firefly-iii/resources/views/form/amount.twig

<div class="{{ classes }}" id="{{ name }}_holder">
    <label for="{{ options.id }}" class="col-sm-4 control-label">{{ label }}</label>

    <div class="col-sm-8">
        <div class="input-group">
            <div class="input-group-btn">
                <button type="button"
                        class="btn btn-default dropdown-toggle currency-dropdown" id="currency_dropdown_{{ name }}" data-toggle="dropdown"
                        aria-expanded="false">
                    <span id="currency_select_symbol_{{ name }}">{{ defaultCurrency.symbol|raw }}</span> <span class="caret"></span>
                </button>
                <ul class="dropdown-menu currency-dropdown-menu" role="menu">
                    {% for currency in currencies %}
                        <li>
                            <a href="#"
                               class="currency-option"
                               data-id="{{ currency.id }}"
                               data-name="{{ name }}"
                               data-currency="{{ currency.code }}"
                               data-symbol="{{ currency.symbol|raw }}">{{ currency.name }}</a></li>
                    {% endfor %}
                </ul>
            </div>
            {{ Form.input('number', name, value, options) }}


        </div>

        {% include 'form.feedback' %}
    </div>
    <!-- Going to put in this value: {{ defaultCurrency.id }} -->
    <input type="hidden" name="amount_currency_id_{{ name }}" value="{{ defaultCurrency.id }}" data-backup="{{ defaultCurrency.id }}"/>
</div>