如何在所有现代浏览器中检测页面缩放级别?

如何在所有现代浏览器中检测页面缩放级别?虽然这篇文章讲述了如何在IE7和IE8中做到这一点，但我找不到一个好的跨浏览器解决方案。 Firefox存储页面缩放级别以供将来访问。在第一页加载，我能得到缩放级别吗?在某个地方，我读到当页面加载后发生缩放变化时，它是有效的。有办法捕捉'缩放'事件吗?

我需要这个，因为我的一些计算是基于像素的，他们可能会在放大时波动。

@tfl给出的修改样本

放大时，此页面会提示不同的高度值。(jsFiddle)

<html>
    <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js" type="text/javascript"/></script>
    </head>
    <body>
        <div id="xy" style="border:1px solid #f00; width:100px;">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque sollicitudin tortor in lacus tincidunt volutpat. Integer dignissim imperdiet mollis. Suspendisse quis tortor velit, placerat tempor neque. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Praesent bibendum auctor lorem vitae tempor. Nullam condimentum aliquam elementum. Nullam egestas gravida elementum. Maecenas mattis molestie nisl sit amet vehicula. Donec semper tristique blandit. Vestibulum adipiscing placerat mollis.</div>
        <button onclick="alert($('#xy').height());">Show</button>
    </body>
</html>

当前回答

问题在于使用的显示器类型，4k显示器和标准显示器。Chrome是迄今为止最聪明的，能够告诉我们缩放级别是什么，只是使用window.devicePixelRatio，显然它可以告诉什么像素密度是什么，并报告相同的数字。

其他浏览器就没有这么多了。IE和Edge可能是最差的，因为它们处理缩放级别的方式大不相同。要在4k显示器上获得相同大小的文本，您必须选择200%，而不是标准显示器上的100%。

截至2018年5月，以下是我检测到的一些最流行的浏览器(Chrome、Firefox和IE11)的缩放级别。我让它告诉我缩放百分比是多少。对于IE，即使4k显示器实际为200%，它也报告为100%，但文本大小实际上是相同的。

这里有一个小提琴:https://jsfiddle.net/ae1hdogr/

如果有人愿意尝试其他浏览器并更新小提琴，那么请这样做。我的主要目标是让这3个浏览器能够检测到人们在使用我的web应用程序时使用的缩放系数是否大于100%，并显示一个提示，建议使用更小的缩放系数。

2018-05-25 17:28:22

其他回答

这里没有变化!：

<html>
 <head>
  <title></title>
 </head>
<body>
 <div id="xy" style="width:400px;">
  foobar
 </div>
 <div>
  <button onclick="alert(document.getElementById('xy').style.width);">Show</button>
 </div>
</body>
</html>

创建一个简单的HTML文件，点击按钮。不管什么缩放级别:它会显示400px的宽度(至少在firefox和ie8上)

2009-11-12 10:17:54

我有这个解决方案只适用于手机(在Android上测试):

jQuery(function($){

zoom_level = function(){

    $("body").prepend('<div class="overlay" ' +
                'style="position:fixed; top:0%; left:0%; ' +
                'width:100%; height:100%; z-index:1;"></div>');

    var ratio = $("body .overlay:eq(0)").outerWidth() / $(window).width();
    $("body .overlay:eq(0)").remove();

    return ratio;
}

alert(zoom_level());

});

如果你想要缩放级别在缩放移动之后，你可能不得不设置一个小的超时，因为呈现延迟(但我不确定，因为我没有测试它)。

2014-07-09 18:22:09

这里有一个小提琴:https://jsfiddle.net/ae1hdogr/

2018-05-25 17:28:22

在移动设备(Chrome for Android或Opera mobile)上，你可以通过window.visualViewport.scale来检测缩放。 https://developer.mozilla.org/en-US/docs/Web/API/Visual_Viewport_API

在Safari上检测:document.documentElement.clientWidth / window。innerWidth(如果设备上没有缩放则返回1)。

2018-06-08 21:27:20

function supportFullCss3()
{
    var div = document.createElement("div");
    div.style.display = 'flex';
    var s1 = div.style.display == 'flex';
    var s2 = 'perspective' in div.style;

    return (s1 && s2);
};

function getZoomLevel()
{
    var screenPixelRatio = 0, zoomLevel = 0;

    if(window.devicePixelRatio && supportFullCss3())
        screenPixelRatio = window.devicePixelRatio;
    else if(window.screenX == '0')
        screenPixelRatio = (window.outerWidth - 8) / window.innerWidth;
    else
    {
        var scr = window.frames.screen;
        screenPixelRatio = scr.deviceXDPI / scr.systemXDPI;
    }

