Building Custom Forms - ASP.NET Dynamic Data - page 342

Compared to the original version of this field template shown in Listing 10.11, the only
difference in the final markup of the Region field template is the addition of the
AutoPostBack and OnTextChanged attributes to the TextBox control. These changes actu-
ally implement the UnleashedFieldTemplate pattern and are not directly related to
moving the logic for determining Country field value out of this template.
LISTING 10.20 Final Version of the Region_Edit Field Template (Code-Behind)
using System;
using System.Collections.Specialized;
using System.Web.UI;
namespace WebApplication.DynamicData.FieldTemplates
{
public partial class RegionEditField : UnleashedFieldTemplate
{
public string Country
{
get { return this.autoCompleteExtender.ContextKey; }
set { this.autoCompleteExtender.ContextKey = value; }
}
public override Control DataControl
{
get { return this.textBox; }
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.textBox.ToolTip = this.Column.Description;
this.SetUpValidator(this.requiredFieldValidator);
this.SetUpValidator(this.dynamicValidator);
}
protected override void ExtractValues(IOrderedDictionary dictionary)
{
dictionary[this.Column.Name] = this.ConvertEditedValue(this.textBox.Text);
}
protected void TextBox_TextChanged(object sender, EventArgs e)
{
this.OnFieldValueChanged(e);
}
}
}