Web Paging Navigation Control

Nesreen Maged
12y
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0
0

Article

Introduction

this web paging control for navigation in data list .

how to use this control

1-Set Control setting in page load

2-to get page index from this control use PagingControl1_PageIndexClick(object sender, EventArgs e) event

Sample for how to use this control

 

#region 
Events

        protected void 
Page_Load(object sender, EventArgs 
e)
        
{
            if (!IsPostBack)            {                //set control 
settings
                
PagingControl1.NoRecordsPerPage = 20;              
PagingControl1.CurrentPageIndex = 1;
                
PagingControl1.NavigationLinkesCount = 12;

                
//Get Items data 

                
ViewState["_Items"] = 
GetItems();
                
ViewPage(PagingControl1.CurrentPageIndex);
            
}
        
}

        protected void 
PagingControl1_PageIndexClick(object sender, 
EventArgs e)
        
{
            
ViewPage(PagingControl1.CurrentPageIndex);
        
}






 private void ViewPage(int 
PageNo)
        
{
            if (ViewState["_Items"] != 
null)
            
{
                
PagedDataSource objPds = new 
PagedDataSource();
                
DataTable dt = (DataTable)ViewState["_Items"];
                
objPds.DataSource = new 
DataView(dt);
                
objPds.AllowPaging = true;
                
objPds.PageSize = 
PagingControl1.NoRecordsPerPage;
                
objPds.CurrentPageIndex = PageNo-1;

                
dlstItems.DataSource = 
objPds;
                
dlstItems.DataBind();

                
double d = 
Math.Ceiling(Convert.ToDouble(dt.Rows.Count) / 
PagingControl1.NoRecordsPerPage);
                
PagingControl1.PagesCount = 
Convert.ToInt32(d);


                
dlstItems.Visible = true;
                
PagingControl1.Visible = true;
                
lblResultMessage.Visible = false;

            
}
            else
            
{
                
dlstItems.Visible = false;
                
lblResultMessage.Visible = true;
                
PagingControl1.Visible = false;
                
lblResultMessage.Text = "No 
Result";

            
}

        
}

        private DataTable 
GetItems()
        
{
            
DataTable dt = new 
DataTable();
            
dt.Columns.Add("ItemId");
            
dt.Columns.Add("ItemName");

            
for (int i = 
1; i <= 400; 
i++)
            
{
                
DataRow dr = 
dt.NewRow();
                
dr["ItemId"] = 
i.ToString();
                
dr["ItemName"] = 
"Item" + 
i;
                
dt.Rows.Add(dr);

            
}
            return 
dt;
        
}

        #endregion

The Control Properties and events (Source Code):

