Basic

Use select2() function on select element to convert it to Select 2.

<select class="form-control  basic">
    <option selected="selected">orange</option>
    <option>white</option>
    <option>purple</option>
</select>

var ss = $(".basic").select2({
    tags: true,
});

Small Select2

Use data('select2') function to get container of select2.

<select class="form-control form-small">
    <option selected="selected">orange</option>
    <option>white</option>
    <option>purple</option>
</select>

var formSmall = $(".form-small").select2({ tags: true });
formSmall.data('select2').$container.addClass('form-control-sm')

Nested

Add options inside the optgroups to for group options.

<select class="form-control nested">
    <optgroup label="Group1">
        <option selected="selected">orange</option>
        <option>white</option>
        <option>purple</option>
    </optgroup>
    <optgroup label="Group2">
        <option>purple</option>
        <option>orange</option>
        <option>white</option>
    </optgroup>
    <optgroup label="Group3">
        <option>white</option>
        <option>purple</option>
        <option>orange</option>
    </optgroup>
</select>

$(".nested").select2({
    tags: true
});

Disabling options

Disable Select using disabled attribute.

<select class="form-control disabled-results">
    <option value="one">First</option>
    <option value="two" disabled="disabled">Second</option>
    <option value="three">Third</option>
</select>

$(".disabled-results").select2();

Placeholder

Apply Placeholder by setting option placeholder option.

<select class="placeholder js-states form-control">
    <option>Choose...</option>
    <option value="one">First</option>
    <option value="two">Second</option>
    <option value="three">Third</option>
    <option value="four">Fourth</option>
    <option value="five">Fifth</option>
</select>

$(".placeholder").select2({
    placeholder: "Make a Selection",
    allowClear: true
});

Tagging with multi-value select boxes

Set tags: true to convert select 2 in Tag mode.

<select class="form-control tagging" multiple="multiple">
    <option>orange</option>
    <option>white</option>
    <option>purple</option>
</select>

$(".tagging").select2({
    tags: true
});

Limiting the number of Tagging

Set maximumSelectionLength: 2 with tags: true to limit selectin in Tag mode.

<select class="form-control tagging" multiple="multiple">
    <option>orange</option>
    <option>white</option>
    <option>purple</option>
</select>

var ss = $(".basic").select2({
    tags: true,
});

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