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Validation

Valid fields

`.was-validated`

    
<form class="was-validated mb-3">
    <select class="form-select" id="valid-was-validated-single-field" data-placeholder="Choose one thing">
        <option></option>
        <option>Reactive</option>
        <option>Solution</option>
        <option>Conglomeration</option>
        <option>Algoritm</option>
        <option>Holistic</option>
    </select>
</form>

<form class="was-validated mb-3">
    <select class="form-select" data-placeholder="Choose anything" id="valid-was-validated-multiple-field" multiple>
        <option>Christmas Island</option>
        <option>South Sudan</option>
        <option>Jamaica</option>
        <option>Kenya</option>
        <option>French Guiana</option>
        <option>Mayotta</option>
        <option>Liechtenstein</option>
        <option>Denmark</option>
        <option>Eritrea</option>
        <option>Gibraltar</option>
        <option>Saint Helena, Ascension and Tristan da Cunha</option>
        <option>Haiti</option>
        <option>Namibia</option>
        <option>South Georgia and the South Sandwich Islands</option>
        <option>Vietnam</option>
        <option>Yemen</option>
        <option>Philippines</option>
        <option>Benin</option>
        <option>Czech Republic</option>
        <option>Russia</option>
    </select>
</form>

    
$( '#valid-was-validated-single-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
} );

$( '#valid-was-validated-multiple-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
    closeOnSelect: false,
} );

`.is-valid`

    
<div class="mb-3">
    <select class="form-select is-valid" id="valid-is-valid-single-field" data-placeholder="Choose one thing">
        <option></option>
        <option>Reactive</option>
        <option>Solution</option>
        <option>Conglomeration</option>
        <option>Algoritm</option>
        <option>Holistic</option>
    </select>
</div>

<div class="mb-3">
    <select class="form-select is-valid" data-placeholder="Choose anything" id="valid-is-valid-multiple-field" multiple>
        <option>Christmas Island</option>
        <option>South Sudan</option>
        <option>Jamaica</option>
        <option>Kenya</option>
        <option>French Guiana</option>
        <option>Mayotta</option>
        <option>Liechtenstein</option>
        <option>Denmark</option>
        <option>Eritrea</option>
        <option>Gibraltar</option>
        <option>Saint Helena, Ascension and Tristan da Cunha</option>
        <option>Haiti</option>
        <option>Namibia</option>
        <option>South Georgia and the South Sandwich Islands</option>
        <option>Vietnam</option>
        <option>Yemen</option>
        <option>Philippines</option>
        <option>Benin</option>
        <option>Czech Republic</option>
        <option>Russia</option>
    </select>
</div>

    
$( '#valid-is-valid-single-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
} );

$( '#valid-is-valid-multiple-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
    closeOnSelect: false,
} );

Invalid fields

`.was-validated`

    
<form class="was-validated mb-3">
    <select class="form-select" id="invalid-was-validated-single-field" data-placeholder="Choose one thing" required>
        <option></option>
        <option>Reactive</option>
        <option>Solution</option>
        <option>Conglomeration</option>
        <option>Algoritm</option>
        <option>Holistic</option>
    </select>
</form>

<form class="was-validated mb-3">
    <select class="form-select" data-placeholder="Choose anything" id="invalid-was-validated-multiple-field" multiple required>
        <option>Christmas Island</option>
        <option>South Sudan</option>
        <option>Jamaica</option>
        <option>Kenya</option>
        <option>French Guiana</option>
        <option>Mayotta</option>
        <option>Liechtenstein</option>
        <option>Denmark</option>
        <option>Eritrea</option>
        <option>Gibraltar</option>
        <option>Saint Helena, Ascension and Tristan da Cunha</option>
        <option>Haiti</option>
        <option>Namibia</option>
        <option>South Georgia and the South Sandwich Islands</option>
        <option>Vietnam</option>
        <option>Yemen</option>
        <option>Philippines</option>
        <option>Benin</option>
        <option>Czech Republic</option>
        <option>Russia</option>
    </select>
</form>

    
$( '#invalid-was-validated-single-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
} );

$( '#invalid-was-validated-multiple-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
    closeOnSelect: false,
} );

`.is-invalid`

    
<div class="mb-3">
    <select class="form-select is-invalid" id="invalid-is-invalid-single-field" data-placeholder="Choose one thing">
        <option></option>
        <option>Reactive</option>
        <option>Solution</option>
        <option>Conglomeration</option>
        <option>Algoritm</option>
        <option>Holistic</option>
    </select>
</div>

<div class="mb-3">
    <select class="form-select is-invalid" data-placeholder="Choose anything" id="invalid-is-invalid-multiple-field" multiple>
        <option>Christmas Island</option>
        <option>South Sudan</option>
        <option>Jamaica</option>
        <option>Kenya</option>
        <option>French Guiana</option>
        <option>Mayotta</option>
        <option>Liechtenstein</option>
        <option>Denmark</option>
        <option>Eritrea</option>
        <option>Gibraltar</option>
        <option>Saint Helena, Ascension and Tristan da Cunha</option>
        <option>Haiti</option>
        <option>Namibia</option>
        <option>South Georgia and the South Sandwich Islands</option>
        <option>Vietnam</option>
        <option>Yemen</option>
        <option>Philippines</option>
        <option>Benin</option>
        <option>Czech Republic</option>
        <option>Russia</option>
    </select>
</div>

    
$( '#invalid-is-invalid-single-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
} );

$( '#invalid-is-invalid-multiple-field' ).select2( {
    theme: "bootstrap-5",
    width: $( this ).data( 'width' ) ? $( this ).data( 'width' ) : $( this ).hasClass( 'w-100' ) ? '100%' : 'style',
    placeholder: $( this ).data( 'placeholder' ),
    closeOnSelect: false,
} );