entity reference view widget doesn't work with theme bootstrap

This issue queue isn't for support or debugging integration with other modules. Not all modules are supported out-of-the-box. Most of the time, the issue is with the module itself rather than the theme (despite it working in other, "core", themes) due to how they implement core APIs (or lack thereof).

I modified form-element.func.php as @lazzyvn mentioned but I think this needs a bit more attention...

Expected html output:

<div class="form-item ...">
  <label class="control-label" for="..."><input type="checkbox" id="..." name="..." value="..." class="form-checkbox">Test</label>
</div>

The actual html output:

<div class="form-item ...">
  <label class="option" for="..."><input type="checkbox" id="..." name="..." value="..." class="form-checkbox">Test</label>
  <label class="control-label" for="..."><input type="checkbox" id="..." name="..." value="..." class="form-checkbox"></label>
</div>

Sorry, it seems that 2 labels are created on node add/edit form and 1 checkbox.
To simplify it, instead of

<div>
  <label><input>Test</label>
</div>

I get this

<div>
  <label>Test</label>
  <label><input></label>
</div>

I tried add field_suffix and field_prefix in bootstrap/templates/system/form-element-label.func.php. That is ok for me. Please help me to review it if it's correct. Thanks a lot :) Bootstrap theme version 7.x-3.5

// Inject the rendered checkbox or radio element inside the label.
    if (!empty($element['#children'])) {

      //Thlo added for checkbox and radio bootstrap theme. The question is how impact other checkbox and radios
      $prefix = isset($element['#field_prefix']) ? $element['#field_prefix'] : '';
      $suffix = isset($element['#field_suffix']) ? $element['#field_suffix'] : '';

      if (!empty($prefix)) {
          $prefix = '<span class="field-prefix' . $prefix . '</span>';
      }

      if (!empty($suffix)) {
          $suffix = '<span class="field-suffix' . $suffix . '</span>';
      }

      $output .= $prefix . $element['#children'] . $suffix;
    }

@thlo7777 Your solution did not work for me, It created duplicate form fields if you use a placeholder.

this worked for me
I modified form-element.func.php

    // Build the form element.
    $build['element'] = array(
      '#markup' => $element['#children'],
      '#prefix' => !empty($prefix) ? $prefix : NULL,
      '#suffix' => !empty($suffix) ? $suffix : NULL,
      '#weight' => 1,
    );
  }

else{
    if(!empty($element['#field_suffix'])) {
      $build['element']['#suffix'] = $element['#field_suffix'];
    }
    if(!empty($element['#field_prefix'])) {
      $build['element']['#prefix'] = $element['#field_prefix'];
    }
  }

same problem for me and the modification from @vlooivlerke in form-element.func.php solve the problem.
thanks a lot.

Like gge, the output is inverted:

<div>
  <label>Test</label>
  <label><input></label>
</div>

instead of

<div>
  <label><input>Test</label>
</div>

If you read the comment in bootstrap_form_element :

  // Checkboxes and radios render the input element inside the label. If the
  // element is neither of those, then the input element must be rendered here.

important think is "render the input element inside the label". So #field_prefix and/or #field_suffix must be added to label key, not element key:

    // Build the form element.
    $build['element'] = array(
      '#markup' => $element['#children'],
      '#prefix' => !empty($prefix) ? $prefix : NULL,
      '#suffix' => !empty($suffix) ? $suffix : NULL,
      '#weight' => 1,
    );
  }
  else{
    if(!empty($element['#field_suffix'])) {
      $build['label']['#suffix'] = $element['#field_suffix'];
    }
    if(!empty($element['#field_prefix'])) {
      $build['label']['#prefix'] = $element['#field_prefix'];
    }
  }

In order to have a correct display. For entityreference_view_widget, #field_suffix is not included in label directly, but at least the position is correct (after the checkbox).

Thank you so much. @titouille this worked for me. (Y)

Thank you @vlooivlerke and @titouille. Your solution save my time

another solution look here: https://www.drupal.org/node/2524296#comment-12050849