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/**
* jQuery byteLimit plugin.
*
* @author Jan Paul Posma, 2011
* @author Timo Tijhof, 2011-2012
*/
( function ( $ ) {
/**
* Utility function to trim down a string, based on byteLimit
* and given a safe start position. It supports insertion anywhere
* in the string, so "foo" to "fobaro" if limit is 4 will result in
* "fobo", not "foba". Basically emulating the native maxlength by
* reconstructing where the insertion occured.
*
* @param {string} safeVal Known value that was previously returned by this
* function, if none, pass empty string.
* @param {string} newVal New value that may have to be trimmed down.
* @param {number} byteLimit Number of bytes the value may be in size.
* @param {Function} fn [optional] See $.fn.byteLimit.
* @return {Object} Object with:
* - {string} newVal
* - {boolean} trimmed
*/
function trimValForByteLength( safeVal, newVal, byteLimit, fn ) {
var startMatches, endMatches, matchesLen, inpParts,
oldVal = safeVal;
// Run the hook if one was provided, but only on the length
// assessment. The value itself is not to be affected by the hook.
if ( $.byteLength( fn ? fn( newVal ) : newVal ) <= byteLimit ) {
// Limit was not reached, just remember the new value
// and let the user continue.
return {
newVal: newVal,
trimmed: false
};
}
// Current input is longer than the active limit.
// Figure out what was added and limit the addition.
startMatches = 0;
endMatches = 0;
// It is important that we keep the search within the range of
// the shortest string's length.
// Imagine a user adds text that matches the end of the old value
// (e.g. "foo" -> "foofoo"). startMatches would be 3, but without
// limiting both searches to the shortest length, endMatches would
// also be 3.
matchesLen = Math.min( newVal.length, oldVal.length );
// Count same characters from the left, first.
// (if "foo" -> "foofoo", assume addition was at the end).
while (
startMatches < matchesLen &&
oldVal.charAt( startMatches ) === newVal.charAt( startMatches )
) {
startMatches += 1;
}
while (
endMatches < ( matchesLen - startMatches ) &&
oldVal.charAt( oldVal.length - 1 - endMatches ) === newVal.charAt( newVal.length - 1 - endMatches )
) {
endMatches += 1;
}
inpParts = [
// Same start
newVal.substring( 0, startMatches ),
// Inserted content
newVal.substring( startMatches, newVal.length - endMatches ),
// Same end
newVal.substring( newVal.length - endMatches )
];
// Chop off characters from the end of the "inserted content" string
// until the limit is statisfied.
if ( fn ) {
while ( $.byteLength( fn( inpParts.join( '' ) ) ) > byteLimit ) {
inpParts[1] = inpParts[1].slice( 0, -1 );
}
} else {
while ( $.byteLength( inpParts.join( '' ) ) > byteLimit ) {
inpParts[1] = inpParts[1].slice( 0, -1 );
}
}
newVal = inpParts.join( '' );
return {
newVal: newVal,
trimmed: true
};
}
var eventKeys = [
'keyup.byteLimit',
'keydown.byteLimit',
'change.byteLimit',
'mouseup.byteLimit',
'cut.byteLimit',
'paste.byteLimit',
'focus.byteLimit',
'blur.byteLimit'
].join( ' ' );
/**
* Enforces a byte limit on an input field, so that UTF-8 entries are counted as well,
* when, for example, a database field has a byte limit rather than a character limit.
* Plugin rationale: Browser has native maxlength for number of characters, this plugin
* exists to limit number of bytes instead.
*
* Can be called with a custom limit (to use that limit instead of the maxlength attribute
* value), a filter function (in case the limit should apply to something other than the
* exact input value), or both. Order of parameters is important!
*
* @context {jQuery} Instance of jQuery for one or more input elements
* @param {Number} limit [optional] Limit to enforce, fallsback to maxLength-attribute,
* called with fetched value as argument.
* @param {Function} fn [optional] Function to call on the string before assessing the length.
