ServerTags don't work in OnClientClick

<asp:button runat="server" Text="Save as" OnClick="btnSave_click" 
OnClientClick="if(!Check('<% # tb.ClientID %>')) return false; return Object();" 
CausesValidation="false">开发者_开发知识库;</asp:button>

<asp:TextBox runat="server" ID="tb"></asp:TextBox>

Server tags don't work here. I spend a 1-2 hours to find some way to make this work, but i didn't find anything.

Server tags works in:

<OnClientClick="JSFunc();"

<script type="text/javascript">
    function JSFunc()
    {
         var el = document.getElementById('<% # tb.ClientID %>');
         //some actions with el here
    }
</script>

or something others with c#.

Is There no way to make server tags working inline? (first example)

ps. Sorry for the bad English

first off in your javascript it should be:

<%= tb.ClientID %>

Note the "=" sign

Secondly, you will also have to call DataBind() Method on your page_load if you wish to do it inline.

Using an expression builder, you don't need to call databind and you can inline this quite easliy.

see here