JavaScript定时器 - 清除,设置新的,循环通过div

时间:2011-07-29 21:23:54

标签: jquery html jquery-selectors timer cycle

我有一些循环遍历n div标签的JavaScript,一次只显示一个,并且每10秒更改一次。这很有效。但我也有下一个和前一个按钮。当我点击下一个或上一个时,它们似乎正在跳过一个div。

有人可以帮忙吗?

有关更好的方法的任何建议也欢迎。我是jQuery的新手,所以我知道我还想做一些改进。感谢!!!

jQuery(document).ready(function () {
    var counter = 1;
    var delay = 3000; //10 seconds = 10000
    var lastItem = jQuery('table[id^=featuredNo]').length - 1;
    var previous = 0;
    var timerID;

    //argument is increment
    //false is decrement
    function updateCounter(increment) {
        if (increment) {
            counter = (counter >= lastItem) ? 0 : counter + 1;
            previous = (previous >= lastItem) ? 0 : previous + 1;
        } else {
            counter = (counter <= 0) ? lastItem : counter - 1;
            previous = (previous <= 0) ? lastItem : previous - 1;
        }
    }

    function displayNext() {
        //alert("testt" + counter);

        //hide everything but current
        jQuery("table[id^=featuredNo]").hide();
        jQuery("#featuredNo" + counter).show();

        //incrememnt the counter, so next time we show the next one
        updateCounter(true);
    };

    //set click handlers for previous
    jQuery('a[id^=featuredPrevious]').click(function () {
        clearInterval(timerID);

        updateCounter(false);

        displayNext();
        timerID = setInterval(displayNext, delay);
    });

    //set click handlers for next
    jQuery('a[id^=featuredNext]').click(function () {
        clearInterval(timerID);

        updateCounter(true);

        displayNext();
        timerID = setInterval(displayNext, delay);
    });


    //start interval
    timerID = setInterval(displayNext, delay);
});

1 个答案:

答案 0 :(得分:1)

最简单的解决方案从您的下一个按钮处理程序中删除updateCounter(true),并将另一个updateCounter(false)添加到您的prev按钮处理程序:

//set click handlers for previous
jQuery('a[id^=featuredPrevious]').click(function () {
    clearInterval(timerID);

    updateCounter(false);
    updateCounter(false);

    displayNext();
    timerID = setInterval(displayNext, delay);
});

//set click handlers for next
jQuery('a[id^=featuredNext]').click(function () {
    clearInterval(timerID);

    displayNext();
    timerID = setInterval(displayNext, delay);
});