一个空间等于多少个像素?

发布于 2024-10-04 19:01:30 字数 588 浏览 5 评论 0原文

这是我的代码:

<div style="position:absolute;top:300px;width:50px;height:50px;background:red;color:black;word-wrap:break-word;">
        <div contenteditable=true>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            aaaaa
            bbbbbbbbbbb
        </div>
</div>

我想填充 div 中的所有空间。

&nbsp; 有多少像素?

This is my code:

<div style="position:absolute;top:300px;width:50px;height:50px;background:red;color:black;word-wrap:break-word;">
        <div contenteditable=true>
                       
                       
            aaaaa
            bbbbbbbbbbb
        </div>
</div>

I want to fill all of the space in the div.

How many pixels is the  ?

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评论(8

下壹個目標 2024-10-11 19:01:30

您可以创建一个包含  

并分配一个 id。设置字体大小和属性。然后使用以下命令读取当前宽度和高度:

var space=document.getElementById("space");
var height=(space.clientHeight+1)+"px";
var width=(space.clientWidth+1)+"px";

You can create a <div> containing   and assign an id. Set the font size and attributes. Then read the current width and height using:

var space=document.getElementById("space");
var height=(space.clientHeight+1)+"px";
var width=(space.clientWidth+1)+"px";
雅心素梦 2024-10-11 19:01:30

这取决于字体、大小等。空间到像素没有直接的方程式/数字。

It depends on the font, size, etc. There's no direct equation/number for spaces to pixels.

忘东忘西忘不掉你 2024-10-11 19:01:30

它取决于字体大小,因为   是空白字符。

It's dependent on the font size because   is a white-space character.

本王不退位尔等都是臣 2024-10-11 19:01:30

“em”(1 个字符宽度)通常被认为是 16 x 16 像素。当然,如果查看者调整文本大小,情况就会改变。

我不确定你想做什么,但如果你只想在文本上方留出空白,你可以在你的 div 中放置另一个 div (用于文本),然后设置一个“ margin-top: 10em; ” (或者无论你想要多少个 em)来提供空白。

An "em" (1 character width) is often considered to be 16 x 16 pixels. Of course, if a viewer resizes text, that would change.

I'm not sure what you're trying to do, but if you just want empty space above your text, you could put another div (for the text) inside your div, and then set a " margin-top: 10em; " (or however many ems you want) to provide the blank space.

半城柳色半声笛 2024-10-11 19:01:30

没有办法诚实地回答这个问题,因为一个空格的大小会根据字体大小而变化。

试试这个,将“30px”更改为您想要的任何值。

<div style="position:absolute;top:300px;width:50px;height:50px;background:red;color:black;word-wrap:break-word;">
        <div contenteditable=true style="margin-left: 30px;">
            aaaaa
            bbbbbbbbbbb
        </div>
</div>

There is no way to answer this question honesty, as the size of one space changes depending on the font size.

Try this, changing the "30px" to whatever you want.

<div style="position:absolute;top:300px;width:50px;height:50px;background:red;color:black;word-wrap:break-word;">
        <div contenteditable=true style="margin-left: 30px;">
            aaaaa
            bbbbbbbbbbb
        </div>
</div>
花想c 2024-10-11 19:01:30

答案将取决于您使用的字体及其指定的样式。因此,您需要在页面中动态计算它。

使用 Javascript 创建一个在页面外显示的 div(即 left:-4000px;},其中包含一个   字符。确保该元素与您的 contentEditable div 具有相同的文本样式。该元素的宽度应为空格字符的宽度(确保不包含任何填充或边框等)

我没有尝试过这个,但这是我首先尝试的。

The answer will depend on the font you are using and the styles it has been given. So you'll need to calculate it dynamically in the page.

Use Javascript to create an div that is displayed off the page (i.e left:-4000px;} that contains one   character. Make sure this element has the same text styling as the your contentEditable div. The width of this element should be the width of the space character (make sure you're not including any padding or borders etc.)

I've not tried this, but that's what I'd try first.

耀眼的星火 2024-10-11 19:01:30

您可以使用“em”而不是“px”。第一个关于“em”的谷歌搜索链接:http://www.xs4all.nl/~sbpoley /webmatters/emex.html

尝试这样的构造

<div style="position:absolute;top:300px;width:{count_of_letters}em; height:50px;background:red;color:black;word-wrap:break-word;">
    <div contenteditable=true>
                   
                   
        aaaaa
        bbbbbbbbbbb
    </div>

,但最好忘记这个想法并使用本主题中其他评论中的 CSS 规则。

You may use "em" instead of "px". First googled link about "em": http://www.xs4all.nl/~sbpoley/webmatters/emex.html

Try such construction

<div style="position:absolute;top:300px;width:{count_of_letters}em; height:50px;background:red;color:black;word-wrap:break-word;">
    <div contenteditable=true>
                   
                   
        aaaaa
        bbbbbbbbbbb
    </div>

But better to forget this idea and use CSS rules from other comments in this topic.

