Question

$("input").each(function() {
    if ($(this).hasClass('valid')) {
        // Do something
    }
});

The Code above determines if input has a specified class. However, how could I change the if statement to make it do something when input doesn’t have a specified class?

Answer 1

You can do it inside with a ! negation like this:

$("input").each(function() {
    if (!$(this).hasClass('valid')) {
        // Do something
    }
});

Or just use :not() when selecting those elements, like this:

$("input:not(.valid)").each(function() {
    // Do something
});

This means your original code can also be slimmer (for when it does have the class), like this:

$("input.valid").each(function() {
    // Do something
});