Proyectos de Subversion Moodle

{"version":3,"file":"showhidesettings.min.js","sources":["../src/showhidesettings.js"],"sourcesContent":["/**\n * Show/hide admin settings based on other settings selected\n *\n * @copyright 2018 Davo Smith, Synergy Learning\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery'], function($) {\n    var dependencies;\n\n    // -------------------------------------------------\n    // Support functions, used by dependency functions.\n    // -------------------------------------------------\n\n    /**\n     * Check to see if the given element is the hidden element that makes sure checkbox\n     * elements always submit a value.\n     * @param {jQuery} $el\n     * @returns {boolean}\n     */\n    function isCheckboxHiddenElement($el) {\n        return ($el.is('input[type=hidden]') && $el.siblings('input[type=checkbox][name=\"' + $el.attr('name') + '\"]').length);\n    }\n\n    /**\n     * Check to see if this is a radio button with the wrong value (i.e. a radio button from\n     * the group we are interested in, but not the specific one we wanted).\n     * @param {jQuery} $el\n     * @param {string} value\n     * @returns {boolean}\n     */\n    function isWrongRadioButton($el, value) {\n        return ($el.is('input[type=radio]') && $el.attr('value') !== value);\n    }\n\n    /**\n     * Is this element relevant when we're looking for checked / not checked status?\n     * @param {jQuery} $el\n     * @param {string} value\n     * @returns {boolean}\n     */\n    function isCheckedRelevant($el, value) {\n        return (!isCheckboxHiddenElement($el) && !isWrongRadioButton($el, value));\n    }\n\n    /**\n     * Is this an unchecked radio button? (If it is, we want to skip it, as\n     * we're only interested in the value of the radio button that is checked)\n     * @param {jQuery} $el\n     * @returns {boolean}\n     */\n    function isUncheckedRadioButton($el) {\n        return ($el.is('input[type=radio]') && !$el.prop('checked'));\n    }\n\n    /**\n     * Is this an unchecked checkbox?\n     * @param {jQuery} $el\n     * @returns {boolean}\n     */\n    function isUncheckedCheckbox($el) {\n        return ($el.is('input[type=checkbox]') && !$el.prop('checked'));\n    }\n\n    /**\n     * Is this a multi-select select element?\n     * @param {jQuery} $el\n     * @returns {boolean}\n     */\n    function isMultiSelect($el) {\n        return ($el.is('select') && $el.prop('multiple'));\n    }\n\n    /**\n     * Does the multi-select exactly match the list of values provided?\n     * @param {jQuery} $el\n     * @param {array} values\n     * @returns {boolean}\n     */\n    function multiSelectMatches($el, values) {\n        var selected = $el.val() || [];\n        if (!values.length) {\n            // No values - nothing to match against.\n            return false;\n        }\n        if (selected.length !== values.length) {\n            // Different number of expected and actual values - cannot possibly be a match.\n            return false;\n        }\n        for (var i in selected) {\n            if (selected.hasOwnProperty(i)) {\n                if (values.indexOf(selected[i]) === -1) {\n                    return false; // Found a non-matching value - give up immediately.\n                }\n            }\n        }\n        // Didn't find a non-matching value, so we have a match.\n        return true;\n    }\n\n    // -------------------------------\n    // Specific dependency functions.\n    // -------------------------------\n\n    var depFns = {\n        notchecked: function($dependon, value) {\n            var hide = false;\n            value = String(value);\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                if (isCheckedRelevant($el, value)) {\n                    hide = hide || !$el.prop('checked');\n                }\n            });\n            return hide;\n        },\n\n        checked: function($dependon, value) {\n            var hide = false;\n            value = String(value);\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                if (isCheckedRelevant($el, value)) {\n                    hide = hide || $el.prop('checked');\n                }\n            });\n            return hide;\n        },\n\n        noitemselected: function($dependon) {\n            var hide = false;\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                hide = hide || ($el.prop('selectedIndex') === -1);\n            });\n            return hide;\n        },\n\n        eq: function($dependon, value) {\n            var hide = false;\n            var hiddenVal = false;\n            value = String(value);\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                if (isUncheckedRadioButton($el)) {\n                    // For radio buttons, we're only interested in the one that is checked.\n                    return;\n                }\n                if (isCheckboxHiddenElement($el)) {\n                    // This is the hidden input that is part of the checkbox setting.\n                    // We will use this value, if the associated checkbox is unchecked.\n                    hiddenVal = ($el.val() === value);\n                    return;\n                }\n                if (isUncheckedCheckbox($el)) {\n                    // Checkbox is not checked - hide depends on the 'unchecked' value stored in\n                    // the associated hidden element, which we have already found, above.\n                    hide = hide || hiddenVal;\n                    return;\n                }\n                if (isMultiSelect($el)) {\n                    // Expect a list of values to match, separated by '|' - all of them must\n                    // match the values selected.\n                    var values = value.split('|');\n                    hide = multiSelectMatches($el, values);\n                    return;\n                }\n                // All other element types - just compare the value directly.