How to make DOM manipulations without losing transition?

Question

Click on the button and the line starts to run, click again and it runs backwards. If YELLOW button is pushed I want yellow line to be on top of the black one. And if BLACK button is clicked then black line should be closer to the viewer. I !!!NEED TO USE APPEND!!! to move the paintings to the bottom of DOM to do it. However, in this case transition stops working properly. I tried setTimeout , requestAnimationFrame and getComputedStyle . No luck so far.

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

You can detect when animations end, and control the ordering in the DOM using jQuery

Here is an example using your pushYellow function:

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;
    }
}

Obviously, this only places the "yellow" line above the black when the animation is finished. Since you were trying to use setTimeout, I'm assuming this is fine.