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Bootstrap 4 Form Theme : Added tip to get <input type="file"> displaying the selected file to upload #13727

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Dec 22, 2020
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Bootstrap 4 Form Theme : Added tip to get <input type="file"> displaying the selected file to upload #13727

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10 changes: 10 additions & 0 deletions form/bootstrap4.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,14 @@ Checkboxes and Radios
For a checkbox/radio field, calling ``form_label()`` doesn't render anything.
Due to Bootstrap internals, the label is already rendered by ``form_widget()``.

File inputs
-----------

Files input are rendered using the Bootstrap "custom-file" class.

Due to Bootstrap internals, the rendered field does not display the selected filename.
To fix that missing display, you can use the "`bs-custom-file-input`_" plugin (vanilla javascript), as recommended by `Bootstrap Forms documentation`_.

Accessibility
-------------

Expand Down Expand Up @@ -126,6 +134,8 @@ Symfony Form ``RadioType`` and ``CheckboxType`` by adding some classes to the la
{{ form_row(form.myCheckbox, {label_attr: {class: 'switch-custom'} }) }}

.. _`WCAG 2.0 standard`: https://www.w3.org/TR/WCAG20/
.. _`bs-custom-file-input`: https://www.npmjs.com/package/bs-custom-file-input
.. _`Bootstrap Forms documentation`: https://getbootstrap.com/docs/4.4/components/forms/#file-browser
.. _`custom forms`: https://getbootstrap.com/docs/4.4/components/forms/#custom-forms
.. _`custom radio`: https://getbootstrap.com/docs/4.4/components/forms/#radios
.. _`custom checkbox`: https://getbootstrap.com/docs/4.4/components/forms/#checkboxes
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