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Select2

Select2 gives you a customizable select box with support for searching, tagging, remote data sets, infinite scrolling, and many other highly used options.
Basic

Select2 was designed to be a replacement for the standard <select> box that is displayed by the browser. By default it supports all options and operations that are available in a standard select box, but with added flexibility.

<select class="js-states form-control" tabindex="-1" style="display: none; width: 100%">
    <optgroup label="Alaskan/Hawaiian Time Zone">
        <option value="AK">Alaska</option>
        <option value="HI">Hawaii</option>
    </optgroup>
    <optgroup label="Pacific Time Zone">
        <option value="CA">California</option>
        <option value="NV">Nevada</option>
        <option value="OR">Oregon</option>
        <option value="WA">Washington</option>
    </optgroup>
    <optgroup label="Mountain Time Zone">
        <option value="AZ">Arizona</option>
        <option value="CO">Colorado</option>
        <option value="ID">Idaho</option>
        <option value="MT">Montana</option>
        <option value="NE">Nebraska</option>
        <option value="NM">New Mexico</option>
        <option value="ND">North Dakota</option>
        <option value="UT">Utah</option>
        <option value="WY">Wyoming</option>
    </optgroup>
    <optgroup label="Central Time Zone">
        <option value="AL">Alabama</option>
        <option value="AR">Arkansas</option>
        <option value="IL">Illinois</option>
        <option value="IA">Iowa</option>
        <option value="KS">Kansas</option>
        <option value="KY">Kentucky</option>
        <option value="LA">Louisiana</option>
        <option value="MN">Minnesota</option>
        <option value="MS">Mississippi</option>
        <option value="MO">Missouri</option>
        <option value="OK">Oklahoma</option>
        <option value="SD">South Dakota</option>
        <option value="TX">Texas</option>
        <option value="TN">Tennessee</option>
        <option value="WI">Wisconsin</option>
    </optgroup>
    <optgroup label="Eastern Time Zone">
        <option value="CT">Connecticut</option>
        <option value="DE">Delaware</option>
        <option value="FL">Florida</option>
        <option value="GA">Georgia</option>
        <option value="IN">Indiana</option>
        <option value="ME">Maine</option>
        <option value="MD">Maryland</option>
        <option value="MA">Massachusetts</option>
        <option value="MI">Michigan</option>
        <option value="NH">New Hampshire</option>
        <option value="NJ">New Jersey</option>
        <option value="NY">New York</option>
        <option value="NC">North Carolina</option>
        <option value="OH">Ohio</option>
        <option value="PA">Pennsylvania</option>
        <option value="RI">Rhode Island</option>
        <option value="SC">South Carolina</option>
        <option value="VT">Vermont</option>
        <option value="VA">Virginia</option>
        <option value="WV">West Virginia</option>
    </optgroup>
</select>
$('select').select2();
Limiting the Number of Selections

Select2 multi-value select boxes can set restrictions regarding the maximum number of options that can be selected.

<select class="js-example-basic-multiple-limit js-states form-control" multiple="multiple" tabindex="-1" style="display: none; width: 100%">
    <optgroup label="Alaskan/Hawaiian Time Zone">
        <option value="AK">Alaska</option>
        <option value="HI">Hawaii</option>
    </optgroup>
    <optgroup label="Pacific Time Zone">
        <option value="CA">California</option>
        <option value="NV">Nevada</option>
        <option value="OR">Oregon</option>
        <option value="WA">Washington</option>
    </optgroup>
    <optgroup label="Mountain Time Zone">
        <option value="AZ">Arizona</option>
        <option value="CO">Colorado</option>
        <option value="ID">Idaho</option>
        <option value="MT">Montana</option>
        <option value="NE">Nebraska</option>
        <option value="NM">New Mexico</option>
        <option value="ND">North Dakota</option>
        <option value="UT">Utah</option>
        <option value="WY">Wyoming</option>
    </optgroup>
    <optgroup label="Central Time Zone">
        <option value="AL">Alabama</option>
        <option value="AR">Arkansas</option>
        <option value="IL">Illinois</option>
        <option value="IA">Iowa</option>
        <option value="KS">Kansas</option>
        <option value="KY">Kentucky</option>
        <option value="LA">Louisiana</option>
        <option value="MN">Minnesota</option>
        <option value="MS">Mississippi</option>
        <option value="MO">Missouri</option>
        <option value="OK">Oklahoma</option>
        <option value="SD">South Dakota</option>
        <option value="TX">Texas</option>
        <option value="TN">Tennessee</option>
        <option value="WI">Wisconsin</option>
    </optgroup>
    <optgroup label="Eastern Time Zone">
        <option value="CT">Connecticut</option>
        <option value="DE">Delaware</option>
        <option value="FL">Florida</option>
        <option value="GA">Georgia</option>
        <option value="IN">Indiana</option>
        <option value="ME">Maine</option>
        <option value="MD">Maryland</option>
        <option value="MA">Massachusetts</option>
        <option value="MI">Michigan</option>
        <option value="NH">New Hampshire</option>
        <option value="NJ">New Jersey</option>
        <option value="NY">New York</option>
        <option value="NC">North Carolina</option>
        <option value="OH">Ohio</option>
        <option value="PA">Pennsylvania</option>
        <option value="RI">Rhode Island</option>
        <option value="SC">South Carolina</option>
        <option value="VT">Vermont</option>
        <option value="VA">Virginia</option>
        <option value="WV">West Virginia</option>
    </optgroup>
</select>
$(".js-example-basic-multiple-limit").select2({
    maximumSelectionLength: 2
});
Multiple Selection

Select2 also supports multi-value select boxes.

