386 lines
14 KiB
JavaScript
386 lines
14 KiB
JavaScript
/**
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* jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
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* @requires jQuery v1.2 or above
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*
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* http://gmarwaha.com/jquery/jcarousellite/
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*
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* Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* Version: 1.0.1
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* Note: Requires jquery 1.2 or above from version 1.0.1
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*/
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/**
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* Creates a carousel-style navigation widget for images/any-content from a simple HTML markup.
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*
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* The HTML markup that is used to build the carousel can be as simple as...
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*
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* <div class="carousel">
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* <ul>
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* <li><img src="image/1.jpg" alt="1"></li>
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* <li><img src="image/2.jpg" alt="2"></li>
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* <li><img src="image/3.jpg" alt="3"></li>
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* </ul>
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* </div>
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*
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* As you can see, this snippet is nothing but a simple div containing an unordered list of images.
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* You don't need any special "class" attribute, or a special "css" file for this plugin.
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* I am using a class attribute just for the sake of explanation here.
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*
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* To navigate the elements of the carousel, you need some kind of navigation buttons.
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* For example, you will need a "previous" button to go backward, and a "next" button to go forward.
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* This need not be part of the carousel "div" itself. It can be any element in your page.
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* Lets assume that the following elements in your document can be used as next, and prev buttons...
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*
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* <button class="prev"><<</button>
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* <button class="next">>></button>
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*
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* Now, all you need to do is call the carousel component on the div element that represents it, and pass in the
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* navigation buttons as options.
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*
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev"
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* });
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*
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* That's it, you would have now converted your raw div, into a magnificient carousel.
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*
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* There are quite a few other options that you can use to customize it though.
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* Each will be explained with an example below.
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*
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* @param an options object - You can specify all the options shown below as an options object param.
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*
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* @option btnPrev, btnNext : string - no defaults
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev"
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* });
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* @desc Creates a basic carousel. Clicking "btnPrev" navigates backwards and "btnNext" navigates forward.
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*
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* @option btnGo - array - no defaults
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* btnGo: [".0", ".1", ".2"]
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* });
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* @desc If you don't want next and previous buttons for navigation, instead you prefer custom navigation based on
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* the item number within the carousel, you can use this option. Just supply an array of selectors for each element
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* in the carousel. The index of the array represents the index of the element. What i mean is, if the
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* first element in the array is ".0", it means that when the element represented by ".0" is clicked, the carousel
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* will slide to the first element and so on and so forth. This feature is very powerful. For example, i made a tabbed
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* interface out of it by making my navigation elements styled like tabs in css. As the carousel is capable of holding
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* any content, not just images, you can have a very simple tabbed navigation in minutes without using any other plugin.
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* The best part is that, the tab will "slide" based on the provided effect. :-)
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*
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* @option mouseWheel : boolean - default is false
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* @example
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* $(".carousel").jCarouselLite({
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* mouseWheel: true
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* });
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* @desc The carousel can also be navigated using the mouse wheel interface of a scroll mouse instead of using buttons.
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* To get this feature working, you have to do 2 things. First, you have to include the mouse-wheel plugin from brandon.
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* Second, you will have to set the option "mouseWheel" to true. That's it, now you will be able to navigate your carousel
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* using the mouse wheel. Using buttons and mouseWheel or not mutually exclusive. You can still have buttons for navigation
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* as well. They complement each other. To use both together, just supply the options required for both as shown below.
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* mouseWheel: true
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* });
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*
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* @option auto : number - default is null, meaning autoscroll is disabled by default
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* @example
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* $(".carousel").jCarouselLite({
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* auto: 800,
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* speed: 500
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* });
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* @desc You can make your carousel auto-navigate itself by specfying a millisecond value in this option.
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* The value you specify is the amount of time between 2 slides. The default is null, and that disables auto scrolling.
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* Specify this value and magically your carousel will start auto scrolling.
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*
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* @option speed : number - 200 is default
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* speed: 800
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* });
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* @desc Specifying a speed will slow-down or speed-up the sliding speed of your carousel. Try it out with
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* different speeds like 800, 600, 1500 etc. Providing 0, will remove the slide effect.
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*
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* @option easing : string - no easing effects by default.
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* easing: "bounceout"
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* });
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* @desc You can specify any easing effect. Note: You need easing plugin for that. Once specified,
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* the carousel will slide based on the provided easing effect.
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*
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* @option vertical : boolean - default is false
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* vertical: true
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* });
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* @desc Determines the direction of the carousel. true, means the carousel will display vertically. The next and
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* prev buttons will slide the items vertically as well. The default is false, which means that the carousel will
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* display horizontally. The next and prev items will slide the items from left-right in this case.
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*
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* @option circular : boolean - default is true
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* circular: false
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* });
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* @desc Setting it to true enables circular navigation. This means, if you click "next" after you reach the last
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* element, you will automatically slide to the first element and vice versa. If you set circular to false, then
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* if you click on the "next" button after you reach the last element, you will stay in the last element itself
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* and similarly for "previous" button and first element.
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*
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* @option visible : number - default is 3
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* visible: 4
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* });
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* @desc This specifies the number of items visible at all times within the carousel. The default is 3.
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* You are even free to experiment with real numbers. Eg: "3.5" will have 3 items fully visible and the
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* last item half visible. This gives you the effect of showing the user that there are more images to the right.
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*
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* @option start : number - default is 0
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* start: 2
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* });
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* @desc You can specify from which item the carousel should start. Remember, the first item in the carousel
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* has a start of 0, and so on.
