firefly-iii/resources/views/transactions/links/modal.twig

<form action="{{ route('transactions.link.store', [journal.id]) }}" method="post" class="form-horizontal">
    <input type="hidden" name="_token" value="{{ csrf_token() }}">
    <input type="hidden" name="opposing" value="">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <h4 class="modal-title">{{ 'link_to_other_transaction'|_ }}</h4>
            </div>
            <div class="modal-body" id="helpBody">
                <p>{{ 'select_transaction_to_link'|_ }}</p>
                <div class="form-group">
                    <label for="link_type" class="col-sm-4 control-label">{{ 'this_transaction'|_ }}</label>
                    <div class="col-sm-8">
                        <select id="link_type" class="form-control" name="link_type">
                            {% for linkType in linkTypes %}
                                <option label="{{ journalLinkTranslation('inward', linkType.inward) }}"
                                        value="{{ linkType.id }}_inward">{{ journalLinkTranslation('inward', linkType.inward) }}</option>
                                <option label="{{ journalLinkTranslation('outward', linkType.outward) }}"
                                        value="{{ linkType.id }}_outward">{{ journalLinkTranslation('outward', linkType.outward) }}</option>
                            {% endfor %}
                        </select>
                    </div>
                </div>
                <div class="form-group" id="journal-selection">
                    <label for="selected" class="col-sm-4 control-label">{{ 'selected_transaction'|_ }}</label>
                    <div class="col-sm-8">
                        <p class="form-control-static" id="selected-journal">
                        </p>
                    </div>
                </div>
                <div class="form-group" id="journal-selector">
                    <label for="link_other" class="col-sm-4 control-label">{{ 'transaction'|_ }}</label>
                    <div class="col-sm-8">
                        <input type="text" name="link_other" autocomplete="off" id="link_other" value="" class="form-control link-journal">
                    </div>
                </div>
                <div class="form-group">
                    <label for="notes" class="col-sm-4 control-label">{{ 'link_notes'|_ }}</label>
                    <div class="col-sm-8">
                        <textarea id="notes" name="notes" class="form-control"></textarea>
                    </div>
                </div>


            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">{{ 'close'|_ }}</button>
                <button type="submit" class="btn btn-primary">{{ 'submit'|_ }}</button>
            </div>
        </div>
    </div>
</form>