chamilo-lms/main/exercice/fill_blanks.class.php

<?php
/* For licensing terms, see /license.txt */
/**
*	File containing the FillBlanks class.
*	@package chamilo.exercise
* 	@author Eric Marguin
* 	@author Julio Montoya Armas switchable fill in blank option added
* 	@version $Id: admin.php 10680 2007-01-11 21:26:23Z pcool $
*/
/**
 * Code
 */

/**
	CLASS FillBlanks
 *
 *	This class allows to instantiate an object of type MULTIPLE_ANSWER (MULTIPLE CHOICE, MULTIPLE ANSWER),
 *	extending the class question
 *
 *	@author Eric Marguin
 * 	@author Julio Montoya multiple fill in blank option added
 *	@package chamilo.exercise
 **/

class FillBlanks extends Question
{
	static $typePicture = 'fill_in_blanks.gif';
	static $explanationLangVar = 'FillBlanks';

	/**
	 * Constructor
	 */
	function FillBlanks()
	{
		parent::question();
		$this -> type = FILL_IN_BLANKS;
		$this -> isContent = $this-> getIsContent();
	}

	/**
	 * function which redifines Question::createAnswersForm
	 * @param the formvalidator instance
	 */
	function createAnswersForm ($form) {
		$defaults = array();

		if (!empty($this->id)) {
			$objAnswer = new answer($this->id);

			// the question is encoded like this
		    // [A] B [C] D [E] F::10,10,10@1
		    // number 1 before the "@" means that is a switchable fill in blank question
		    // [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
		    // means that is a normal fill blank question

			$pre_array = explode('::', $objAnswer->selectAnswer(1));

			//make sure we only take the last bit to find special marks
			$sz = count($pre_array);
			$is_set_switchable = explode('@', $pre_array[$sz-1]);
			if ($is_set_switchable[1]) {
				$defaults['multiple_answer']=1;
			} else {
				$defaults['multiple_answer']=0;
			}

			//take the complete string except after the last '::'
			$defaults['answer'] = '';
			for ($i=0;$i<($sz-1);$i++) {
				$defaults['answer'] .= $pre_array[$i];
			}
			$a_weightings = explode(',', $is_set_switchable[0]);
		} else {
			$defaults['answer'] = get_lang('DefaultTextInBlanks');
		}

		// javascript
		echo '<script>
			function FCKeditor_OnComplete( editorInstance ) {
				if (window.attachEvent) {
					editorInstance.EditorDocument.attachEvent("onkeyup", updateBlanks) ;
				} else {
					editorInstance.EditorDocument.addEventListener("keyup",updateBlanks,true);
				}
			}

            var firstTime = true;

            function updateBlanks() {
                if (firstTime) {
                    field = document.getElementById("answer");
                    var answer = field.value;
                } else {
                    var oEditor = FCKeditorAPI.GetInstance(\'answer\');
                    answer =  oEditor.GetXHTML( true ) ;
                }

                var blanks = answer.match(/\[[^\]]*\]/g);
                var fields = "<div class=\"control-group\"><label class=\"control-label\">'.get_lang('Weighting').'</label><div class=\"controls\"><table>";

                if (blanks!=null) {
                    for (i=0 ; i<blanks.length ; i++){
                        if (document.getElementById("weighting["+i+"]"))
                            value = document.getElementById("weighting["+i+"]").value;
                        else
                            value = "10";
                        fields += "<tr><td>"+blanks[i]+"</td><td><input style=\"margin-left: 0em;\" size=\"5\" value=\""+value+"\" type=\"text\" id=\"weighting["+i+"]\" name=\"weighting["+i+"]\" /></td></tr>";

                    }
                }
                document.getElementById("blanks_weighting").innerHTML = fields + "</table></div></div>";
                if (firstTime) {
                    firstTime = false;
			';
            if (count($a_weightings)>0) {
                foreach($a_weightings as $i=>$weighting) {
                    echo 'document.getElementById("weighting['.$i.']").value = "'.$weighting.'";';
                }
            }
            echo '}
            }
            window.onload = updateBlanks;
		</script>';

		// answer
		$form -> addElement ('label', null, '<br /><br />'.get_lang('TypeTextBelow').', '.get_lang('And').' '.get_lang('UseTagForBlank'));
		$form -> addElement ('html_editor', 'answer', '<img src="../img/fill_field.png">','id="answer" cols="122" rows="6" onkeyup="javascript: updateBlanks(this);"', array('ToolbarSet' => 'TestQuestionDescription', 'Width' => '100%', 'Height' => '350'));

		$form -> addRule ('answer',get_lang('GiveText'),'required');
		$form -> addRule ('answer',get_lang('DefineBlanks'),'regex','/\[.*\]/');

		//added multiple answers
		$form -> addElement ('checkbox','multiple_answer','', get_lang('FillInBlankSwitchable'));

		$form -> addElement('html','<div id="blanks_weighting"></div>');

		global $text, $class;
		// setting the save button here and not in the question class.php
		$form->addElement('style_submit_button','submitQuestion',$text, 'class="'.$class.'"');

		if (!empty($this -> id)) {
			$form -> setDefaults($defaults);
		} else {
			if ($this -> isContent == 1) {
				$form -> setDefaults($defaults);
			}
		}
	}


	/**
	 * abstract function which creates the form to create / edit the answers of the question
	 * @param the formvalidator instance
	 */
	function processAnswersCreation($form)
	{
		global $charset;

		$answer = $form -> getSubmitValue('answer');
		//Due the fckeditor transform the elements to their HTML value
		$answer = api_html_entity_decode($answer, ENT_QUOTES, $charset);

		//remove the :: eventually written by the user
		$answer = str_replace('::','',$answer);

		// get the blanks weightings
		$nb = preg_match_all('/\[[^\]]*\]/', $answer, $blanks);
		if(isset($_GET['editQuestion']))
		{
			$this -> weighting = 0;
		}

		if($nb>0)
		{
			$answer .= '::';
			for($i=0 ; $i<$nb ; ++$i)
			{
				$answer .= $form -> getSubmitValue('weighting['.$i.']').',';
				$this -> weighting += $form -> getSubmitValue('weighting['.$i.']');
			}
			$answer = api_substr($answer,0,-1);
		}
		$is_multiple = $form -> getSubmitValue('multiple_answer');
		$answer.='@'.$is_multiple;

		$this -> save();
        $objAnswer = new answer($this->id);
        $objAnswer->createAnswer($answer,0,'',0,'');
        $objAnswer->save();
	}

	function return_header($feedback_type = null, $counter = null, $score = null, $show_media = false) {
	    $header = parent::return_header($feedback_type, $counter, $score, $show_media);
	    $header .= '<table class="'.$this->question_table_class .'">
			<tr>
                <th>'.get_lang("Answer").'</th>
			</tr>';
        return $header;
	}
}