J'essaie de créer un contrôle personnalisé qui étend le RadComboBox de Telerik pour créer une liste déroulante Checkbox avec des modèles par défaut. Le plan est d'utiliser le contrôle dans plusieurs endroits, donc je voulais consolider toute la logique en un seul endroit.Contrôle du serveur ASP.NET basé sur RadComboBox - Problème de publication
Cependant, je rencontre un couple de problèmes étranges sur la publication. Si vous cochez quelques éléments, puis cliquez sur le bouton Appliquer, les éléments corrects sont sélectionnés, mais le texte de la case à cocher est différent. Puis, lors de la publication suivante, j'obtiens l'erreur Multiple controls with the same ID 'i2' were found. FindControl requires that controls have unique IDs.
Le contrôle personnalisé est joint. Toute aide est appréciée.
C# Code:
/// <summary>
/// Private Header template class for the DropdownCheckboxList
/// </summary>
class CheckboxListFooterTemplate : ITemplate
{
#region Public Methods
public void InstantiateIn(Control container)
{
string footer = "<input type=\"submit\" value=\"Apply\" />";
container.Controls.Add(new LiteralControl(footer));
}
#endregion Public Methods
}
/// <summary>
/// Private Header template class for the DropdownCheckboxList
/// </summary>
class CheckboxListHeaderTemplate : ITemplate
{
#region Public Methods
public void InstantiateIn(Control container)
{
string header = "<input type=\"button\" value=\"Check All\" onclick=\"CheckAll("{0}", true)\" />";
header += " <input type=\"button\" value=\"Uncheck All\" onclick=\"CheckAll("{0}", false)\" />";
container.Controls.Add(new LiteralControl(string.Format(header, container.Parent.ClientID)));
}
#endregion Public Methods
}
/// <summary>
/// Template class for the DropdownChecklistBox
/// </summary>
class CheckboxListTemplate : ITemplate
{
#region Constants
//this div will stop the list from closing as a listitem is clicked
const string head = "<div onclick=\"StopPropagation(event)\" class=\"combo-item-template\">";
const string tail = "</div>";
#endregion Constants
#region Private Methods
/// <summary>
/// Bind the data to the checkbox
/// </summary>
/// <param name="sender">Checkbox to bind data to</param>
/// <param name="e"></param>
private void checkbox_DataBinding(object sender, EventArgs e)
{
CheckBox target = (CheckBox)sender;
RadComboBoxItem item = (RadComboBoxItem)target.BindingContainer;
string itemText = (string)DataBinder.Eval(item, "Text");
target.Text = itemText;
}
#endregion Private Methods
#region Public Methods
/// <summary>
/// Create the checkbox list items in the template
/// </summary>
/// <param name="container">Container that the control will be added</param>
public void InstantiateIn(Control container)
{
CheckBox checkbox = new CheckBox();
checkbox.ID = "chkList";
checkbox.Attributes.Add("onclick", string.Format("onCheckBoxClick(this, \"{0}\")", container.Parent.ClientID));
container.Controls.Add(new LiteralControl(head));
checkbox.DataBinding += new EventHandler(checkbox_DataBinding);
container.Controls.Add(checkbox);
container.Controls.Add(new LiteralControl(tail));
}
#endregion Public Methods
}
//todo: complete summary
/// <summary>
/// based on telerik demo: http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/templates/defaultcs.aspx
/// </summary>
[DefaultProperty("Text")]
[ToolboxData("<{0}:DropdownCheckboxList runat=server></{0}:DropdownCheckboxList>")]
public class DropdownCheckboxList : RadComboBox, INamingContainer
{
#region Private Properties
string SelectedText
{
get
{
StringBuilder values = new StringBuilder(SelectedItems.Count);
foreach (RadComboBoxItem item in SelectedItems)
values.Append(item.Text + ", ");
if (values.Length > 0)
return values.ToString().Remove(values.Length - 2, 2);
else
return EmptyMessage;
}
}
#endregion Private Properties
#region Public Properties
public RadComboBoxItemCollection SelectedItems
{
get
{
CheckBox chk = null;
RadComboBoxItemCollection selectedItems = new RadComboBoxItemCollection(this);
foreach (RadComboBoxItem item in Items)
{
chk = (CheckBox)item.FindControl("chkList");
if (chk != null && chk.Checked)
selectedItems.Add(item);
}
return selectedItems;
}
}
//todo: summary
public override string SelectedValue
{
get
{
StringBuilder values = new StringBuilder(SelectedItems.Count);
foreach (RadComboBoxItem item in SelectedItems)
values.Append(item.Value + ", ");
if (values.Length > 0)
return values.ToString().Remove(values.Length - 2, 2);
else
return "";
}
set
{
if (value != null)
SelectedValues = new List<string>(value.Split(','));
}
}
//todo: summary
public List<string> SelectedValues
{
get
{
List<string> selectedValues = new List<string>();
foreach (RadComboBoxItem item in SelectedItems)
{
selectedValues.Add(item.Value);
}
return selectedValues;
}
set
{
RadComboBoxItem item = null;
CheckBox chk = null;
foreach (string val in value)
{
item = Items.FindItemByValue(val.Trim());
if (item != null)
{
chk = (CheckBox)item.FindControl("chkList");
if (chk != null)
chk.Checked = true;
}
}
}
}
#endregion Public Properties
#region Protected Methods
protected override void CreateChildControls()
{
if (base.HeaderTemplate == null)
base.HeaderTemplate = new CheckboxListHeaderTemplate();
if (base.ItemTemplate == null)
base.ItemTemplate = new CheckboxListTemplate();
if (base.FooterTemplate == null)
base.FooterTemplate = new CheckboxListFooterTemplate();
base.CreateChildControls();
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
string resourceName = "CustomControls.DropdownCheckboxList.js";
ClientScriptManager cs = this.Page.ClientScript;
cs.RegisterClientScriptResource(typeof(CustomControls.DropdownCheckboxList), resourceName);
Text = SelectedText;
}
#endregion Protected Methods
}
code Javascript:
//based on telerik demo: http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/templates/defaultcs.aspx
var cancelDropDownClosing = false;
function StopPropagation(e) {
//cancel bubbling
e.cancelBubble = true;
if (e.stopPropagation) {
e.stopPropagation();
}
}
function onDropDownClosing() {
cancelDropDownClosing = false;
}
function CheckAll(comboBoxId, value) {
var combo = $find(comboBoxId);
//get the collection of all items
var items = combo.get_items();
//enumerate all items
for (var i = 0; i < items.get_count(); i++) {
var item = items.getItem(i);
//get the checkbox element of the current item
var chk1 = $get(combo.get_id() + "_i" + i + "_chkList");
chk1.checked = value;
}
}
function onCheckBoxClick(chk, comboBoxId) {
var combo = $find(comboBoxId);
//holds the text of all checked items
var text = "";
//holds the values of all checked items
var values = "";
//get the collection of all items
var items = combo.get_items();
//enumerate all items
for (var i = 0; i < items.get_count(); i++) {
var item = items.getItem(i);
//get the checkbox element of the current item
var chk1 = $get(combo.get_id() + "_i" + i + "_chkList");
if (chk1.checked) {
text += item.get_text() + ", ";
values += item.get_value() + ", ";
}
}
//remove the last comma from the string
text = removeLastComma(text);
values = removeLastComma(values);
if (text.length > 0) {
//set the text of the combobox
combo.set_text(text);
}
else {
//all checkboxes are unchecked
//so reset the controls
combo.set_text("");
}
}
//this method removes the ending comma from a string
function removeLastComma(str) {
return str.replace(/,$/, "");
}