<script language="JavaScript">
<!--
// 用途：enter 转化成tab
//使用：onload ="initEnter2Tab()" form标记加上 <form name="frm" type="enter2tab">...</form>
var isCycle = false; //当光标到最后一个元素的时候，是否循环光标焦点，
var iCurrent = -1;
var frmName = "0"//input_form
//
function enterToTab() //网页里按回车时焦点的转移
{
var e = document.activeElement;
if(e == null) return false;
//获得当前表单的名字
for(i=0;i<document.forms.length;i++){
for(var el in document.forms[i].elements){
if(e.UniqueID == el.UniqueID){
frmName = document.forms[i].name
}
}
}
if(window.event.keyCode == 13)
{
switch(e.tagName)//标签类型
{
case "INPUT":
handleInput(e)
break;
case "SELECT":
handleSelect(e)
break;
case "TEXTAREA":
handleTextarea(e)
break;
default:
//window.status = "未知的标签名称:"+e.tagName+"，不能移动焦点！"
}
}// end if
}
//处理input 标签类型
function handleInput(e)
{
switch(e.type)
{
case "text":
case "password":
case "checkbox":
case "radio":
case "file":
moveFocusToNextElement(e)
break;
case "submit"://处理有提交按钮的情况
case "button":
if(isHandleSubmit(e)){
handleSubmit(e)
focusOnNextElement(document.forms[frmName].elements,iCurrent-1)
break;
}
moveFocusToNextElement(e)
break;
default:
}
}
//处理select 标签类型
function handleSelect(e)
{
moveFocusToNextElement(e)
}
//处理textarea 标签类型
function handleTextarea(e)
{
moveFocusToNextElement(e)
}
//移动到下一个元素
function moveFocusToNextElement(e)
{
var oE = document.forms[frmName].elements, iCurentPos=-1;
for(var i=0; i<oE.length; i++)
{
if(oE[i] == e) iCurentPos = i;
if(iCurentPos>-1 && iCurentPos+1<oE.length)
{
//把焦点设置到下一个可用的元素上
focusOnNextElement(oE,iCurentPos)
}
}
}
//下一个可用元素得到焦点 n 元素的位置
function focusOnNextElement(oElements,iIndex)
{
var oE = oElements
var oldIndex = iIndex
while(oE[iIndex+1].type =="hidden" || oE[iIndex+1].disabled || oE[iIndex+1].readOnly == true || oE[iIndex+1].style.display == "none")
{
/*
window.status += "e.name = "+oE[iIndex+1].name
window.status += ";e.type = "+oE[iIndex+1].type
window.status += ";e.disabled = "+oE[iIndex+1].disabled
window.status += ";e.readOnly = "+oE[iIndex+1].readOnly+"."
*/
iIndex++;
if(iIndex+1 == oE.length)
{
if(isCycle){//设置焦点在第一元素
focusOnNextElement(oE,-1)
}
return;
}
}//end while
iCurrent = iIndex+1
oE[iCurrent].focus();
window.event.keyCode = 0;
window.event.returnValue= false;
return;
}
//处理当前元素
function handleSubmit(element)
{
element.click()
return;
}
//判断是否处理提交
function isHandleSubmit(element)
{
var ret = false;
if(element !=null && (element.id.toUpperCase() == "SUBMIT" || element.name.toUpperCase() == "SUBMIT" || element.isSubmit)){
ret = true;
}
return ret;
}
//初始化 initEnter2Tab()
function initEnter2Tab()
{
for(i=0;i<document.forms.length;i++){
if(document.forms[i].type !=null && document.forms[i].type == "enter2tab"){
document.forms[i].onkeydown = function f(){enterToTab();};
}
}
//文档初始化焦点
if(document.forms[0].elements != null)
focusOnNextElement(document.forms[0].elements,-1)
}
//-->
</script>
<body onload="initEnter2Tab()">
<form method=post action="" type="enter2tab" name="aa">
<input type="text" name=""><input type="text" name=""><input type="submit">
</form>
