Question

This element

<asp:DropDownList ID="ItemDropDownList" runat="server" AutoPostBack="true" OnChange="setHidden()" .... >

Doesn’t do postback when I use OnChange attribute. Even if I do it manually:

function setHidden() {
  ...
  ...
  _doPostBack("","");
}

What’s wrong?

Answer 1

Use return statement instead of doing post back.

<asp:DropDownList ID="ItemDropDownList"  runat="server"  AutoPostBack="true" 
     OnChange="return setHidden()" .... >

function setHidden() {
     ...
     ....
    return true; // you can return false to stop postback
}