Question

iv’e got an asp button which performs another task besides postback

i have done this by adding javascript code to the button as follows

       if( !IsPostBack )
            btn1.Attributes.Add("onclick", "f();");

i’m not sure of 2 things

the first :

where in the cs code i should add the function f() , currently i’m doing it in page load
while ignoring postbacks because then the function would have already been added(i might be wrong)

the second :

is there any to make the function execute only if the page was validated ? (after postback)

thanks in advance
eran.

Answer 1

I would use OnClientClick instead of adding the click event throug the attributes. As for your JavaScript, I would add it in the ASPX part. Depending on what the function does, you might be able to avoid the code behind all together and do something like this:

<asp:Button ID="Button1" runat="server" Text="Hi" OnClientClick="javascript:return f();" OnClick="Button1_Click" />

From your f() function, kick off the validation, and return true if validation passes, otherwise return false. If OnClientClick returns true the page will post back, and if it returns false the page will not post back.