滚动播放视频有问题吗? [英] Issue with play video once on scroll?

问题描述

如果滚动到达#user-experience部分，我将使用以下代码播放视频:

I use the following code to play a video if the section #user-experience is reached on scroll:

JS:

var player = $('video');

function isInView(elem){
    return $(elem).offset().top - $(window).scrollTop() < $(elem).height();
}

$(window).scroll(function() {

    if (isInView($('#user-experience'))) {
        // console.log('play video');
        player.get(0).play();
    }

});

HTML:

<video>
    <source src="images/browser.webm" type="video/webm">
    <source src="images/browser.mp4" type="video/mp4">
    Your browser does not support HTML5 video.
</video>

该代码的问题在于，每当用户滚动一点点，它将触发脚本，直到该部分在浏览器视口中不可见为止.如果用户滚动到#user-experience部分，则该代码仅应触发一次.滚动到另一部分并返回时，该视频不应第二次播放.

The problem with the code is that it will fire the script every time the user scrolls a little bit, until the section is not visible in the browser viewport. The code should only fire once if the user scrolled to the #user-experience section. When scroll to another section and back, the video should not play for the second time.

我该如何解决?

推荐答案

喜欢吗?

var player = $('video');
var hasReachedUserExperience = false;

function isInView(elem){
    return $(elem).offset().top - $(window).scrollTop() < $(elem).height();
}

$(window).scroll(function() {

    if (isInView($('#user-experience')) && !hasReachedUserExperience) {
        hasReachedUserExperience = true;
        player.get(0).play();
    }

});

一个简单的布尔标志似乎满足您的行为要求.

A simple boolean flag seems to meet your behavior requirements.

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