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开发中收藏的JS代码

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<!--

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{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: 

<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.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){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

<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.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>

   获取input的非value值,而是显示文本值

<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

<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

<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--&gt;&gt;">
         <input name="button" type="button" class="myButton" onClick="deleteItem('dept_company2','dept_company')" value="&lt;&lt;--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

<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

<script language=javascript>
function gbcount(message,total,used,remain)
{
   var max;
   max = 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>


-------------------------------------------------------------------------------------------------------------------------------

1.oncontextmenu="window.event.returnvalue=false" 将彻底屏蔽鼠标右键
<table border oncontextmenu=return(false)><td>no</table> 可用于Table

2<body onselectstart="return false"> 取消选取、防止复制

3onpaste="return false" 不准粘贴

4oncopy="return false;" oncut="return false;" 防止复制

5<link rel="Shortcut Icon" href="favicon.ico"> IE地址栏前换成自己的图标

6<link rel="Bookmark" href="favicon.ico"> 可以在收藏夹中显示出你的图标

7<input style="ime-mode:disabled"> 关闭输入法

8永远都会带着框架
<script language="javascript">
if (window == top)top.location.href = "frames.htm"; //frames.htm为框架网页
</script>

9防止被人frame
<SCRIPT LANGUAGE=javascript> 
if (top.location != self.location)top.location=self.location;
</SCRIPT>

10<noscript><iframe src=*.html></iframe></noscript> 网页将不能被另存为

11<input type=button value=查看网页源代码 
onclick="window.location = 'view-source:'+ 'http://www.htmlcn.com/'">

12取得控件的绝对位置

//javascript
<script language="javascript">
function getIE(e){
var t=e.offsetTop;
var l=e.offsetLeft;
while(e=e.offsetParent){
t+=e.offsetTop;
l+=e.offsetLeft;
}
alert("top="+t+"\nleft="+l);
}
</script>

//VBScript
<script language="VBScript">
function getIE()
dim t,l,a,b
set a=document.all.img1
t=document.all.img1.offsetTop
l=document.all.img1.offsetLeft
while a.tagName<>"BODY"
set a = a.offsetParent
t=t+a.offsetTop
l=l+a.offsetLeft
wend
msgbox "top="&t&chr(13)&"left="&l,64,"得到控件的位置"
end function
></script>

13光标是停在文本框文字的最后
<script language="javascript">
function cc()
{
var e = event.srcElement;
var r =e.createTextRange();
r.moveStart('character',e.value.length);
r.collapse(true);
r.select();
}
</script>
<input type=text name=text1 value="123" onfocus="cc()">

14最小化、最大化、关闭窗口
<object id=hh1 classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11"> 
<param name="Command" value="Minimize"></object>
<object id=hh2 classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11"> 
<param name="Command" value="Maximize"></object>
<OBJECT id=hh3 classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11">
<PARAM NAME="Command" value="Close"></OBJECT>

<input type=button value=最小化 onclick=hh1.Click()>
<input type=button value=最大化 onclick=hh2.Click()>
<input type=button value=关闭 onclick=hh3.Click()>
本例适用于IE

-->
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