1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Algebra question renderer class.
*
* @package qtype
* @subpackage algebra
* @author Roger Moore <rwmoore 'at' ualberta.ca>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* Generates the output for algebra questions.
*
* @copyright 2009 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_algebra_renderer extends qtype_renderer {
public function formulation_and_controls(question_attempt $qa,
question_display_options $options) {
global $CFG;
$question = $qa->get_question();
$currentanswer = $qa->get_last_qt_var('answer');
$inputname = $qa->get_qt_field_name('answer');
$nameprefix = str_replace(':', '_', $inputname); // Valid javascript name.
$inputattributes = array(
'type' => 'text',
'name' => $inputname,
'value' => $currentanswer,
'id' => $inputname,
'size' => 80,
);
if ($options->readonly) {
$inputattributes['readonly'] = 'readonly';
}
$feedbackimg = '';
if ($options->correctness) {
$answer = $question->get_matching_answer(array('answer' => $currentanswer));
if ($answer) {
$fraction = $answer->fraction;
} else {
$fraction = 0;
}
$inputattributes['class'] = $this->feedback_class($fraction);
$feedbackimg = $this->feedback_image($fraction);
}
$iframename = $nameprefix.'_if';
// Name of the javascript function which causes the entered formula to be rendered.
$dfname = $nameprefix.'_display';
// Create an array of variable names to use when displaying the function entered.
$varnames = array();
if ($question and isset($question->variables)) {
$variables = $question->variables;
foreach ($question->variables as $var) {
$varnames[] = $var->name;
}
}
$varnames = implode(',', $varnames);
// Javascript function which the button uses to display the rendering
// This function sents the source of the iframe to the 'displayformula.php' script giving
// it an argument of the formula entered by the student.
$displayfunction = 'function '.$dfname."() {\n".
' var text="vars='.$varnames.'&expr="+escape(document.getElementsByName("'.$inputname.'")[0].value);'."\n".
" if(text.length != 0) {\n".
' document.getElementsByName("'.$iframename.'")[0].src="'.
$CFG->wwwroot.'/question/type/algebra/displayformula.php?"+'.
'text.replace(/\+/g,"%2b")'."\n".
" }\n".
" }\n";
$questiontext = $question->format_questiontext($qa);
$input = html_writer::empty_tag('input', $inputattributes) . $feedbackimg;
$result = html_writer::tag('div', $questiontext, array('class' => 'qtext'));
$result .= html_writer::tag('script', $displayfunction, array('type' => 'text/javascript'));
$result .= html_writer::start_tag('div', array('class' => 'ablock'));
$result .= html_writer::start_tag('div', array('class' => 'prompt', 'style' => 'vertical-align: top'));
if (isset($question->answerprefix) and !empty($question->answerprefix)) {
$opts = new StdClass;
$opts->para = false;
$result .= html_writer::tag('div', format_text($question->answerprefix, FORMAT_MOODLE, $opts) . $input,
array('class' => 'answer'));
} else {
$result .= get_string('answer', 'qtype_algebra',
html_writer::tag('div', $input, array('class' => 'answer')));
}
$result .= html_writer::end_tag('div');
$result .= html_writer::end_tag('div');
if ($qa->get_state() == question_state::$invalid) {
$result .= html_writer::nonempty_tag('div',
$question->get_validation_error(array('answer' => $currentanswer)),
array('class' => 'validationerror'));
}
$result .= html_writer::start_tag('div', array('class' => 'dispresponse'));
$result .= html_writer::empty_tag('input', array('type' => 'button',
'value' => get_string('displayresponse', 'qtype_algebra'), 'onclick' => $dfname.'()'));
$result .= html_writer::start_tag('iframe',
array('name' => $iframename, 'width' => '60%', 'height' => 60, 'align' => 'middle', 'src' => ''));
$result .= html_writer::end_tag('iframe');
$result .= html_writer::tag('script', $dfname.'();', array('type' => 'text/javascript'));
$result .= html_writer::end_tag('div');
return $result;
}
public function specific_feedback(question_attempt $qa) {
$question = $qa->get_question();
$answer = $question->get_matching_answer(array('answer' => $qa->get_last_qt_var('answer')));
if (!$answer || !$answer->feedback) {
return '';
}
return $question->format_text($answer->feedback, $answer->feedbackformat,
$qa, 'question', 'answerfeedback', $answer->id);
}
public function correct_response(question_attempt $qa) {
$question = $qa->get_question();
$answer = $question->get_matching_answer($question->get_correct_response());
if (!$answer) {
return '';
}
$formatoptions = new stdClass;
$formatoptions->para = false;
$formatoptions->clean = false;
$formattedanswer = format_text($question->formated_expression($answer->answer), FORMAT_MOODLE, $formatoptions);
return get_string('correctansweris', 'qtype_algebra', s($answer->answer)). $formattedanswer;
}
}
|
