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Checked dropdownlist

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Description

Voici une liste deroulante de cases à cocher

webcontrol dérivant de composite control

le code javascript, les images et les css sont inclus dans la dll

Source / Exemple :


namespace WebControlLibrary1
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Text;
    using System.Web.UI;
    using System.Web.UI.WebControls;

    [ToolboxData("<{0}:CheckedDropDownList runat=server></{0}:CheckedDropDownList>")]
    public class CheckedDropDownList : CompositeControl
    {
        #region private Members

        private string _ImageUrl;

        protected System.Web.UI.HtmlControls.HtmlGenericControl _divCustomCheckBoxList;

        protected System.Web.UI.HtmlControls.HtmlInputText _txtSelectedMLValues;

        protected System.Web.UI.HtmlControls.HtmlImage _imgShowHide;

        protected System.Web.UI.HtmlControls.HtmlGenericControl _divCheckBoxList;

        protected System.Web.UI.HtmlControls.HtmlTable _table;

        protected CheckBoxList _lstMultipleValues = new CheckBoxList();

        protected int _width = -1;

        protected int _timeoutBeforeHide = 200;

        private string _css;
        #endregion private Members

        #region Public mermbers
        [Category("Appearance")]
        [Description("css du control")]
        [Browsable(true)]
        public string CssClass
        {
            get
            {
                return _css;
            }
            set
            {
                _css = value;
            }
        }

        [Category("Appearance")]
        [Description("path de l'image represantant la fleche de la ddl")]
        [Browsable(true)]
        public string ImageUrl
        {
            get
            {
                return _ImageUrl;
            }
            set
            {
                _ImageUrl = value;
            }
        }

        /// <summary>
        /// Collection d'items de la CheckedDropDownList
        /// </summary>
        /// <returns></returns>
        public ListItemCollection Items
        {
            get
            {
                return _lstMultipleValues.Items;
            }
        }
        
        /// <summary>
        /// Largeur du control
        /// </summary>
        [Category("Appearance")]
        [Description("Largeur du control")]
        [Browsable(true)]
        public int Width
        {
            get
            {
                return _width;
            }
            set
            {
                _width = value;
            }
        }

        
        [Category("Appearance")]
        [Description("Timeout avant de cacher la liste lorsque la souris n'est plus dessus")]
        [Browsable(true)]
        public int TimeoutBeforeHide
        {
            get
            {
                return _timeoutBeforeHide;
            }
            set
            {
                _timeoutBeforeHide = value;
            }
        }

        #endregion Public mermbers

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            
            _divCustomCheckBoxList = new System.Web.UI.HtmlControls.HtmlGenericControl();
            _txtSelectedMLValues = new System.Web.UI.HtmlControls.HtmlInputText();
            _imgShowHide = new System.Web.UI.HtmlControls.HtmlImage();
            _divCheckBoxList = new System.Web.UI.HtmlControls.HtmlGenericControl();
            _table = new System.Web.UI.HtmlControls.HtmlTable();
            // setting name for textbox. using t just to concat with this.ID for uniqueName
            _divCustomCheckBoxList.ID = this.ID + "d";
            _txtSelectedMLValues.ID = this.ID + "t";
            _imgShowHide.ID = this.ID + "i";
            _divCheckBoxList.ID = this.ID + "dd";
            _lstMultipleValues.ID = this.ID + "chk";

            // For Image
            // setting alternative name for image
            _imgShowHide.Alt = "imageURL";
            if (!string.IsNullOrEmpty(_ImageUrl))
                _imgShowHide.Src = _ImageUrl;
            else
            {
                _imgShowHide.Src = Page.ClientScript.GetWebResourceUrl(this.GetType(), "WebControlLibrary1.Images.drop.gif");
            }

            _divCheckBoxList.Controls.Add(_lstMultipleValues);
            System.Web.UI.HtmlControls.HtmlTableRow row = new System.Web.UI.HtmlControls.HtmlTableRow();
            System.Web.UI.HtmlControls.HtmlTableRow row2 = new System.Web.UI.HtmlControls.HtmlTableRow();
            System.Web.UI.HtmlControls.HtmlTableCell cel1 = new System.Web.UI.HtmlControls.HtmlTableCell();
            System.Web.UI.HtmlControls.HtmlTableCell cel2 = new System.Web.UI.HtmlControls.HtmlTableCell();
            System.Web.UI.HtmlControls.HtmlTableCell cel3 = new System.Web.UI.HtmlControls.HtmlTableCell();
            cel1.Attributes.Add("class", "DropDownLook");
            cel1.Controls.Add(_txtSelectedMLValues);
            cel2.Attributes.Add("class", "DropDownLook");
            cel2.Controls.Add(_imgShowHide);
            cel3.ColSpan = 2;
            cel2.Attributes.Add("class", "DropDownLook");
            cel3.Controls.Add(_divCheckBoxList);
            row.Controls.Add(cel1);
            row.Controls.Add(cel2);
            row2.Controls.Add(cel3);
            _table.Controls.Add(row);
            _table.Controls.Add(row2);
            _lstMultipleValues.Attributes.Add("class", "CheckBoxList");
            _lstMultipleValues.Width = _width == -1 ? 250 : _width;
            _txtSelectedMLValues.Style.Add("width", _width == -1 ? "230px" : (_width - 25).ToString() + "px");
            _lstMultipleValues.EnableViewState = true;
            _lstMultipleValues.Attributes.Add("class", "DivCheckBoxList");
            _divCustomCheckBoxList.Controls.Add(_table);
        }

