Calling ClientID from aspx

Question

Hi, i have this:

<input type="checkbox" id="chbSaveState" runat="server" tabindex="3" 
onchange="SaveState(""<%=  chbSaveState.ClientID %>"")" />

that doesn't work, the error says: Parser Error Message: Server tags cannot contain <% ... %> constructs.

Any aproaches to solve this ? Thank you ;)

Answer 1

I don't have much experience with server side controls, but perhaps:

<input type="checkbox" id="chbSaveState" runat="server" tabindex="3" 
onchange="SaveState(chbSaveState.ClientID)" />

Answer 2

You're calling a JS event (onchange), not a server event, so just pass in this.id.

<input type="checkbox" id="chbSaveState" runat="server" tabindex="3"  
onchange="SaveState(this.id)" /> 

To be clear, this.id and <%=chbSaveState.ClientID%> will return the same value in this case. Since you're calling this on an event of chbSaveState, you can just use the easily accessible JS property here, rather than <%=chbSaveState.ClientID%>, which requires the server to return the id which is generated by the server for that control.

Answer 3

you could do that using jQuery like this:

var control = '#<%= chbSAveState.ClientID%>';
$(control).change(function(){
    SaveState($(this).id);
});