Question

I want my GridView Rows to fire the SelectedIndexChanged event when I click on them.

I tried the following in code behind:

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex != -1)
        {
            e.Row.Attributes.Add("onMouseOver", "Highlight(this)");
            e.Row.Attributes.Add("onMouseOut", "UnHighlight(this)");

            e.Row.Attributes.Add("onClick", String.Format("javascript:__doPostBack('GridView1','Select${0}')", e.Row.RowIndex));
        }
    }

Postback happens when I click on a row, but it doesn’t fires SelectedIndexChanged. In the Page_Load I get the arguments from the request:

        if (IsPostBack)
        {
            object obTarget = this.Request.Form["__EVENTTARGET"]; //GridView1
            object obArg = this.Request.Form["__EVENTARGUMENT"]; //Select$4
        }

I think that SelectedIndexChanged would have to be raised, or do i have a misunderstanding on this?

Answer 1

You are probably rebinding the GridView to its DataSource on postback. You should do that only if(!IsPostBack) (with enabled ViewState), otherwise events aren’t triggered.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        GridView1.DatSource = GetGataSource();
        GridView1.DataBind();
    }
}

You should also register event handler on every postback but RowDataBound is only called on databinding. So use RowCreated instead.

It’s also better to use Page.GetPostBackClientHyperlink instead of hardcoding the javascript function.

e.Row.Attributes["onclick"] = Page.ClientScript.GetPostBackClientHyperlink((GridView)sender, "Select$" & e.Row.RowIndex)