在浏览器上使用ScaleX（）缩放问题

问题描述 投票：0回答：1

在浏览器中放大时，scaleX（）属性不一致。 TranslateX（）完全可以正常工作，这就是为什么我要伸出援手。

我正在使用Web Animations API和Vanilla JS构建逐步进度条，目的是在其中插入一个表单，以便我们逐步执行动画时，动画将显示进度。我遇到的问题是在测试ADA遵从性时，尤其是放大页面时。更具体地说，只有当缩放百分比不是100的倍数时，所以100、200、300和400％才能完美工作。但是仅举几例，其中110％，125％，250％出现了问题。在屏幕上滑动的点应正常工作。

意外行为出现在沿着点在屏幕上扩展的栏中，有时它走得太远，有时还远远不够。真正让我感到困惑的是，条形图和点都被相同的度量“控制”，即采用父div的宽度并将其除以3，然后乘以当前步长。这就是导致我假设问题出在scaleX转换中的原因。我仍然在IE中对此进行总体测试，但在chrome和firefox中遇到了问题。

HTML：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>My stepped progress bar</title>
    <link href="style.css" type="text/css" rel="stylesheet" />
    <link href="fonts.css" type="text/css" rel="stylesheet" />
    <!-- Web Animation API polyfill-->
    <script src="https://rawgit.com/web-animations/web-animations-js/master/web-animations.min.js"></script>
</head>
<body>
    <section>
        <div class="progress__container">

                <div class="progress__bar">
                        <div id="progress__fill" class="step1"></div>
                        <div class="circ__container">
                            <div class="circ" id="circ__1"></div>
                            <div class="circ" id="circ__2"></div>
                            <div class="circ" id="circ__3"></div>
                            <div class="circ" id="circ__4"></div>
                        </div>




                        <div id="progress__dot" class="prog__1"></div>
                    </div>
            <div class="backBar"></div>
            <div class="flexrow">

                    <span class="stepName tab-1">Account</span>
                    <span class="stepName tab-2">Frequency</span>
                    <span class="stepName tab-3">Amount</span>
                    <span class="stepName tab-4">Taxes</span>
                </div>
            <div class="button__container">
                <button class="buttonStep" id="back">Back</button>
                <button class="buttonStep is-active" id="next">Next</button>
            </div>
    </div>

    </section>
<script src="script-api.js"></script>
</body>
</html>

CSS：

/* General Styles */
body {
    font-family: Arial, helvetica, sans-serif;
}



/* Slider Bar Animation */
#progress__fill {
    height:2px;
    position: absolute;
    top: 7px;
    left: 0;
    background-color: darkred;
    width: 1px;
}
#progress__dot {
    background-color: darkred;
    color: #fff;
    border-radius: 50%;
    height: 8px;
    width: 8px;
    position: absolute;
    text-align:center;
    line-height: 8px;
    padding: 6px;
    top: 0;
    font-size: 12px;


}





/* Static Bar Elements */
.progress__container {
 width: 600px;
 margin: 20px auto;
 position: relative;

}
.backBar {
    height:2px;
    width:96%;
    position: absolute;
    top: 7px;
    left: 2%;
    background-color: lightgrey;
}
.progress__bar {
    z-index: 100;
    position: relative;
    width: 96%;
    margin: 0 auto;
}
.circ {
    background-color: #fff;
    border: 2px solid lightgrey;
    border-radius: 50%;
    height: 8px;
    width: 8px;
    display: inline-block;
    position: absolute;

}

.hide {
    visibility: hidden
}
.flexrow {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}
.circ__container {
    padding-top: 3px;
}
.flexrow {
    margin-top: 20px;
}
.stepName {
    font-size: 12px;
    text-align: center;
}
.stepName:first-child {
    text-align: left;
}
.stepName:last-child {
    text-align: right;
}
.stepName.bold {
    font-weight: 600;
}


/* Buttons */
.button__container {
    padding-top: 100px;
}
.buttonStep {
    background: grey;
    color: #fff;
    padding: 10px 25px;
    border-radius: 10px;
    font-size: 16px;
}
#back {
    float: left;
}
#next {
    float: right;
}
.is-active {
    background: darkred;
}

JS：

// give a starting value for the transformation
var slideBarWidth = 0,
    slideBarScalePoint = 0,
    currentStep = 1,
    dot = document.getElementById('progress__dot'),
    boxWidth = dot.parentElement.offsetWidth;

// insert the current step number into the progress dot
dot.innerHTML = currentStep;

// place the background dots on the bar
for (var x = 1; x < 5; x++) {
    document.getElementById('circ__' + x).setAttribute('style', 'left: ' + ((boxWidth / 3) * (x - 1)) + 'px');
    if (x == 4) {
        document.getElementById('circ__' + x).setAttribute('style', 'left: ' + (((boxWidth / 3) * (x - 1)) - document.getElementById('circ__' + x).offsetWidth)+ 'px');
    }
}

// define the timing for progress dot
var dotTiming = {
  duration: 500,
  fill: "both",
  easing: 'ease-in-out'
}
// define the timing for sliding bar
var barTiming = {
    duration: 500,
    fill: "both",
    easing: 'ease-in-out'
  }
  var passedTiming = {
      fill: "both"
  }

// make the first step name bold
document.getElementsByClassName('tab-' + currentStep)[0].classList.add('bold');





