CSS实现的Select下拉框

最新推荐文章于 2025-03-01 21:38:58 发布

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最新推荐文章于 2025-03-01 21:38:58 发布

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分类专栏： html+css+div

本文链接：https://blog.youkuaiyun.com/happy_jijiawei/article/details/41981571

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本文介绍如何利用CSS技术来美化传统的HTML Select元素，创建更符合现代网页设计风格的下拉选择框，提升用户体验。

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>CSS实现的Select下拉框</title>
<script>
scHTML='<div id="selectcontent" class="selectdiv" style="visibility:hidden;"><iframe id=selframe frameborder=0 height=100%></iframe><div id="selecthtml" class="selectcontent">selectÁÐ±í</div></div>'
document.write(scHTML)
vDiv=selectcontent
vDivHtml=selecthtml
function editselect(name,size,defaulttext,width,height,readonly){
var combo=this;
this.options=new Array();
this.name=name;
this.divname=name+'_div';
this.buttonname=name+'_button';
this.tablename=name+'_table';
this.htmltable=name+'_html'
if (!height) this.height=0; else this.height=height
if (width) this.width=width
if (!size) size=8
if (!defaulttext) defaulttext=""
if (!readonly || readonly==0) {readonly="" }else {if (readonly==1) readonly="readonly style=cursor:default";this.readonly=1}
esHTML='<div id='+this.divname+'>'
+'<table id='+this.tablename+' cellpadding=0 cellspacing=0 class=select><tr><td bgcolor=#FFFFFF>'
+'<input type=text class=selecttext size="'+size+'" name='+name+' value="'+defaulttext+'" '+readonly+'><td><button class=selectbutton id='+this.buttonname+'>6</td></tr></table>'
+'</div>'
document.write(esHTML)
this.sbutton=eval("document.all."+this.buttonname)
if (this.readonly==1) eval(this.name).οnclick=function(){combo.show()}
this.sbutton.οnclick=function(){combo.show()}
this.show=function(){
pDiv=eval(combo.divname)
pTable=eval(combo.tablename)
var vHTML='<table id=htmltable cellspacing="0" cellpadding="2" bgcolor="#ffffff" class="selecttable" width=100%>'
for (i=0;i<combo.options.length;i++)
{
vHTML+='<tr οnmοuseοver="mo(this)" οnmοuseοut="mu(this)" οnclick="document.all.'+combo.name+'.value=this.innerText;selectcontent.style.visibility=\'hidden\'"><td nowrap>'+combo.options[i]
}
vHTML+="</table>"
vDivHtml.innerHTML=vHTML
vtop=pDiv.offsetTop+pDiv.offsetHeight
vleft=pDiv.offsetLeft+1
vParent = pDiv.offsetParent;
while (vParent.tagName.toUpperCase() != "BODY")
{
vleft += vParent.offsetLeft;
vtop += vParent.offsetTop;
vParent = vParent.offsetParent;
}
var redge=document.body.clientWidth-vleft
var bedge=document.body.clientHeight-vtop
if (!combo.width) {vDiv.style.width=pTable.offsetWidth} else {vDiv.style.width=combo.width}
if (combo.height==0)
{
vDiv.style.pixelHeight=parseInt(htmltable.offsetHeight)+2
vDivHtml.style.pixelHeight=parseInt(htmltable.offsetHeight)+2
}
else
{
if (htmltable.offsetHeight>combo.height)
{
vDiv.style.pixelHeight=combo.height
vDivHtml.style.pixelHeight=combo.height
}
else
{
vDiv.style.pixelHeight=parseInt(htmltable.offsetHeight)+2
vDivHtml.style.pixelHeight=parseInt(htmltable.offsetHeight)+2
}

}
vDivHtml.scrollTop=0
if (redge<vDiv.offsetWidth)
vDiv.style.left=vleft-1-(vDiv.offsetWidth-redge)
else
vDiv.style.left=vleft-1
if (bedge<vDiv.offsetHeight)
//vDiv.style.top=vtop-vDiv.offsetHeight-pDiv.offsetHeight
vDiv.style.top=vtop-vDiv.offsetHeight+bedge
else
vDiv.style.top=vtop
vDivHtml.style.width=parseInt(vDiv.style.width)
vDiv.style.visibility="visible"
}
this.add=function(text){
combo.options[combo.options.length]=text
}

this.about=function(){
}
}
function mo(obj){
obj.style.backgroundColor="#000099"
obj.style.color="#ffffff"
}
function mu(obj){
obj.style.backgroundColor=""
obj.style.color="#000000"
}
document.οnmοusedοwn=function(){
if (vDiv.style.visibility=="visible"){
mx=event.x + document.body.scrollLeft
my=event.y + document.body.scrollTop;
x1=vDiv.offsetLeft
y1=vDiv.offsetTop
x2=vDiv.offsetLeft+vDiv.offsetWidth
y2=vDiv.offsetTop+vDiv.offsetHeight
if (mx<x1 || my<y1 || x2<mx || y2<my)
{
vDiv.style.visibility='hidden'
}
}
}
</script>
<style>
.selecttext{
border:0px
height: 16;
font-family:arial;
font-size:12px;
}
.selectbutton{
font-family: webdings;
font-size: 10px;
height: 19;
width: 16;
border: 1px solid #83A5EB;
line-height: 0px;
padding-bottom: 3px
}
.selecttable{
font-family:arial;
font-size:12px;
cursor:default;
}
.selectcontent
{
position: absolute;
top:0;
left:0;
overflow:auto;
border:1px solid #000000
}
.selectdiv
{
position: absolute;
width:100;
overflow:hidden;
}
.select{
border-collapse: collapse;
border: 1px solid
}
</style>
</head>
<body bgcolor="#83A5EB">
<table border="0" width="100%">
<tr>
<td width="151" align="center"><font size="2">可编辑的Select</font></td>
<td><script>
var sel1=new editselect("select1","25","可编辑的Select","");
sel1.add("这是一个可以编辑的Select")
sel1.add("Loveyou")
sel1.add("可以通过CSS，修改外形")
sel1.add("突破原来的Select诸多限制")
</script></td>
</tr>
<tr>
<td width="151" align="center"><font size="2">长度可以随意修改<br>可以设置为只读</font></td>
<td>
<script>
var sel2=new editselect("select2","20","长度可以随意修改",250,82,1);
sel2.add("这是一个可以编辑的Select")
sel2.add("支持CSS")
sel2.add("可以通过CSS，修改外形")
sel2.add("作者:舜子制作")
sel2.add("MSN:puterjam@msn.com")
</script>
</td>
</tr>
<tr>
<td width="151" align="center"><font size="2">可以遮盖系统Select</font></td>
<td>
<script>
var sel3=new editselect("select3","25","可以遮盖系统Select","",41);
sel3.add("这是一个可以编辑的Select")
sel3.add("这效果确实不错")
sel3.add("可以通过CSS，修改外形")
sel3.add("突破原来的Select诸多限制")
</script>
</td>
</tr>
<tr>
<td width="151" align="right">　</td>
<td><select><option>默认的Select</option></select>　</td>
</tr>
</table>
</body>

</html>

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