php – 如何在symfony表单中选择显示字体真棒图标
作者：互联网
我想在Symfony Form Builder的选择选项中显示所有字体真棒图标.
我添加选择字段：
$choices = $this->getFontAwesome();
$form->add( $key, ChoiceType::class, array('label' => 'Texte', 'choices' => $choices, 'attr' => array('class' => "fa" ) ) );
我的函数getFontAwesome();
public function getFontAwesome(){
$webroot = $this->get('kernel')->getRootDir() . '/../web';
$pattern = '/\.(fa-(?:\w+(?:-)?)+):before\s+{\s*content:\s*"\\\\(.+)";\s+}/';
$subject = file_get_contents( $webroot . '/assets/vendor/font-awesome/css/font-awesome.css');
preg_match_all($pattern, $subject, $matches, PREG_SET_ORDER);
foreach($matches as $match) {
$icons[$match[1]] = '&#x' . $match[2] . ';' ;
}
return $icons ;
}
但是在选择字段中,看不到图标：
字段显示代码而不是图标
我该怎么办？
我尝试htmlspecialschars和其他(htmlentities,..)但不工作.
解决方法:
如果您没有使用任何js插件,如Select2或Bootstrap-select,那么您有http://jsfiddle.net/NyL7d/这种可能性,但我们需要稍微努力才能达到它.
首先,要说使用< i class =“fa fa-heart”>< / i>因为标签不是一个选择,因为<选项> element不能包含任何子元素,只能包含文本. (see related issue)
为了可重用性,让我们构建一个名为“IconChoiceType”的表单类型作为“ChoiceType”的子类：
namespace AppBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\OptionsResolver\OptionsResolver;
class IconChoiceType extends AbstractType
{
/**
* Cache for multiple icon fields or sub-requests.
*
* @var array
*/
private $choices;
private $kernelRootDir;
public function __construct($kernelRootDir)
{
$this->kernelRootDir = $kernelRootDir;
}
public function buildView(FormView $view, FormInterface $form, array $options)
{
// Pass this flag is necessary to render the label as raw.
// See below the twig field template for more details.
$view->vars['raw_label'] = true;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'attr' => [
// It's the key of the solution and can be done in many ways.
// Now, the rendered <select> element will have a new font.
'style' => "font-family: 'FontAwesome';"
],
'choices' => $this->getFontAwesomeIconChoices(),
]);
}
public function getParent()
{
return ChoiceType::class;
}
protected function getFontAwesomeIconChoices()
{
if (null !== $this->choices) {
// don't to load again for optimal performance.
// useful for multi-icon fields and sub-requests.
return $this->choices;
}
// BTW we could configure the path to the "font-awesome.css".
$fontAwesome = file_get_contents($this->kernelRootDir.'/../web/assets/vendor/font-awesome/css/font-awesome.css');
// this regular expression only works with uncompressed version (not works with "font-awesome.min.css")
$pattern = '/\.(fa-(?:\w+(?:-)?)+):before\s+{\s*content:\s*"\\\\(.+)";\s+}/';
if (preg_match_all($pattern, $fontAwesome, $matches, PREG_SET_ORDER)) {
foreach ($matches as list(, $class, $code)) {
// this may vary depending on the version of Symfony,
// if the class name is displayed instead of the icon then swap the key/value
$this->choices['&#x'.$code.';'] = $class;
}
}
return $this->choices;
}
}
和他们各自的注册服务：
# app/config/service.yml
services:
app.form.icon_choice_type:
class: AppBundle\Form\Type\ChoiceIconType
# Symfony has already a container parameter to the kernel root directory.
arguments: ['%kernel.root_dir%']
tags:
- { name: form.type }
好吧,到目前为止,没有任何结果与你的不同.
<select id="form_icon" name="form[icon]" style="font-family: 'FontAwesome';">
<option value="fa-glass"></option>
<option value="fa-music"></option>
...
</select>
现在问题在哪里？ < select>字体系列已准备就绪,但是它们没有显示的图标,为什么？
默认情况下,在Symfony中,Twig环境会转义使用htmlspecialchars(more details)呈现的所有值,因此我们只需要为此表单类型覆盖此行为.为此,我们在app / Resources / views / form目录中创建了fields.html.twig模板,并将此代码复制到：
{# app/Resources/views/form/fields.html.twig #}
{#
here isn't need to create the expected `icon_choice_widget` like shown
the documentation, because this looks equal to `choice_widget` from
`ChoiceType`, only we need overwrite the block that renders the label.
#}
{%- block choice_widget_options -%}
{% for group_label, choice in options %}
{%- if choice is iterable -%}
<optgroup label="{{ choice_translation_domain is same as(false) ? group_label : group_label|trans({}, choice_translation_domain) }}">
{% set options = choice %}
{{- block('choice_widget_options') -}}
</optgroup>
{%- else -%}
{# this line has been overwritten, see {{- block('choice_option_label') -}} to end #}
<option value="{{ choice.value }}"{% if choice.attr %} {% set attr = choice.attr %}{{ block('attributes') }}{% endif %}{% if choice is selectedchoice(value) %} selected="selected"{% endif %}>{{- block('choice_option_label') -}}</option>
{%- endif -%}
{% endfor %}
{%- endblock choice_widget_options -%}
{%- block choice_option_label -%}
{# this block has been called from choice_widget_options block #}
{%- if raw_label|default(false) -%}
{# the label is rendered as raw when IconChoiceType is used #}
{{ choice_translation_domain is same as(false) ? choice.label|raw : choice.label|trans({}, choice_translation_domain)|raw }}
{%- else -%}
{{ choice_translation_domain is same as(false) ? choice.label : choice.label|trans({}, choice_translation_domain) }}
{%- endif -%}
{%- endblock -%}
请注意,{{choice.label | raw}} raw filter将存储的原始文本(防止被转义)显示为标签,在本例中为图标字体内容.
最后,你需要注册表格主题,如描述documentation：
# app/config/config.yml
{# ... #}
twig:
form_themes:
- 'form/fields.html.twig'
结论：
$form->add('icon', IconChoiceType::class);
标签：php,forms,font-awesome,symfony 来源： https://codeday.me/bug/20190627/1310028.html