Standard select boxes
Use .selectpicker class on select element to convert it to Bootstrap Select.
<select class="selectpicker">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Select boxes with optgroups
Add options inside the optgroups to for group options
<select class="selectpicker">
    <optgroup label="Picnic">
        <option>Mustard</option>
        <option>Ketchup</option>
        <option>Relish</option>
    </optgroup>
    <optgroup label="Camping">
        <option>Tent</option>
        <option>Flashlight</option>
        <option>Toilet Paper</option>
    </optgroup>
</select>
                                        Multiple select boxes
Add multiselect attribute to for multi-selection
<select class="selectpicker" multiple>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Live search
You can add a search input by passing data-live-search="true" attribute
<select class="selectpicker" data-live-search="true">
    <option>Fries</option>
    <option>Burger, Shake and a Smile</option>
    <option>Sugar, Spice and all things nice</option>
</select>
                                        Keywords
Add key words to options to improve their searchability using data-tokens.
<select class="selectpicker" data-live-search="true">
    <option data-tokens="ketchup mustard">Hot Dog</option>
    <option data-tokens="mustard">Burger, Shake and a Smile</option>
    <option data-tokens="frosting">Sugar, Spice and all things nice</option>
</select>
                                        Limit the number of selections
Limit the number of options that can be selected via the  data-max-options.
<select class="selectpicker" multiple data-max-options="2">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Limit the number of selections in groups
Limit the number of group that can be selected using  maxOptionsText.
<select class="selectpicker" multiple>
    <optgroup label="Condiments" data-max-options="2">
        <option>ustard^</option>
        <option>etchup^</option>
        <option>elish^</option>
    </optgroup>
    <optgroup label="Breads" data-max-options="2">
        <option>lain^</option>
        <option>teamed^</option>
        <option>oasted^</option>
    </optgroup>
</select>
                                        Placeholder
Using the title attribute will set the default placeholder.
<select class="selectpicker" multiple title="Choose options">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Selected text
Set the title attribute on individual options to display alternative text when the option is selected
<select class="selectpicker">
    <option title="Combo 1">Hot Dog, Fries and a Soda</option>
    <option title="Combo 2">Burger, Shake and a Smile</option>
    <option title="Combo 3">Sugar, Spice and all things nice</option>
</select>
                                        Selected text format
Specify how the selection is displayed with the  data-selected-text-format attribute on a multiple select
<select class="selectpicker" multiple data-selected-text-format="count">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Selected text format
count > x : Where x is the number of items selected when the display format changes from values to count.
<select class="selectpicker" multiple data-selected-text-format="count > 3">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Onions</option>
</select>
                                        Style individual options
Classes and styles added to options are transferred to the select box.
<select class="selectpicker">
    <option>Mustard</option>
    <option class="bg-danger">Ketchup</option>
    <option style="background: #1abc9c; color: #fff;">Relish</option>
</select>
                                        Custom content
Insert custom HTML into the option with the data-content attribute
<select class="selectpicker">
    <option data-content="<span class='badge badge-primary'>Primary</span>">Primary</option>
    <option data-content="<span class='badge badge-secondary'>Secondary</span>">Secondary</option>
    <option data-content="<span class='badge badge-success'>Success</span>">Success</option>
    <option data-content="<span class='badge badge-warning'>Warning</span>">Warning</option>
</select>
                                        Show Subtext
Add subtext to an option or optgroup with the  data-subtext attribute.
<select class="selectpicker" data-show-subtext="true">
    <option data-subtext="French's">Mustard</option>
    <option data-subtext="Heinz">Ketchup</option>
    <option data-subtext="Sweet">Relish</option>
    <option data-subtext="Miracle Whip">Mayonnaise</option>
    <option data-divider="true">divider</option>
    <option data-subtext="Honey">Barbecue Sauce</option>
    <option data-subtext="Ranch">Salad Dressing</option>
    <option data-subtext="Sweet & Spicy">Tabasco</option>
    <option data-subtext="Chunky">Salsa</option>
</select>
                                        Menu size
The size of the menu can also be specifed using the data-size attribute.
<select class="selectpicker" data-size="5">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
</select>
                                        Select / Deselect all options
Adds two buttons to the top of the menu - Select All & Deselect All with data-actions-box="true"
<select class="selectpicker" multiple data-actions-box="true">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Divider
Add data-divider="true" to an option to turn it into a divider.
<select class="selectpicker">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option data-divider="true">divider</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
</select>
                                        Menu header
Add a header to the dropdown menu data-header="Select a condiment"
<select class="selectpicker" data-header="Select a condiment"  data-size="5">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
    <option>Barbecue Sauce</option>
    <option>Salad Dressing</option>
    <option>Tabasco</option>
    <option>Salsa</option>
</select>
                                        Dropup menu
Add dropupAuto to automatically change postion according to window.
<select class="selectpicker dropup">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Mayonnaise</option>
</select>
                                        Disabled
Disabled select box
Disable Select box using disabled attribute on select element.
<select class="selectpicker" disabled>
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
</select>
                                        Disabled options
Disable Select Option using disabled attribute on select option element.
<select class="selectpicker">
    <option>Mustard</option>
    <option disabled>Ketchup</option>
    <option>Relish</option>
</select>
                                        Disabled options groups
Disable Select Group using disabled attribute on select optgroup element
<select class="selectpicker test">
    <optgroup label="Picnic" disabled>
        <option>Mustard</option>
        <option>Ketchup</option>
        <option>Relish</option>
    </optgroup>
    <optgroup label="Camping">
        <option>Tent</option>
        <option>Flashlight</option>
        <option>Toilet Paper</option>
    </optgroup>
</select>
                                        Styling
Styling
You can set the button classes via the data-style attribute
<select class="selectpicker mb-4 ml-2" data-style="btn btn-outline-primary">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
    <option>Onions</option>
</select>
                                        Width
Grid
Wrap selects in grid columns, or any custom parent element, to easily enforce desired widths.
<div class="row">
    <div class="col-sm-3 col-12">
        <div class="form-group">
            <select class="selectpicker form-control">
                <option>Mustard</option>
                <option>Ketchup</option>
                <option>Relish</option>
            </select>
        </div>
    </div>
    <div class="col-sm-9 col-12">
        <div class="form-group">
            <select class="selectpicker form-control">
                <option>Mustard</option>
                <option>Ketchup</option>
                <option>Relish</option>
            </select>
        </div>
    </div>
</div>
                                        Custom Width
use the data-width attribute to set the width of the select
Data Width = "fit"
Data Width = "200px"
Data Width = "75%"
==================
Data Width = "fit"
==================
<div class="col-sm-12">
    <select class="selectpicker mb-4" data-width="fit">
        <option>Mustard</option>
        <option>Ketchup</option>
        <option>Relish</option>
        <option>Onions</option>
    </select>
</div>
==================
Data Width = "200px"
==================
<div class="col-sm-12">
    <select class="selectpicker mb-4" data-width="200px">
        <option>Mustard</option>
        <option>Ketchup</option>
        <option>Relish</option>
        <option>Onions</option>
    </select>
</div>
==================
Data Width = "75%"
==================
<div class="col-sm-12">
    <select class="selectpicker mb-4" data-width="75%">
        <option>Mustard</option>
        <option>Ketchup</option>
        <option>Relish</option>
        <option>Onions</option>
    </select>
</div>
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