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<?php |
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declare(strict_types=1); |
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namespace SKien\Formgenerator; |
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/** |
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* Checkbox input field. |
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* |
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* @package Formgenerator |
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* @author Stefanius <[email protected]> |
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* @copyright MIT License - see the LICENSE file for details |
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*/ |
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class FormCheck extends FormInput |
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{ |
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/** |
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* Create a checkbox. |
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* As default, the value 'on' is submitted for a checked element. This value can be |
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* changed by setting a btnValue for the elementname in the FormData. <br/> |
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* <b>Note: HTML does not submit any value for unchecked checkboxes !!!.</b> |
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* @param string $strName name AND id of the element |
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* @param int $wFlags (default: 0) |
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* @param string $strSuffix Text after the checkbox (default: '') |
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*/ |
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public function __construct(string $strName, int $wFlags = 0, string $strSuffix = '') |
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{ |
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$this->oFlags = new FormFlags($wFlags); |
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$this->strName = $strName; |
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$this->strSuffix = $strSuffix; |
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if ($this->oFlags->isSet(FormFlags::READ_ONLY | FormFlags::DISABLED)) { |
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$this->addAttribute('disabled'); |
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} |
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} |
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/** |
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* Build the HTML-markup for the checkbox. |
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* Checkbox is a special case, as it behaves particularly with regard to the transferred |
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* value and does not support read-only mode. |
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* There is special treatment for both cases, which is explained in more detail in the |
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* respective code areas bolow. |
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* @return string |
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*/ |
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public function getHTML() : string |
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{ |
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$this->processFlags(); |
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$bChecked = $this->getBoolValue(); |
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if ($bChecked) { |
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$this->addAttribute('checked'); |
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} |
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$strHTML = $this->buildContainerDiv(); |
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$strHTML .= $this->buildUncheckedSurrogate(); |
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$strHTML .= $this->buildCheckBox(); |
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$strHTML .= $this->buildReadonlySurrogate($bChecked); |
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if (!empty($this->strSuffix)) { |
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$strHTML .= ' ' . $this->strSuffix; |
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} |
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$strHTML .= '</div>' . PHP_EOL; |
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return $strHTML; |
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} |
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/** |
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* Get the value as bool. <ul> |
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* <li> 'real' bool values as is </li> |
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* <li> numeric: 0 -> false, all other -> true </li> |
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* <li> string: '1', 'on', 'true', 'yes' (case insensitive) -> true, all other -> false </li></ul> |
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* @return bool |
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*/ |
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protected function getBoolValue() : bool |
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{ |
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$bChecked = false; |
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$value = $this->oFG->getData()->getValue($this->strName); |
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if (is_bool($value)) { |
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$bChecked = $value; |
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} else { |
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if (is_numeric($value)) { |
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$bChecked = ($value !== 0); |
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} else { |
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$value = strtolower($value); |
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$bChecked = in_array($value, ['1', 'on', 'true', 'yes']); |
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} |
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} |
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return $bChecked; |
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} |
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/** |
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* Build the checkbox. |
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* @return string |
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*/ |
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protected function buildCheckBox() : string |
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{ |
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$strHTML = '<input type="checkbox"'; |
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$strHTML .= $this->buildStyle(); |
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$strHTML .= $this->buildAttributes(); |
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$strHTML .= $this->buildTabindex(); |
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$strHTML .= ' id="' . $this->strName . '"'; |
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if (!$this->oFlags->isSet(FormFlags::READ_ONLY | FormFlags::DISABLED)) { |
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$strHTML .= ' name="' . $this->strName . '"'; |
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} |
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$strHTML .= '>'; |
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return $strHTML; |
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} |
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/** |
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* Build the surrogate for unchecked box. |
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* @return string |
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*/ |
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protected function buildUncheckedSurrogate() : string |
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{ |
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// We insert a hidden edit field with same name/id BEFORE we create the checkbox |
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// and alwas set its value to 'off'. |
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// If the checkbox is activated, 'on' (or the value set with BtnValue) is posted as normal. |
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// However, since the value of a non-activated checkbox is not transferred at all, in this |
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// case the hidden field defined in the previous order comes into play and the fixed value |
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// 'off' is transferred. |
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// This is particularly helpful/important if a database operation is to be carried out |
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// dynamically on the basis of the transferred fields: If the 'off' were not transferred, |
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// the field would not be taken into account either and would therefore never be set from |
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// 'on' to 'off'!! |
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$strHTML = '<input type="hidden" value="off" name="' . $this->strName . '">'; |
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return $strHTML; |
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} |
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/** |
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* Build the surrogate in case of readonly checkbox. |
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* @param bool $bChecked |
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* @return string |
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*/ |
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protected function buildReadonlySurrogate(bool $bChecked) : string |
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{ |
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// NOTE: because checkboxes don't support readonly-attribute and disabled checkboxes |
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// are not posted to reciever, we insert an hidden field with name and id to keep |
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// value 'alive' |
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// -> so we dont set name and id for readonly or disabled checkbox! |
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$strHTML = ''; |
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if ($this->oFlags->isSet(FormFlags::READ_ONLY | FormFlags::DISABLED)) { |
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$strHTML .= '<input'; |
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$strHTML .= ' type="hidden"'; |
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$strHTML .= ' name="' . $this->strName . '"'; |
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$strValue = ($bChecked) ? 'on' :'off'; |
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$strHTML .= ' value="' . $strValue . '">'; |
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} |
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return $strHTML; |
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} |
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} |
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Stefanius67 /
Formgenerator