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*
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* @option scrool : number - default is 1
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* scroll: 2
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* });
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* @desc The number of items that should scroll/slide when you click the next/prev navigation buttons. By
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* default, only one item is scrolled, but you may set it to any number. Eg: setting it to "2" will scroll
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* 2 items when you click the next or previous buttons.
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*
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* @option beforeStart, afterEnd : function - callbacks
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* @example
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* $(".carousel").jCarouselLite({
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* btnNext: ".next",
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* btnPrev: ".prev",
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* beforeStart: function(a) {
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* alert("Before animation starts:" + a);
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* },
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* afterEnd: function(a) {
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* alert("After animation ends:" + a);
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* }
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* });
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* @desc If you wanted to do some logic in your page before the slide starts and after the slide ends, you can
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* register these 2 callbacks. The functions will be passed an argument that represents an array of elements that
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* are visible at the time of callback.
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*
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*
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* @cat Plugins/Image Gallery
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* @author Ganeshji Marwaha/ganeshread@gmail.com
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*/
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(function($) { // Compliant with jquery.noConflict()
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$.fn.jCarouselLite = function(o) {
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o = $.extend({
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btnPrev: null,
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btnNext: null,
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btnGo: null,
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mouseWheel: false,
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auto: null,
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hoverPause: false,
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speed: 200,
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easing: null,
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vertical: false,
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circular: true,
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visible: 3,
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start: 0,
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scroll: 1,
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beforeStart: null,
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afterEnd: null
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}, o || {});
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return this.each(function() { // Returns the element collection. Chainable.
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var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
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var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
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if(o.circular) {
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ul.prepend(tLi.slice(tl-v+1).clone())
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.append(tLi.slice(0,o.scroll).clone());
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o.start += v-1;
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}
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var li = $("li", ul), itemLength = li.size(), curr = o.start;
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div.css("visibility", "visible");
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li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
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ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
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div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});
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var liSize = o.vertical ? height(li) : width(li);
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console.log("okkk")
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console.log(li)
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// Full li size(incl margin)-Used for animation
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var ulSize = liSize * itemLength; // size of full ul(total length, not just for the visible items)
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var divSize = liSize * v; // size of entire div(total length for just the visible items)
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li.css({width: li.width(), height: li.height()});
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ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));
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div.css(sizeCss, divSize+"px"); // Width of the DIV. length of visible images
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if(o.btnPrev) {
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$(o.btnPrev).click(function() {
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return go(curr-o.scroll);
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});
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if(o.hoverPause) {
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$(o.btnPrev).hover(function(){stopAuto();}, function(){startAuto();});
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}
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}
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if(o.btnNext) {
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$(o.btnNext).click(function() {
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return go(curr+o.scroll);
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});
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if(o.hoverPause) {
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$(o.btnNext).hover(function(){stopAuto();}, function(){startAuto();});
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}
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}
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if(o.btnGo)
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$.each(o.btnGo, function(i, val) {
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$(val).click(function() {
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return go(o.circular ? o.visible+i : i);
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});
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});
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if(o.mouseWheel && div.mousewheel)
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div.mousewheel(function(e, d) {
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return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
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});
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var autoInterval;
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function startAuto() {
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stopAuto();
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autoInterval = setInterval(function() {
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go(curr+o.scroll);
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}, o.auto+o.speed);
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};
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function stopAuto() {
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clearInterval(autoInterval);
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};
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if(o.auto) {
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if(o.hoverPause) {
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div.hover(function(){stopAuto();}, function(){startAuto();});
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}
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startAuto();
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};
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function vis() {
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return li.slice(curr).slice(0,v);
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};
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function go(to) {
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if(!running) {
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if(o.beforeStart)
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o.beforeStart.call(this, vis());
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if(o.circular) { // If circular we are in first or last, then goto the other end
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if(to<0) { // If before range, then go around
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ul.css(animCss, -( (curr + tl) * liSize)+"px");
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curr = to + tl;
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} else if(to>itemLength-v) { // If beyond range, then come around
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ul.css(animCss, -( (curr - tl) * liSize ) + "px" );
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curr = to - tl;
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} else curr = to;
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} else { // If non-circular and to points to first or last, we just return.
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if(to<0 || to>itemLength-v) return;
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else curr = to;
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} // If neither overrides it, the curr will still be "to" and we can proceed.
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running = true;
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ul.animate(
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animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing,
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function() {
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if(o.afterEnd)
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o.afterEnd.call(this, vis());
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running = false;
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}
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);
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// Disable buttons when the carousel reaches the last/first, and enable when not
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if(!o.circular) {
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$(o.btnPrev + "," + o.btnNext).removeClass("disabled");
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$( (curr-o.scroll<0 && o.btnPrev)
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(curr+o.scroll > itemLength-v && o.btnNext)
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[]
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).addClass("disabled");
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}
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}
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return false;
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};
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});
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};
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function css(el, prop) {
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return parseInt($.css(el[0], prop)) || 0;
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};
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function width(el) {
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return el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
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};
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function height(el) {
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// 检查 el 是否包含有效元素
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if (el.length === 0 || !el[0]) {
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console.error("元素未找到！");
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return 100; // 返回自定义的默认值（例如：100px）
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}
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// 获取元素的高度
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let element = el[0];
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// 获取元素的外边距
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let computedStyle = window.getComputedStyle(element);
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let marginTop = parseFloat(computedStyle.marginTop);
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let marginBottom = parseFloat(computedStyle.marginBottom);
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// 返回总高度
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return element.offsetHeight + marginTop + marginBottom;
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}
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})(jQuery);
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