[DefaultProperty("Text")] [ToolboxData("<{0}:PagingControl runat="server">")] public class PagingControl : WebControl { #region Variables Label lblCount = new Label(); #endregion #region Properties #region Appearance public enum Alignment { Center, Right, Left, } public enum Position { Top, Bottom, Right, Left, } [Bindable(true)] [Category("Appearance")] [DefaultValue("")] [Localizable(true)] public string Text { get { String s = Convert.ToString(ViewState["Text"]); if (s == null || s.Length==0) { return String.Empty; } else { return s; } } set { ViewState["Text"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("||"), Localizable(true)] public string LinkSeparatorText { get { string s = Convert.ToString(ViewState["_LinkSeparatorText"]); if (s == null || s.Length==0) { return "||"; } else { return s; } } set { ViewState["_LinkSeparatorText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("Prev"), Localizable(true)] public String PreviousButtonText { get { String s = Convert.ToString(ViewState["_PreviousButtonText"]); if (s == null || s.Length==0) { return "Prev"; } else { return s; } } set { ViewState["_PreviousButtonText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("Next"), Localizable(true)] public String NextButtonText { get { String s = Convert.ToString(ViewState["_NextButtonText"]); if (s == null || s.Length==0) { return "Next"; } else { return s; } } set { ViewState["_NextButtonText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("First"), Localizable(true)] public String FirstButtonText { get { String s = Convert.ToString(ViewState["_FirstButtonText"]); if (s == null || s.Length==0) { return "First"; } else { return s; } } set { ViewState["_FirstButtonText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("Last"), Localizable(true)] public String LastButtonText { get { String s = Convert.ToString(ViewState["_LastButtonText"]); if (s == null || s.Length==0) { return "Last"; } else { return s; } } set { ViewState["_LastButtonText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue(" Of "), Localizable(true)] public String SeparatedCountText { get { String s = Convert.ToString(ViewState["_SeparatedCountText"]); if (s == null || s.Length==0) { return " Of "; } else { return s; } } set { ViewState["_SeparatedCountText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("("), Localizable(true)] public String BeforeCountText { get { String s = Convert.ToString(ViewState["_BeforeCountText"]); if (s == null || s.Length==0) { return "("; } else { return s; } } set { ViewState["_BeforeCountText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue(")"), Localizable(true)] public String AfterCountText { get { String s = Convert.ToString(ViewState["_AfterCountText"]); if (s == null || s.Length==0) { return ")"; } else { return s; } } set { ViewState["_AfterCountText"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("Alignment.Center"), Localizable(true)] public Alignment CountAlignment { get { Alignment s = Alignment.Center; if(ViewState["_CountAlignment"]!=null) s = (Alignment)ViewState["_CountAlignment"]; return s; } set { ViewState["_CountAlignment"] = value; } } [Bindable(true), Category("Appearance"), DefaultValue("Position.Bottom"), Localizable(true)] public Position CountPosition { get { Position s = Position.Bottom; if (ViewState["_CountPosition"] != null) s = (Position)ViewState["_CountPosition"]; return s; } set { ViewState["_CountPosition"] = value; } } #endregion #region Visibility [Bindable(true), Category("Visibility"), DefaultValue("true"), Localizable(true)] public Boolean ShowCount { get { Boolean s = false; if (ViewState["_ShowCount"] == null) { s = true; } return s; } set { ViewState["_ShowCount"] = value; } } [Bindable(true), Category("Visibility"), DefaultValue("true"), Localizable(true)] public Boolean ShowFirst { get { Boolean s = false; if (ViewState["_ShowFirst"] == null) { s = true; } return s; } set { ViewState["_ShowFirst"] = value; } } [Bindable(true), Category("Visibility"), DefaultValue("true"), Localizable(true)] public Boolean ShowLast { get { Boolean s = false; if (ViewState["_ShowLast"] == null) { s = true; } return s; } set { ViewState["_ShowLast"] = value; } } [Bindable(true), Category("Visibility"), DefaultValue("true"), Localizable(true)] public Boolean ShowPrevious { get { Boolean s = false; if (ViewState["_ShowPrevious"] == null) { s = true; } return s; } set { ViewState["_ShowPrevious"] = value; } } [Bindable(true), Category("Visibility"), DefaultValue("true"), Localizable(true)] public Boolean ShowNext { get { Boolean s = false; if (ViewState["_ShowNext"] == null) { s = true; } return s; } set { ViewState["_ShowNext"] = value; } } #endregion #region Paging private Int32 _CurrentStartPage; public Int32 CurrentStartPage { get { if ((CurrentPageIndex % NavigationLinkesCount == 0)) { _CurrentStartPage = (CurrentPageIndex - NavigationLinkesCount) + 1; } else { _CurrentStartPage = (CurrentPageIndex - (CurrentPageIndex % NavigationLinkesCount)) + 1; } return _CurrentStartPage; } } private Int32 _CurrentPageIndex; public Int32 CurrentPageIndex { get { if ((ViewState["_CurrentPageIndex"] == null)) { _CurrentPageIndex = 1; } else { _CurrentPageIndex = Convert.ToInt32(ViewState["_CurrentPageIndex"]); } return _CurrentPageIndex; } set { _CurrentPageIndex = value; ViewState["_CurrentPageIndex"] = _CurrentPageIndex; } } /// /// number of pages /// private Int32 _PagesCount; public Int32 PagesCount { get { if (ViewState["_PagesCount"] == null) { _PagesCount = 1; } else { _PagesCount = Convert.ToInt32(ViewState["_PagesCount"]); } return _PagesCount; } set { _PagesCount = value; ViewState["_PagesCount"] = _PagesCount; } } /// /// count of navigation linkes that will appears /// private Int32 _NavigationLinkesCount; public Int32 NavigationLinkesCount { get { if (ViewState["_NavigationLinkesCount"] == null) { _NavigationLinkesCount = 1; } else { _NavigationLinkesCount = Convert.ToInt32(ViewState["_NavigationLinkesCount"]); } return _NavigationLinkesCount; } set { _NavigationLinkesCount = value; ViewState["_NavigationLinkesCount"] = _NavigationLinkesCount; } } /// /// Number of records that will appears per page /// private Int32 _NoRecordsPerPage; public Int32 NoRecordsPerPage { get { if (ViewState["_NoRecordsPerPage"] == null) { _NoRecordsPerPage = 1; } else { _NoRecordsPerPage = Convert.ToInt32(ViewState["_NoRecordsPerPage"]); } return _NoRecordsPerPage; } set { _NoRecordsPerPage = value; ViewState["_NoRecordsPerPage"] = _NoRecordsPerPage; } } #endregion #endregion #region Methods private void SelectPage() { Int32 PageIndex = CurrentPageIndex; Control ctl = FindControl(this.ClientID + "_" + "btn" + PageIndex); if (ctl != null) { LinkButton btnToBeClicked = (LinkButton)ctl; if (btnToBeClicked != null) { btnToBeClicked.Enabled = false; lblCount.Text = BeforeCountText + PageIndex + SeparatedCountText + PagesCount + AfterCountText; } } } public void PaintWithoutClickSelected() { GeneratePaging(); SelectPage(); } public void PaintWithClickSelected() { PaintWithoutClickSelected(); FirePageClickEvent(); } #endregion #region Event /// /// page index click event fire when click on navegations buttons /// public event EventHandler PageIndexClick; protected override void OnLoad(System.EventArgs e) { //Generate Linked Buttons PaintWithoutClickSelected(); base.OnLoad(e); } protected override void CreateChildControls() { base.CreateChildControls(); } protected override void OnPreRender(EventArgs e) { //Generate Linked Buttons PaintWithoutClickSelected(); base.OnPreRender(e); } protected override void Render(System.Web.UI.HtmlTextWriter writer) { foreach (Control ctl in this.Controls) { if (ctl != null) { ctl.RenderControl(writer); } } base.Render(writer); } protected override void RenderContents(HtmlTextWriter output) { output.Write(Text); } protected void LinkedButtonClick(Object sender, EventArgs