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我是 jQuery 和堆栈溢出的新手,所以我会尽量具体一点,但请多多包涵。我正在尝试从头开始创建一个带有关联链接的文本滑块,使用模数来遍历列表并重复。

这是我正在使用的代码:

ul#text { position: relative; margin-bottom: 40px; height: 40px; }
ul#text li { position: absolute; display: none; }
.active { font-weight: bold; }
<ul id="text">
<li id="textBody">Suffering is not a result of physical pain alone. It can be compounded by changes in one's life, and changes in the self. <em>We understand, and we can help.</em></li>
<li id="textFamily">Aggressive assessment of physical symptoms &amp; pain in the body are key to support <em>the best possible quality of life</em>.</li>
<li id="textFunction">Chronic pain &amp; illness may affect your role in your family. We work with you and your family as you confront those changes.</li>
<li id="textPsyche">Chronic pain and illness make even everyday activities challenging. We will help you maintain independence and physical function.</li>
<li id="textSuffering">Changes in the physical body mean changes in the self. We will provide support as you navigate those changes in the psyche.</li>
</ul>
<ul id="vivid_buttons">
<li><a href="#" id="buttonBody">BODY</a></li>
<li><a href="#" id="buttonFamily" class="active">FAMILY</a></li>
<li><a href="#" id="buttonFunction">FUNCTION</a></li>
<li><a href="#" id="buttonPsyche">PSYCHE</a></li>
<li><a href="#" id="buttonSuffering">SUFFERING</a></li>
</ul>
$(document).ready(function () {

    function fadeAndMove() {
        var nextLi = $("#text > li:nth-child(" + i % 5 + ")");
        var nextA = $("#vivid_buttons > li:nth-child(" + i % 5 + ") > a");
        nextLi.fadeIn(1000, function () {
            $("#vivid_buttons > li > a").removeClass("active");
            nextA.addClass("active");
            setTimeout(function () {
                nextLi.fadeOut(1000);
            }, 4000);
        });
    }

    for (i = 1; i < 7; i++) {
        fadeAndMove($("#text"));
    }
});

用简单的语言,我想从第一个列表中淡入一个句子,并突出显示底部列表中的相应链接。然后我希望它淡出并移至下一个项目。

我以为我可以使用模数 (%) 和 for 循环来迭代并创建一个无限循环,但是当我把它放进去时,它就像它一次执行所有东西,而不是迭代(淡入和淡出)每个项目。

我知道这很令人困惑,但如果我能得到任何帮助,我将不胜感激。

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3 回答 3

3

摆脱for循环,只需让 setTimeout 调用该fadeAndMove()函数,传递当前索引。

示例:http: //jsfiddle.net/drWhE/

$(document).ready(function () {

       // cache the LI elements
    var $lis = $("#text > li");
    var $aLis = $("#vivid_buttons > li");

    function fadeAndMove( currentIndex ) {
        var nextIndex = (currentIndex + 1) % 5;
        var nextLi = $lis.eq( nextIndex );
        nextLi.fadeIn(1000, function () {
            $aLis.eq( currentIndex ).children('a').removeClass("active");
            $aLis.eq( nextIndex ).children('a').addClass("active");
            setTimeout(function () {
                nextLi.fadeOut(1000, function() {
                      // Call fadeAndMove() passing nextIndex as the new currentIndex
                    fadeAndMove( nextIndex );
                });
            }, 4000);
        });
    }
       // Get it started on index 0
    fadeAndMove( 0 );
});
于 2010-10-08T20:08:53.620 回答
0

因为你的主循环一直在运行,而你的淡出计时器等待四秒钟,所以一切都立即动画化。

从示意图上看,它是这样的(每行代表一秒):

li1.fadeIn
li2.fadeIn  |
li3.fadeIn  | |
li4.fadeIn  | | |      Timers
li5.fadeIn  V | | |    wait four
li1.fadeOut   V | | |  seconds
li2.fadeOut     V | |
li3.fadeOut       V |
li4.fadeOut         V
li5.fadeOut
li1.fadeIn
li2.fadeIn
.
.
.
etc, etc, ad nauseam.

fadeAndMove()为了解决这个问题,你需要在你的延迟函数中淡出当前项目之后将下一个调用链接到右边:

nextLi.fadeIn(1000, function () {
    $("#vivid_buttons > li > a").removeClass("active");
    nextA.addClass("active");
    setTimeout(function () {
        nextLi.fadeOut(1000);
        fadeAndMove(i + 1);
    }, 4000);
});

(由于这是一个延迟调用,它不是递归的。无限循环不会破坏堆栈。)

于 2010-10-08T20:12:29.500 回答
0

这是获取所需内容的一种方法:

var $sentence_set = $('ul#text > li');
var $link_set = $('ul#vivid_buttons > li');

var highlight = function(which) {
  var el = $sentence_set.eq(which - 1);
  var position = el.prevAll('li').length;
  $link_set.removeClass('active').eq(position).addClass('active');
  $sentence_set.eq(position).siblings().fadeOut().end().fadeIn();
}

var loopcount = 0;
var repeater = setInterval(function() {
  var theList = $('#text > li');
  highlight(++loopcount % $sentence_set.length);
}, 4000);​

这是小提琴

而且...橙色条告诉我 patrick dw 击败了我类似的东西。好吧,无论如何它都在这里。

于 2010-10-08T20:44:48.617 回答