The length of string input in the JS verification text box. Chinese characters are supported.

 

JS Code

Function checklen (OBJ, Len ){
If (obj. value. Replace (/[^/x00-/xFF]/g, '**'). length> = Len ){
OBJ. value = leftutfstring (obj. Value, Len );
}
}
 
Function getstringutflength (STR ){
VaR value = Str. Replace (/[^/x00-/xFF]/g ,"");
Return Value. length;
}

 

Function leftutfstring (STR, Len ){
If (getstringutflength (STR) <= Len)
Return STR;
VaR value = Str. substring (0, Len );
 
While (getstringutflength (value)> Len ){
Value = value. substring (0, value. Length-1 );
}
Return value;
}

 

 

Call method: (onkeyup (this, character length) is as follows: if the number of characters exceeds 1000 (or 500 Chinese characters, the text box cannot be entered, copy and paste the content after 1000 characters)

<Textarea Cols = "65" rows = "4" name = "txtremarkitem" id = "txtremarkitem" onkeyup = "checklen (this, 1000)"> </textarea>