299 lines
11 KiB
JavaScript
299 lines
11 KiB
JavaScript
(function($) {
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/**
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* Attaches the tree behavior to the term widget form.
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*/
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Drupal.behaviors.termReferenceTree = {
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attach: function(context, settings) {
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// Bind the term expand/contract button to slide toggle the list underneath.
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$('.term-reference-tree-button', context).once('term-reference-tree-button').click(function() {
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$(this).toggleClass('term-reference-tree-collapsed');
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$(this).siblings('ul').slideToggle('fast');
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});
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// An expand all button (unimplemented)
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/*
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$('.expandbutton').click(function() {
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$(this).siblings('.term-reference-tree-button').trigger('click');
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});
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*/
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$('.term-reference-tree', context).once('term-reference-tree').each(function() {
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// On page load, check whether the maximum number of choices is already selected.
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// If so, disable the other options.
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var tree = $(this);
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checkMaxChoices(tree, false);
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$(this).find('input[type=checkbox]').change(function() {
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checkMaxChoices(tree, $(this));
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});
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//On page load, check if the user wants a cascading selection.
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if($(this).hasClass('term-reference-tree-select-parents')) {
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$(this).find('.form-checkbox').parent().addClass('select-parents');
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}
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//On page load, check if the user wants a track list. If so, add the
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//currently selected items to it.
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if($(this).hasClass('term-reference-tree-track-list-shown')) {
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var track_list_container = $(this).find('.term-reference-tree-track-list');
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//Var to track whether using checkboxes or radio buttons.
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var input_type =
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( $(this).has('input[type=checkbox]').length > 0 ) ? 'checkbox' : 'radio';
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//Find all the checked controls.
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var checked_controls = $(this).find('input[type=' + input_type + ']:checked');
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//Get their labels.
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var labels = checked_controls.next();
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var label_element;
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//For each label of the checked boxes, add item to the track list.
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labels.each(function(index) {
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label_element = $(labels[index]);
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addItemToTrackList(
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track_list_container, //Where to add new item.
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label_element.html(), //Text of new item.
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$(label_element).attr('for'), //Id of control new item is for.
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input_type //checkbox or radio
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);
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}); //End labels.each
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//Show "nothing selected" message, if needed.
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showNothingSelectedMessage(track_list_container);
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//Event - when an element on the track list is clicked on:
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// 1. Delete it.
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// 2. Uncheck the associated checkbox.
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//The event is bound to the track list container, not each element.
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$(track_list_container).click(function(event){
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//Remove the "nothing selected" message if showing - add it later if needed.
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//removeNothingSelectedMessage(track_list_container);
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var event_target = $(event.target);
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var control_id = event_target.data('control_id');
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if(control_id) {
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event_target.remove();
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var checkbox = $('#' + control_id);
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checkbox.removeAttr('checked');
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checkMaxChoices(tree, checkbox);
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//Show "nothing selected" message, if needed.
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showNothingSelectedMessage(track_list_container);
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}
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});
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//Change track list when controls are clicked.
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$(this).find('.form-' + input_type).change(function(event){
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//Remove the "nothing selected" message if showing - add it later if needed.
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removeNothingSelectedMessage(track_list_container);
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var event_target = $(event.target);
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var control_id = event_target.attr('id');
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if ( event_target.attr('checked') ) {
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//Control checked - add item to the track list.
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label_element = event_target.next();
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addItemToTrackList(
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track_list_container, //Where to add new item.
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label_element.html(), //Text of new item.
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$(label_element).attr('for'), //Id of control new item is for.
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input_type //checkbox or radio
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);
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}
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else {
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//Checkbox unchecked. Remove from the track list.
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$('#' + control_id + '_list').remove();
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}
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//Show "nothing selected" message, if needed.
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showNothingSelectedMessage(track_list_container);
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}); //End process checkbox changes.
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} //End Want a track list.
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//On page load, check if the user wants a cascading selection.
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if($(this).hasClass('term-reference-tree-cascading-selection')) {
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var mode_select = $(this).hasClass('term-reference-tree-cascading-selection-mode-select');
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var mode_deselect = $(this).hasClass('term-reference-tree-cascading-selection-mode-deselect');
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//Check children when checkboxes are clicked.
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$(this).find('.form-checkbox').change(function(event) {
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var event_target = $(event.target);
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var event_target_checked = event_target.is(':checked');
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var control_id = event_target.attr('id');
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var children = event_target.parent().next().children().find('> :not(ul) > input[id^="' + control_id + '-children"]');
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if (!mode_select && !mode_deselect) {
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if(event_target_checked) {
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$(children).filter(':not(:checked)').click().trigger('change');
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}
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else {
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$(children).filter(':checked').click().trigger('change');
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}
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} else if (mode_select && event_target_checked) {
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$(children).filter(':not(:checked)').click().trigger('change');
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} else if (mode_deselect && !event_target_checked) {
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$(children).filter(':checked').click().trigger('change');
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}
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});
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//End process checkbox changes.
