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Using JavaScript To Select GridView Rows

, 22 May 2007 CPOL
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Using JavaScript To Select GridView Rows

Contents

Introduction

If you have ever used the ASP.NET GridView control (I have only just started learning ASP.NET, so please forgive me, if I get some of the names of things slightly wrong), you will know that the user is able to select rows within the grid. While this is a great feature of the GridView control, you would normally have to select a row using a CommandField or a hyperlink column with a CommandName="Select" property included. This, I think just looks a bit naff.

Surely, there is a better way. Well luckily there is, we can simply use client side JavaScript to do the row selection. That is what this article is all about. The code is minimal, and very easy to understand, but I think it is useful code, and I also think it is something that anyone that works with the GridView control should know.

Sample Table Used

I am actually using Microsoft SQL Server 2005, with the attached DEMO app. You will need to change the Web.Config file to point to your own SQL Server installation. For the GridView data I have chosen to use the master database, dbo.spt_values table, that comes with SQL Server 2005

The master table structure, and the query that the demo app uses are as follows:

How It Works

It's very easy actually, all we do is use a <asp:SqlDataSource/> web control to bind to the master database (remember you'll need to change the connection section in the web.config to point at your own database). The GridView data is obtained using a simple select statement SELECT TOP 5 * FROM dbo.spt_values table, and then have the GridView control use this <asp:SqlDataSource/>. Then we include a <asp:CommandField ShowSelectButton="True" Visible="False" /> field which we set to be invisible.

One more point to note is that the Page must have the following directive set in order to allow the JavaScript postback mechanism that is described below.

So in the page declarations section, ensure the following is set EnableEventValidation="false"

So that's the ASPX file (web form), but we also need to write some code in the code behind and use a little bit of JavaScript. So the code behind (C# for the attached demo) looks like :

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class grid : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    /// <span class="code-SummaryComment"><summary></span>
    /// Check the item being bound is actually a DataRow, if it is,     
    /// wire up the required html events and attach the relevant JavaScripts
    /// <span class="code-SummaryComment"></summary></span>
    /// <span class="code-SummaryComment"><param name="sender">GridView1</param></span>
    /// <span class="code-SummaryComment"><param name="e">The event args for the RowDataBound event</param></span>
    protected void GridView1_RowDataBound(object sender, 
                    GridViewRowEventArgs e)
    {
        //check the item being bound is actually a DataRow, if it is, 
        //wire up the required html events and attach the relevant JavaScripts
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Attributes["onmouseover"] = 
                "javascript:setMouseOverColor(this);";
            e.Row.Attributes["onmouseout"] = 
                "javascript:setMouseOutColor(this);";
            e.Row.Attributes["onclick"] = 
            ClientScript.GetPostBackClientHyperlink
                (this.GridView1, "Select$" + e.Row.RowIndex);
        }
    }

    /// <span class="code-SummaryComment"><summary></span>
    /// Show the 1st cell value in the web pages TextBox to show the user
    /// it is actually selecting rows at client side
    /// <span class="code-SummaryComment"></summary></span>
    /// <span class="code-SummaryComment"><param name="sender"> GridView1</param></span>
    /// <span class="code-SummaryComment"><param name="e">The event args for the SelectedIndexChanged event</span>
    ///    <span class="code-SummaryComment"></param></span>
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        TextBox1.Text = GridView1.SelectedRow.Cells[1].Text;
    }
}

This works by attaching 2 JavaScripts to the current GridView row.

  • One for onmouseover which simply sets the current row to be highlighted a certain color. I chose Yellow, but you can change that.
  • One for onmouseout which simply resets the current row to be the original color

There is also a clever line as given below:

e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink
                (this.GridView1, "Select$" + e.Row.RowIndex);

This cunningly creates a client hyperlink which posts back the current ASPX web form, using the Select$0 to select row 0 say.

The ASPX pages JavaScript is as follows:

<script language="javascript" type="text/javascript">
var oldgridSelectedColor;

function setMouseOverColor(element)
{
    oldgridSelectedColor = element.style.backgroundColor;
    element.style.backgroundColor='yellow';
    element.style.cursor='hand';
    element.style.textDecoration='underline';
}

function setMouseOutColor(element)
{
    element.style.backgroundColor=oldgridSelectedColor;
    element.style.textDecoration='none';
}
</script>

And that's it. So what we get is now a nice GridView control, that we select rows with using JavaScript, and it looks like a table, rather than a table plus some nasty SELECT button, or a hyperlink column (that is only being used as a row selection method anyway).

That's it

And that as they say is that. Simple wasn't it. Probably my most simple article yet. But I think it's a useful one, I have always wondered how my online bank did produced such a nice grid.

So What Do You Think ?

I would just like to ask, if you liked the article please vote for it, and leave some comments, as it lets me know if the article was at the right level or not, and whether it contained what people need to know.

Conclusion

Well that's it actually. Although the code is very simple, I'm sure you'll agree this JavaScript selection method sure looks better than having a button column, or a hyperlink column to do the row selection. And it's more intuitive, I think. The users simply point and click the row they want, job done.

History

  • v1.0 - 22/05/07

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sacha Barber
Software Developer (Senior)
United Kingdom United Kingdom
I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)
 
- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence
 
Both of these at Sussex University UK.
 
