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Precisely control the number of Chinese and English characters in the input box

Source: Internet
Author: User
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<Script language = "JavaScript" type = "text/JavaScript">
<! --

Function limitlength (value, bytelength, attribute)
{
VaR newvalue = value. Replace (/[^ \ x00-\ xFF]/g ,"**");
VaR length = newvalue. length;

// When the number of bytes entered is smaller than the set number of bytes
If (length * 1 <= bytelength * 1)
{
Return;
}
VaR limitdate = newvalue. substr (0, bytelength );
VaR COUNT = 0;
VaR limitvalue = "";
For (VAR I = 0; I <limitdate. length; I ++)
{
VaR flat = limitdate. substr (I, 1 );
If (flat = "*")
{
Count ++;
}
}
VaR size = 0;
VaR istar = newvalue. substr (bytelength * 1-1, 1); // check whether the checkpoint is "×"

// If the base point is X; determines whether X is an even number or an odd number within the base point.
If (count % 2 = 0)
{
// When the value is an even number
Size = count/2 + (bytelength * 1-count );
Limitvalue = value. substr (0, size );
}
Else
{
// When the value is an odd number
Size = (count-1)/2 + (bytelength * 1-count );

Limitvalue = value. substr (0, size );
}
Alert ("maximum input" + bytelength + "bytes (equivalent to" + bytelength/2 + "Chinese characters )! ");
Document. getelementbyid (attribute). value = limitvalue;
// Document. getelementbyid ("MSG"). innerhtml = bytelength;
Return;
}


// -->
</SCRIPT>

 

<Asp: textbox runat = "server" id = "txtcomment" Height = "77px"
Ontextchanged = "txtcomment_textchanged" textmode = "multiline" width = "307px"> </ASP: textbox>
<Textarea runat = "server" Cols = "50" rows = "10" name = "Explain" id = "Explain"> </textarea>

 

Add:

Explain. attributes ["onpropertychange"] = "limitlength (this. Value, 10, 'explain ')";

 

 

Complete page front-endCodeYes:

 

<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>

<% @ Register Assembly = "ajaxcontroltoolkit" namespace = "ajaxcontroltoolkit" tagprefix = "PC3" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> dropdownlist </title>
<Script language = "JavaScript" type = "text/JavaScript">
<! --
Function limitlength (value, bytelength, attribute)
{
VaR newvalue = value. Replace (/[^ \ x00-\ xFF]/g ,"**");
VaR length = newvalue. length;

// When the number of bytes entered is smaller than the set number of bytes
If (length * 1 <= bytelength * 1)
{
Return;
}
VaR limitdate = newvalue. substr (0, bytelength );
VaR COUNT = 0;
VaR limitvalue = "";
For (VAR I = 0; I <limitdate. length; I ++)
{
VaR flat = limitdate. substr (I, 1 );
If (flat = "*")
{
Count ++;
}
}
VaR size = 0;
VaR istar = newvalue. substr (bytelength * 1-1, 1); // check whether the checkpoint is "×"

// If the base point is X; determines whether X is an even number or an odd number within the base point.
If (count % 2 = 0)
{
// When the value is an even number
Size = count/2 + (bytelength * 1-count );
Limitvalue = value. substr (0, size );
}
Else
{
// When the value is an odd number
Size = (count-1)/2 + (bytelength * 1-count );

Limitvalue = value. substr (0, size );
}
Alert ("maximum input" + bytelength + "English (or" + bytelength/2 + "Chinese characters )! ");
Document. getelementbyid (attribute). value = limitvalue;
// Document. getelementbyid ("MSG"). innerhtml = bytelength;
Return;
}


// -->
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">

<Textarea runat = "server" Cols = "50" rows = "10" name = "Explain" id = "Explain"> </textarea>

</Form>

</Body>
</Html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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