/// <summary>
/// This method is supposed to be called everytime the suggested list changes,
/// usually when the SelectedValueChanged event is fired
/// </summary>
public override void DataBind()
{
HtmlTextWriter writer = new HtmlTextWriter(new StringWriter());
int i = 0;
if (DataSource != null)
{
//Header template
if (HeaderTemplate != null)
{
AutoSuggestItem item = new AutoSuggestItem(-1, "", AutoSuggestItemType.Header);
HeaderTemplate.InstantiateIn(item);
//Fires the ItemDataBound event
if(ItemDataBound != null)
ItemDataBound(this, new AutoSuggestItemEventArgs(item));
if (item.Controls.Count > 0)
{
foreach (Control control in item.Controls)
{
control.RenderControl(writer);
}
}
}
//ItemTemplate
IEnumerator dataEnum = DataSource.GetEnumerator();
while (dataEnum.MoveNext())
{
// Find out if its an alternating item
AutoSuggestItemType itemType = (i + 1) % 2 == 0 ? AutoSuggestItemType.AlternatingItem : AutoSuggestItemType.Item;
//Creates the item
AutoSuggestItem item = new AutoSuggestItem(i, dataEnum.Current, itemType);
if(this.ItemTemplate != null)
this.ItemTemplate.InstantiateIn(item);
HtmlTextWriter w = new HtmlTextWriter(new StringWriter());
AutoSuggestMenuItem asbItem = new AutoSuggestMenuItem();
asbItem.CSSClass = this.MenuItemCSSClass;
item.DataBind();
//Fires the ItemDataBound event before rendering the item
if (ItemDataBound != null)
ItemDataBound(this, new AutoSuggestItemEventArgs(item));
item.RenderControl(w);
asbItem.Text = w.InnerWriter.ToString();
if (DataKeyField != "")
asbItem.Value = GetField(item, this.DataKeyField);
asbItem.TextBoxText = GetField(item, this.TextBoxDisplayField);
writer.WriteLine(asbItem.GenHtml(i + 1, this.TextBoxID));
this.Controls.Add(item);
i++;
}
}
string html = "";
if (i > 0)
{
html = string.Format("<table style=\"width:{0}\"><tr><td>{1}</td></tr></table>",
this.Width.ToString(),
writer.InnerWriter.ToString());
}
else
{
html = string.Format("<table style=\"width:{0}\"><tr><td align=\"center\" style=\"color:red;\"><b>{1}</b></td></tr></table>",
this.Width.ToString(),
this.ItemNotFoundMessage);
}
StringBuilder sb = new StringBuilder();
Manager.WriteValue(sb, html);
string script = string.Format("asbGetObj('{0}').ShowMenuDiv({1});", this.TextBoxID, sb.ToString());
Manager.AddScriptForClientSideEval(script);
}
private string GetField(AutoSuggestItem item, string field)
{
if (item.DataItem is DataRowView)
return ((DataRowView)item.DataItem)[field].ToString();
else if (item.DataItem is DataRow)
return ((DataRow)item.DataItem)[field].ToString();
else if (item.DataItem is ICollection)
{
Type type = item.DataItem.GetType();
MethodInfo m = type.GetMethod("get_Item");
return m.Invoke(item.DataItem, new object[] { field }).ToString();
}
else
{
//Here we use reflection to get the value of the any field of the defined
//in the DataItem property of AutoSuggestItem
Type type = item.DataItem.GetType();
FieldInfo fieldInfo = type.GetField(field);
if (fieldInfo != null)
return fieldInfo.GetValue(item.DataItem).ToString();
else
{
PropertyInfo prop = type.GetProperty(field);
if (prop != null)
return prop.GetValue(item.DataItem, null).ToString();
}
}
throw new Exception("The datasource type is not supported");
}
public AutoSuggestItemEventArgs(AutoSuggestItem item)
{
this._item = item;
}