我需要为图像网格制作上一个和下一个按钮
$prev=$( '<input id="prev" type="button" value="prev" onclick="prev();" />' );
我试图在变量中调用一个函数
var Grid = (function() {
...
function prevItemsEvents( $items ) {
...
但我似乎无法让它工作
function prev() {$(function(){Grid.prevItemsEvents();})};
我收到此错误
TypeError： Grid.prevItemsEvents 不是函数
感谢输入
整个代码
/*
* debouncedresize: special jQuery event that happens once after a window resize
*
* latest version and complete README available on Github:
* https://github.com/louisremi/jquery-smartresize/blob/master/jquery.debouncedresize.js
*
* Copyright 2011 @louis_remi
* Licensed under the MIT license.
*/
var $event = $.event,
$special,
resizeTimeout;
$special = $event.special.debouncedresize = {
setup: function() {
$( this ).on( "resize", $special.handler );
},
teardown: function() {
$( this ).off( "resize", $special.handler );
},
handler: function( event, execAsap ) {
// Save the context
var context = this,
args = arguments,
dispatch = function() {
// set correct event type
event.type = "debouncedresize";
$event.dispatch.apply( context, args );
};
if ( resizeTimeout ) {
clearTimeout( resizeTimeout );
}
execAsap ?
dispatch() :
resizeTimeout = setTimeout( dispatch, $special.threshold );
},
threshold: 250
};
// ======================= imagesLoaded Plugin ===============================
// https://github.com/desandro/imagesloaded
// $('#my-container').imagesLoaded(myFunction)
// execute a callback when all images have loaded.
// needed because .load() doesn't work on cached images
// callback function gets image collection as argument
// this is the container
// original: MIT license. Paul Irish. 2010.
// contributors: Oren Solomianik, David DeSandro, Yiannis Chatzikonstantinou
// blank image data-uri bypasses webkit log warning (thx doug jones)
var BLANK = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
$.fn.imagesLoaded = function( callback ) {
var $this = this,
deferred = $.isFunction($.Deferred) ? $.Deferred() : 0,
hasNotify = $.isFunction(deferred.notify),
$images = $this.find('img').add( $this.filter('img') ),
loaded = [],
proper = [],
broken = [];
// Register deferred callbacks
if ($.isPlainObject(callback)) {
$.each(callback, function (key, value) {
if (key === 'callback') {
callback = value;
} else if (deferred) {
deferred[key](value);
}
});
}
function doneLoading() {
var $proper = $(proper),
$broken = $(broken);
if ( deferred ) {
if ( broken.length ) {
deferred.reject( $images, $proper, $broken );
} else {
deferred.resolve( $images );
}
}
if ( $.isFunction( callback ) ) {
callback.call( $this, $images, $proper, $broken );
}
}
function imgLoaded( img, isBroken ) {
// don't proceed if BLANK image, or image is already loaded
if ( img.src === BLANK || $.inArray( img, loaded ) !== -1 ) {
return;
}
// store element in loaded images array
loaded.push( img );
// keep track of broken and properly loaded images
if ( isBroken ) {
broken.push( img );
} else {
proper.push( img );
}
// cache image and its state for future calls
$.data( img, 'imagesLoaded', { isBroken: isBroken, src: img.src } );
// trigger deferred progress method if present
if ( hasNotify ) {
deferred.notifyWith( $(img), [ isBroken, $images, $(proper), $(broken) ] );
}
// call doneLoading and clean listeners if all images are loaded
if ( $images.length === loaded.length ){
setTimeout( doneLoading );
$images.unbind( '.imagesLoaded' );
}
}
// if no images, trigger immediately
if ( !$images.length ) {
doneLoading();
} else {
$images.bind( 'load.imagesLoaded error.imagesLoaded', function( event ){
// trigger imgLoaded
imgLoaded( event.target, event.type === 'error' );
}).each( function( i, el ) {
var src = el.src;
// find out if this image has been already checked for status
// if it was, and src has not changed, call imgLoaded on it
var cached = $.data( el, 'imagesLoaded' );
if ( cached && cached.src === src ) {
imgLoaded( el, cached.isBroken );
return;
}
// if complete is true and browser supports natural sizes, try
// to check for image status manually
if ( el.complete && el.naturalWidth !== undefined ) {
imgLoaded( el, el.naturalWidth === 0 || el.naturalHeight === 0 );
return;
}
// cached images don't fire load sometimes, so we reset src, but only when
// dealing with IE, or image is complete (loaded) and failed manual check
// webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f
if ( el.readyState || el.complete ) {
el.src = BLANK;
el.src = src;
}
});
}
return deferred ? deferred.promise( $this ) : $this;
};
var Grid = (function() {
// list of items
var $grid = $( '#og-grid' ),
// the items
$items = $grid.children( 'li' ),
// current expanded item's index
current = -1,
// position (top) of the expanded item
// used to know if the preview will expand in a different row
previewPos = -1,
// extra amount of pixels to scroll the window
scrollExtra = 0,
// extra margin when expanded (between preview overlay and the next items)
marginExpanded = 10,
$window = $( window ), winsize,
$body = $( 'html, body' ),
// transitionend events
transEndEventNames = {
'WebkitTransition' : 'webkitTransitionEnd',
'MozTransition' : 'transitionend',
'OTransition' : 'oTransitionEnd',
'msTransition' : 'MSTransitionEnd',
'transition' : 'transitionend'
},
transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
// support for csstransitions
support = Modernizr.csstransitions,
// default settings
settings = {
minHeight : 500,
speed : 350,
easing : 'ease'
};
function init( config ) {
// the settings..
