From 58f3865fce36572cbedb3ee6d9aacd24ac7efceb Mon Sep 17 00:00:00 2001
From: Frederic Massart <fred@moodle.com>
Date: Mon, 6 May 2013 14:35:04 +0800
Subject: [PATCH] MDL-39280 form: Multiple select support disabledIf with
 multiple values

---
 lib/form/form.js | 51 +++++++++++++++++++++++++++++++++++++++++++++++-
 lib/formslib.php | 11 ++++++++++-
 2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/lib/form/form.js b/lib/form/form.js
index e9f9490cf34..69d803fb771 100644
--- a/lib/form/form.js
+++ b/lib/form/form.js
@@ -232,6 +232,7 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
             _dependency_eq : function(elements, value) {
                 var lock = false;
                 var hidden_val = false;
+                var options, v, selected, values;
                 elements.each(function(){
                     if (this.getAttribute('type').toLowerCase()=='radio' && !Y.Node.getDOMNode(this).checked) {
                         return;
@@ -243,14 +244,38 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
                         lock = lock || hidden_val;
                         return;
                     }
-                    //check for filepicker status
                     if (this.getAttribute('class').toLowerCase() == 'filepickerhidden') {
+                        // Check for filepicker status.
                         var elementname = this.getAttribute('name');
                         if (elementname && M.form_filepicker.instances[elementname].fileadded) {
                             lock = false;
                         } else {
                             lock = true;
                         }
+                    } else if (this.get('nodeName').toUpperCase() === 'SELECT' && this.get('multiple') === true) {
+                        // Multiple selects can have one or more value assigned. A pipe (|) is used as a value separator
+                        // when multiple values have to be selected at the same time.
+                        values = value.split('|');
+                        selected = [];
+                        options = this.get('options');
+                        options.each(function() {
+                            if (this.get('selected')) {
+                                selected[selected.length] = this.get('value');
+                            }
+                        });
+                        if (selected.length > 0 && selected.length === values.length) {
+                            for (var i in selected) {
+                                v = selected[i];
+                                if (values.indexOf(v) > -1) {
+                                    lock = true;
+                                } else {
+                                    lock = false;
+                                    return;
+                                }
+                            }
+                        } else {
+                            lock = false;
+                        }
                     } else {
                         lock = lock || this.get('value') == value;
                     }
@@ -288,6 +313,30 @@ M.form.initFormDependencies = function(Y, formid, dependencies) {
                         } else {
                             lock = false;
                         }
+                    } else if (this.get('nodeName').toUpperCase() === 'SELECT' && this.get('multiple') === true) {
+                        // Multiple selects can have one or more value assigned. A pipe (|) is used as a value separator
+                        // when multiple values have to be selected at the same time.
+                        values = value.split('|');
+                        selected = [];
+                        options = this.get('options');
+                        options.each(function() {
+                            if (this.get('selected')) {
+                                selected[selected.length] = this.get('value');
+                            }
+                        });
+                        if (selected.length > 0 && selected.length === values.length) {
+                            for (var i in selected) {
+                                v = selected[i];
+                                if (values.indexOf(v) > -1) {
+                                    lock = false;
+                                } else {
+                                    lock = true;
+                                    return;
+                                }
+                            }
+                        } else {
+                            lock = true;
+                        }
                     } else {
                         lock = lock || this.get('value') != value;
                     }
diff --git a/lib/formslib.php b/lib/formslib.php
index 201da0c097c..9499b5c7461 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -2233,12 +2233,21 @@ function validate_' . $this->_formName . '(frm) {
      * is checked. If $condition is something else (like "eq" for equals) then it is checked to see if the value
      * of the $dependentOn element is $condition (such as equal) to $value.
      *
+     * When working with multiple selects, the dependentOn has to be the real name of the select, meaning that
+     * it will most likely end up with '[]'. Also, the value should be an array of required values, or a string
+     * containing the values separated by pipes: array('red', 'blue') or 'red|blue'.
+     *
      * @param string $elementName the name of the element which will be disabled
      * @param string $dependentOn the name of the element whose state will be checked for condition
      * @param string $condition the condition to check
      * @param mixed $value used in conjunction with condition.
      */
-    function disabledIf($elementName, $dependentOn, $condition = 'notchecked', $value='1'){
+    function disabledIf($elementName, $dependentOn, $condition = 'notchecked', $value='1') {
+        // Multiple selects allow for a multiple selection, we transform the array to string here as
+        // an array cannot be used as a key in an associative array.
+        if (is_array($value)) {
+            $value = implode('|', $value);
+        }
         if (!array_key_exists($dependentOn, $this->_dependencies)) {
             $this->_dependencies[$dependentOn] = array();
         }