form improvements

resources/views/form/checkbox.blade.php

@@ -0,0 +1,22 @@
+@php
+/** @var \App\View\Widget $w */
+@endphp
+
+<div class="row form-group">
+  <div class="col-md-{{$w->fieldCols}} offset-md-{{$w->labelCols}}">
+    <div class="custom-control custom-checkbox{{ $errors->has($w->name) ? ' is-invalid' : '' }}">
+      <input type="checkbox" class="custom-control-input"
+             id="field-{{ $w->name }}"
+             {{+$w->value?'checked':''}}
+             name="{{ $w->name }}">
+      <label class="custom-control-label" for="field-{{ $w->name }}">{{ $w->label }}</label>
+    </div>
+
+    @if ($errors->has($w->name))
+      <span class="invalid-feedback" role="alert">
+        <strong>{{ $errors->first($w->name) }}</strong>
+      </span>
+    @endif
+  </div>
+  @include('form._help')
+</div>