ENTER键可以让光标移到下一个输入框
<input onkeydown="if(event.keyCode==13)event.keyCode=9" >
只能是中文
<input onkeyup="value=value.replace(/[ -~]/g,'')" onkeydown="if(event.keyCode==13)event.keyCode=9">
只能是英文和数字.屏蔽了输入法
<input style="ime-mode:disabled" onkeydown="if(event.keyCode==13)event.keyCode=9">
只能输入英文和数字
<input onkeyup="value=value.replace(/[\W]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" onkeydown="if(event.keyCode==13)event.keyCode=9">
只能是数字
<input onkeyup="value=value.replace(/[^\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">
只能显示，不能修改的文本框
<input readOnly value="只能显示，不能修改">
只能是数字,判断按键 代码如下:
<script language=javascript>
function onlyNum()
{
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)||(event.keyCode==8)))
event.returnValue=false;
}
</script>
<input onkeydown="onlyNum();">
附：获取键盘的KeyCode
<html>
<head>
<script language="javascript">
ns4 = (document.layers) ? true : false;
ie4 = (document.all) ? true : false;
function keyDown(e){
if(ns4){
var nkey=e.which;
var iekey='现在是ns浏览器';
var realkey=String.fromCharCode(e.which);
}
if(ie4){
var iekey=event.keyCode;
var nkey='现在是ie浏览器';
var realkey=String.fromCharCode(event.keyCode);
if(event.keyCode==32){realkey='\' 空格\''}
if(event.keyCode==13){realkey='\' 回车\''}
if(event.keyCode==27){realkey='\' Esc\''}
if(event.keyCode==16){realkey='\' Shift\''}
if(event.keyCode==17){realkey='\' Ctrl\''}
if(event.keyCode==18){realkey='\' Alt\''}
}
alert('ns浏览器中键值:'+nkey+'\n'+'ie浏览器中键值:'+iekey+'\n'+'实际键为'+realkey);
}
document.onkeydown = keyDown;
if(ns4){
document.captureEvents(Event.KEYDOWN);}
</script>
</head>
<body>
//Javascript Document.
<hr>
<center>
<h3>请按任意一个键。。。。</h3>
</center>
</body>
</html>
限制网页用键盘
<body onkeydown="alert('禁用');return false;">
限制键盘的某个键：
<body onkeydown="if(event.keyCode==num){alert('禁用');return false;}>
再加个找按键的值
<script>
function show(){
alert("ASCII代码是："+event.keyCode);
}
</script>
<body onkeydown="show()">
只能是IP地址
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<style>
.a3
</style>
<script>
function mask(obj){
obj.value=obj.value.replace(/[^\d]/g,'')
key1=event.keyCode
if (key1==37 || key1==39)
{ obj.blur();
nextip=parseInt(obj.name.substr(2,1))
nextip=key1==37?nextip-1:nextip+1;
nextip=nextip>=5?1:nextip
nextip=nextip<=0?4:nextip
eval("ip"+nextip+".focus()")
}
if(obj.value.length>=3)
if(parseInt(obj.value)>=256 || parseInt(obj.value)<=0)
{
alert(parseInt(obj.value)+"IP地址错误！")
obj.value=""
obj.focus()
return false;
}
else
{ obj.blur();
nextip=parseInt(obj.name.substr(2,1))+1
nextip=nextip>=5?1:nextip
nextip=nextip<=0?4:nextip
eval("ip"+nextip+".focus()")
}
}
function mask_c(obj)
{
clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))
}
</script>
<title>IP地址输入</title>
</head>
<body>IP地址输入
<div style="border-width:1;border-color:balck;border-style:solid;width:165;font-size:9pt">
<input type=text name=ip1 maxlength=3 class=a3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip2 maxlength=3 class=a3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip3 maxlength=3 class=a3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip4 maxlength=3 class=a3 onkeyup="mask(this)" onbeforepaste=mask_c()>
</div>
</body>
</html>
用#default#savehistory防止后退清空text文本框：
<HTML>
<HEAD>
<META NAME="save" CONTENT="history">
<STYLE>
.saveHistory
</STYLE>
</HEAD>
<BODY>
<INPUT class=saveHistory type=text id=oPersistInput>
<input type=button onclick='javascript:location.href="http://www.webjx.com/"' value='点击进入,再按后退键试试？'>
</BODY>
</HTML>
TEXTAREA自适应文字行数的多少
<textarea rows=1 name=s1 cols=27 onpropertychange="this.style.posHeight=this.scrollHeight">
上传预览图片
<img id=pic src=http://www.webjx.com/images/logo.gif>
<input type=file name=file><input type=button onclick=pic.src=file.value value=预览图片>
<input type=button onclick=alert(file.value) value=图片地址>
<input type=button onclick="file.outerHTML=file.outerHTML.replace(/value=\w/g,'')" value="清除file里字">
去掉下拉选项的边框
<div style="position: absolute; left: 10px; top: 10px; width: 115px; height: 20px; clip:rect(2 114 20 2);">
<select>
