我从 password123 插件中收到此错误，但不确定可能是什么原因，因为它在以前的项目中运行良好。也许是更新版本的 jquery。
当页面中有输入密码字段时它工作正常，虽然显示以下错误然后没有。我怎样才能解决这个问题？
错误：TypeError：elem 未定义源文件： http ://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.js 行：1719
var noData = elem.nodeName && jQuery.noData[ elem.nodeName.toLowerCase()
堵塞：
// A method for determining if a DOM node can handle the data expando
acceptData: function( elem ) {
var noData = elem.nodeName && jQuery.noData[ elem.nodeName.toLowerCase() ];
// nodes accept data unless otherwise specified; rejection can be conditional
return !noData || noData !== true && elem.getAttribute("classid") === noData;
}
文档准备好：
$('input:password').password123({
character: "●"
});
完整插件：
/**
* @preserve jQuery password123: iPhone Style Passwords Plugin - v1.5 - 2/1/2011
* http://timmywillison.com/samples/password123/
* Copyright (c) 2011 timmy willison
* Dual licensed under the MIT and GPL licences.
* http://timmywillison.com/licence/
*/
// *Version: 1.5, Last updated: 2/1/2011*
//
// Demo - http://timmywillison.com/samples/password123/
// Testing - http://timmywillison.com/samples/password123/qunit/test/
// GitHub - http://github.com/timmywil/password123
// Source - http://github.com/timmywil/password123/raw/master/jquery.password123.js (13.8kb)
// (Minified) - http://github.com/timmywil/password123/raw/master/jquery.password123.min.js (5.2kb)
//
// License
//
// Copyright (c) 2011 timmy willison,
// Dual licensed under the MIT and GPL licenses.
// http://timmywillison.com/licence/
//
// Support and Testing
//
// Versions of jQuery and browsers this was tested on.
//
// jQuery Versions - 1.3.2-1.5
// Browsers Tested - Internet Explorer 6-8, Firefox 2-3.7, Safari 3-5,
// Chrome 4-6, Opera 9.6-10.5.
//
// Release History
//
// 1.5 - (2/1/2011) Added widget-style option method, only instantiate when not calling a method
// 1.4 - (2/1/2011) Restructured plugin, added destroy method, added tests
// 1.3 - (11/23/2010) Added Google Closure Compiler comments, common password field attribute
// support when replacing fields, and no longer sends placeholder value when submitting the form.
// 1.2 - (9/28/2010) Placeholders changed to only work with HTML5 placeholder attribute,
// 'value' attribute now reserved for actual values
// 1.1 - (7/5/2010) Add Placeholder functionality
// 1.0 - (7/4/2010) Initial release
//
// See README for usage and placeholder explanation
;(function ($, window, document, undefined) {
// Extend jQuery
$.fn.password123 = function ( options ) {
var instance = $.data( this[0], "password123" ),
args = Array.prototype.slice.call( arguments, 1 );
// Catch method calls
if ( !!instance && typeof options === "string" && options.charAt( 0 ) !== "_" && instance[ options ] ) {
args.unshift( this );
return instance[ options ].apply( instance, args );
}
return this.map(function( i, elem ) {
// Returns the new password fields for chaining
// Old password fields are removed
return new password123._init( elem, options );
});
};
var clear_timeout = window.clearTimeout,
counter = 0,
password123 = {
_init: function( elem, options ) {
// Catch fields that aren't password fields
if ( !elem.type === "password" ) {
return elem;
}
var self = this;
// Continue regularly
self.options = $.extend({
// You can use any html character code or
// plain text character
character: "•",
// This is the delay(ms) for when the last
// character will change
delay: 2000,
// Use any prefix you like for the new
// field ids, but they will always be zero-indexed
prefix: "iField",
// Enable the override of the placeholder attribute
placeholder: true,
// With this classname, you can set placeholder
// specific styles in your own css
placeholderClass: 'input_placeholder',
// When true, this will mask the placeholder or initial value
maskInitial: false
}, options);
// HTML encode the character
self.encodedChar = $('<div>'+ self.options.character +'</div>').text();
// Replace the fields with what we need
// and store in var fields
self.$field = self._replaceField( elem )
// Bind textchange to the fields with
// the letterChange function
.bind('textchange', function() {
self._letterChange.call( self );
});
// Add placeholder stuff
if ( self.options.placeholder ) {
self._bindPlaceholder();
}
// Mask the placeholder or initial value if needed
if ( self.options.maskInitial ) {
self.$field.keyup();
}
// Return the new password field
return self.$field[0];
},
/**
* Replaces the password field with a hidden field
* and adds the new visible text field.