        /// <summary>
        /// Registers client script for generating postback events prior to rendering on the client, if <see cref="P:System.Web.UI.WebControls.TextBox.AutoPostBack"/> is true.
        /// </summary>
        /// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
        protected override void OnPreRender(EventArgs e)
        {
            string scriptName = "CheckedDropDownList";
            if (!Page.ClientScript.IsClientScriptBlockRegistered(scriptName))
            {
                string jsCheckedDropDownListFileName = "CheckedDropDownList.js";

                StringBuilder scriptBuilder = new StringBuilder();
                scriptBuilder.AppendFormat("var lstMultipleValuesId = '{0}_{1}';", this.ID, _lstMultipleValues.ID);
                Page.ClientScript.RegisterStartupScript(this.GetType(), "Columns", scriptBuilder.ToString(), true);

                 
                //double click on text box
                _divCustomCheckBoxList.Attributes.Add("onmouseover", "clearTimeout(timoutID);");//  
                _divCustomCheckBoxList.Attributes.Add("onmouseout", string.Format("timoutID = setTimeout('HideMList()', {0});", _timeoutBeforeHide));
                _txtSelectedMLValues.Attributes.Add("onclick", string.Format("ShowMList('{0}_{1}');", this.ID, _lstMultipleValues.ID));
                _imgShowHide.Attributes.Add("onclick", string.Format("ShowMList('{0}_{1}');", this.ID, _lstMultipleValues.ID));
                _lstMultipleValues.Attributes.Add("onclick", "FindSelectedItems(this," + _txtSelectedMLValues.ClientID + ");");
                //ajouter le javascript verifier qu'il est bien en mode incorpore dans les roprietes du fichier
                //et qu il soit present dans l'assembly info
                this.Page.ClientScript.RegisterClientScriptInclude(
                this.GetType(), "Tes1t",
                Page.ClientScript.GetWebResourceUrl(this.GetType(),
                string.Format("WebControlLibrary1.Javascripts.{0}", jsCheckedDropDownListFileName)));

                // create the style sheet control
                // and put it in the document header
                string csslink = "";

                if (string.IsNullOrEmpty(csslink))
                {
                    csslink = "<link href='" +
                       Page.ClientScript.GetWebResourceUrl(this.GetType(),
                        "WebControlLibrary1.Css.CheckedDropDownList.css")
                       + "' rel='stylesheet' type='text/css' />";
                }
                else
                {
                    csslink = "<link href='" + _css + "' rel='stylesheet' type='text/css' />";
                }
                LiteralControl include = new LiteralControl(csslink);
                this.Page.Header.Controls.Add(include);
            }

            base.OnPreRender(e);
        }

        /// <summary>
        /// adding child controls to composite control
        /// </summary>
        protected override void CreateChildControls()
        {

            this.Controls.Add(_divCustomCheckBoxList);
            base.CreateChildControls();

            //necessaire pour conserver les items au post back
            if (_lstMultipleValues.Items.Count > 0)
            {
                SerializableListItemCollection coll = new SerializableListItemCollection(_lstMultipleValues.Items);
                ViewState[this.ID + "Items"] = coll;
            }
            else
            {
                if (ViewState[this.ID + "Items"] != null)
                {
                    SerializableListItemCollection lst = (SerializableListItemCollection)ViewState[this.ID + "Items"];

                    foreach (string key in lst.Items.Keys)
                        _lstMultipleValues.Items.Add(new ListItem(key, lst.Items[key]));
                }
            }
        }

        /// <summary>
        /// Get the id of the control rendered on client side
        /// Very essential for Javascript Calendar scripts to locate the textbox
        /// </summary>
        /// <returns></returns>
        public string getClientID()
        {
            return base.ClientID;
        }

        /// <summary>
        /// Add datasource to checked list
        /// </summary>
        /// <param name="o"></param>
        public void SetMultiValue(object o)
        {
            _lstMultipleValues.DataSource = o;
            _lstMultipleValues.DataTextField = "Label";
            _lstMultipleValues.DataValueField = "Value";

            _lstMultipleValues.DataBind();
        }
    }

    [Serializable]
    public class SerializableListItemCollection
    {
        public Dictionary<string, string> Items;
        public SerializableListItemCollection(ListItemCollection coll)
        {
            Items = new Dictionary<string, string>();
            foreach (ListItem item in coll)
                Items.Add(item.Text, item.Value);
        }
    }
}

javascript :

var timoutID = 200;
function ShowMList(id) {
    var divRef = document.getElementById(id);
    if (divRef != null)
        divRef.style.display = "block";
}

function HideMList(id) {
    var divRef = document.getElementById(id);
    if(divRef != null)
        divRef.style.display = "none";
}

function HideMList() {
var ctrl = document.getElementById(lstMultipleValuesId)
if (ctrl != null)
        ctrl.style.display = "none";
    
}

function FindSelectedItems(sender, textBoxID) {
    var cblstTable = document.getElementById(sender.id);
    var checkBoxPrefix = sender.id + "_";
    var noOfOptions = cblstTable.rows.length;
    var selectedText = "";
    for (i = 0; i < noOfOptions; ++i) {
        if (document.getElementById(checkBoxPrefix + i).checked) {
            if (selectedText == "")
                selectedText = document.getElementById(checkBoxPrefix + i).parentNode.innerText;
            else
                selectedText = selectedText + "," + document.getElementById(checkBoxPrefix + i).parentNode.innerText;
        }
    }
    document.getElementById(textBoxID.id).value = selectedText;
}

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