*************************************************************

只能是写限定的东西

程序代码：

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

程序代码：＜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

程序代码：＜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

程序代码：

＜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

程序代码：＜script>
function show(){
alert('ascii代码是：'+event.keycode);
}
＜/script>
＜body onkeydown='show()'>

*************************************************************

只能是ip地址

程序代码：＜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{width:30;border:0;text-align:center}
＜/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

程序代码：
＜html>
＜head>
＜meta name='save' content='history'>
＜style>
.savehistory {behavior:url(#default#savehistory);}
＜/style>
＜/head>
＜body>
＜input class=savehistory type=text id=opersistinput>
＜input type=button onclick='javascript:location.href='http://www.cnbruce.com/red/'' 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

程序代码：

＜textarea rows=1 name=s1 cols=27 onpropertychange='this.style.posheight=this.scrollheight'>

*************************************************************

上传预览图片

程序代码：＜img id=pic src=/upfile/2007-11/20071117081655890.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

程序代码：＜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

程序代码：
＜select onchange='if(this.selectedindex && this.selectedindex!=0){window.open(this.value);}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

程序代码：＜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

程序代码：＜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

程序代码：

＜input type='checkbox' name='checka' onpropertychange='for(i=0;i＜a.children.length;i++){a.children[i].checked=this.checked}'>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！

程序代码：＜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>

*************************************************************

tab键在文本域中的体现

程序代码：＜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>

*************************************************************

获取input的非value值，而是显示文本值

程序代码：
＜select name='sss' onchange='alert(this.options[this.selectedindex].text)'>
＜option value='1'>asdf＜/option>
＜option value='2'>bbbb＜/option>
＜option value='3'>ccc＜/option>
＜/select>

*************************************************************

select里的option进行分类列表

程序代码：
＜span style='position:absolute;border:1px inset #d3d6d9'>＜select style='margin:-2px; width:200px'>
＜option selected>------------请选择------------＜/option>
＜optgroup label='javascript&vbscript区'>
＜option>原 创
＜option>经 典
＜optgroup label='后台区'>
＜option>asp&sql
＜option>php&mysql
＜/select>＜/span>

*************************************************************

动态添加

程序代码：＜form name='myform' method='post'> ＜select name='dept_company' size='10' multiple id='dept_company' class='myselect'> ＜option value=''>please select...＜/option> ＜option value='a'>aa＜/option> ＜option value='b'>bb＜/option> ＜option value='c'>cc＜/option> ＜/select>＜input name='dept_company_list' type='hidden'> ＜input name='button' type='button' class='mybutton' onclick='additem('dept_company','dept_company2')' value='添加-->>'> ＜input name='button' type='button' class='mybutton' onclick='deleteitem('dept_company2','dept_company')' value='<<--删除'> ＜select name='dept_company2' size='10' multiple id='dept_company2' class='myselect'> ＜/select> ＜/form> ＜script> function additem(fromname,toname){ eval('var obj1=myform.'+fromname); eval('var obj2=myform.'+toname); obj1.options[0].selected=false; if(obj1.selectedindex == -1) return false; var tempvalue; var temptext; for(var i=1;i＜obj1.length;i++){ //begin from 1 if(obj1.selectedindex == -1)break; tempvalue=obj1.options[obj1.selectedindex].value; temptext=obj1.options[obj1.selectedindex].text; obj1.options[obj1.selectedindex]=null; obj2.add(new option(temptext,tempvalue),0); } } function deleteitem(fromname,toname){ eval('var obj1=myform.'+fromname); eval('var obj2=myform.'+toname); if(obj1.selectedindex == -1) return false; var tempvalue; var temptext; for(var i=0;i＜obj1.length;i++){ //begin from 0 if(obj1.selectedindex == -1)break; tempvalue=obj1.options[obj1.selectedindex].value; temptext=obj1.options[obj1.selectedindex].text; obj1.options[obj1.selectedindex]=null; obj2.add(new option(temptext,tempvalue),1); //additem index is 1 } } ＜/script>

*************************************************************

提示限制输入的字符数

程序代码：
＜script language='javascript'>
＜!--

function symerror()
{
return true;
}

window.onerror = symerror;

function strlength(str){
var l=str.length;
var n=l
for (var i=0;i＜l;i++)
{
if (str.charcodeat(i)＜0||str.charcodeat(i)>255) n++
}
return n
}

function changebyte(value,length){
var l=strlength(value)
if (l＜=length) {
if (document.all!=null) document.all('byte').innertext='还可以输入'+(length-l)+'字节'
}
else
{
document.all('byte').innertext='输入字节数超出范围'
}
return true
}

function changebyte1(value,length){
var l=strlength(value)
if (l＜=length) {
if (document.all!=null) document.all('byte1').innertext='还可以输入'+(length-l)+'字节'
}
else
{
document.all('byte1').innertext='输入字节数超出范围'
}
return true
}

function changebyte2(value,length){
var l=strlength(value)
if (l＜=length) {
if (document.all!=null) document.all('byte2').innertext='还可以输入'+(length-l)+'字节'
}
else
{
document.all('byte2').innertext='输入字节数超出范围'
}
return true
}
＜/script>
＜form method='post' name=test onsubmit='return checkdata()' action=''>
＜textarea onkeydown='return changebyte1(document.test.icqcontent.value,198)' onkeyup='return changebyte1(document.test.icqcontent.value,198)' name=icqcontent cols=40 rows='3'>＜/textarea>
＜span id=byte1>＜script language=javascript>changebyte1(document.test.icqcontent.value,198);＜/script>＜/span>
＜/form>

*************************************************************

判断填写字数的限制

程序代码：
＜script language=javascript>
function gbcount(message,total,used,remain)
{
var max;
max&n, bsp;= total.value;
if(message.value.length > max){
message.value = message.value.substring(0,max);
used.value = max;
remain.value = 0;
alert('留言不能超过规定的字数!');
}
else{
used.value = message.value.length;
remain.value = max - used.value;
}
}
＜/script>

＜form name='myform' >
＜textarea name='guestcontent' cols='59' rows='6' onkeydown=gbcount(this.form.guestcontent,this.form.total,this.form.used,this.form.remain); onkeyup=gbcount(this.form.guestcontent,this.form.total,this.form.used,this.form.remain);>＜/textarea>
最多字数：＜input disabled maxlength=4 name=total size=3 value=20>
已用字数：＜input disabled maxlength=4 name=used size=3 value=0>
剩余字数：＜input disabled maxlength=4 name=remain size=3>
＜/form>