如何检索HTML元素的实际宽度和高度?

假设我有一个<div>，我希望它位于浏览器显示(视口)的中央。为此，我需要计算<div>元素的宽度和高度。

我应该用什么?请包括浏览器兼容性信息。

当前回答

使用width参数如下:

   style={{
      width: "80%",
      paddingLeft: 100,
      paddingRight: 200,
      paddingTop: 30,
      paddingBottom: 30,
      border: "3px solid lightGray",
    }}

2020-11-02 17:56:43

其他回答

．.．看起来CSS有助于把div放在中心…

<style>
 .monitor {
 position:fixed;/* ... absolute possible if on :root */
 top:0;bottom:0;right:0;left:0;
 visibility:hidden;
 }
 .wrapper {
 width:200px;/* this is size range */
 height:100px;
 position:absolute;
 left:50%;top:50%;
 visibility:hidden;
 }

 .content {
 position:absolute;
 width: 100%;height:100%;
 left:-50%;top:-50%;
 visibility:visible;
 }

</style>

 <div class="monitor">
  <div class="wrapper">
   <div class="content">

 ... so you hav div 200px*100px on center ...

  </div>
 </div>
</div>

2012-03-01 00:21:40

你只需要为IE7和更老版本计算它(只有当你的内容没有固定大小时)。我建议使用HTML条件注释来限制攻击不支持CSS2的旧ie。对于所有其他浏览器使用这个:

<style type="text/css">
    html,body {display:table; height:100%;width:100%;margin:0;padding:0;}
    body {display:table-cell; vertical-align:middle;}
    div {display:table; margin:0 auto; background:red;}
</style>
<body><div>test<br>test</div></body>

这是一个完美的解决方案。它将任何大小的<div>居中，并将其收缩到其内容的大小。

2008-11-16 20:57:23

我为此创建了一个具有高度灵活性的效用函数:

export type Size = {width: number, height: number};
export enum GetSize_Method {
    /** Includes: content, padding. Excludes: border, margin, scroll-bar (if it has one), "position:absolute" descendants. */
    ClientSize = "ClientSize",
    /** Includes: content, padding, border, margin, scroll-bar (if it has one). Excludes: "position:absolute" descendants. */
    OffsetSize = "OffsetSize",
    /** Includes: content, padding, border, margin, scroll-bar (if it has one), "position:absolute" descendants. Excludes: none. */
    ScrollSize = "ScrollSize",
    /** Same as ScrollSize, except that it's calculated after the element's css transforms are applied. */
    BoundingClientRect = "BoundingClientRect",
    /** Lets you specify the exact list of components you want to include in the size calculation. */
    Custom = "Custom",
}
export type SizeComp = "content" | "padding" | "border" | "margin" | "scrollBar" | "posAbsDescendants";

export function GetSize(el: HTMLElement, method = GetSize_Method.ClientSize, custom_sizeComps?: SizeComp[]) {
    let size: Size;
    if (method == GetSize_Method.ClientSize) {
        size = {width: el.clientWidth, height: el.clientHeight};
    } else if (method == GetSize_Method.OffsetSize) {
        size = {width: el.offsetWidth, height: el.offsetHeight};
    } else if (method == GetSize_Method.ScrollSize) {
        size = {width: el.scrollWidth, height: el.scrollHeight};
    } else if (method == GetSize_Method.BoundingClientRect) {
        const rect = el.getBoundingClientRect();
        size = {width: rect.width, height: rect.height};
    } else if (method == GetSize_Method.Custom) {
        const style = window.getComputedStyle(el, null);
        const styleProp = (name: string)=>parseFloat(style.getPropertyValue(name));

        const padding = {w: styleProp("padding-left") + styleProp("padding-right"), h: styleProp("padding-top") + styleProp("padding-bottom")};
        const base = {w: el.clientWidth - padding.w, h: el.clientHeight - padding.h};
        const border = {w: styleProp("border-left") + styleProp("border-right"), h: styleProp("border-top") + styleProp("border-bottom")};
        const margin = {w: styleProp("margin-left") + styleProp("margin-right"), h: styleProp("margin-top") + styleProp("margin-bottom")};
        const scrollBar = {w: (el.offsetWidth - el.clientWidth) - border.w - margin.w, h: (el.offsetHeight - el.clientHeight) - border.h - margin.h};
        const posAbsDescendants = {w: el.scrollWidth - el.offsetWidth, h: el.scrollHeight - el.offsetHeight};

        const sc = (name: SizeComp, valIfEnabled: number)=>custom_sizeComps.includes(name) ? valIfEnabled : 0;
        size = {
            width: sc("content", base.w) + sc("padding", padding.w) + sc("border", border.w)
                    + sc("margin", margin.w) + sc("scrollBar", scrollBar.w) + sc("posAbsDescendants", posAbsDescendants.w),
            height: sc("content", base.h) + sc("padding", padding.h) + sc("border", border.h)
                    + sc("margin", margin.h) + sc("scrollBar", scrollBar.h) + sc("posAbsDescendants", posAbsDescendants.h),
        };
    }
    return size;
}

用法:

const el = document.querySelector(".my-element");
console.log("Size:", GetSize(el, "ClientSize"));
console.log("Size:", GetSize(el, "Custom", ["content", "padding", "border"]));

2021-06-30 01:03:25

下面是WKWebView的代码，它决定了特定Dom元素的高度(不适用于整个页面)

let html = "<body><span id=\"spanEl\" style=\"font-family: '\(taskFont.fontName)'; font-size: \(taskFont.pointSize - 4.0)pt; color: rgb(\(red), \(blue), \(green))\">\(textValue)</span></body>"
webView.navigationDelegate = self
webView.loadHTMLString(taskHTML, baseURL: nil)

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    webView.evaluateJavaScript("document.getElementById(\"spanEl\").getBoundingClientRect().height;") { [weak self] (response, error) in
        if let nValue = response as? NSNumber {

        }
    }
}

2018-05-31 11:52:38

元素。offsetWidth和元素。offsetHeight应该这样做，就像在之前的帖子中建议的那样。

但是，如果您只想集中内容，还有更好的方法。假设您使用严格的xhtml DOCTYPE。设置body标签的margin:0,auto属性和所需宽度(px)。内容与页面居中对齐。

2008-11-16 19:50:32

如何检索HTML元素的实际宽度和高度?

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