<select class="js-states form-control" tabindex="-1" style="display: none; width: 100%" multiple="multiple">
    <optgroup label="Alaskan/Hawaiian Time Zone">
        <option value="AK">Alaska</option>
        <option value="HI">Hawaii</option>
    </optgroup>
    <optgroup label="Pacific Time Zone">
        <option value="CA">California</option>
        <option value="NV">Nevada</option>
        <option value="OR">Oregon</option>
        <option value="WA">Washington</option>
    </optgroup>
    <optgroup label="Mountain Time Zone">
        <option value="AZ">Arizona</option>
        <option value="CO">Colorado</option>
        <option value="ID">Idaho</option>
        <option value="MT">Montana</option>
        <option value="NE">Nebraska</option>
        <option value="NM">New Mexico</option>
        <option value="ND">North Dakota</option>
        <option value="UT">Utah</option>
        <option value="WY">Wyoming</option>
    </optgroup>
    <optgroup label="Central Time Zone">
        <option value="AL">Alabama</option>
        <option value="AR">Arkansas</option>
        <option value="IL">Illinois</option>
        <option value="IA">Iowa</option>
        <option value="KS">Kansas</option>
        <option value="KY">Kentucky</option>
        <option value="LA">Louisiana</option>
        <option value="MN">Minnesota</option>
        <option value="MS">Mississippi</option>
        <option value="MO">Missouri</option>
        <option value="OK">Oklahoma</option>
        <option value="SD">South Dakota</option>
        <option value="TX">Texas</option>
        <option value="TN">Tennessee</option>
        <option value="WI">Wisconsin</option>
    </optgroup>
    <optgroup label="Eastern Time Zone">
        <option value="CT">Connecticut</option>
        <option value="DE">Delaware</option>
        <option value="FL">Florida</option>
        <option value="GA">Georgia</option>
        <option value="IN">Indiana</option>
        <option value="ME">Maine</option>
        <option value="MD">Maryland</option>
        <option value="MA">Massachusetts</option>
        <option value="MI">Michigan</option>
        <option value="NH">New Hampshire</option>
        <option value="NJ">New Jersey</option>
        <option value="NY">New York</option>
        <option value="NC">North Carolina</option>
        <option value="OH">Ohio</option>
        <option value="PA">Pennsylvania</option>
        <option value="RI">Rhode Island</option>
        <option value="SC">South Carolina</option>
        <option value="VT">Vermont</option>
        <option value="VA">Virginia</option>
        <option value="WV">West Virginia</option>
    </optgroup>
</select>
$('select').select2();
Automatic Tokenization

Select2 supports ability to add choices automatically as the user is typing into the search field. Try typing in the search field below and entering a space or a comma.

<select class="js-example-tokenizer js-states form-control" multiple="multiple" tabindex="-1" style="display: none; width: 100%">
    <optgroup label="Alaskan/Hawaiian Time Zone">
        <option value="AK">Alaska</option>
        <option value="HI">Hawaii</option>
    </optgroup>
    <optgroup label="Pacific Time Zone">
        <option value="CA">California</option>
        <option value="NV">Nevada</option>
        <option value="OR">Oregon</option>
        <option value="WA">Washington</option>
    </optgroup>
    <optgroup label="Mountain Time Zone">
        <option value="AZ">Arizona</option>
        <option value="CO">Colorado</option>
        <option value="ID">Idaho</option>
        <option value="MT">Montana</option>
        <option value="NE">Nebraska</option>
        <option value="NM">New Mexico</option>
        <option value="ND">North Dakota</option>
        <option value="UT">Utah</option>
        <option value="WY">Wyoming</option>
    </optgroup>
    <optgroup label="Central Time Zone">
        <option value="AL">Alabama</option>
        <option value="AR">Arkansas</option>
        <option value="IL">Illinois</option>
        <option value="IA">Iowa</option>
        <option value="KS">Kansas</option>
        <option value="KY">Kentucky</option>
        <option value="LA">Louisiana</option>
        <option value="MN">Minnesota</option>
        <option value="MS">Mississippi</option>
        <option value="MO">Missouri</option>
        <option value="OK">Oklahoma</option>
        <option value="SD">South Dakota</option>
        <option value="TX">Texas</option>
        <option value="TN">Tennessee</option>
        <option value="WI">Wisconsin</option>
    </optgroup>
    <optgroup label="Eastern Time Zone">
        <option value="CT">Connecticut</option>
        <option value="DE">Delaware</option>
        <option value="FL">Florida</option>
        <option value="GA">Georgia</option>
        <option value="IN">Indiana</option>
        <option value="ME">Maine</option>
        <option value="MD">Maryland</option>
        <option value="MA">Massachusetts</option>
        <option value="MI">Michigan</option>
        <option value="NH">New Hampshire</option>
        <option value="NJ">New Jersey</option>
        <option value="NY">New York</option>
        <option value="NC">North Carolina</option>
        <option value="OH">Ohio</option>
        <option value="PA">Pennsylvania</option>
        <option value="RI">Rhode Island</option>
        <option value="SC">South Carolina</option>
        <option value="VT">Vermont</option>
        <option value="VA">Virginia</option>
        <option value="WV">West Virginia</option>
    </optgroup>
</select>
$(".js-example-tokenizer").select2({
    tags: true,
    tokenSeparators: [',', ' ']
});