Forms Zend Framework 2表单元素错误类+；用于渲染窗体的自定义ViewHelper

这是我本周的第三个问题（总的来说）-希望我不会在这里被禁止：D 不管怎样，我四处搜索，找不到解决我问题的确切解释

答：我已经四处搜索并找到了一个自定义ViewHelper来呈现我的表单。它所做的是递归地获取所有字段集，当它到达元素级别时，如下所示：

    public function renderElement($element) {
        $html = '
            <div class="row">' . 
            '<label class="col-md-12" for="' . $element->getAttribute('id') . '">' . $element->getLabel() . '</label>' . 
            $this->view->formElement($element) . 
            $this->view->FormElementErrors($element) .
            '<div class="clearfix" style="height: 15px;"></div>';

        return $html . PHP_EOL;
    }

public function renderElement($element) {
    // FORM ROW
    $html = '<div class="form-group">';

    // LABEL
    $html .= '<label class="form-label" for="' . $element->getAttribute('id') . '">' . $element->getLabel() . '</label>';

    // ELEMENT
    /*
     - Check if element has error messages
     - If it does, add my error-class to the element's existing one(s),
       to style the element differently on error
    */
    if (count($element->getMessages()) > 0) {
        $classAttribute = ($element->hasAttribute('class') ? $element->getAttribute('class') . ' ' : '');
        $classAttribute .= 'input-error';
        /* 
         * Normally, here I would have added a space in my string (' input-error')
         * Logically, I would figure that if the element already has a class "cls"
         * and I would do $element->getAttribute('class') . 'another-class'
         * then the class attribute would become "clsanother-class"
         * BUT it seems that, even if I don't intentionally add a space in my string,
         * I still get "cls another-class" as the resulted concatenated string
         * I assume that when building the form, ZF2 automatically
         * adds spaces after attributes values? so you/it won't have to
         * consider that later, when you'd eventually need to add another
         * value to an attribute?
         */
        $element->setAttribute('class', $classAttribute);
    }
    $html .= $this->view->formElement($element);
    /*
     * Of course, you could decide/need to do things differently,
     * depending on the element's type

       switch ($element->getAttribute('type')) {
           case 'text':
           case 'email': {

               break;
           }
           default: {

           }
       }
     */
    // ERROR MESSAGES
    // Custom class (.form-validation-error) for the default html wrapper - <ul>
    $html .= $this->view->FormElementErrors($element, array('class' => 'form-validation-error'));

    $html .= '</div>'; # /.form-group
    $html .= '<div class="clearfix" style="height: 15px;"></div>';

    return $html . PHP_EOL;
}

我注意到这会在我的元素上自动添加“input error”类（以防无效），这是完美的，但是我如何告诉formRow为显示错误消息的“ul”提供一个类呢

我会更进一步，问我如何才能扭转这种局面：

    echo $this->formLabel($this->form->get('user_fieldset')->get('user_name'));
    echo $this->formInput($this->form->get('user_fieldset')->get('user_name'));
    echo $this->formElementErrors($this->form->get('user_fieldset')->get('user_name'), array('class' => 'form-validation-error'));

---

将一个错误类广告到元素中，不仅是错误消息列表，而且如果有人回答A点，我认为这是同一个问题。

我已经设法这样做了：

    public function renderElement($element) {
        $html = '
            <div class="row">' . 
            '<label class="col-md-12" for="' . $element->getAttribute('id') . '">' . $element->getLabel() . '</label>' . 
            $this->view->formElement($element) . 
            $this->view->FormElementErrors($element) .
            '<div class="clearfix" style="height: 15px;"></div>';

        return $html . PHP_EOL;
    }

public function renderElement($element) {
    // FORM ROW
    $html = '<div class="form-group">';

    // LABEL
    $html .= '<label class="form-label" for="' . $element->getAttribute('id') . '">' . $element->getLabel() . '</label>';

    // ELEMENT
    /*
     - Check if element has error messages
     - If it does, add my error-class to the element's existing one(s),
       to style the element differently on error
    */
    if (count($element->getMessages()) > 0) {
        $classAttribute = ($element->hasAttribute('class') ? $element->getAttribute('class') . ' ' : '');
        $classAttribute .= 'input-error';
        /* 
         * Normally, here I would have added a space in my string (' input-error')
         * Logically, I would figure that if the element already has a class "cls"
         * and I would do $element->getAttribute('class') . 'another-class'
         * then the class attribute would become "clsanother-class"
         * BUT it seems that, even if I don't intentionally add a space in my string,
         * I still get "cls another-class" as the resulted concatenated string
         * I assume that when building the form, ZF2 automatically
         * adds spaces after attributes values? so you/it won't have to
         * consider that later, when you'd eventually need to add another
         * value to an attribute?
         */
        $element->setAttribute('class', $classAttribute);
    }
    $html .= $this->view->formElement($element);
    /*
     * Of course, you could decide/need to do things differently,
     * depending on the element's type

       switch ($element->getAttribute('type')) {
           case 'text':
           case 'email': {

               break;
           }
           default: {

           }
       }
     */
    // ERROR MESSAGES
    // Custom class (.form-validation-error) for the default html wrapper - <ul>
    $html .= $this->view->FormElementErrors($element, array('class' => 'form-validation-error'));