settings = $.extend( true, {}, settings, config );
// preload all images
$grid.imagesLoaded( function() {
// save item´s size and offset
saveItemInfo( true );
// get window´s size
getWinSize();
// initialize some events
initEvents();
} );
}
// add more items to the grid.
// the new items need to appended to the grid.
// after that call Grid.addItems(theItems);
function addItems( $newitems ) {
$items = $items.add( $newitems );
$newitems.each( function() {
var $item = $( this );
$item.data( {
offsetTop : $item.offset().top,
height : $item.height()
} );
} );
initItemsEvents( $newitems );
}
// saves the item´s offset top and height (if saveheight is true)
function saveItemInfo( saveheight ) {
$items.each( function() {
var $item = $( this );
$item.data( 'offsetTop', $item.offset().top );
if( saveheight ) {
$item.data( 'height', $item.height() );
}
} );
}
function initEvents() {
// when clicking an item, show the preview with the item´s info and large image.
// close the item if already expanded.
// also close if clicking on the item´s cross
initItemsEvents( $items );
// on window resize get the window´s size again
// reset some values..
$window.on( 'debouncedresize', function() {
scrollExtra = 0;
previewPos = -1;
// save item´s offset
saveItemInfo();
getWinSize();
var preview = $.data( this, 'preview' );
if( typeof preview != 'undefined' ) {
hidePreview();
}
} );
}
function initItemsEvents( $items ) {
$items.on( 'click', 'span.og-close', function() {
hidePreview();
return false;
} ).children( 'a' ).on( 'click', function(e) {
var $item = $( this ).parent();
// check if item already opened
current === $item.index() ? hidePreview() : showPreview( $item );
return false;
} );
}
function nextItemsEvents( $items ) {
$items.on( 'click', 'span.og-close', function() {
hidePreview();
return false;
} ).children( 'a' ).on( 'click', function(e) {
var $item = $( this ).parent().next();
showPreview( $item );
return false;
} );
}
function prevItemsEvents( $items ) {
$items.on( 'click', 'span.og-close', function() {
hidePreview();
return false;
} ).children( 'a' ).on( 'click', function(e) {
var $item = $( this ).parent().prev();
showPreview( $item );
return false;
} );
}
function getWinSize() {
winsize = { width : $window.width(), height : $window.height() };
}
function showPreview( $item ) {
var preview = $.data( this, 'preview' ),
// item´s offset top
position = $item.data( 'offsetTop' );
scrollExtra = 0;
// if a preview exists and previewPos is different (different row) from item´s top then close it
if( typeof preview != 'undefined' ) {
// not in the same row
if( previewPos !== position ) {
// if position > previewPos then we need to take te current preview´s height in consideration when scrolling the window
if( position > previewPos ) {
scrollExtra = preview.height;
}
hidePreview();
}
// same row
else {
preview.update( $item );
return false;
}
}
// update previewPos
previewPos = position;
// initialize new preview for the clicked item
preview = $.data( this, 'preview', new Preview( $item ) );
// expand preview overlay
preview.open();
}
function hidePreview() {
current = -1;
var preview = $.data( this, 'preview' );
preview.close();
$.removeData( this, 'preview' );
}
// the preview obj / overlay
function Preview( $item ) {
this.$item = $item;
this.expandedIdx = this.$item.index();
this.create();
this.update();
}
Preview.prototype = {
create : function() {
// create Preview structure:
this.$title = $( '<h3></h3>' );
this.$description = $( '<p></p>' );
this.$href = $( '<a href="#">Visit website</a>' );
$next=$( '<input id="next" type="button" value="next" onclick="next();" />' );
$prev=$( '<input id="prev" type="button" value="prev" onclick="prev();" />' );
this.$details = $( '<div class="og-details"></div>' ).append( this.$title, this.$description, $prev, $next);
this.$loading = $( '<div class="og-loading"></div>' );
this.$fullimage = $( '<div class="og-fullimg"></div>' ).append( this.$loading );
this.$closePreview = $( '<span class="og-close"></span>' );
this.$previewInner = $( '<div class="og-expander-inner"></div>' ).append( this.$closePreview, this.$fullimage, this.$details );
this.$previewEl = $( '<div class="og-expander"></div>' ).append( this.$previewInner );
// append preview element to the item
this.$item.append( this.getEl() );
// set the transitions for the preview and the item
if( support ) {
this.setTransition();
}
},
update : function( $item ) {
if( $item ) {
this.$item = $item;
}
// if already expanded remove class "og-expanded" from current item and add it to new item
if( current !== -1 ) {
var $currentItem = $items.eq( current );
