Html的Select添一个输入的方法 _HTML/CSS

Html的Select加一个输入的方法

<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[0].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;
}   
//-->
</SCRIPT>
</Head>
<Body>
<!--调用-->
<select style='width:130px;z-index:-1' name='tmpSel'    onkeydown=catch_keydown(this) onkeypress=catch_press(this) onfocus=catch_focus(this)>
<option value=''></option>
<option value=''>A</option>
<option value=''>B</option>
<option value=''>C</option>
</select>
</Body>
</Html>

带有提示信息的

xieyj（原作）

<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;
}

//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>

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zwhfyy/archive/2009/05/21/4205515.aspx