259 lines
6.1 KiB
JavaScript
259 lines
6.1 KiB
JavaScript
(function($){
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//plugin's default options
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var settings = {
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combine: true, //combine multiple menus into a single select
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groupPageText: 'Main', //optgroup's aren't selectable, make an option for it
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nested: true, //create optgroups by default
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prependTo: 'body', //insert at top of page by default
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switchWidth: 640, //width at which to switch to select, and back again
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topOptionText: 'Select a page' //default "unselected" state
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},
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//used to store original matched menus
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$menus,
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//used as a unique index for each menu if no ID exists
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menuCount = 0,
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//used to store unique list items for combining lists
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uniqueLinks = [];
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//go to page
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function goTo(url){
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document.location.href = url;
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}
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//does menu exist?
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function menuExists(){
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return ($('.mnav').length) ? true : false;
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}
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//validate selector's matched list(s)
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function isList($this){
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var pass = true;
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$this.each(function(){
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if(!$(this).is('ul') && !$(this).is('ol')){
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pass=false;
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}
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});
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return pass;
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}//isList()
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//function to decide if mobile or not
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function isMobile(){
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return ($(window).width() < settings.switchWidth);
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}
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//function to get text value of element, but not it's children
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function getText($item){
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return $.trim($item.clone().children('ul, ol').remove().end().text());
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}
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//function to check if URL is unique
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function isUrlUnique(url){
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return ($.inArray(url, uniqueLinks) === -1) ? true : false;
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}
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//function to do duplicate checking for combined list
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function checkForDuplicates($menu){
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$menu.find(' > li').each(function(){
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var $li = $(this),
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link = $li.find('a').attr('href'),
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parentLink = function(){
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if($li.parent().parent().is('li')){
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return $li.parent().parent().find('a').attr('href');
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} else {
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return null;
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}
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};
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//check nested <li>s before checking current one
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if($li.find(' ul, ol').length){
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checkForDuplicates($li.find('> ul, > ol'));
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}
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//remove empty UL's if any are left by LI removals
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if(!$li.find(' > ul li, > ol li').length){
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$li.find('ul, ol').remove();
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}
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//if parent <li> has a link, and it's not unique, append current <li> to the "unique parent" detected earlier
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if(!isUrlUnique(parentLink(), uniqueLinks) && isUrlUnique(link, uniqueLinks)){
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$li.appendTo(
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$menu.closest('ul#mmnav').find('li:has(a[href='+parentLink()+']):first ul')
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);
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}
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//otherwise, check if the current <li> is unique, if it is, add it to the unique list
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else if(isUrlUnique(link)){
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uniqueLinks.push(link);
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}
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//if it isn't, remove it. Simples.
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else{
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$li.remove();
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}
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});
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}
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//function to combine lists into one
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function combineLists(){
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//create a new list
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var $menu = $('<ul id="mmnav" />');
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//loop through each menu and extract the list's child items
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//then append them to the new list
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$menus.each(function(){
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$(this).children().clone().appendTo($menu);
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});
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//de-duplicate any repeated items
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checkForDuplicates($menu);
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//return new combined list
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return $menu;
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}//combineLists()
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//function to create options in the select menu
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function createOption($item, $container, text){
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//if no text param is passed, use list item's text, otherwise use settings.groupPageText
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if(!text){
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$('<option value="'+$item.find('a:first').attr('href')+'">'+$.trim(getText($item))+'</option>').appendTo($container);
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} else {
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$('<option value="'+$item.find('a:first').attr('href')+'">'+text+'</option>').appendTo($container);
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}
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}//createOption()
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//function to create option groups
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function createOptionGroup($group, $container){
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//create <optgroup> for sub-nav items
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var $optgroup = $('<optgroup label="'+$.trim(getText($group))+'" />');
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//append top option to it (current list item's text)
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createOption($group,$optgroup, settings.groupPageText);
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//loop through each sub-nav list
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$group.children('ul, ol').each(function(){
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//loop through each list item and create an <option> for it
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$(this).children('li').each(function(){
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createOption($(this), $optgroup);
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});
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});
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//append to select element
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$optgroup.appendTo($container);
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}//createOptionGroup()
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//function to create <select> menu
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function createSelect($menu){
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//create <select> to insert into the page
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var $select = $('<select id="mm'+menuCount+'" class="mnav" />');
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menuCount++;
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//create default option if the text is set (set to null for no option)
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if(settings.topOptionText){
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createOption($('<li>'+settings.topOptionText+'</li>'), $select);
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}
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//loop through first list items
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$menu.children('li').each(function(){
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var $li = $(this);
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//if nested select is wanted, and has sub-nav, add optgroup element with child options
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if($li.children('ul, ol').length && settings.nested){
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createOptionGroup($li, $select);
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}
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//otherwise it's a single level select menu, so build option
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else {
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createOption($li, $select);
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}
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});
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//add change event and prepend menu to set element
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$select
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.change(function(){goTo($(this).val());})
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.prependTo(settings.prependTo);
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}//createSelect()
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//function to run plugin functionality
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function runPlugin(){
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//menu doesn't exist
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if(isMobile() && !menuExists()){
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//if user wants to combine menus, create a single <select>
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if(settings.combine){
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var $menu = combineLists();
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createSelect($menu);
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}
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//otherwise, create a select for each matched list
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else{
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$menus.each(function(){
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createSelect($(this));
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});
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}
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}
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//menu exists, and browser is mobile width
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if(isMobile() && menuExists()){
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$('.mnav').show();
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$menus.hide();
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}
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//otherwise, hide the mobile menu
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if(!isMobile() && menuExists()){
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$('.mnav').hide();
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$menus.show();
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}
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}//runPlugin()
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//plugin definition
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$.fn.mobileMenu = function(options){
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//override the default settings if user provides some
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if(options){$.extend(settings, options);}
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//check if user has run the plugin against list element(s)
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if(isList($(this))){
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$menus = $(this);
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runPlugin();
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$(window).resize(function(){runPlugin();});
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} else {
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alert('mobileMenu only works with <ul>/<ol>');
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}
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};//mobileMenu()
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})(jQuery);
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