淡入元素使用css向下滚动 [英] Fade in element on scroll down using css

问题描述

示例： http://www.chartjs.org/

Example: http://www.chartjs.org/

当向下滚动每个文章时，它出现在浏览器的视口中。 css是

When scrolling down each article shows up when it gets in the view-port of the browser. The css is

#examples article {
    -webkit-transition: opacity 200ms ease-in-out;
    -ms-transition: opacity 200ms ease-in-out;
    -moz-transition: opacity 200ms ease-in-out;
    -o-transition: opacity 200ms ease-in-out;
    transition: opacity 200ms ease-in-out;
    position: relative;
    margin-top: 20px;
    clear: both;
}

我试过这个CSS，但它不工作。有一些javascript与css一起工作吗？如何实现这种scroll-> fadeIn效果？

I tried this css but it does not work. Is there some javascript that works together with the css? How can I achieve this kind of scroll->fadeIn effect?

推荐答案

小提琴

你想要这样的东西吗？ / p>

Do you want something like this ?

   $(window).scroll(function () {

        /* Check the location of each desired element */
        $('.article').each(function (i) {

            var bottom_of_object = $(this).position().top + $(this).outerHeight();
            var bottom_of_window = $(window).scrollTop() + $(window).height();

            /* If the object is completely visible in the window, fade it it */
            if (bottom_of_window > bottom_of_object) {

                $(this).animate({
                    'opacity': '1'
                }, 500);

            }

        });

    });

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