From 2c9b25fdfdfbc50f9c7ee959108e9149b0c46e1c Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@rc-d.net>
Date: Thu, 13 Sep 2018 10:07:29 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#686 where
 FieldtypeCheckbox::markupValue() result ended up blank after a PHP
 strip_tags()

---
 wire/modules/Fieldtype/FieldtypeCheckbox.module | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/wire/modules/Fieldtype/FieldtypeCheckbox.module b/wire/modules/Fieldtype/FieldtypeCheckbox.module
index 91144d86..b7bc2e54 100644
--- a/wire/modules/Fieldtype/FieldtypeCheckbox.module
+++ b/wire/modules/Fieldtype/FieldtypeCheckbox.module
@@ -35,10 +35,13 @@ class FieldtypeCheckbox extends Fieldtype {
 	public function ___markupValue(Page $page, Field $field, $value = null, $property = '') {
 		if(is_null($value)) $value = $page->get($field->name); 
 		$checked = $value ? " checked='checked'" : "";
-		return "<input type='checkbox'$checked disabled='disabled' />";
+		$textValue = $value ? '☒': '☐'; // utf-8 checkbox (the ☑ is also works for checked, but not quite as visible)
+		// note: the span below ensures a value survives even if markupValue has tags stripped from it
+		return "<input type='checkbox' $checked disabled='disabled' /><span style='display:none'>$textValue</span>";
 	}
 
 	public function getInputfield(Page $page, Field $field) {
+		/** @var InputfieldCheckbox $inputfield */
 		$inputfield = $this->modules->get('InputfieldCheckbox'); 
 		$inputfield->set('checkedValue', 1); 
 		$inputfield->set('uncheckedValue', 0);