multiple attribute.
<option> element:
<option> elements can be grouped by wrapping them with in an <optgroup> element:
disabled attribute is set) and from remote sources, where the object has disabled: true set.
multiple attribute with maximumSelectionLength in the select2 options.
true, causes a clear button ("x" icon) to appear on the select box when a value is selected. Clicking the clear button will clear the selected value, effectively resetting the select box back to its placeholder value.
dir attribute is set on the <select> or any parents of it. You can also initialize Select2 with the dir: "rtl" configuration option.