Add dynamic placeholder theme

[alexander-schranz]

Q	A
Bug?	no
New Feature?	yes
Bundle Version	1.0.0-RC3

Actual Behavior

Actually there is no theme where the labels are set as input.

Expected Behavior

There should be set a theme where the labels are set as inputs

Possible Solutions

{% extends 'SuluFormBundle:themes:dynamic.html.twig' %}

{%- block form_row -%}
    {{ block('sulu_form_row_start') }}
    {{- form_label(form, null, {label_attr: { class: 'sr-only' }} ) -}}
    {{- form_errors(form) -}}
    {{- form_widget(form, { attr: { placeholder: label|strip_tags } }) -}}
    {{ block('sulu_form_row_end') }}
{%- endblock -%}

{%- block choice_row -%}
    {{ block('sulu_form_row_start') }}
    {{- form_label(form) -}}
    {{- form_errors(form) -}}
    {{- form_widget(form) -}}
    {{ block('sulu_form_row_end') }}
{%- endblock -%}

{%- block checkbox_row -%}
    {{ block('sulu_form_row_start') }}
    {{- form_errors(form) -}}
    {{- form_widget(form) -}}
    {{- form_label(form) -}}
    {{ block('sulu_form_row_end') }}
{%- endblock -%}

You need to add a .sr-only class for accessibility. ( http://a11yproject.com/posts/how-to-hide-content/ )