自动调整为最大长度:

<select style="width:expression((this.offsetWidth>100)?'auto':'100')">

<option >hellohellohellohellohellohellohellohellohellohello</option>

</select>

鼠标点时自动变成最大长度,离开或选中时恢复原长度

<select name=s2 style="width:50px" onFocus="this.style.width='auto'"onblur="this.style.width='50px'" onChange="this.style.width ='50px'">

<option>1111111111111111111111111111</option>

<option>2222222222222222222</option>

</select>

鼠标滑过时自动变成最大长度,离开或选中时恢复原长度

<select name=s2 style="width:50px" onmouseover="this.style.width='auto'" onblur="this.style.width='50px'" onChange="this.style.width='50px'">

<option>1111111111111111111111111111</option>

<option>2222222222222222222</option>

</select>

选择后在页面的其它位置显示选择的项目

<div id=dsp></div>

<select name="select" size="1" onchange="dsp.innerText=this.options[this.selectedIndex].text">

<option value="1">test</option>

<option value="2" selected>test2</option>

</select>

鼠标滑过时显示当前选择的项目的值

<div id=div1 style="overflow:auto;height:expression(5*15);width:expression(document.all.s1.offsetWidth+18);">

<select name=s1 size=1 style="width:120" onmousemove="showTitle(this);"onmouseout="hideTitle(this);">

<option>aaaaaaaaaaaaaaaaaaaaaa1 </option>

<option >bbbbbbbbbbbbbbbbbbbbbbbbb1 </option>

<option>cccccccccccccccccccccccc1 </option>

<option>ddddddddddddddddddddddd1 </option>

<option>eeeeeeeeeeeeeeeeeeeeeee1 </option>

<option>fffffffffffffffffffffffffff1 </option>

</select>

</div>

<script>

// 定义Popup

var oP=window.createPopup();

oP.document.body.style.background="beige";

//popup 是否已显示

var oPShow=0;

function showTitle(obj){

var h=event.offsetY;

var fontsize=(obj.style.fontSize==""?(obj.currentStyle.fontSize==""?"9":obj.currentStyle.fontSize):obj.style.fontSize);

fontsize=parseInt(fontsize)*1.6;

var l=parseInt(h/fontsize);

oP.document.body.innerText=obj.options[l].text;

len=obj.options[l].text.length*8;

oP.show(event.offsetX+20,event.offsetY+fontsize+5,len,fontsize,document.body);

oPShow=1;

}

function hideTitle(obj){

if(oPShow==1)oP.hide();

}

</script>

更多信息请查看IT技术专栏