Question

I am trying with this, but it is undignified.

In html.

 <BDP:BasicDatePicker ID="DOBpicker" runat="server" CssClass="txtBox" DisplayType="TextBox"
  ValidationGroup="userRegistration" /> 

in jquery, I tried with this

 function btn()
{
  var date = $('#DOBpicker').val();
  alert(date);
}

or

function btn()
{
  var date = document.getElementById('DOBpicker').value;
  alert(date);
}

call this function on btn

<input id="test" type="button" value="go" onclick="btn()" />

But it undefined.

Answer 1

Try attr() instead of val(). See demo here
You have to have value otherwise it doesn’t fire anything or just undefined. For instance I have added value="Hello World"

<BDP:BasicDatePicker ID="DOBpicker" runat="server" CssClass="txtBox" DisplayType="TextBox"
  ValidationGroup="userRegistration" value="Hello World" /> 

var date = $('#DOBpicker').attr('value');

alert(date);​