1<script language="JavaScript">
2<!--
3
4// 用途：enter 转化成tab
5//使用：onload ="initEnter2Tab()" form标记加上 <form name="frm" type="enter2tab">...</form>
6
7var isCycle = false; //当光标到最后一个元素的时候，是否循环光标焦点，
8var iCurrent = -1;
9var frmName = "0"//input_form
10//
11function enterToTab() //网页里按回车时焦点的转移
12{
13var e = document.activeElement;
14if(e == null) return false;
15//获得当前表单的名字
16for(i=0;i<document.forms.length;i++){
17for(var el in document.forms[i].elements){
18if(e.UniqueID == el.UniqueID){
19frmName = document.forms[i].name
20}
21}
22}
23if(window.event.keyCode == 13)
24{
25switch(e.tagName)//标签类型
26{
27case "INPUT":
28handleInput(e)
29break;
30case "SELECT":
31handleSelect(e)
32break;
33case "TEXTAREA":
34handleTextarea(e)
35break;
36default:
37//window.status = "未知的标签名称:"+e.tagName+"，不能移动焦点！"
38}
39}// end if
40}
41//处理input 标签类型
42function handleInput(e)
43{
44switch(e.type)
45{
46case "text":
47case "password":
48case "checkbox":
49case "radio":
50case "file":
51moveFocusToNextElement(e)
52break;
53case "submit"://处理有提交按钮的情况
54case "button":
55if(isHandleSubmit(e)){
56handleSubmit(e)
57focusOnNextElement(document.forms[frmName].elements,iCurrent-1)
58break;
59}
60moveFocusToNextElement(e)
61break;
62default:
63}
64}
65//处理select 标签类型
66function handleSelect(e)
67{
68moveFocusToNextElement(e)
69}
70//处理textarea 标签类型
71function handleTextarea(e)
72{
73moveFocusToNextElement(e)
74}
75//移动到下一个元素
76function moveFocusToNextElement(e)
77{
78var oE = document.forms[frmName].elements, iCurentPos=-1;
79for(var i=0; i<oE.length; i++)
80{
81if(oE[i] == e) iCurentPos = i;
82if(iCurentPos>-1 && iCurentPos+1<oE.length)
83{
84//把焦点设置到下一个可用的元素上
85focusOnNextElement(oE,iCurentPos)
86}
87}
88}
89//下一个可用元素得到焦点 n 元素的位置
90function focusOnNextElement(oElements,iIndex)
91{
92var oE = oElements
93var oldIndex = iIndex
94while(oE[iIndex+1].type =="hidden" || oE[iIndex+1].disabled || oE[iIndex+1].readOnly == true || oE[iIndex+1].style.display == "none")
95{
96/*
97window.status += "e.name = "+oE[iIndex+1].name
98window.status += ";e.type = "+oE[iIndex+1].type
99window.status += ";e.disabled = "+oE[iIndex+1].disabled
100window.status += ";e.readOnly = "+oE[iIndex+1].readOnly+"."
101*/
102iIndex++;
103if(iIndex+1 == oE.length)
104{
105if(isCycle){//设置焦点在第一元素
106focusOnNextElement(oE,-1)
107}
108return;
109}
110}//end while
111iCurrent = iIndex+1
112oE[iCurrent].focus();
113window.event.keyCode = 0;
114window.event.returnValue= false;
115return;
116}
117//处理当前元素
118function handleSubmit(element)
119{
120element.click()
121return;
122}
123//判断是否处理提交
124function isHandleSubmit(element)
125{
126var ret = false;
127if(element !=null && (element.id.toUpperCase() == "SUBMIT" || element.name.toUpperCase() == "SUBMIT" || element.isSubmit)){
128ret = true;
129}
130return ret;
131}
132//初始化 initEnter2Tab()
133function initEnter2Tab()
134{
135for(i=0;i<document.forms.length;i++){
136if(document.forms[i].type !=null && document.forms[i].type == "enter2tab"){
137document.forms[i].onkeydown = function f(){enterToTab();};
138}
139}
140//文档初始化焦点
141if(document.forms[0].elements != null)
142focusOnNextElement(document.forms[0].elements,-1)
143}
144
145//-->
146
147</script>
1<body onload="initEnter2Tab()">
2<form action="" method="post" name="aa" type="enter2tab">
3<input name="" type="text"/><input name="" type="text"/><input type="submit"/>
4</form></body>