How to get Template Field Value using Javascript

<div>
<asp:GridViewID="GridViewHourDetails"runat="server"AutoGenerateColumns="false">
<Columns>
<asp:TemplateFieldHeaderText="Name">
<ItemTemplate>
<asp:Labelrunat="server"Text='<%#Eval("Name")%>'>asp:Label>
ItemTemplate>
asp:TemplateField>
<asp:TemplateFieldHeaderText="Hours">
<ItemTemplate>
<asp:Labelrunat="server"Text='<%#Eval("Hours")%>'>asp:Label>
ItemTemplate>
asp:TemplateField>
<asp:TemplateFieldHeaderText="Reason">
<ItemTemplate>
<asp:TextBoxrunat="server"Text='<%#Eval("Reason")%>'Enabled='<%#int.Parse(Eval("Hours").ToString())<8%>'>asp:TextBox>
ItemTemplate>
asp:TemplateField>
Columns>
asp:GridView>
div>