常用JS代码收集常用JS代码收集
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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-->>">
<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
<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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