Ekdant-Online-Store/catalog/view/template/checkout/shipping_method.twig

<fieldset>
  <legend>{{ heading_title }}</legend>
  <div class="input-group">
    <span class="input-group-text"><i class="fa fa-truck"></i></span><input type="text" name="shipping_method" value="{{ shipping_method }}" placeholder="{{ entry_shipping_method }}" id="input-shipping-method" class="form-control" readonly/>
    <button type="button" id="button-shipping-methods" class="btn btn-primary">{{ button_choose }}</button>
  </div>
  <input type="hidden" name="code" value="{{ code }}" id="input-shipping-code"/>
  <div id="error-shipping-method" class="invalid-feedback"></div>
</fieldset>
<script type="text/javascript"><!--
$('#button-shipping-methods').on('click', function() {
    var element = this;

    chain.attach(function() {
        return $.ajax({
            url: 'index.php?route=checkout/shipping_method.quote&language={{ language }}',
            dataType: 'json',
            beforeSend: function() {
                $(element).button('loading');
            },
            complete: function() {
                $(element).button('reset');
            },
            success: function(json) {
                console.log(json);

                $('#input-shipping-method').removeClass('is-invalid');
                $('#error-shipping-method').removeClass('d-block');

                if (json['error']) {
                    $('#input-shipping-method').addClass('is-invalid');
                    $('#error-shipping-method').html(json['error']).addClass('d-block');
                }

                if (json['shipping_methods']) {
                    $('#modal-shipping').remove();

                    html = '<div id="modal-shipping" class="modal">';
                    html += '  <div class="modal-dialog modal-dialog-centered">';
                    html += '    <div class="modal-content">';
                    html += '      <div class="modal-header">';
                    html += '        <h5 class="modal-title"><i class="fa fa-truck"></i> {{ text_shipping_method|escape('js') }}</h5>';
                    html += '        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>';
                    html += '      </div>';
                    html += '      <div class="modal-body">';
                    html += '        <form id="form-shipping-method">';
                    html += '          <p>{{ text_shipping|escape('js') }}</p>';

                    for (i in json['shipping_methods']) {
                        html += '<p><strong>' + json['shipping_methods'][i]['name'] + '</strong></p>';

                        if (!json['shipping_methods'][i]['error']) {
                            for (j in json['shipping_methods'][i]['quote']) {
                                html += '<div class="form-check">';

                                var code = i + '-' + j.replaceAll('_', '-');

                                html += '<input type="radio" name="shipping_method" value="' + json['shipping_methods'][i]['quote'][j]['code'] + '" id="input-shipping-method-' + code + '"';

                                if (json['shipping_methods'][i]['quote'][j]['code'] == $('#input-shipping-code').val()) {
                                    html += ' checked';
                                }

                                html += '/>';
                                html += '  <label for="input-shipping-method-' + code + '">' + json['shipping_methods'][i]['quote'][j]['name'] + ' - ' + json['shipping_methods'][i]['quote'][j]['text'] + '</label>';
                                html += '</div>';
                            }
                        } else {
                            html += '<div class="alert alert-danger">' + json['shipping_methods'][i]['error'] + '</div>';
                        }
                    }

                    html += '          <div class="text-end">';
                    html += '            <button type="submit" id="button-shipping-method" class="btn btn-primary">{{ button_continue|escape('js') }}</button>';
                    html += '          </div>';
                    html += '        </form>';
                    html += '      </div>';
                    html += '    </div>';
                    html += '  </div>';
                    html += '</div>';

                    $('body').append(html);

                    $('#modal-shipping').modal('show');
                }
            },
            error: function(xhr, ajaxOptions, thrownError) {
                console.log(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
            }
        });
    });
});

$(document).on('submit', '#form-shipping-method', function(e) {
    e.preventDefault();

    var element = this;

    chain.attach(function() {
        return $.ajax({
            url: 'index.php?route=checkout/shipping_method.save&language={{ language }}',
            type: 'post',
            data: $('#form-shipping-method').serialize(),
            dataType: 'json',
            contentType: 'application/x-www-form-urlencoded',
            beforeSend: function() {
                $('#button-shipping-method').button('loading');
            },
            complete: function() {
                $('#button-shipping-method').button('reset');
            },
            success: function(json) {
                console.log(json);

                if (json['redirect']) {
                    location = json['redirect'];
                }

                if (json['error']) {
                    $('#alert').prepend('<div class="alert alert-danger alert-dismissible"><i class="fa-solid fa-circle-exclamation"></i> ' + json['error'] + ' <button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>');
                }

                if (json['success']) {
                    $('#alert').prepend('<div class="alert alert-success alert-dismissible"><i class="fa-solid fa-circle-check"></i> ' + json['success'] + ' <button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>');

                    $('#modal-shipping').modal('hide');

                    $('#input-shipping-method').val($('input[name=\'shipping_method\']:checked').parent().find('label').text());
                    $('#input-shipping-code').val($('input[name=\'shipping_method\']:checked').val());

                    $('#input-payment-method').val('');

                    $('#checkout-confirm').load('index.php?route=checkout/confirm.confirm&language={{ language }}');
                }
            },
            error: function(xhr, ajaxOptions, thrownError) {
                console.log(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
            }
        });
    });
});
//--></script>