How to add class to a jQuery element if a condition is true and remove the same class if the condition is false?

Question

Is there a shorter way to do the following?

var select_all_checkbox = $("input.select_all");
var is_checked = select_all_checkbox.prop("checked");

if (is_checked) {
    select_all_checkbox.parent().addClass("selected");
} else {
    select_all_checkbox.parent().removeClass("selected");
}

Answer 1

Use toggleClass, passing a second argument (a boolean) that specifies whether the class should be added or not:

select_all_checkbox.parent().toggleClass("selected", is_checked);

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If you have multiple elements selected by input.select_all, you have to iterate over them though:

$("input.select_all").each(function() {
    $(this).parent().toggleClass('selected', this.checked);
});