add html field in form.

Author: z-song

src/Form.php

@@ -54,6 +54,7 @@
  * @method Field\Divide         divide()
  * @method Field\Password       password($column, $label = '')
  * @method Field\Decimal        decimal($column, $label = '')
+ * @method Field\Html           html($html)
  */
 class Form
 {
@@ -871,6 +872,7 @@ public static function registerBuiltinFields()
             'timeRange'         => \Encore\Admin\Form\Field\TimeRange::class,
             'url'               => \Encore\Admin\Form\Field\Url::class,
             'year'              => \Encore\Admin\Form\Field\Year::class,
+            'html'              => \Encore\Admin\Form\Field\Html::class,
         ];
 
         foreach ($map as $abstract => $class) {

src/Form/Field/Html.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Encore\Admin\Form\Field;
+
+use Encore\Admin\Form\Field;
+
+class Html extends Field
+{
+    /**
+     * Htmlable.
+     *
+     * @var string
+     */
+    protected $html = '';
+
+    /**
+     * Create a new Html instance.
+     *
+     * @param mixed $html
+     */
+    public function __construct($html)
+    {
+        $this->html = $html;
+    }
+
+    /**
+     * Render html field.
+     *
+     * @return string
+     */
+    public function render()
+    {
+        return <<<EOT
+<div class="form-group">
+    <label  class="col-sm-2 control-label"></label>
+    <div class="col-sm-6">
+        $this->html
+    </div>
+</div>
+EOT;
+
+    }
+}

tests/UserFormTest.php

@@ -34,7 +34,8 @@ public function testCreatePage()
             ->seeElement('span[class=help-block] i[class*=fa-image]')
             ->seeInElement('span[class=help-block]', '上传头像')
             ->seeElement("select[name='tags[]'][multiple=multiple]")
-            ->dontSeeElement('a[class*=item_delete]');
+            ->dontSeeElement('a[class*=item_delete]')
+            ->seeInElement('a[html-field]', 'html...');
     }
 
     public function testSubmitForm()

tests/controllers/UserController.php

@@ -146,6 +146,8 @@ protected function form()
 
             $form->display('created_at', 'Created At');
             $form->display('updated_at', 'Updated At');
+
+            $form->html('<a html-field>html...</a>');
         });
     }
 }