我在这里阅读了这个答案Guide for writing arrowkey navigation on focusable elements?,但它不够详细,不适合像我这样的新手理解。
我需要像这样的东西,我的DOM中有一个带有div的4x4网格。我希望能够在选择器中移动,然后能够使用enter选择聚焦div。
编辑:粘贴了一些代码,
当我意识到自己处于完全错误的轨道时,这就是我的尝试:
function arrowKeys(input){
var keyCode = input.keyCode;
var border = document.getElementById(keyid);
var removeBorder = border.removeAttribute("style");
if(keyCode == 38 || keyCode == 39 || keyCode == 40 || keyCode == 37){
var addborder = border.setAttribute("style", "border:2px solid red");
border.addborder;
if(keyCode == 38){
removeBorder;
keyid = keyid - 4;
border.addborder;
console.log(keyid + " upp");
}
if (keyCode == 39){
removeBorder;
keyid++;
border.addborder;
console.log(keyid + " right");
}
if(keyCode == 40){ // right arrowkey
removeBorder;
keyid = keyid + 4;
border.addborder;
console.log(keyid + " down");
}
if (keyCode == 37){ // left arrowkey
removeBorder;
keyid--;
border.addborder;
console.log(keyid + " left");
}
}
}
我认为你需要在这样的行上使用数组,
var navigationMap = [[1,2,3,4][5,6,7,8][9,10,11,12][13,14,15,16]];
但是我坚持这样的事情......
答案 0 :(得分:0)
我用jQuery完成了这个。您可以使用以下内容连接到事件:
$(".some-css-class-on-your-divs").keydown(function (e)
{
HandleKeyDown(e, $(this));
})
然后用另一个javascript方法处理事件
function HandleKeyDown(event, jqNode)
{
event = event || window.event;
var charCode = event.charCode || event.keyCode;
if (charCode == 40)
{ // down arrow key
/// do your thing here
}
// charcode 38 is up, and so on
}
答案 1 :(得分:0)
这是使用普通javascript执行此操作的方法。代码的第一部分是一些跨浏览器函数,用于添加事件处理程序和添加/删除类。你会注意到我添加/删除一个类来显示活动项而不是直接添加/删除一个样式。这将样式放在CSS而不是javascript中,这通常是一个好主意。
工作演示:http://jsfiddle.net/jfriend00/yMMxX/
(function() {
// refined add event cross browser
function addEvent(elem, event, fn) {
if (typeof elem === "string") {
elem = document.getElementById(elem);
}
// avoid memory overhead of new anonymous functions for every event handler that's installed
// by using local functions
function listenHandler(e) {
var ret = fn.apply(this, arguments);
if (ret === false) {
e.stopPropagation();
e.preventDefault();
}
return(ret);
}
function attachHandler() {
// set the this pointer same as addEventListener when fn is called
// and make sure the event is passed to the fn also so that works the same too
var ret = fn.call(elem, window.event);
if (ret === false) {
window.event.returnValue = false;
window.event.cancelBubble = true;
}
return(ret);
}
if (elem.addEventListener) {
elem.addEventListener(event, listenHandler, false);
} else {
elem.attachEvent("on" + event, attachHandler);
}
}
function addClass(elem, cls) {
var oldCls = elem.className;
if (oldCls) {
oldCls += " ";
}
elem.className = oldCls + cls;
}
function removeClass(elem, cls) {
var str = " " + elem.className + " ";
elem.className = str.replace(" " + cls + " ", " ").replace(/^\s+|\s+$/g, "");
}
function findItem(items, target) {
for (var i = 0; i < items.length; i++) {
if (items[i] === target) {
return(i);
}
}
return(-1);
}
var keys = {up: 38, down: 40, left: 37, right: 39};
var cards = document.getElementById("game-board").getElementsByClassName("card");
addEvent(document, "keydown", function(e) {
// get key press in cross browser way
var code = e.which || e.keyCode;
// number of items across
var width = 4;
var increment, index, newIndex, active;
switch(code) {
case keys.up:
increment = -width;
break;
case keys.down:
increment = width;
break;
case keys.left:
increment = -1;
break;
case keys.right:
increment = 1;
break;
default:
increment = 0;
break;
}
if (increment !== 0) {
active = document.getElementById("game-board").getElementsByClassName("active")[0];
index = findItem(cards, active);
newIndex = index + increment;
if (newIndex >= 0 && newIndex < cards.length) {
removeClass(active, "active");
addClass(cards[newIndex], "active");
}
// prevent default handling of up, down, left, right keys
return false;
}
});
})();