JavaScript实现tab键切换选项卡
重要的方法
| 方法 | 作用 |
|---|
| onclick | 添加点击触发事件 |
| onfocus | 获取焦点触发事件 |
| tabIndex | 添加tab键索引 |
| onblur | 离开焦点触发事件 |
| blur | 失去焦点 |
| focus | 设置焦点 |
源代码
<!DOCTYPE html>
<html lang="zh">
<meta charset="utf8" />
<style>
/* 大正方形的类 */
.box {
width: 200px;
height: 200px;
position: absolute;
float: left;
line-height: 200px;
text-align: center;
font-size: 100px;
left: 0;
right: 0;
bottom: 0;
top: 0;
margin: auto;
}
/* 大正方形的类选择器 */
.box:nth-child(1) {
background-color: red;
}
.box:nth-child(2) {
display: none;
background-color: wheat;
}
.box:nth-child(3) {
display: none;
background-color: blue;
}
.box:nth-child(4) {
display: none;
background-color: yellow;
}
/* 小正方形的类 */
.but {
width: 50px;
height: 50px;
float: left;
line-height: 50px;
text-align: center;
font-size: 25px;
margin-top: 125px;
}
.but:nth-child(1) {
background-color: red;
}
.but:nth-child(2) {
background-color: wheat;
}
.but:nth-child(3) {
background-color: blue;
}
.but:nth-child(4) {
background-color: yellow;
}
.but:hover {
background-color: black;
color: white;
}
/* 最外层的，括起四个小正方形 */
._div1 {
width: 200px;
height: 50px;
position: absolute;
left: 0;
right: 0;
bottom: 0;
top: 0;
margin: auto;
}
</style>
<head>
<title>tab切换选项卡</title>
</head>
<body>
<div id="_div" class="_div"></div>
<div id="_div1" class="_div1"></div>
</body>
<script>
//当前索引号
var now_index = 0;
var create_div = [];
//给定时器加上线程锁
var next_tab = true;
//颜色
var color_list = ["red", "wheat", "blue", "yellow"];
//大正方形的div
var _div = document.getElementById("_div");
//小正方形的div
var _div1 = document.getElementById("_div1");
//批量生成大小正方形
for (var i = 0; i <= 3; i++) {
create_div[i] = document.createElement("div");
create_div[i + 4] = document.createElement("div");
create_div[i].className = "box";
create_div[i + 4].className = "but";
create_div[i].innerHTML = i + 1;
create_div[i + 4].innerHTML = i + 1;
//正方形获得焦点或者点击事件都会触发切换函数
create_div[i + 4].onclick = qiehuan;
create_div[i + 4].onfocus = qiehuan;
create_div[i + 4].onblur = qiehuan;
//为4个小正方形添加tab键索引
create_div[i + 4].tabIndex = i + 1;
//将生成的函数加入div
_div.appendChild(create_div[i]);
_div1.appendChild(create_div[i + 4]);
}
//取生成后的大小正方形
var __div = _div.getElementsByTagName("div");
var __div1 = _div1.getElementsByTagName("div");
//默认红色小正方形为选中状态
__div1[0].style.backgroundColor = "purple";
__div1[0].style.color = "white";
__div1[0].focus();
//切换函数代码
function qiehuan() {
//取索引
var index = this.innerHTML - 1;
//判断是否为定时器触发的切换
if (isNaN(index)) {
//当索引值为最大时候自动跳回开始
if (now_index == 3) {
now_index = -1;
}
//索引值为下一个
index = ++now_index;
//获取当前焦点
__div1[index].focus();
} else {
next_tab = false;
}
//全局变量索引为当前索引值
now_index = index;
for (var i = 0; i <= 3; i++) {
if (index == i) {
__div1[i].style.backgroundColor = "purple";
__div1[i].style.color = "white";
__div[i].style.display = "block";
continue;
}
__div[i].style.display = "none";
__div1[i].style.backgroundColor = color_list[i];
__div1[i].style.color = "black";
}
}
//定时器
setInterval(() => {
//当线程锁激活的时候跳过
if (next_tab) {
qiehuan();
}
//线程锁关闭
next_tab = true;
}, 3000);
</script>
</html>
评论 (0)