高仿select
最近也不知道在瞎忙些什么，七月份一篇日志没写。昨天公司项目要求模拟一个select。其实这玩意以前也写过。只是感觉没做好。所以又重写了一个。和系统默认的很相近吧。说明一下吧：
一：鼠标点击这个肯定不用说了
二：支持键盘上下键，回车键选择
三：用tab键获得焦点后。也支持键盘上下键选择，无须弹出下拉菜单。
其实也没啥，无非就是个select而已。由于这个是用在我们公司项目上的。所以如果你想拿去用，估计有些东西不需要。比如那个回调函数，或者参数。这个你自己改一下就可以了。可以将回调函数作为一个属性放到opts里。
调用方式：newsky_select('mySelect1',function(){},{oClass:'aa',width:250})，如果你不想写回调函数，可以省掉，不过得改下js,将init:function(obj,callback,opts)里面callback和opts换下位置就可以了。opts里只定了width和class两个属性，width是模拟后的select的宽度。class就是模拟后的select的类了。废话不多说了。上代码：
function sky_select() {
this.init.apply(this, arguments)
};
sky_select.prototype = {
init: function(obj, callback, opts) {
var _this = this,
o = this.getObj(obj),
temp = [];
opts = opts || {};
this.oOptions = o.options;
this.current = 0;
this.n = 0;
sky_oIndex = 100;
this.callback = callback;
this.stopEnter = true;
this.box = document.createElement('div');
this.oInput = document.createElement('input');
this.oItmes = document.createElement('ul');
var width = opts.width || o.offsetWidth this.box.style.width = width + 'px';
this.oInput.style.width = width - 7 + 'px';
this.box.className = opts.oClass || 'select_wrap';
this.oInput.setAttribute('type', 'text');
this.oInput.setAttribute('readonly', 'readonly');
this.oInput.className = 'likeSelect';
var index = o.options.selectedIndex;
this.oInput.value = this.oOptions[index || 0].value;
if (index) this.current = index;
for (var i = 0,
len = this.oOptions.length; i < len; i++) {
temp.push(this.oOptions[i].value)
};
this.oItmes.innerHTML = '<li>' + temp.join('</li><li>') + '</li>';
this.box.appendChild(this.oInput);
this.box.appendChild(this.oItmes);
o.parentNode.appendChild(this.box);
o.style.display = 'none';
this.item = this.oItmes.getElementsByTagName('li');
this.oItmes.style.display = 'none';
this.oInput.onclick = function() {
_this.show()
};
this.oInput.onfocus = function() {};
this.oInput.onblur = function() {
this.stopEnter = true;
};
this.toSelect(this.item);
this.hide();
},
getObj: function(el) {
return el = typeof el == 'string' ? document.getElementById(el) : el;
},
show: function() {
var style = this.oItmes.style.display || 'none';
this.oItmes.style.display = style == 'none' ? 'block': 'none';
if (style == 'none') this.keyEvent();
this.item[this.current].className = 'active';
this.n = this.current;
},
toSelect: function(obj) {
var _this = this;
for (var i = 0,
len = obj.length; i < len; i++) { (function(i) {
obj[i].onclick = function() {
_this.oInput.value = this.innerHTML;
_this.oOptions[i].selected = true;
_this.n = _this.current = i;
_this.oItmes.style.display = 'none';
_this.box.style.position = 'static';
if (_this.callback && typeof _this.callback == 'function') _this.callback();
};
obj[i].onmouseover = function() {
_this.item[_this.current].className = '';
this.className = 'active';
_this.n = i;
}
obj[i].onmouseout = function() {
this.className = '';
}
})(i);
};
},
keyEvent: function() {
var _this = this;
var style = this.oItmes.style.display || 'none';
if (style == 'none') return;
this.stopEnter = false;
this.box.parentNode.style.zIndex = sky_oIndex++;
this.oItmes.onmouseout = function() {
_this.item[_this.current].className = 'active';
};
document.onkeyup = function(e) {
e = e || window.event;
switch (e.keyCode) {
case 38:
_this.up();
break;
case 40:
_this.down();
break;
case 13:
_this.enter();
break;
default:
;
}
}
},
up: function() {
if (this.n == 0) return;
this.n--;
this.item[this.current].className = '';
this.current = this.n;
this.item[this.n].className = 'active';
this.oInput.value = this.item[this.n].innerHTML;
this.oOptions[this.n].selected = true;
},
down: function() {
if (this.n == this.item.length - 1) return;
this.n++;
this.item[this.current].className = '';
this.current = this.n;
this.item[this.n].className = 'active';
this.oInput.value = this.item[this.n].innerHTML;
this.oOptions[this.n].selected = true;
},
enter: function() {
if (this.stopEnter) return;
this.oInput.value = this.item[this.n].innerHTML;
this.oOptions[this.n].selected = true;
this.current = this.n;
this.oItmes.style.display = 'none';
if (this.callback && typeof this.callback == 'function') this.callback();
this.stopEnter = true;
},
hide: function() {
var _this = this;
this.addEvent(document, 'click',
function(e) {
e = e || window.event;
var targ = e.target || e.srcElement;
if (targ != _this.oItmes && targ != _this.oInput) _this.oItmes.style.display = 'none';
})
},
addEvent: function(elm, evType, fn, useCapture) {
if (elm.addEventListener) {
elm.addEventListener(evType, fn, useCapture);
return true;
} else if (elm.attachEvent) {
var r = elm.attachEvent('on' + evType, fn);
return r;
} else {
elm['on' + evType] = fn;
}
}
}
HTML：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
* {
margin:0;
padding:0;
font-family:Arial, Helvetica, sans-serif;
font-size:11px;
}
ul {
list-style:none;
}
.box {
margin:10px auto;
width:250px;
height:24px;
position:relative;
}
.aa {
position:absolute;
top:0;
left:0;
}
.likeSelect {
display:block;
height:22px;
line-height:22px;
background:url(images/icon_select_arrow.gif) no-repeat 100% 8px;
border:1px solid;
border-color:#aeaeae #e5e5e5 #e5e5e5;
padding-left:5px;
cursor:default;
}
div ul {
border:1px solid #e5e5e5;
padding:1px;
margin-top:-1px;
*margin-top:-2px;
background:#fff;
}
div ul li {
height:20px;
line-height:20px;
text-decoration:none;
color:#000;
display:block;
padding-left:5px;
cursor:default;
}
div ul li.active {
background:#B91F33;
color:#fff;
}
</style>
<script type="text/javascript" src="myselect.js"></script>
<script type="text/javascript">
window.onload = function(){
var myselect = document.getElementById('mySelect')
new sky_select('mySelect',function(){alert(myselect.options[myselect.options.selectedIndex].value)},{oClass:'aa',width:250})
new sky_select('mySelect1',function(){},{oClass:'aa',width:250})
}
</script>
</head>
<body>
<div class="box">
<select name="" id="mySelect">
<option value="default">default</option>
<option value="options1">options1</option>
<option value="options2">options2</option>
<option value="options3" selected="selected">options3</option>
<option value="options4">options4</option>
<option value="options5">options5</option>
</select>
</div>
<div class="box">
<select name="" id="mySelect1">
<option value="default">default</option>
<option value="options1">options1</option>
<option value="options2">options2</option>
<option value="options3">options3</option>
<option value="options4">options4</option>
<option value="options5">options5</option>
</select>
</div>
</body>
</html>
另：右边那个小三角自己做一个吧。
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