文章/答案/技术大牛

发布

社区首页 >问答首页 >浏览器缩放时ScaleX()的问题

问浏览器缩放时ScaleX()的问题
EN

Stack Overflow用户

提问于 2019-10-09 22:04:05

回答 1查看 68关注 0票数 0

在浏览器中放大时，scaleX()属性不会保持一致。TranslateX()完全按照它应该的方式工作，这就是我尝试使用它的原因。

我正在用Web Animations API和Vanilla JS构建一个步进栏，目的是有一个表单插入其中，这样当我们通过表单步骤时，动画/步骤将显示通过它的进度。我遇到的问题是当我测试ADA合规性时，特别是在放大页面时。更具体地说，只有当缩放百分比不是100的倍数时才会出现这种情况。因此，100%、200%、300%和400%都能完美地工作。但110,125,250%，仅举几个例子，是有问题的。在屏幕上滑动的点正常工作。

意想不到的行为出现在随着圆点在屏幕上扩展的条形图中，有时它走得太远，有时它走得不够远。真正让我困惑的是，条形图和点图都是由相同的测量值“控制”的，即取父div的宽度除以3，然后乘以当前步长。这就是为什么我认为问题出在scaleX转换中。我仍然在IE中测试，在chrome和firefox中遇到了这个问题。

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);



});

我希望点和滑块在穿过页面时对齐，而不管缩放百分比如何

accessibility

web-animations-api

javascript

回答 1

Stack Overflow用户

回答已采纳

发布于 2019-10-09 22:21:07

在做一些实验时，我想我可以只使用“宽度”来转换项目，而不是scaleX。以下是我最终使用的内容：

下一步按钮事件：

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

    ];

后退按钮事件：

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

    ];

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/58305992

复制

相似问题

问浏览器缩放时ScaleX()的问题
EN

回答 1

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问浏览器缩放时ScaleX()的问题EN

回答 1

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问浏览器缩放时ScaleX()的问题
EN