* @param {object} $field One field to replace
* @return {object} The new text field.
* @private
*/
_replaceField: function( field ) {
var self = this,
$field = $(field),
place = $field.attr('placeholder') || undefined,
field_id = self.options.prefix + counter++,
value = $field.val() || ( self.options.placeholder ? place || '' : '' ),
classes = self.options.placeholder && place !== undefined && (value === place || value === '') ?
field.className + ' ' + self.options.placeholderClass :
field.className,
attrs = { 'class': classes, 'id': field_id, 'value': value, 'placeholder': self.options.placeholder ? undefined : place },
standards = [ 'size', 'tabindex', 'readonly', 'disabled', 'maxlength' ];
// Combine attrs with standard attrs
for ( var i = 0; i < standards.length; i++ ) {
var attr = $field.attr( standards[i] );
attrs[ standards[i] ] = attr && attr > -1 ? attr : undefined;
}
// The hidden field that will get sent with the form
self.$hidden = $('<input type="hidden"/>')
.attr({
'name': $field.attr('name'),
'id': field.id,
'class': field.className,
'disabled': $field.attr('disabled')
})
.replaceAll( $field )
.val( value !== place ? value : '' );
self.$oldField = $field;
// The main field
return $('<input type="text"/>')
.attr( attrs )
.insertAfter( self.$hidden )
.data({
'value': $field.val() || '', // If value was set, fill it in correctly
'placeholder': place, // Attach placeholder for comparison to value
'newVal': value, // This to avoid sending the placeholder value when submitting the form
'password123': self // Attach the instance of this plugin
});
},
/**
* Calls for the necessary adjustments when
* a field is changed
* @private
*/
_letterChange: function( elem ) {
var fv = this.$field.val();
if ( fv.length > this.$field.data('value').length ) {
// Apply fieldChange as normal
this.$field.data( 'value', this._fieldChange() );
} else if ( fv.length < this.$field.data('value').length ) {
// Clear the timeout for the last character
clear_timeout( this.last );
var old = this.$hidden.val(),
newVal;
if ( fv.length < old.length - 1 ) {
newVal = old.substr( 0, fv.length );
} else {
var cp = this._getCursorPosition();
// Create the new value with the correct
// character deleted
newVal = old.length > cp + 1 && cp > -1
? old.slice(0, cp).concat(old.slice(cp + 1))
: old.slice(0, cp);
}
// Update data and the hidden input
this.$field.data({ 'value': fv, 'newVal': newVal });
if ( newVal !== this.$field.data('placeholder') ) {
this.$hidden.val( newVal );
}
}
return this;
},
/**
* Updates the field with the dots as the user types,
* and sets the timeout for the last char.
* @return {string} The new value to set to field.data
* @private
*/
_fieldChange: function() {
var self = this;
// Clear the timeout for the last character
clear_timeout( self.last );
var fv = self.$field.val(), len = fv.length,
old = self.$hidden.val(),
cp = self._getCursorPosition(),
newVal;
// Update the hidden value with the correct value
// depending on cursor position
newVal = old.length > cp + 1 && cp > -1
? old.substr(0, cp-1) + fv.charAt(cp-1) + old.substr(cp-1)
: old + fv.charAt(len - 1);
self.$field.data('newVal', newVal);
if ( newVal !== self.$field.data('placeholder') ) {
self.$hidden.val( newVal );
}
if ( len > 1 ) {
// Loop through and change all characters
for ( var i = 0; i < len - 1; i++ ) {
fv = fv.replace( fv.charAt(i), self.encodedChar );
}
// Update the field
self.$field.val( fv );
}
if ( len > 0 ) {
// Set the timeout for the last character
self.last = setTimeout(function () {
cp = self._getCursorPosition();
fv = self.$field.val();
fv = fv.replace( fv.charAt(len - 1), self.encodedChar );
self.$field.val( fv ).data('value', fv);
// Reset cursor position to what it was if not at end
if ( cp != len ) {
self._setCursorPosition( cp );
}
}, self.options.delay);
}
// Reset cursor position to what it was if not at end
if ( cp != len ) {
self._setCursorPosition( cp );
}
return fv;
},
/**
* Placeholder functionality
* @private
*/
_bindPlaceholder: function() {
var self = this,
place = self.$field.data('placeholder');
if ( place !== undefined ) {
self.$field.bind({
"focus.password123": function() {
// Compare the hidden value with the placeholder value
if ( self.$field.data('newVal') === place ) {
self.$field.val('').removeClass( self.options.placeholderClass ).data( 'newVal', '' );
self.$hidden.val('');
}
},
"blur.password123": function() {
// If it's empty, put the placeholder in as the value
if ( place !== undefined && self.$field.val() === '' ) {
self.$field.val( place ).addClass( self.options.placeholderClass ).data( 'newVal', place );
// Mask the placeholder if needed
if ( self.options.maskInitial ) {
self.$field.keyup();
}
}
}
});
} else {
self.$field.keyup();
}
return self;
},
/**
* Remove placeholder functionality
* @private
*/
_changePlaceholder: function( isPlace ) {
if ( isPlace && !this.options.placeholder ) {
return this._bindPlaceholder();
} else if ( !isPlace && this.options.placeholder ) {
this.$field.focus().unbind('.password123').blur();
}
return this;
},
/**
* Change the id prefix on this field
* @private
*/
_changePrefix: function( value ) {
var cur = this.$field.attr("id"),
prev = this.options.prefix;
this.$field.attr( 'id', cur.replace( prev, value ) );
return this;
},
/**
* Gets the current cursor position in a textfield
* to determine where to delete/update a character.