$currentItem.removeClass( 'og-expanded' );
this.$item.addClass( 'og-expanded' );
// position the preview correctly
this.positionPreview();
}
// update current value
current = this.$item.index();
// update preview´s content
var $itemEl = this.$item.children( 'a' ),
eldata = {
href : $itemEl.attr( 'href' ),
largesrc : $itemEl.data( 'largesrc' ),
title : $itemEl.data( 'title' ),
description : $itemEl.data( 'description' )
};
this.$title.html( eldata.title );
this.$description.html( eldata.description );
this.$href.attr( 'href', eldata.href );
var self = this;
// remove the current image in the preview
if( typeof self.$largeImg != 'undefined' ) {
self.$largeImg.remove();
}
// preload large image and add it to the preview
// for smaller screens we don´t display the large image (the media query will hide the fullimage wrapper)
if( self.$fullimage.is( ':visible' ) ) {
this.$loading.show();
$( '<img/>' ).load( function() {
var $img = $( this );
if( $img.attr( 'src' ) === self.$item.children('a').data( 'largesrc' ) ) {
self.$loading.hide();
self.$fullimage.find( 'img' ).remove();
self.$largeImg = $img.fadeIn( 350 );
self.$fullimage.append( self.$largeImg );
}
} ).attr( 'src', eldata.largesrc );
}
},
open : function() {
setTimeout( $.proxy( function() {
// set the height for the preview and the item
this.setHeights();
// scroll to position the preview in the right place --- pieterm removed autoscroll
//this.positionPreview();
}, this ), 25 );
},
close : function() {
var self = this,
onEndFn = function() {
if( support ) {
$( this ).off( transEndEventName );
}
self.$item.removeClass( 'og-expanded' );
self.$previewEl.remove();
};
setTimeout( $.proxy( function() {
if( typeof this.$largeImg !== 'undefined' ) {
this.$largeImg.fadeOut( 'fast' );
}
this.$previewEl.css( 'height', 0 );
// the current expanded item (might be different from this.$item)
var $expandedItem = $items.eq( this.expandedIdx );
$expandedItem.css( 'height', $expandedItem.data( 'height' ) ).on( transEndEventName, onEndFn );
if( !support ) {
onEndFn.call();
}
}, this ), 25 );
return false;
},
calcHeight : function() {
var heightPreview = winsize.height - this.$item.data( 'height' ) - marginExpanded,
itemHeight = winsize.height;
if( heightPreview < settings.minHeight ) {
heightPreview = settings.minHeight;
itemHeight = settings.minHeight + this.$item.data( 'height' ) + marginExpanded;
}
this.height = heightPreview;
this.itemHeight = itemHeight;
},
setHeights : function() {
var self = this,
onEndFn = function() {
if( support ) {
self.$item.off( transEndEventName );
}
self.$item.addClass( 'og-expanded' );
};
this.calcHeight();
this.$previewEl.css( 'height', this.height );
this.$item.css( 'height', this.itemHeight ).on( transEndEventName, onEndFn );
if( !support ) {
onEndFn.call();
}
},
positionPreview : function() {
// scroll page
// case 1 : preview height + item height fits in window´s height
// case 2 : preview height + item height does not fit in window´s height and preview height is smaller than window´s height
// case 3 : preview height + item height does not fit in window´s height and preview height is bigger than window´s height
var position = this.$item.data( 'offsetTop' ),
previewOffsetT = this.$previewEl.offset().top - scrollExtra,
scrollVal = this.height + this.$item.data( 'height' ) + marginExpanded <= winsize.height ? position : this.height < winsize.height ? previewOffsetT - ( winsize.height - this.height ) : previewOffsetT;
$body.animate( { scrollTop : scrollVal }, settings.speed );
},
setTransition : function() {
this.$previewEl.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing );
this.$item.css( 'transition', 'height ' + settings.speed + 'ms ' + settings.easing );
},
getEl : function() {
return this.$previewEl;
}
}
return {
init : init,
addItems : addItems
};
})();
function prev() {$(function(){Grid.prevItemsEvents();})};
function next() {$(function(){Grid.nextItemsEvents();})};
.html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="js/grid.js"></script>
<script src="js/jquery.lazy.min.js" type="text/javascript"></script>
<script>$(function() {Grid.init();});</script>
<script type="text/javascript">jQuery(document).ready(function() { jQuery(".lazy").lazy(); });</script>
你应该做这样的事情
var Grid = (function () {
return {
prevItemsEvents: function ($items) {
//code goes here
}
}
})();
演示
您的Grid对象是
return {
init : init,
addItems : addItems
};
因此，您只能从Grid拨打电话。如果你想调用类似Grid.prevItemsEvents()的东西，你必须在这个对象中添加这个函数，比如
return {
init : init,
addItems : addItems,
prevItemsEvents : prevItemsEvents
};
在函数中声明的所有函数都是私有的，所以如果你需要添加其他东西，你只需要在返回的对象中添加对它的引用