js code to limit text bytes in form_form effects

/*
value: value;
byteLength: database byte length
title: field Chinese name
attribute: attribute name
Instructions for use:

Add (1) onkeyup="limitLength(this.value,100,'name','name')"
        (2) id="name" or [struts tag] styleId="name"
Note: id name and attribute The attribute names should be the same

Example: <br><br> or <br><br><input> <br><br>*/ <br><br><br><br>function limitLength(value, byteLength, title, attribute) { <br> var newvalue = value.replace(/[^x00-xff]/g, "**"); <br> var length = newvalue.length; <br><br> //When the number of bytes filled in is less than the set number of bytes <br> if (length * 1 return; <br> } <br> var limitDate = newvalue .substr(0, byteLength); <br> var count = 0; <br> var limitvalue = ""; <br> for (var i = 0; i var flat = limitDate.substr(i, 1); <br> if (flat == "*") { <br> var size = 0; <br> var size = 0; 🎜> var istar = newvalue .substr(byteLength * 1 - 1, 1);//Whether the check point is "×" <br><br> //if the base point is ×; determine whether there is an even number or an odd number of × in the base point <br> if ( count % 2 == 0) { <br>                 // When it is an even number                                                                                                                                                                                                                                                         not not not and not and not having to do, > } else { <br>           // When it is an odd number<br>             size = (count - 1) / 2 (byteLength * 1- count);                                                                             } <br> alert(title "Maximum input" byteLength "bytes (equivalent to " byteLength /2 " Chinese characters)! "); <br> document.getElementById(attribute).value = limitvalue; <br> return; <br>}