Theme for data collection in Symfony forms

form-collection.html.twig

{% use "bootstrap_3_layout.html.twig" %}

{%- block collection_widget -%}

    {% if prototype is defined %}
        {%- set attr = attr|merge({'data-prototype': form_row(prototype) }) -%}
    {% endif %}

    <div class="panel panel-default">
        <div class="panel-body">
            <table class="table table-bordered">
                <thead>
                    <tr>
                        <th></th>
                        {{ form_label(form) }}
                        <th></th>
                    </tr>
                </thead>
                {%- if form.parent is empty and errors|length > 0 -%}
                <tr>
                    <td colspan="2">{{- form_errors(form) -}}</td>
                </tr>
                {%- endif -%}
                <tbody {{ block('widget_container_attributes') }}>
                    {% for child in form %}
                    <tr>
                        <td>{{ child.vars.value.id }}</td>
                        {{ form_widget(child) }}
                        <td class="text-center">
                            <div class="btn-group">
                                <button type="button" class="btn btn-default">
                                  <span class="glyphicon glyphicon-trash"></span>
                                </button>
                            </div>
                        </td>
                    </tr>
                    {% endfor %}
                </tbody>
            </table>
            <button type="button" class="btn btn-default">
              <span class="glyphicon glyphicon-plus-sign"></span> Add
            </button>
        </div>
    </div>
{%- endblock collection_widget -%}

{%- block form_row -%}
{% spaceless %}
<td>
    {{- form_errors(form) -}}
    {{- form_widget(form) -}}

</td>
      {% endspaceless %}
{%- endblock form_row -%}

{%- block form_label -%}
    {% if label is not same as(false) -%}
        {% if not compound -%}
            {% set label_attr = label_attr|merge({'for': id}) %}
        {%- endif -%}
        {% if required -%}
            {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' required')|trim}) %}
        {%- endif -%}
        {% if label is empty -%}
            {%- if label_format is not empty -%}
                {% set label = label_format|replace({
                    '%name%': name,
                    '%id%': id,
                }) %}
            {%- else -%}
                {% set label = name|humanize %}
            {%- endif -%}
        {%- endif -%}
        <th{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}</th>
    {%- endif -%}
{%- endblock form_label -%}