* @return {jQuery} The context
*/
$.fn.byteLimit = function ( limit, fn ) {
// If the first argument is the function,
// set fn to the first argument's value and ignore the second argument.
if ( $.isFunction( limit ) ) {
fn = limit;
limit = undefined;
// Either way, verify it is a function so we don't have to call
// isFunction again after this.
} else if ( !fn || !$.isFunction( fn ) ) {
fn = undefined;
}
// The following is specific to each element in the collection.
return this.each( function ( i, el ) {
var $el, elLimit, prevSafeVal;
$el = $( el );
// If no limit was passed to byteLimit(), use the maxlength value.
// Can't re-use 'limit' variable because it's in the higher scope
// that would affect the next each() iteration as well.
// Note that we use attribute to read the value instead of property,
// because in Chrome the maxLength property by default returns the
// highest supported value (no indication that it is being enforced
// by choice). We don't want to bind all of this for some ridiculously
// high default number, unless it was explicitly set in the HTML.
// Also cast to a (primitive) number (most commonly because the maxlength
// attribute contains a string, but theoretically the limit parameter
// could be something else as well).
elLimit = Number( limit === undefined ? $el.attr( 'maxlength' ) : limit );
// If there is no (valid) limit passed or found in the property,
// skip this. The < 0 check is required for Firefox, which returns
// -1 (instead of undefined) for maxLength if it is not set.
if ( !elLimit || elLimit < 0 ) {
return;
}
if ( fn ) {
// Save function for reference
$el.data( 'byteLimit.callback', fn );
}
// Remove old event handlers (if there are any)
$el.off( '.byteLimit' );
if ( fn ) {
// Disable the native maxLength (if there is any), because it interferes
// with the (differently calculated) byte limit.
// Aside from being differently calculated (average chars with byteLimit
// is lower), we also support a callback which can make it to allow longer
// values (e.g. count "Foo" from "User:Foo").
// maxLength is a strange property. Removing or setting the property to
// undefined directly doesn't work. Instead, it can only be unset internally
// by the browser when removing the associated attribute (Firefox/Chrome).
// http://code.google.com/p/chromium/issues/detail?id=136004
$el.removeAttr( 'maxlength' );
} else {
// If we don't have a callback the bytelimit can only be lower than the charlimit
// (that is, there are no characters less than 1 byte in size). So lets (re-)enforce
// the native limit for efficiency when possible (it will make the while-loop below
// faster by there being less left to interate over).
$el.attr( 'maxlength', elLimit );
}
// Safe base value, used to determine the path between the previous state
// and the state that triggered the event handler below - and enforce the
// limit approppiately (e.g. don't chop from the end if text was inserted
// at the beginning of the string).
prevSafeVal = '';
// We need to listen to after the change has already happened because we've
// learned that trying to guess the new value and canceling the event
// accordingly doesn't work because the new value is not always as simple as:
// oldValue + String.fromCharCode( e.which ); because of cut, paste, select-drag
// replacements, and custom input methods and what not.
// Even though we only trim input after it was changed (never prevent it), we do
// listen on events that input text, because there are cases where the text has
// changed while text is being entered and keyup/change will not be fired yet
// (such as holding down a single key, fires keydown, and after each keydown,
// we can trim the previous one).
// See http://www.w3.org/TR/DOM-Level-3-Events/#events-keyboard-event-order for
// the order and characteristics of the key events.
$el.on( eventKeys, function () {
var res = trimValForByteLength(
prevSafeVal,
this.value,
elLimit,
fn
);
// Only set value property if it was trimmed, because whenever the
// value property is set, the browser needs to re-initiate the text context,
// which moves the cursor at the end the input, moving it away from wherever it was.
// This is a side-effect of limiting after the fact.
if ( res.trimmed === true ) {
this.value = res.newVal;
}
// Always adjust prevSafeVal to reflect the input value. Not doing this could cause
// trimValForByteLength to compare the new value to an empty string instead of the
// old value, resulting in trimming always from the end (bug 40850).
prevSafeVal = res.newVal;
} );
} );
};
}( jQuery ) );