    //---------------------------------------
    if (screenPixelRatio <= .11){ //screenPixelRatio >= .01 &&
      zoomLevel = "-7";
    } else if (screenPixelRatio <= .25) {
      zoomLevel = "-6";
    }else if (screenPixelRatio <= .33) {
      zoomLevel = "-5.5";
    } else if (screenPixelRatio <= .40) {
      zoomLevel = "-5";
    } else if (screenPixelRatio <= .50) {
      zoomLevel = "-4";
    } else if (screenPixelRatio <= .67) {
      zoomLevel = "-3";
    } else if (screenPixelRatio <= .75) {
      zoomLevel = "-2";
    } else if (screenPixelRatio <= .85) {
      zoomLevel = "-1.5";
    } else if (screenPixelRatio <= .98) {
      zoomLevel = "-1";
    } else if (screenPixelRatio <= 1.03) {
      zoomLevel = "0";
    } else if (screenPixelRatio <= 1.12) {
      zoomLevel = "1";
    } else if (screenPixelRatio <= 1.2) {
      zoomLevel = "1.5";
    } else if (screenPixelRatio <= 1.3) {
      zoomLevel = "2";
    } else if (screenPixelRatio <= 1.4) {
      zoomLevel = "2.5";
    } else if (screenPixelRatio <= 1.5) {
      zoomLevel = "3";
    } else if (screenPixelRatio <= 1.6) {
      zoomLevel = "3.3";
    } else if (screenPixelRatio <= 1.7) {
      zoomLevel = "3.7";
    } else if (screenPixelRatio <= 1.8) {
      zoomLevel = "4";
    } else if (screenPixelRatio <= 1.9) {
      zoomLevel = "4.5";
    } else if (screenPixelRatio <= 2) {
      zoomLevel = "5";
    } else if (screenPixelRatio <= 2.1) {
      zoomLevel = "5.2";
    } else if (screenPixelRatio <= 2.2) {
      zoomLevel = "5.4";
    } else if (screenPixelRatio <= 2.3) {
      zoomLevel = "5.6";
    } else if (screenPixelRatio <= 2.4) {
      zoomLevel = "5.8";
    } else if (screenPixelRatio <= 2.5) {
      zoomLevel = "6";
    } else if (screenPixelRatio <= 2.6) {
      zoomLevel = "6.2";
    } else if (screenPixelRatio <= 2.7) {
      zoomLevel = "6.4";
    } else if (screenPixelRatio <= 2.8) {
      zoomLevel = "6.6";
    } else if (screenPixelRatio <= 2.9) {
      zoomLevel = "6.8";
    } else if (screenPixelRatio <= 3) {
      zoomLevel = "7";
    } else if (screenPixelRatio <= 3.1) {
      zoomLevel = "7.1";
    } else if (screenPixelRatio <= 3.2) {
      zoomLevel = "7.2";
    } else if (screenPixelRatio <= 3.3) {
      zoomLevel = "7.3";
    } else if (screenPixelRatio <= 3.4) {
      zoomLevel = "7.4";
    } else if (screenPixelRatio <= 3.5) {
      zoomLevel = "7.5";
    } else if (screenPixelRatio <= 3.6) {
      zoomLevel = "7.6";
    } else if (screenPixelRatio <= 3.7) {
      zoomLevel = "7.7";
    } else if (screenPixelRatio <= 3.8) {
      zoomLevel = "7.8";
    } else if (screenPixelRatio <= 3.9) {
      zoomLevel = "7.9";
    } else if (screenPixelRatio <= 4) {
      zoomLevel = "8";
    } else if (screenPixelRatio <= 4.1) {
      zoomLevel = "8.1";
    } else if (screenPixelRatio <= 4.2) {
      zoomLevel = "8.2";
    } else if (screenPixelRatio <= 4.3) {
      zoomLevel = "8.3";
    } else if (screenPixelRatio <= 4.4) {
      zoomLevel = "8.4";
    } else if (screenPixelRatio <= 4.5) {
      zoomLevel = "8.5";
    } else if (screenPixelRatio <= 4.6) {
      zoomLevel = "8.6";
    } else if (screenPixelRatio <= 4.7) {
      zoomLevel = "8.7";
    } else if (screenPixelRatio <= 4.8) {
      zoomLevel = "8.8";
    } else if (screenPixelRatio <= 4.9) {
      zoomLevel = "8.9";
    } else if (screenPixelRatio <= 5) {
      zoomLevel = "9";
    }else {
      zoomLevel = "unknown";
    }

    return zoomLevel;
};

2015-09-22 23:30:50

如何在所有现代浏览器中检测页面缩放级别?

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