<option >cnpeople</option>
<option >cnrose</option>
<option >cnbruce</option>
</select>
</font>
</div>
下拉列表打开窗口
<select onChange="if(this.selectedIndex && this.selectedIndex!=0)this.selectedIndex=0;">
<option selected>更多链接……</option>
<option value="http://www.cnbruce.com">cnbruce</option>
<option value="http://daonet.myrice.com/old/">daonet</option>
<option value="http://www.blueidea.com">blue!dea
</select>
TAB的显示
<script>
function editTab()
{
var code, sel, tmp, r
var tabs=""
event.returnValue = false
sel =event.srcElement.document.selection.createRange()
r = event.srcElement.createTextRange()
switch (event.keyCode)
{
case (8) :
if (!(sel.getClientRects().length > 1))
{
event.returnValue = true
return
}
code = sel.text
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
sel.setEndPoint("startToStart", tmp)
sel.text = sel.text.replace(/^\t/gm, "")
code = code.replace(/^\t/gm, "").replace(/\r\n/g, "\r")
r.findText(code)
r.select()
break
case (9) :
if (sel.getClientRects().length > 1)
{
code = sel.text
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
sel.setEndPoint("startToStart", tmp)
sel.text = "\t"+sel.text.replace(/\r\n/g, "\r\t")
code = code.replace(/\r\n/g, "\r\t")
r.findText(code)
r.select()
}
else
{
sel.text = "\t"
sel.select()
}
break
case (13) :
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
tmp.setEndPoint("endToEnd", sel)
for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++) tabs += "\t"
sel.text = "\r\n"+tabs
sel.select()
break
default :
event.returnValue = true
break
}
}
</script>
<textarea cols=75 rows=20 onkeydown="editTab()">
<script>
alert("ok")
</script>
</textarea>
文本框的上/下拉
<form name="cnbruce">
<textarea name="com">
</textarea>
</form>
<SPAN title='放大输入框' style='FONT-SIZE: 12px; CURSOR: hand' onclick=document.cnbruce.com.rows+=4>向下</SPAN>
<SPAN title='缩小输入框' style='FONT-SIZE: 12px; CURSOR: hand' class='arrow' onclick='if(document.cnbruce.com.rows>=4)document.cnbruce.com.rows-=4;else return false'>向上</SPAN>
一个复选框，点击之后一组复选框全部都选上
<input type="checkbox" name="checkA" onpropertychange="for(i=0;i<A.children.length;i++)">a
<br>
<span id="A">
<input type="checkbox" name="A1">
<input type="checkbox" name="A2">
<input type="checkbox" name="A3">
</span>
Debug Textarea：在线写 js 脚本的时候，用来即时查错的东西！
<HTML>
<HEAD>
<TITLE>Debug Textarea</TITLE>
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
</HEAD>
<style>
* {
font-size: 12px
}
body {
margin: 10px; padding: 0px
}
table.list{
cursor: default;
border:1px solid #cccccc
background-color: #cccccc;
border-collapse: collapse;
border-Color: #cccccc;
}
</style>
<script language="javascript">
// Coded by windy_sk <windy_sk@126.com> 20040205
function reportError(msg,url,line) {
var str = "You have found an error as below: \n\n";
str += "Err: " + msg + " on line: " + line;
alert(str);
return true;
}
window.onerror = reportError;
document.onkeydown = function() {
if(event.ctrlKey){
switch(event.keyCode) {
case 82: //r
runcode();
break;
case 83: //s
savecode();
break;
case 71: //g
goto(prompt('Please input the line number', '1'));
break;
case 65: //a
document.execCommand("SelectAll");
break;
case 67: //c
document.execCommand("Copy");
break;
case 88: //x
document.execCommand("Cut");
break;
case 86: //v
document.execCommand("Paste");
break;
case 90: //z
document.execCommand("Undo");
break;
case 89: //y
document.execCommand("Redo");
break;
default:
break;
}
event.keyCode = 0;
event.returnValue = false;
}
return;
}
function show_ln(){
var txt_ln = document.getElementById('txt_ln');
var txt_main = document.getElementById('txt_main');
txt_ln.scrollTop = txt_main.scrollTop;
while(txt_ln.scrollTop != txt_main.scrollTop) {
txt_ln.value += (i++) + '\n';
txt_ln.scrollTop = txt_main.scrollTop;
}
return;
}
function editTab(){
var code, sel, tmp, r
var tabs=''
event.returnValue = false
sel =event.srcElement.document.selection.createRange()
r = event.srcElement.createTextRange()
switch (event.keyCode){
case (8) :
if (!(sel.getClientRects().length > 1)){
event.returnValue = true
