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/**
* jQuery byteLimit
*
* @author Jan Paul Posma
*/
( function( $ ) {
/**
* Enforces a byte limit to a textbox, so that UTF-8 entries are not arbitrarily truncated.
*/
$.fn.byteLimit = function( limit ) {
// Default to current attribute value
if ( limit == null ) {
limit = this.attr( 'maxLength' );
// If passed, update/set attribute value instead
} else {
this.attr( 'maxLength', limit );
}
// Nothing passed and/or empty attribute, return without binding an event.
if ( limit == null ) {
return this;
}
// We've got something, go for it:
return this.keypress( function( e ) {
// First check to see if this is actually a character key
// being pressed.
// Based on key-event info from http://unixpapa.com/js/key.html
// jQuery should also normalize e.which to be consistent cross-browser,
// however the same check is still needed regardless of jQuery.
// Note: At the moment, for some older opera versions (~< 10.5)
// some special keys won't be recognized (aka left arrow key).
// Backspace will be, so not big issue.
if ( e.which === 0 || e.charCode === 0 || e.which === 8 ||
e.ctrlKey || e.altKey || e.metaKey )
{
return true; //a special key (backspace, etc) so don't interfere.
}
var len = $.byteLength( this.value );
// Note that keypress returns a character code point, not a keycode.
// However, this may not be super reliable depending on how keys come in...
var charLen = $.byteLength( String.fromCharCode( e.which ) );
if ( ( len + charLen ) > limit ) {
e.preventDefault();
}
});
};
} )( jQuery );
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