Disable button on form submission

Question

I have a button that I would like to disable when the form submits to prevent the user submitting multiple times.

I have tried naively disabling the button with java

Answer 1

Note that rp's approach will double submit your form if you are using buttons with UseSubmitBehavior="false".

I use the following variation of rp's code:

public static void DisableButtonOnClick(Button button, string clientFunction)
{
    // If the page has ASP.NET validators on it, this code ensures the
    // page validates before continuing.
    string script = "if (typeof(Page_ClientValidate) == 'function') { "
            + "if (!Page_ClientValidate()) { return false; } } ";

    // disable the button
    script += "this.disabled = true; ";

    // If a secondary JavaScript function has been provided, and if it can be found, call it.
    // Note the name of the JavaScript function to call should be passed without parens.
    if (!string.IsNullOrEmpty(clientFunction))
        script += string.Format("if (typeof({0}) == 'function') {{ {0}() }} ", clientFunction);

    // only need to post back if button is using submit behaviour
    if (button.UseSubmitBehavior)
        script += button.Page.GetPostBackEventReference(button) + "; ";

    button.Attributes.Add("onclick", script);
}