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} //End Want a cascading checking.
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});
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}
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};
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/**
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* Add a new item to the track list.
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* If more than one item can be selected, the new item is positioned to
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* match the order of the terms in the checkbox tree.
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*
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* @param track_list_container Container where the new item will be added.
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*
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* @param item_text Text of the item to add.
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*
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* @param control_id Id of the checkbox/radio control the item matches.
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*
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* @param control_type Control type - 'checkbox' or 'radio'.
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*/
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function addItemToTrackList(track_list_container, item_text, control_id, control_type) {
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var new_item = $('<li class="track-item">' + item_text + '</li>');
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new_item.data('control_id', control_id);
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//Add an id for easy finding of the item.
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new_item.attr('id', control_id + '_list');
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//Process radio controls - only one item can be selected.
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if ( control_type == 'radio') {
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//Find the existing element on the track list, if there is one.
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var current_items = track_list_container.find('li');
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//If there are no items on the track list, add the new item.
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if ( current_items.length == 0 ) {
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track_list_container.append(new_item);
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}
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else {
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//There is an item on the list.
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var current_item = $(current_items.get(0));
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//Is the item we want to add different from what is there?
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if ( current_item.data('control_id') != control_id ) {
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//Remove exiting element from track list, and add the new one.
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current_item.remove();
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track_list_container.append(new_item);
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}
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}
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return;
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}
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//Using checkboxes, so there can be more than one selected item.
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//Find the right place to put the new item, to match the order of the
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//checkboxes.
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var list_items = track_list_container.find('li');
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var item_comparing_to;
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//Flag to tell whether the item was inserted.
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var inserted_flag = false;
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list_items.each(function(index){
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item_comparing_to = $(list_items[index]);
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//If item is already on the track list, do nothing.
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if ( control_id == item_comparing_to.data('control_id') ) {
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inserted_flag = true;
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return false; //Returning false stops the loop.
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}
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else if ( control_id < item_comparing_to.data('control_id') ) {
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//Add it here.
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item_comparing_to.before(new_item);
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inserted_flag = true;
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return false; //Returning false stops the loop.
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}
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});
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//If not inserted yet, add new item at the end of the track list.
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if ( ! inserted_flag ) {
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track_list_container.append(new_item);
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}
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}
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/**
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* Show the 'nothing selected' message if it applies.
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*
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* @param track_list_container Where the message is to be shown.
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*/
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function showNothingSelectedMessage(track_list_container) {
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//Is the message there already?
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var message_showing =
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(track_list_container.find('.term_ref_tree_nothing_message').length != 0);
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//Number of real items showing.
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var num_real_items_showing =
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message_showing
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? track_list_container.find('li').length - 1
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: track_list_container.find('li').length;
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if ( num_real_items_showing == 0 ) {
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//No items showing, so show the message.
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if ( ! message_showing ) {
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track_list_container.append(
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'<li class="term_ref_tree_nothing_message">' + termReferenceTreeNothingSelectedText + '</li>'
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);
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}
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}
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else { // !(num_real_items_showing == 0)
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//There are real items.
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if ( message_showing ) {
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track_list_container.find('.term_ref_tree_nothing_message').remove();
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}
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}
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}
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/**
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* Remove the 'nothing selected' message. Makes processing easier.
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*
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* @param track_list_container Where the message is shown.
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*/
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function removeNothingSelectedMessage(track_list_container) {
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track_list_container.find('.term_ref_tree_nothing_message').remove();
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}
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// This helper function checks if the maximum number of choices is already selected.
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// If so, it disables all the other options. If not, it enables them.
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function checkMaxChoices(item, checkbox) {
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var maxChoices = -1;
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try {
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maxChoices = parseInt(Drupal.settings.term_reference_tree.trees[item.attr('id')]['max_choices']);
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}
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catch (e){}
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var count = item.find(':checked').length;
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if(maxChoices > 0 && count >= maxChoices) {
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item.find('input[type=checkbox]:not(:checked)').attr('disabled', 'disabled').parent().addClass('disabled');
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} else {
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item.find('input[type=checkbox]').removeAttr('disabled').parent().removeClass('disabled');
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}
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if(checkbox) {
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if(item.hasClass('term-reference-tree-select-parents')) {
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var track_list_container = item.find('.term-reference-tree-track-list');
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if(checkbox.prop('checked')) {
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checkbox.parents('ul.term-reference-tree-level li').children('div.form-item').find('input[type=checkbox]').each(function() {
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$(this).prop('checked', true);
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if(track_list_container) {
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var label_element = $(this).next();
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addItemToTrackList(
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track_list_container, //Where to add new item.
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label_element.html(), //Text of new item.
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$(label_element).attr('for'), //Id of control new item is for.
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(item.has('input[type=checkbox]').length > 0) ? 'checkbox' : 'radio'
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);
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}
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});
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}
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}
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}
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}
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})(jQuery);
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