Jonathan Hodgson
7 years ago
commit
b0bf4612f0
5 changed files with 234 additions and 7 deletions
@ -0,0 +1,218 @@ |
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(function(){ |
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var previousWidth = window.innerWidth; |
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var menuState = "unset"; |
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var nav; |
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|
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/** |
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* keyboardInteract |
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* |
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* controlls the keyboard interaction on the menu. |
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* |
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* @param a <element>: The anchor element that has focus |
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* @param interaction <string>: The type of interaction left/right/up/down/tab etc. |
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* @param e <event>: The event (so we can prevent default etc) |
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* @param loc <string>: The location of the anchor that has focus top/inner |
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**/ |
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function keyboardInteract(a,interaction,e, loc){ |
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if (loc == "top"){ //If focus is on one of the top row
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switch (interaction){ |
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case "up": //I don't think this should ever be needed but close the submenu
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closeChildMenu(a.parentElement); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "down": //Open the sub menu
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openChildMenu(a.parentElement); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "left": //Move to the left (or last if at first)
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var previousLi = a.parentElement.previousElementSibling; |
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if(previousLi == null){ |
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var children = a.parentElement.parentElement.children; |
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previousLi = children[children.length - 1]; |
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} |
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previousLi.querySelector("a").focus(); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "right": //Move to the right or first if on last
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var nextLi = a.parentElement.nextElementSibling; |
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if(nextLi == null){ |
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nextLi = a.parentElement.parentElement.querySelector("li"); //This is the first li
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} |
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nextLi.querySelector("a").focus(); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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} |
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} else if (loc == "second"){ |
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switch (interaction){ |
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case "esc": |
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case "up": |
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var containerLi = a.parentElement.parentElement.parentElement; |
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if(containerLi.tagName.toUpperCase() == "ul"){ //This section is for the 2 row Health and Safety catagory
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containerLi = containerLi.parentElement; |
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} |
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closeChildMenu(containerLi); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "right": |
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var nextLi = a.parentElement.nextElementSibling; |
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if(nextLi == null){ //If on last li, go to first
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nextLi = a.parentElement.parentElement.children[0]; |
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} |
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while(nextLi.querySelector("a")==null){ |
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nextLi = nextLi.nextElementSibling; |
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if(nextLi == null){ //If on last li, go to first
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nextLi = nextLi.parentElement.children[0]; |
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} |
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} |
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nextLi.querySelector("a").focus(); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "left": |
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var nextLi = a.parentElement.previousElementSibling; |
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if(nextLi == null){ //If on last li, go to first
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nextLi = a.parentElement.parentElement.children[a.parentElement.parentElement.children.length -1]; |
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} |
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while(nextLi.querySelector("a")==null){ |
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nextLi = nextLi.previoudElementSibling; |
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if(nextLi == null){ //If on last li, go to first
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nextLi = nextLi.parentElement.children[nextLi.parentElement.children.length - 1]; |
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} |
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} |
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nextLi.querySelector("a").focus(); |
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "down": |
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//If it has third level anchors under it
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//Focus on child nav
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//Else if it has a second row of sub-cats
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//If there is one directly beneith current focus, focus on it
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//Else focus the last in the row below
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//Else dont do anything
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e.preventDefault(); |
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e.stopPropagation(); |
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break; |
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case "up": |
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//If on the second row, go to the first row
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//If the element above in the first row has sub-sub-cats, focus the last of them
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//Otherwise focus on the sub-cat directly benieth
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//If on the first row close the submenu
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} |
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} |
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} |
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/** |
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* setupKeyboardEventListeners |
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* |
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* Sets up the event listenrs for an array like object of elements (normally anchors or buttons) |
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* |
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* els <array|nodelist>: The list of elements |
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* position <string>: The position string to be passed to the new function |
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**/ |
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function setupKeyboardEventListeners(els, position){ |
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els.forEach(function(a,i,list){ |
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var self = a; |
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a.fpEvent=function(e){ |
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var keyCode = e.keyCode; |
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switch (keyCode) { |
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case 38: // Up arrow
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case 75: // K key
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keyboardInteract(self,"up",e,position); |
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break; |
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case 40: // Down arrow
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case 74: // J Key
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keyboardInteract(self,"down",e,position); |
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break; |
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case 37: // Left arrow
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case 72: // H Key
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keyboardInteract(self,"left",e,position); |
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break; |
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case 39: // Right arrow
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case 76: // L Key
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keyboardInteract(self,"right",e,position); |
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break; |
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case 9: // Tab Key
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keyboardInteract(self,"tab",e,position); |
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break; |
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case 27: // ESC Key
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keyboardInteract(self,"esc",e,position); |
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break; |
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} |
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} |
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a.addEventListener("keydown", a.fpEvent); |
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}); |
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} |
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function openChildMenu(li){ |
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li.classList.add("open"); //Display the menu
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console.log(li); |
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console.log(li.querySelector("ul").querySelector("a")); |
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li.querySelector("ul").querySelector("a").focus(); //Focus on the first anchor
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} |
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function closeChildMenu(li){ |
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li.classList.remove("open"); |
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li.querySelector("a").focus(); |
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} |
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function unsetMobile(){ |
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console.log("unsetMobile"); |
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} |
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function unsetDesktop(){ |
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console.log("unsetDesktop"); |
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} |
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function setupMobile(){ |
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console.log("setupMobile"); |
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} |
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function setupDesktop(){ |
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console.log("setupDesktop"); |
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var topLevel = nav.querySelectorAll("nav>ul>li>a"); |
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var secondLevel = nav.querySelectorAll("nav>ul .heading"); |
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var thirdLevel = nav.querySelectorAll("nav>ul ul ul a"); |
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setupKeyboardEventListeners(topLevel, "top"); |
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setupKeyboardEventListeners(secondLevel, "second"); |
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setupKeyboardEventListeners(thirdLevel, "third"); |
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} |
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function doMenu(){ |
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//If mobile
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if (window.matchMedia("(min-width: 800px)").matches){// If desktop width
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if(menuState == "mobile"){ // If currently mobile
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unsetMobile(); |
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setupDesktop(); |
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menuState = "desktop"; |
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} |
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if(menuState == "unset"){ // If currently unset
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setupDesktop(); |
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menuState = "desktop"; |
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} |
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} else { //If mobile width
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if(menuState == "desktop"){ // If currently desktop
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//Switch to mobile
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unsetDesktop(); |
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setupMobile(); |
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menuState = "mobile"; |
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} |
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if(menuState == "unset"){ // If currently unset
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setupMobile(); |
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menuState = "mobile"; |
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} |
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} |
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} |
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window.addEventListener("load",function(){ |
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nav = document.querySelector("#menu-wrapper"); |
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doMenu(); |
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}); |
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window.addEventListener("resize",function(e){ |
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//If width has changed
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if (previousWidth != window.innerWidth){ |
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previousWidth = window.innerWidth; |
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console.log("Changing width"); |
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doMenu(); |
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} |
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}); |
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})(); |
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@ -1 +1 @@ |
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Subproject commit c63b69062e860a126be7c1547131de1ee69acdef |
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Subproject commit 80042f404d193ed1919d845bee56faee78312190 |
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