How to show limited characters in asp.net gridview column display on javasctipt alert by using asp.net javascript

In asp.net gridview, here we have to hide all extra characters and display only limited number of characters by clicking on gridview column with the help of java script function placed on anchor tag in asp.net gridview column of ItemTemplate.

Source Code : 

<asp:GridView ID="gvRpts" runat="server" AutoGenerateColumns="False

Width="100%" >

<Columns>

 <asp:BoundField DataField="Date" HeaderText="Date" ></asp:BoundField>

<asp:TemplateField HeaderText="Particulars">

<EditItemTemplate>

<asp:TextBox ID="TextBox2" runat="server"

Text='<%# Bind("Particulars") %>'></asp:TextBox>                                    </EditItemTemplate>

<ItemTemplate>

<a id="anchrID" onclick="javascript:showExtraChars('<%# Eval("Particulars") %>')" >

<asp:Label ID="Label2" runat="server"

Text='<%#Eval("Particulars").ToString().Length <= 25 ? Eval("Particulars") : (Eval("Particulars") as string).Substring(0,26)+"..."  %>'>

</asp:Label></a>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

 Javascript Code :

<script language="javascript" type="text/javascript">

function showExtraChars (reason) {

        if (reason == null || reason == "")

            alert('Empty data… ');

        else

            alert(reason);

    }

</script>

Result : 

get weekly data (Lastweek, Thisweek and Nextweek) in sql server

declare @TodaysDate datetime;

set @TodaysDate = getdate();

select convert(varchar(20), dateadd(wk, datediff(wk, 0, @TodaysDate) -1, 0), 107) LastWeekStart

select convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), -1), 107) LastWeekEnd

select convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), 0), 107) ThisWeekStart

select convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) +1, -1),107) ThisWeekEnd

select convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) + 1, 0),107) NextWeekStart

select convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) +2 , -1),107) NextWeekEnd


OR || Required date format - Monthname dd, yyyy

declare @TodaysDate datetime;

set @TodaysDate = getdate();

-- with this (December 31, 2017) date format

select datename(mm, convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate)-1, 0), 107))

+' '+ replace(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate)-1, 0), 107),

left(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate)-1, 0), 107),4),'') LastWeekStart

select datename(mm, convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), -1), 107))

+' '+ replace(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), -1), 107) ,

left(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), -1), 107) ,4),'')  LastWeekEnd

select datename(mm,convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), 0), 107))

+' '+ replace(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), 0), 107),

left(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate), 0), 107), 4), '') ThisWeekStart

select datename(mm,convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) +1, -1),107))

+' '+ replace(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) +1, -1),107),

left(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) +1, -1),107),4),'') ThisWeekEnd

select datename(mm,convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) + 1, 0),107))

+' '+ replace(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) + 1, 0),107),

left(convert(varchar(15), dateadd(wk, datediff(wk, 0, @TodaysDate) + 1, 0),107),4),'') NextWeekStart

select datename(mm,convert(varchar(15), dateadd(wk,datediff(wk, 0, @TodaysDate) +2 , -1),107))

+' '+ replace(convert(varchar(15), dateadd(wk,datediff(wk, 0, @TodaysDate) +2 , -1),107),

left(convert(varchar(15), dateadd(wk,datediff(wk, 0, @TodaysDate) +2 , -1),107),4),'') NextWeekEnd

Result :