ASP.Net double-click problem

Question

having a slight problem with an ASP.net page of mine. If a user were to double click on a \"submit\" button it will write to the database twice (i.e. carry out the \'onclick

Answer 1

If you have validation on the page, disabling the button client side gets a little tricky. If validation fails, you don't want to disable the button. Here's a snippet that adds the client side event handler:

private void BuildClickOnceButton(WebControl ctl)

{

System.Text.StringBuilder sbValid = new System.Text.StringBuilder();

sbValid.Append("if (typeof(Page_ClientValidate) == 'function') { ");

sbValid.Append("if (Page_ClientValidate() == false) { return false; }} ");

sbValid.Append(ctl.ClientID + ".value = 'Please wait...';");

sbValid.Append(ctl.ClientID + ".disabled = true;");

// GetPostBackEventReference obtains a reference to a client-side script 
// function that causes the server to post back to the page.

sbValid.Append(ClientScript.GetPostBackEventReference(ctl, ""));

sbValid.Append(";");

ctl.Attributes.Add("onclick", sbValid.ToString());

}

See this asp.net thread for more info.

Update: the above code would be used to add the OnClientClick handler in code behind. You could also write the javascript in your aspx markup like so: