如何在不丢失过渡的情况下进行 DOM 操作

Question

>单击按钮，该行开始运行，再次单击，它向后运行。如果按下黄色按钮，我希望黄线位于黑线的顶部。如果单击黑色按钮，则黑线应该更接近查看器。我!!需要使用附录!!将绘画移动到 DOM 的底部来做到这一点。但是，在这种情况下，转换将停止正常工作。我试过setTimeout，请求动画帧和getComputedStyle.到目前为止没有运气。

var black = 33000,
yellow = 20000;
function pushBlack() {
document.getElementById('canv').appendChild(document.getElementById('pollBlack'));
    if(black > 0) {
        black = black - 33000;
        document.getElementById('pollBlack').style.strokeDashoffset = black;
    } 
    else {
        black = black + 33000;
        document.getElementById('pollBlack').style.strokeDashoffset = black;
}
}
function pushYellow() {
    if(yellow > 0) {
        yellow = yellow - 20000;
        document.getElementById('pollYellow').style.strokeDashoffset = yellow;
}
else {
    yellow = yellow + 20000;
    document.getElementById('pollYellow').style.strokeDashoffset = yellow;
}
}

#pollBlack {
    stroke-dasharray: 33000;
    stroke-dashoffset: 33000;
    transition: 5s linear;
}
#pollYellow {
    stroke-dasharray: 20000;
    stroke-dashoffset: 20000;
    transition: 5s linear;
}

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</svg><br>
<button onclick="pushBlack()" id="butBlack">BLACK</button>
<button onclick="pushYellow()" id="butYellow">YELLOW</button>

Answer 1

你可以检测动画何时结束，并使用jQuery控制DOM中的顺序

下面是一个使用 pushYellow 函数的示例：

function pushYellow() {
    if(yellow > 0) {
        yellow = yellow - 20000;
        this_stroke = document.getElementById('pollYellow');
        this_stroke.style.strokeDashoffset = yellow;
        // WAIT FOR ANIMATION TO END, THEN CALLBACK
        $('#pollYellow').on('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend',   
        function(e) {
            // INSERT YELLOW LINE AFTER BLACK
            $('#pollYellow').insertAfter($('#pollBlack').get(0))
        });
        }
    else {
    yellow = yellow + 20000;
    document.getElementById('pollYellow').style.strokeDashoffset = yellow;
    }
}

显然，这只会在动画完成后将"黄色"线放在黑色上方。由于您尝试使用 setTimeout，我假设这很好。