为 Html 的 Select 加一个提示语和输入方法

类别:Asp 点击:0 评论:0 推荐:

<Html>
<Head>
<SCRIPT LANGUAGE="JavaScript">
<!--
//定义 select 原值
var oldValue,oldText;
//select下拉框的onkeydown事件,修改下拉框的值
function catch_keydown(sel)
{
 switch(event.keyCode)
 {
  case 13: //回车键
   event.returnValue = false;
   break;
  case 27: //Esc键
   sel.options[sel.selectedIndex].text = oldText;
   sel.options[sel.selectedIndex].value = oldValue;
   event.returnValue = false;
   break;
  case 8:  //空格健
   var s = sel.options[sel.selectedIndex].text;
   s = s.substr(0,s.length-1);
   if (sel.options[sel.selectedIndex].value==sel.options[sel.selectedIndex].text)
   {
    sel.options[sel.selectedIndex].value=s;
    sel.options[sel.selectedIndex].text=s;
   }
   event.returnValue = false;
   break;
 }
 if (!event.returnValue && sel.onchange)
  sel.onchange(sel)
}

//select下拉框的onkeypress事件,修改下拉框的值
function catch_press(sel){
if(sel.selectedIndex>=0){
 var s = sel.options[sel.selectedIndex].text + String.fromCharCode(event.keyCode);
 if (sel.options[sel.selectedIndex].value==sel.options[sel.selectedIndex].text)
 {
  sel.options[sel.selectedIndex].value=s;
  sel.options[sel.selectedIndex].text=s;
 }
 event.returnValue = false;
 if (!event.returnValue && sel.onchange)
  sel.onchange(sel)
 }
}

//select下拉框的onfocus事件,保存下拉框原来的值
function catch_focus(sel) {
 oldText = sel.options[sel.selectedIndex].value;
 oldValue = sel.options[sel.selectedIndex].value;
}

//恢复select下拉列表当前选中的值
function LoadSelect(obj,value)
{
 for (var i=0; i< obj.options.length; i++)
  if (obj.options[i].value == value)
  {
   obj.selectedIndex = i;
   break;
  }
}

//select 选择框鼠标上移时提示选择的内容
function selMouseOver(obj)
{
 with (document.all.div_hint)
 {
  innerText = obj.options[obj.selectedIndex].text;
  if (innerText.length > 0)
  {
   innerText = " " + innerText + "  ";
   style.display = "block";
   style.left = event.clientX + 16;
   style.top = event.clientY;
  }
 }
}

//select 选择框鼠标移开时消失
function selMouseOut(obj)
{
 with (document.all.div_hint)
 {
  style.display = "none"
 }
}
//-->
</SCRIPT>
</Head>
<Body>
<!--调用-->
<select style='width:130px;z-index:-1' name='tmpSel' onmouseover=selMouseOver(this) onmouseout=selMouseOut(this) onkeydown=catch_keydown(this) onkeypress=catch_press(this) onfocus=catch_focus(this)>
 <option value=''></option>
</select>

<!--提示块-->
<div id=div_hint style="font-size:12px;color:red;display:none;position:absolute; z-index:2; top:200;background-color: #F7F7F7; layer-background-color: #0099FF; border: 1px #9c9c9c solid;filter:Alpha(style=0,opacity=80,finishOpacity=100);"></div>
</Body>
</Html>

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