按方向键后能在多个下拉选项中自由选择某个选项值，然后把选中的值写入光标所在的文本框位置。
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<title>通过方向键来选择项目_武鸣人</title>
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点下下面的文本框然后按方向键<br />
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<input type="text" id="www_wuming_ren" value="" autocomplete="off" onkeydown="if(event.keyCode==13)return false;">
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onKeyPress
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var upKeyCode = 38;
var downKeyCode = 40;
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switch (event.keyCode)
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case 37:
clearSelectedOptBgColor(this);
this.seletedIndex--;
if (this.seletedIndex < 0)
this.seletedIndex = this.options.length - 1;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 38:
clearSelectedOptBgColor(this);
this.seletedIndex= this.seletedIndex-4;
if (this.seletedIndex < 0)
this.seletedIndex = this.options.length - 1;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 39:
clearSelectedOptBgColor(this);
this.seletedIndex++;
if (this.seletedIndex >= this.options.length)
this.seletedIndex = 0;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 40:
clearSelectedOptBgColor(this);
this.seletedIndex= this.seletedIndex+4;
if (this.seletedIndex >= this.options.length)
this.seletedIndex = 0;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case enterKeyCode:
this.value = this.options[this.seletedIndex].innerHTML;
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break;
}
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