* @return {Number} The index for the position of the cursor.
* @private
*/
_getCursorPosition: function() {
var elem = this.$field[0];
if ( elem != null ) {
// IE
if ( document.selection ) {
elem.focus();
var sel = document.selection.createRange();
sel.moveStart( 'character', -elem.value.length );
return sel.text.length;
}
// Others
else if ( elem.selectionStart !== undefined ) {
return elem.selectionStart;
}
}
return -1;
},
/**
* Sets the cursor position to a previous state
* if the field was updated somewhere in the middle.
* @param {Element} field The raw field.
* @param {Number} pos The position to set to.
* @private
*/
_setCursorPosition: function( pos ) {
var elem = this.$field[0];
if ( elem != null ) {
// IE
if ( elem.createTextRange ) {
var range = elem.createTextRange();
range.move('character', pos);
range.select();
}
// Others
else if ( elem.setSelectionRange ) {
elem.focus();
elem.setSelectionRange( pos, pos );
}
else {
elem.focus();
}
}
},
/**
* Internally sets options
* @return password123 instance
* @private
*/
_setOptions: function( options ) {
var self = this;
$.each( options, function( key, value ) {
switch ( key ) {
case "placeholder":
self._changePlaceholder( value === "false" ? false : value );
break;
case "prefix":
self._changePrefix( value );
}
self.options[ key ] = value;
});
return this;
},
/**
* Destroys everything password123 has done and
* sets the original password field back in place
* @return The original password field
*/
destroy: function( elem ) {
var val = this.$hidden.remove().val();
return this.$oldField.val( val ).replaceAll( elem );
},
/**
* Get/set option on an existing password123 instance
* @return The password123 field
*/
option: function( elems, key, value ) {
if ( !key ) {
return $.extend( {}, this.options ); // Avoids returning direct reference
}
var options = key;
if ( typeof key === "string" ) {
if ( value === undefined ) {
return this.options[ key ];
}
options = {};
options[ key ] = value;
}
this._setOptions( options );
return elems;
}
};
password123._init.prototype = password123;
// Textchange event with a little extra
$.event.special.textchange = {
setup: function( data, namespaces ) {
$(this).bind('keyup.textchange', $.event.special.textchange.handler);
$(this).bind('cut.textchange paste.textchange input.textchange', $.event.special.textchange.delayedHandler);
},
teardown: function( namespaces ) {
$(this).unbind('.textchange');
},
handler: function( event ) {
$.event.special.textchange.triggerIfChanged( $(this) );
},
delayedHandler: function( event ) {
var $element = $(this);
setTimeout(function() {
$.event.special.textchange.triggerIfChanged( $element );
}, 25);
},
triggerIfChanged: function( $element ) {
var v = $element.val();
if ( $element.val() !== $element.data('lastValue') ) {
// Check if something larger than one letter was pasted into the field
var p123 = $.data( $element[0], "password123" );
if ( v.length > 1 && v.indexOf( p123.encodedChar ) === -1 ) {
// If so, we need to save it before it disappears,
// but continue with triggering the field change
// by taking the last letter off
v = v.substr(0, v.length-1);
$element.data('value', v);
p123.$hidden.val( v );
}
$element.trigger( 'textchange', $element.data('lastValue') );
$element.data('lastValue', $element.val());
}
}
};
})(jQuery, this, this.document);
jsfiddle：http: //jsfiddle.net/pzeYZ/