e) { LinkButton lbtn = (LinkButton)sender; if ((lbtn.ID.IndexOf(this.ClientID + "_" + "btnFirst") > -1)) { CurrentPageIndex = 1; } else if ((lbtn.ID.IndexOf(this.ClientID + "_" + "btnPrevPage") > -1)) { if ((CurrentPageIndex > 1)) { CurrentPageIndex = CurrentPageIndex - 1; } } else if ((lbtn.ID.IndexOf(this.ClientID + "_" + "btnNextPage") > -1)) { if ((CurrentPageIndex < PagesCount)) { CurrentPageIndex = CurrentPageIndex + 1; } } else if ((lbtn.ID.IndexOf(this.ClientID + "_" + "btnLast") > -1)) { CurrentPageIndex = PagesCount; } else { CurrentPageIndex = Convert.ToInt32(lbtn.Text); } PaintWithClickSelected(); } private void FirePageClickEvent() { if (PageIndexClick != null) { PageIndexClick(null, null); } } #endregion private void GeneratePaging() { this.Controls.Clear(); #region Count Label Top Left // add count label according to it's position lblCount = new Label(); lblCount.ID = this.ClientID + "_" + "lblCount"; lblCount.Visible = ShowCount; if (CountPosition == Position.Top) { // Controls.Add(new LiteralControl(" ")) Controls.Add(new LiteralControl(" ")); this.Controls.Add(lblCount); //Controls.Add(new LiteralControl(" ")) Controls.Add(new LiteralControl("")); // Controls.Add(new LiteralControl(" ")) } else if (CountPosition == Position.Left) { this.Controls.Add(lblCount); } #endregion ////Start Links //// Int32 EndPage = CurrentStartPage + NavigationLinkesCount - 1; if ((EndPage > PagesCount)) { EndPage = PagesCount; } LinkButton lbtn; for (int i = CurrentStartPage; i <= EndPage; i++) { #region First Button And Prev //First Button And Prev if (CurrentPageIndex > 1 && (i == CurrentStartPage)) { // added once in start //First lbtn = new LinkButton(); lbtn.Text = FirstButtonText; lbtn.ID = this.ClientID + "_" + "btnFirst"; lbtn.CausesValidation = false; lbtn.Visible = ShowFirst; lbtn.Click += LinkedButtonClick; Controls.Add(lbtn); if (ShowFirst) { Controls.Add(new LiteralControl(LinkSeparatorText)); //Previous lbtn = new LinkButton(); lbtn.Text = PreviousButtonText; lbtn.ID = this.ClientID + "_" + "btnPrevPage" + (CurrentPageIndex - 1); lbtn.CausesValidation = false; lbtn.Visible = ShowPrevious; lbtn.Click += LinkedButtonClick; Controls.Add(lbtn); Controls.Add(new LiteralControl(LinkSeparatorText)); // if( ShowPrevious ){ Controls.Add(new LiteralControl(LinkSeparatorText)) } } #endregion #region Pages No //Page Index lbtn = new LinkButton(); lbtn.Text = i.ToString(); lbtn.ID = this.ClientID + "_" + "btn" + i.ToString(); lbtn.CausesValidation = false; lbtn.Click += LinkedButtonClick; Controls.Add(lbtn); if (PagesCount > 1) { Controls.Add(new LiteralControl(LinkSeparatorText)); } lbtn.Enabled = true; #endregion #region Next Button And Last //Next Button And Last //added once if( CurrentPageIndex less than if (CurrentPageIndex < PagesCount && (i == EndPage)) { //add once in End //Next lbtn = new LinkButton(); lbtn.Text = NextButtonText; lbtn.ID = this.ClientID + "_" + "btnNextPage" + (CurrentPageIndex + 1); lbtn.CausesValidation = false; lbtn.Visible = ShowNext; lbtn.Click += LinkedButtonClick; Controls.Add(lbtn); if (ShowNext) { Controls.Add(new LiteralControl(LinkSeparatorText)); //Last lbtn = new LinkButton(); lbtn.Text = LastButtonText; lbtn.ID = this.ClientID + "_" + "btnLast" + (i + 1); lbtn.CausesValidation = false; lbtn.Visible = ShowLast; lbtn.Click += LinkedButtonClick; Controls.Add(lbtn); //if( ShowLast ){ Controls.Add(new LiteralControl(LinkSeparatorText)) } } #endregion } //End Links #region Count Label Bottom Right //add count label according to it's position if (CountPosition == Position.Bottom) { Controls.Add(new LiteralControl(" ")); //Controls.Add(new LiteralControl(" ")) Controls.Add(new LiteralControl(" ")); this.Controls.Add(lblCount); Controls.Add(new LiteralControl(" ")); //Controls.Add(new LiteralControl(" ")) } else if (CountPosition == Position.Right) { this.Controls.Add(lblCount); } #endregion } }

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