(); quotes.Synthesize(); } return quotes;
6 . . Add an XML Web Service to your application . Right-click the project and add an ASMX file to your application . Name the service QuoteService . You can remove the WebService and WebServiceBinding attributes, but be sure to adorn the XML Web Service class with the [System.Web.Script.Services.ScriptService] attribute by uncommenting it (Visual Studio put it in for you) . That way, it is available to the AutoComplete extender later on . The AutoCompleteExtender uses the XML Web Service to populate its drop-down list box . 7 . . Add a method to get the last names of the quote originators that s the method that populates the drop-down box . The method should take a string representing the text already typed in as the first parameter, an integer representing the maximum number of strings to return . Grab the QuotesCollection from the cache using the QuoteManager s static method GetQuotesFromCache . Use the QuotesCollection to get the rows from the QuotesCollection . Finally, iterate through the rows and add the originator s last name to the list of strings to be returned if it starts with the prefix passed in as the parameter . The Common Language Runtime (CLR) String type includes a method named StartsWith that s useful to figure out whether a string starts with a certain prefix . Note that you also have to add using statements for generic collections and data as shown:
using using using using using using using System; System.Linq; System.Web; System.Collections.Generic; System.Linq; System.Web; System.Web.Services;
using System.Data; [System.Web.Script.Services.ScriptService] public class QuoteService : System.Web.Services.WebService {
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