question/flags.js

   1 // This file is part of Moodle - http://moodle.org/
   2 //
   3 // Moodle is free software: you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License as published by
   5 // the Free Software Foundation, either version 3 of the License, or
   6 // (at your option) any later version.
   7 //
   8 // Moodle is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 /**
  17  * JavaScript library for dealing with the question flags.
  18  *
  19  * This script, and the YUI libraries that it needs, are inluded by
  20  * the $PAGE->requires->js calls in question_get_html_head_contributions in lib/questionlib.php.
  21  *
  22  * @package    moodlecore
  23  * @subpackage questionengine
  24  * @copyright  2010 The Open University
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 M.core_question_flags = {
  29     flagattributes: null,
  30     actionurl: null,
  31     flagtext: null,
  32     listeners: [],
  33
  34     init: function(Y, actionurl, flagattributes, flagtext) {
  35         M.core_question_flags.flagattributes = flagattributes;
  36         M.core_question_flags.actionurl = actionurl;
  37         M.core_question_flags.flagtext = flagtext;
  38
  39         Y.all('div.questionflag').each(function(flagdiv, i) {
  40             var checkbox = flagdiv.one('input[type=checkbox]');
  41             if (!checkbox) {
  42                 return;
  43             }
  44
  45             var input = Y.Node.create('<input type="hidden" class="questionflagvalue" />');
  46             input.set('id', checkbox.get('id'));
  47             input.set('name', checkbox.get('name'));
  48             input.set('value', checkbox.get('checked') ? 1 : 0);
  49
  50             // Create an image input to replace the img tag.
  51             var image = Y.Node.create('<input type="image" class="questionflagimage" />');
  52             var flagtext = Y.Node.create('<span class="questionflagtext">.</span>');
  53             M.core_question_flags.update_flag(input, image, flagtext);
  54
  55             checkbox.remove();
  56             flagdiv.one('label').remove();
  57             flagdiv.append(input);
  58             flagdiv.append(image);
  59             flagdiv.append(flagtext);
  60         });
  61
  62         Y.delegate('click', function(e) {
  63             var input = this.one('input.questionflagvalue');
  64             input.set('value', 1 - input.get('value'));
  65             M.core_question_flags.update_flag(input, this.one('input.questionflagimage'),
  66                     this.one('span.questionflagtext'));
  67             var postdata = this.one('input.questionflagpostdata').get('value') +
  68                     input.get('value');
  69
  70             e.halt();
  71             Y.io(M.core_question_flags.actionurl , {method: 'POST', 'data': postdata});
  72             M.core_question_flags.fire_listeners(postdata);
  73         }, document.body, 'div.questionflag');
  74     },
  75
  76     update_flag: function(input, image, flagtext) {
  77         var value = input.get('value');
  78         image.setAttrs(M.core_question_flags.flagattributes[value]);
  79         flagtext.replaceChild(flagtext.create(M.core_question_flags.flagtext[value]),
  80                 flagtext.get('firstChild'));
  81         flagtext.set('title', M.core_question_flags.flagattributes[value].title);
  82     },
  83
  84     add_listener: function(listener) {
  85         M.core_question_flags.listeners.push(listener);
  86     },
  87
  88     fire_listeners: function(postdata) {
  89         for (var i = 0; i < M.core_question_flags.listeners.length; i++) {
  90             M.core_question_flags.listeners[i](
  91                 postdata.match(/\bqubaid=(\d+)\b/)[1],
  92                 postdata.match(/\bslot=(\d+)\b/)[1],
  93                 postdata.match(/\bnewstate=(\d+)\b/)[1]
  94             );
  95         }
  96     }
  97 };