dropdownlist selected value don't work
 

why this code work fine

function OnChangeAction()
{
var e = document.getElementById('<%=ddlSelectItems.ClientI D %>');
var selVal = e.options[e.selectedIndex].value;
SelectAll(selVal);
}

and this code not work

function OnChangeAction()
{
var selVal = $("id$=ddlSelectItems option:selected").text();
SelectAll(selVal);
}


<asp:DropDownList ID="ddlSelectItems" runat="server"
onchange="OnChangeAction();">
</asp:DropDownList>

SelectAll function work fine.

No need to show a hodgepodge of languages. Show only JS in browser.

Why this code not work?

function OnChangeAction()
{
var selVal = $("id$=ddlSelectItems option:selected").text();
SelectAll(selVal);
}

val также не работает

Значит указан неправильный селектор.