Award(s)

I am lucky enough to have won a few awards for Zany Crazy code articles over the years

  • Microsoft C# MVP 2014
  • Codeproject MVP 2014
  • Microsoft C# MVP 2013
  • Codeproject MVP 2013
  • Microsoft C# MVP 2012
  • Codeproject MVP 2012
  • Microsoft C# MVP 2011
  • Codeproject MVP 2011
  • Microsoft C# MVP 2010
  • Codeproject MVP 2010
  • Microsoft C# MVP 2009
  • Codeproject MVP 2009
  • Microsoft C# MVP 2008
  • Codeproject MVP 2008
  • And numerous codeproject awards which you can see over at my blog

Comments and Discussions

 
GeneralNot happy with select Pinmemberesb779-Nov-14 14:26 
GeneralMy vote of 5 Pinmember Orcun Iyigun13-May-13 11:12 
QuestionMy Vote is 5 Pinmemberanglo007218-Nov-12 23:46 
AnswerRe: My Vote is 5 PinmemberHerbisaurus15-Aug-13 3:45 
GeneralMy vote of 2 Pinmemberenkhtuvshin_b12-Sep-12 20:45 
Questionusing Up down arrow keys to select the Gridview asp.net 3.5 PinmemberKhanFaiz21-Jun-12 19:25 
GeneralMy vote of 5 Pinmembernebulaqueen5-Apr-12 6:22 
Questionrow highlighted PinmemberMike_0411-Feb-12 22:35 
Question__doPostBack Pinmemberpdusp1-Feb-12 0:09 
GeneralMy vote of 5 PinmemberErnesto Tejeda15-Oct-11 17:05 
GeneralMy vote of 5 Pinmemberanurag129011-Oct-11 2:14 
QuestionLess risky code Pinmembernebojsa1623-Sep-11 8:45 
GeneralMy vote of 2 PinmemberRamesh_495925-Jun-11 23:42 
Questiongood but with sequrity Risk PinmemberRamesh_495925-Jun-11 23:41 
AnswerRe: good but with sequrity Risk Pinmembernebojsa1623-Sep-11 8:40 
Instead that use code bellow.
 
<style type="text/css">
 .hideColumn {display:none;}
</style>
 
<asp:GridView ID="GridView1" .....
 <asp:CommandField ShowSelectButton="True" Visible="True" SelectText="Select" ItemStyle-CssClass="hideColumn" HeaderStyle-CssClass="hideColumn" />
 ...
</asp:GridView>
 

in (vb) code :
Private Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.DataRow Then
          e.Row.Attributes("onclick") = ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" + e.Row.RowIndex.ToString)
        End If
End Sub
 
no security risk, EnableEventValidation stayed enabled (true).
p.s. sorry for my weak english.
QuestionError Message Pinmemberneilderama21-Jun-11 16:41 
AnswerRe: Error Message PinmemberHerbisaurus15-Aug-13 3:46 
GeneralMy vote of 5 Pinmemberahsan sarfraz6-Dec-10 19:56 
GeneralMy vote of 5 PinmemberjasonHall30-Nov-10 18:07 
QuestionGreat! Pinmemberbertvaes22-Nov-10 3:28 
Generalgreat article PinmemberkamalRafi8-Oct-10 22:58 
GeneralMy vote of 5 PinmemberJason Sheridan15-Sep-10 4:52 
GeneralNice Pinmemberdigsourse16-Dec-09 22:28 
GeneralThanks PinmemberNitin Sawant4-Aug-09 1:58 
GeneralEnableEventValidation="false" Pinmemberworko26-Apr-09 3:45 
GeneralVery Nice Pinmemberaabruzzese12-Jan-09 5:25 
GeneralRe: Very Nice PinmvpSacha Barber12-Jan-09 7:24 
GeneralGood work & Suggestion PinmemberMoon Chung9-Jan-09 8:02 
GeneralMy vote of 1 PinmemberGUI Developer21-Dec-08 7:48 
GeneralRe: My vote of 1 PinmvpSacha Barber12-Jan-09 7:25 
GeneralGridViw Pinmembered.suriv4-Dec-08 10:36 
GeneralRe: GridViw PinmvpSacha Barber4-Dec-08 22:48 
GeneralGreat article Pinmemberdamu198320-Sep-08 1:06 
GeneralRe: Great article PinmvpSacha Barber20-Sep-08 3:16 
GeneralAmazing Pinmembersimer_project2-Sep-08 22:25 
GeneralRe: Amazing PinmvpSacha Barber18-Sep-08 2:13 
Generalone word : THANKS ! PinmemberBrad Woody22-Aug-08 4:21 
GeneralRe: one word : THANKS ! PinmvpSacha Barber22-Aug-08 5:12 
GeneralNice article .. very much useful also .. PinmemberRahees8321-Jul-08 23:19 
GeneralRe: Nice article .. very much useful also .. PinmvpSacha Barber22-Jul-08 2:39 
Generalhai Pinmemberjeffreyk9-Apr-08 0:22 
GeneralRe: hai PinmvpSacha Barber9-Apr-08 2:00 
GeneralRe: hai Pinmemberjolvera18-Jun-09 6:33 
Generalhai Pinmemberjeffreyk8-Apr-08 23:41 
GeneralThanx Pinmembermarx_city8-Apr-08 7:27 
GeneralRe: Thanx PinmvpSacha Barber8-Apr-08 22:37 
GeneralNice !! PinmemberC. L. Phillip12-Mar-08 9:32 
GeneralRe: Nice !! PinmvpSacha Barber12-Mar-08 11:40 
QuestionCell Value ? Pinmembermurtaza dhari6-Mar-08 2:54 
AnswerRe: Cell Value ? PinmvpSacha Barber6-Mar-08 4:08 

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