return
}
code = sel.text
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
// 出错检验代码~~~~~~
if(sel.parentElement() != tmp.parentElement()) return;
sel.setEndPoint('startToStart', tmp)
sel.text = sel.text.replace(/^\t/gm, '')
code = code.replace(/^\t/gm, '').replace(/\r\n/g, '\r')
r.findText(code)
r.select()
break
case (9) :
if (sel.getClientRects().length > 1){
code = sel.text
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
// 出错检验代码~~~~~~
if(sel.parentElement() != tmp.parentElement()) return;
sel.setEndPoint('startToStart', tmp)
sel.text = '\t'+sel.text.replace(/\r\n/g, '\r\t')
code = code.replace(/\r\n/g, '\r\t')
r.findText(code)
r.select()
}else{
sel.text = '\t'
sel.select()
}
break
case (13) :
tmp = sel.duplicate()
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top)
// 出错检验代码~~~~~~
if(sel.parentElement() != tmp.parentElement()) return;
tmp.setEndPoint('endToEnd', sel)
for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++) tabs += '\t'
sel.text = '\r\n'+tabs
sel.select()
break
default :
event.returnValue = true
break;
}
return;
}
function runcode() {
var str = document.getElementById("txt_main").value;
var code_win = window.open('about:blank');
code_win.document.open();
code_win.document.writeln("<script>");
code_win.document.writeln("function reportError(msg,url,line){\nline-=14;\nvar str='You have found an error as below: \\n\\n';\nstr+='Err: '+msg+' on line: '+(line);\nalert(str);\nopener.goto(line);\nopener.focus();\nwindow.onerror=null;\nsetTimeout('self.close()',10);\nreturn true;\n}");
code_win.document.writeln("window.onerror = reportError;");
code_win.document.writeln("<\/script>");
code_win.document.writeln(str);
code_win.document.close();
return;
}
function savecode() {
var str = document.getElementById("txt_main").value;
var code_win = window.open('about:blank','_blank','top=10000');
code_win.document.open();
code_win.document.writeln(str);
code_win.document.close();
code_win.document.execCommand('saveas','','code.html');
code_win.close();
return;
}
function goto(ln) {
if(!/^\d+$/.test(ln)) return;
var obj = document.getElementById("txt_main");
var rng = obj.createTextRange();
var arr = obj.value.replace(/\r/, "").split(/\n/);
if(ln>arr.length) ln = arr.length;
var str_tmp = "";
for(var i=0; i<ln-1; i++) {
str_tmp += arr[i];
}
rng.moveStart('character',str_tmp.length+1);
str_tmp = "";
for(i=ln; i<arr.length; i++) {
str_tmp += arr[i];
}
rng.moveEnd('character',-str_tmp.length);
rng.select();
return;
}
window.onload = function() {document.getElementById("txt_main").value = "<script>\nalert(')\n<\/script>";}
</script>
<BODY>
<table width='600' class='list' border='1' bgcolor='#eeeeee' bordercolorlight='#000000' bordercolordark='#FFFFFF' cellpadding='0' cellspacing='0'>
<tr bgcolor='#cccccc'>
<td colspan='2' height='20' align='center'><b>Debug Textarea</b></td>
</tr>
<tr>
<td colspan='2'>
<table width='95%' border='0' align='center' >
<tr>
<td align='center'><br />
<textarea id='txt_ln' name='content' rows='10' style='width:40px;overflow:hidden;height:200px;border-right:0px;text-align:right;line-height:14px' onselectstart='this.nextSibling.focus();return false' readonly></textarea><textarea id='txt_main' name='content' rows='10' cols='80' onkeydown='editTab()' onkeyup='show_ln()' onscroll='show_ln()' wrap='off' style='overflow:auto;height:200px;padding-left:5px;border-left:0px;line-height:14px'></textarea>
<script>for(var i=1; i<=20; i++) document.getElementById('txt_ln').value += i + '\n';</script>
</td>
</tr>
<tr>
<td align='center'><br />
<input type='button' value=' 运 行 ' onclick='runcode()' accesskey='r'>
<input type='button' value=' 保 存 ' onclick='savecode()' accesskey='s'>
<input type='button' value=' 跳 转 ' onclick="goto(prompt('Please input the line number', '1'))" accesskey='g'>
</td>
</tr>
</table>
</td>
</tr>
</table>
</BODY>
</HTML>
本文介绍了网页中如何通过JavaScript实现各种输入限制与交互控制，包括禁止使用键盘、限制输入内容类型、设置输入框功能（如只允许数字、IP地址等）、自适应文本行数、上传预览图片等功能。
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