js limit numbers js limit input implementation code

1. Only Chinese characters can be entered

Copy the codeThe code is as follows:

 
<input onkeyup="value=(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="('text',('text').replace(/[^\u4E00-\u9FA5]/g,''))"> 

2. Only numbers can be entered

Copy the codeThe code is as follows:

 
<input onkeyup="value=(/[^\d]/g,'') "onbeforepaste="('text',('text').replace(/[^\d]/g,''))"> 

Simple prohibition on Chinese characters

Copy the codeThe code is as follows:

Enter the number and the decimal point:

Copy the codeThe code is as follows:

onkeyup="value=(/[^\d{1,}\.\d{1,}|\d{1,}]/g,'')"

javascript can only enter numbers and ":".2007-11-24 15:50<input type=text onkeyup="=(/[^\d&:]/g,'')" onblur="=(/[^\d&:]/g,'')" onafterpaste="=(/[^\d&:]/g,'')"/>
Only numbers and ":", for example, can be used when entering time.

Copy the codeThe code is as follows:

 
<input type=text  onkeyup="value=(/[^\w&=]|_/ig,'')" onblur="value=(/[^\w&=]|_/ig,'')" /> 

You can only enter letters and equal signs, but you cannot enter Chinese characters.

Other things：
Script that can only enter numbers javascript--

Copy the codeThe code is as follows:

The first half of the sentence means that the keyboard type can only be numbers, and the second half of the sentence can only be numbers when it is pasted.

Copy the codeThe code is as follows:

 
<input name=txt1 onchange="if(/\D/.test()){alert('Only enter numbers');='';}">
<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"> 

Limit only digits and English

Copy the codeThe code is as follows:

 
function isregname( checkobj) 
{ 
var checkOK = "0123456789-_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
var checkStr = checkobj; 
var allValid = true; 
var decPoints = 0; 
for (i = 0; i < ; i++) 
{ 
ch = (i); 
for (j = 0; j < ; j++) 
if (ch == (j)) 
break; 
if (j == ) 
{ 
allValid = false; 
break; 
} 
} 
return (allValid) 
} 
---------------- 
if(!(isregname())){ 
alert("[member code] does not comply with the specifications, the member code can only be in English letters or numbers");
(); 
return(false); 
} 
if(!(isregname())){ 
alert("[password] does not comply with the specifications, the password can only be in English letters or numbers");
(); 
return(false); 
} 

Enter only English and numeric input boxes

Copy the codeThe code is as follows:

 
<input onkeyup="value=(/[\W]/g,'') "onbeforepaste="('text',('text').replace(/[^\d]/g,''))"> 

5. You can use Javascript to check the text box to filter out non-0-9 characters

Copy the codeThe code is as follows:

 
<script language="javascript" event="onkeydown" for="document"> 
 if(=='TextBox1') 
 { 
 if(!KeyIsNumber()) 
 { 
return false;//This sentence is the most critical
 } 
 } 
</script> 
<script language="javascript"> 
function KeyIsNumber(KeyCode) 
{ 
//If the input character is between 0-9, or the backspace or DEL key
 if(((KeyCode>47)&&(KeyCode<58))||(KeyCode==8)||(KeyCode==46)) 
 { 
 return true; 
 } 
 else 
 { 
 return false; 
 } 
} 
</script>[url=/xujh/admin/][/url] 

6. Restricted to the text box, only the IP address format can be entered.

Copy the codeThe code is as follows:

 
<HTML> 
<head> 
<meta http-equiv="Content-Type" content="text/HTML; charset=gb2312"> 
<meta name="GENERATOR" content="Microsoft FrontPage 4.0"> 
<meta name="ProgId" content=""> 
<style> 
.a3{width:30;border:0;text-align:center} 
</style> 
<script> 
function mask(obj){ 
=(/[^\d]/g,'') 
key1= 
if (key1==37 || key1==39) 
{ (); 
nextip=parseInt((2,1)) 
nextip=key1==37?nextip-1:nextip+1; 
nextip=nextip>=5?1:nextip 
nextip=nextip<=0?4:nextip 
eval("ip"+nextip+".focus()") 
} 
if(>=3) 
if(parseInt()>=256 || parseInt()<=0) 
{ 
alert(parseInt()+"IP address error!")
="" 
() 
return false; 
} 
else 
{ (); 
nextip=parseInt((2,1))+1 
nextip=nextip>=5?1:nextip 
nextip=nextip<=0?4:nextip 
eval("ip"+nextip+".focus()") 
} 
} 
function mask_c(obj) 
{ 
('text',('text').replace(/[^\d]/g,'')) 
} 
</script> 
<title>IP address input</title>
</head> 
<body>IP address input
<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> 