    $html .= '</div>'; # /.form-group
    $html .= '<div class="clearfix" style="height: 15px;"></div>';

    return $html . PHP_EOL;
}

开箱即用。这是我所期望的答案，那只是我错过/找不到的一种方法。但事实证明，ZF2在整个世界上没有任何你可能需要的现成的东西，你最终不得不写（或多或少）临时助手

无论如何，如果有人需要它，下面是整个RenderForm视图帮助器：

namespace User\View\Helper;

use Zend\View\Helper\AbstractHelper;

class RenderForm extends AbstractHelper {

    public function __invoke($form) {
        $form->prepare();
        $html = $this->view->form()->openTag($form) . PHP_EOL;
        $html .= $this->renderFieldsets($form->getFieldsets());
        $html .= $this->renderElements($form->getElements());
        $html .= $this->view->form()->closeTag($form) . PHP_EOL;
        return $html;
    }

    public function renderFieldsets($fieldsets) {

        foreach ($fieldsets as $fieldset) {
            if (count($fieldset->getFieldsets()) > 0) {
                $html = $this->renderFieldsets($fieldset->getFieldsets());
            } else {
                $html = '<fieldset>';
                    // You can use fieldset's name for the legend (if that's not inappropriate)
                    $html .= '<legend>' . ucfirst($fieldset->getName()) . '</legend>';
                    // or it's label (if you had set one)
                    // $html .= '<legend>' . ucfirst($fieldset->getLabel()) . '</legend>';
                    $html .= $this->renderElements($fieldset->getElements());
                $html .= '</fieldset>';
                // I actually never use the <fieldset> html tag.
                // Feel free to use anything you like, if you do have to
                // make grouping certain elements stand out to the user
            }
        }

        return $html;
    }

    public function renderElements($elements) {
        $html = '';
        foreach ($elements as $element) {
            $html .= $this->renderElement($element);
        }
        return $html;
    }

    public function renderElement($element) {
        // FORM ROW
        $html = '<div class="form-group">';

        // LABEL
        $html .= '<label class="form-label" for="' . $element->getAttribute('id') . '">' . $element->getLabel() . '</label>'; # add translation here

        // ELEMENT
        /*
         - Check if element has error messages
         - If it does, add my error-class to the element's existing one(s),
           to style the element differently on error
        */
        if (count($element->getMessages()) > 0) {
            $classAttribute = ($element->hasAttribute('class') ? $element->getAttribute('class') . ' ' : '');
            $classAttribute .= 'input-error';

            $element->setAttribute('class', $classAttribute);
        }
        $html .= $this->view->formElement($element);

        // ERROR MESSAGES
        $html .= $this->view->FormElementErrors($element, array('class' => 'form-validation-error'));


        $html .= '</div>'; # /.row
        $html .= '<div class="clearfix" style="height: 15px;"></div>';

        return $html . PHP_EOL;
    }

}

在Module.php中：

public function getViewHelperConfig() {
    return include __DIR__ . '/config/viewhelper.config.php';
}

然后，在您看来，只需调用：

$this->renderForm($form);

当然，如果您没有太多的视图帮助程序，就无法为此创建单独的配置文件，请不要使用Module.php，只需添加：

'view_helpers' => array(
    'invokables' => array(
        'renderForm' => 'User\View\Helper\RenderForm',
    ),
),

任何配置文件。

我使用getMessages（）方法检查元素是否有验证消息。例如

<div class="form-group <?=($this->form->get('user_fieldset')->get('user_name')->getMessages())?'has-error':'';?>">
    ...
</div>

---

对于您需要将class设置为
元素的内容，我需要将class设置为该ul，以便使用css对其进行样式设置。我不想从表单的类（.frm class ul）或表单id进行级联，我想直接通过ul的属性进行。
<div class="form-group <?=($this->form->get('user_fieldset')->get('user_name')->getMessages())?'has-error':'';?>">
    ...
</div>