// on click fire the animation
document.getElementById('next').addEventListener('click', function() {
    // make sure the slider does not go further than it should
    if (currentStep > 3){return;}



    // define the keyframes for the progress dot
    if (currentStep == 3) {

        var moveDot = [  
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep - 1)) +  'px)'},
            {transform: 'translateX(' + (((boxWidth / 3) * (currentStep)) - dot.offsetWidth) + 'px)'}

        ];
    } else {
        var moveDot = [
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep - 1)) +  'px)'},
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep)) +  'px)'},

        ];
    }


    // define the keyframes for the sliding bar
    var slideBar = [
        {
            transform: 'scaleX(' + ((boxWidth / 3) * (currentStep - 1)) + ')',
            transformOrigin: 'left'
        },
        {
            transform: 'scaleX(' + ((boxWidth / 3) * (currentStep)) + ')',
            transformOrigin: 'left'
        }

    ];
    var showDot = [
        {backgroundColor: '#fff', border: '2px solid lightgrey' },
        {backgroundColor: 'darkred', border: '2px solid darkred' }
    ];




    // putting the keyframes and timings together (progress dot)
    var movingDot = document.getElementById("progress__dot").animate(
    moveDot,
    dotTiming
    );

    // putting the keyframes and timings together (sliding bar)
    var slidingBar = document.getElementById("progress__fill").animate(
        slideBar,
        barTiming
        );
    var passingDot = document.getElementById('circ__' + currentStep).animate(
            showDot,
            passedTiming
        );



    // making the animation play forwards 
    movingDot.playbackRate = 1;
    slidingBar.playbackRate = 1;
    passingDot.playbackRate = 1;

    // starting the animations
    movingDot.play();
    slidingBar.play();
    movingDot.onfinish = passingDot;

    // incrementing and setting the step counter
    currentStep++;
    document.getElementById("progress__dot").innerHTML = currentStep;

    if (currentStep > 1) {
        document.getElementById('back').classList.add('is-active');
    }
    if (currentStep > 3) {
        document.getElementById('next').classList.remove('is-active');
    }

    // toggling the bold class for the step names
    document.getElementsByClassName('tab-' + (currentStep - 1))[0].classList.remove('bold');

    setTimeout(() =>
        {
            document.getElementsByClassName('tab-' + currentStep)[0].classList.add('bold');
        }, 600);
});


document.getElementById('back').addEventListener('click', function() {
    // make sure the slider does not go back past the beginning
    if (currentStep < 2){return;}

    // define the keyframes
    if (currentStep == 4) {
        var moveDot = [
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep - 2)) + 'px)'},
            {transform: 'translateX(' + (((boxWidth / 3) * (currentStep - 1)) - dot.offsetWidth) + 'px)'}

        ];
    } else {
        var moveDot = [
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep - 2)) + 'px)'},
            {transform: 'translateX(' + ((boxWidth / 3) * (currentStep - 1)) + 'px)'}

        ];
    }

    var slideBar = [
        {
            transform: 'scaleX(' + ((boxWidth / 3) * (currentStep - 2)) + ')',
            transformOrigin: 'left'
        },
        {
            transform: 'scaleX(' + ((boxWidth / 3) * (currentStep -1 )) + ')',
            transformOrigin: 'left'
        }

    ];
    var showDot = [
        {backgroundColor: 'darkred', border: '2px solid darkred' },
        {backgroundColor: '#fff', border: '2px solid lightgrey' }    
    ];


    // putting the keyframes and timings together
    var movingDot = document.getElementById("progress__dot").animate(
        moveDot,
        dotTiming
    );

    var slidingBar = document.getElementById("progress__fill").animate(
        slideBar,
        barTiming
        );

        var passingDot = document.getElementById('circ__' + currentStep).animate(
            showDot,
            passedTiming
        );


    // making the animation reverse
    movingDot.playbackRate = -1;
    slidingBar.playbackRate = -1;
    passingDot.playbackrate = -1;

    // starting the animation
    movingDot.play();
    slidingBar.play();
    movingDot.onfinish = passingDot;





    // decrementing and setting the step counter
    currentStep--;

    // set the current step number as the number in the progress dot on the page
    document.getElementById("progress__dot").innerHTML = currentStep;

    if (currentStep < 4) {
        document.getElementById('next').classList.add('is-active');
    }
    if (currentStep < 2) {
        document.getElementById('back').classList.remove('is-active');
    }

     // toggling the bold class for the step names
    document.getElementsByClassName('tab-' + (currentStep + 1))[0].classList.remove('bold');

    setTimeout(() =>
        {
            document.getElementsByClassName('tab-' + currentStep)[0].classList.add('bold');
        }, 400);



});

我希望圆点和滑块在页面上对齐，而不考虑缩放比例

javascript accessibility web-animations-api
1个回答
1
投票

[在做一些实验时，我发现我可以使用“ width”而不是scaleX来变换项目。这是我最终使用的内容：

下一个按钮事件：

 var slideBar = [
        {
            width: ((boxWidth / 3) * (currentStep - 1)) + 'px'
        },
        {
            width: ((boxWidth / 3) * (currentStep)) + 'px'
        }

    ];

返回按钮事件：

var slideBar = [
        {
            width: ((boxWidth / 3) * (currentStep - 2)) + 'px'
        },
        {
            width: ((boxWidth / 3) * (currentStep -1 )) + 'px'
        }

    ];
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