\n                hide = hide || ($el.val() === value);\n            });\n            return hide;\n        },\n\n        'in': function($dependon, value) {\n            var hide = false;\n            var hiddenVal = false;\n            var values = value.split('|');\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                if (isUncheckedRadioButton($el)) {\n                    // For radio buttons, we're only interested in the one that is checked.\n                    return;\n                }\n                if (isCheckboxHiddenElement($el)) {\n                    // This is the hidden input that is part of the checkbox setting.\n                    // We will use this value, if the associated checkbox is unchecked.\n                    hiddenVal = (values.indexOf($el.val()) > -1);\n                    return;\n                }\n                if (isUncheckedCheckbox($el)) {\n                    // Checkbox is not checked - hide depends on the 'unchecked' value stored in\n                    // the associated hidden element, which we have already found, above.\n                    hide = hide || hiddenVal;\n                    return;\n                }\n                if (isMultiSelect($el)) {\n                    // For multiselect, we check to see if the list of values provided matches the list selected.\n                    hide = multiSelectMatches($el, values);\n                    return;\n                }\n                // All other element types - check to see if the value is in the list.\n                hide = hide || (values.indexOf($el.val()) > -1);\n            });\n            return hide;\n        },\n\n        defaultCondition: function($dependon, value) { // Not equal.\n            var hide = false;\n            var hiddenVal = false;\n            value = String(value);\n            $dependon.each(function(idx, el) {\n                var $el = $(el);\n                if (isUncheckedRadioButton($el)) {\n                    // For radio buttons, we're only interested in the one that is checked.\n                    return;\n                }\n                if (isCheckboxHiddenElement($el)) {\n                    // This is the hidden input that is part of the checkbox setting.\n                    // We will use this value, if the associated checkbox is unchecked.\n                    hiddenVal = ($el.val() !== value);\n                    return;\n                }\n                if (isUncheckedCheckbox($el)) {\n                    // Checkbox is not checked - hide depends on the 'unchecked' value stored in\n                    // the associated hidden element, which we have already found, above.\n                    hide = hide || hiddenVal;\n                    return;\n                }\n                if (isMultiSelect($el)) {\n                    // Expect a list of values to match, separated by '|' - all of them must\n                    // match the values selected to *not* hide the element.\n                    var values = value.split('|');\n                    hide = !multiSelectMatches($el, values);\n                    return;\n                }\n                // All other element types - just compare the value directly.\n                hide = hide || ($el.val() !== value);\n            });\n            return hide;\n        }\n    };\n\n    /**\n     * Find the element with the given name\n     * @param {String} name\n     * @returns {*|jQuery|HTMLElement}\n     */\n    function getElementsByName(name) {\n        // For the array elements, we use [name^=\"something[\"] to find the elements that their name begins with 'something['/\n        // This is to find both name = 'something[]' and name='something[index]'.\n        return $('[name=\"' + name + '\"],[name^=\"' + name + '[\"]');\n    }\n\n    /**\n     * Check to see whether a particular condition is met\n     * @param {*|jQuery|HTMLElement} $dependon\n     * @param {String} condition\n     * @param {mixed} value\n     * @returns {Boolean}\n     */\n    function checkDependency($dependon, condition, value) {\n        if (typeof depFns[condition] === \"function\") {\n            return depFns[condition]($dependon, value);\n        }\n        return depFns.defaultCondition($dependon, value);\n    }\n\n    /**\n     * Show / hide the elements that depend on some elements.\n     */\n    function updateDependencies() {\n        // Process all dependency conditions.\n        var toHide = {};\n        $.each(dependencies, function(dependonname) {\n            var dependon = getElementsByName(dependonname);\n            $.each(dependencies[dependonname], function(condition, values) {\n                $.each(values, function(value, elements) {\n                    var hide = checkDependency(dependon, condition, value);\n                    $.each(elements, function(idx, elToHide) {\n                        if (toHide.hasOwnProperty(elToHide)) {\n                            toHide[elToHide] = toHide[elToHide] || hide;\n                        } else {\n                            toHide[elToHide] = hide;\n                        }\n                    });\n                });\n            });\n        });\n\n        // Update the hidden status of all relevant elements.\n        $.each(toHide, function(elToHide, hide) {\n            getElementsByName(elToHide).each(function(idx, el) {\n                var $parent = $(el).closest('.form-item');\n                if ($parent.length) {\n                    if (hide) {\n                        $parent.hide();\n                    } else {\n                        $parent.show();\n                    }\n                }\n            });\n        });\n    }\n\n    /**\n     * Initialise the event handlers.\n     */\n    function initHandlers() {\n        $.each(dependencies, function(depname) {\n            var $el = getElementsByName(depname);\n            if ($el.length) {\n                $el.on('change', updateDependencies);\n            }\n        });\n        updateDependencies();\n    }\n\n    /**\n     * Hide the 'this setting may be hidden' messages.\n     */\n    function hideDependencyInfo() {\n        $('.form-dependenton').hide();\n    }\n\n    return {\n        init: function(opts) {\n            dependencies = opts.dependencies;\n            initHandlers();\n            hideDependencyInfo();\n        }\n    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