勿忘初心 2024-10-11 19:01:30

Unicode 为许多空格字符定义了固定宽度。 此处的下表是 Unicode 规范的摘要 (Unicode 14,第 266 页):

<表类=“s-表”>
<标题>

代码
角色名称
字符宽度


<正文>

U+0020
空间
取决于字体,通常为 1/4 em,经常调整

U+00A0
不间断空格
作为空格,但经常不调整

U+1680
奥格姆空间标记
未指定;通常不是一个空格而是一个破折号

U+180E
蒙古语元音分隔符
0

U+2000
EN四
1 en (= 1/2 em)

U+2001
EM 四元组
1 em(名义上,字体的高度)

U+2002
EN SPACE(坚果)
1 en (= 1/2 em)

U+2003
EM SPACE(羊肉)
1em

U+2004
三个空格(厚空格)
1/3 em

U+2005
四个空格(中间空格)
1/4 em

U+2006
每 EM 六个空间
1/6 em

U+2007
图形空间
“Tabular width”,数字的宽度

U+2008
标点符号空格
句点“.”的宽度

U+2009
稀疏空间
1/5 em(或有时 1/6 em)

U+200A
头发空间
比薄空间更窄

U+200B
零宽度空间
0

U+202F
狭窄的不间断空间
比 NO-BREAK SPACE(或 SPACE)窄,“通常是薄空间或中间空间的宽度”

U+205F
中等数学空间
4月18日

U+3000
表意空间
表意 (CJK) 字符的宽度。

U+FEFF
零宽度无中断空间
0

不幸的是,公共空间没有定义为具有固定宽度。它不仅取决于字体大小和明确的样式,还取决于缩放级别和系统显示缩放比例等。

然而,0.25em 通常会让您关闭。以像素为单位,它是字体高度的 1/4;但如果您尝试将 em 单位调整为 px 尺寸,则最好使用 calc(),或者仅使用 em

或者,考虑不需要您知道空间有多宽的样式策略。例如,对于 OP 的“填充 div 中的所有空间”的目标,父 divwidthheight 可以是设置为 max-content,或者子 div 的样式可以设置为 white-space:nowrap

或者,例如,可以用伪元素替换 Flex 布局中的间隙,例如,可以插入包含带有 white-space: pre 的空格的元素来创建正确大小的间隙:

.explicit-gap { 
  gap: 0.25em; 
}

.implicit-space > :not(:first-child):before {
  content: ' ';
  white-space: pre;
}

div { display: flex; }

/* just some labels, nothing interesting down here */
.explicit-gap:after { content: "(using 'gap')" }
.implicit-space:after { content: "(using ':before')" }
.no-styling:after { content: "(no gap set)" }
.control:after { content: "(actual spaces)" }
div:after { position: absolute; left: 25ex; opacity:.5; }
<div class="explicit-gap">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="implicit-space">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="no-styling">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="control">
  <span>Here are some words</span>
</div>

ETC。

Unicode defines fixed widths for a number of space characters. The following table from here is a summary of Unicode's specs (Unicode 14, p. 266):

CodeName of the characterWidth of the character
U+0020SPACEDepends on font, typically 1/4 em, often adjusted
U+00A0NO-BREAK SPACEAs a space, but often not adjusted
U+1680OGHAM SPACE MARKUnspecified; usually not really a space but a dash
U+180EMONGOLIAN VOWEL SEPARATOR0
U+2000EN QUAD1 en (= 1/2 em)
U+2001EM QUAD1 em (nominally, the height of the font)
U+2002EN SPACE (nut)1 en (= 1/2 em)
U+2003EM SPACE (mutton)1 em
U+2004THREE-PER-EM SPACE (thick space)1/3 em
U+2005FOUR-PER-EM SPACE (mid space)1/4 em
U+2006SIX-PER-EM SPACE1/6 em
U+2007FIGURE SPACE“Tabular width”, the width of digits
U+2008PUNCTUATION SPACEThe width of a period “.”
U+2009THIN SPACE1/5 em (or sometimes 1/6 em)
U+200AHAIR SPACENarrower than THIN SPACE
U+200BZERO WIDTH SPACE0
U+202FNARROW NO-BREAK SPACENarrower than NO-BREAK SPACE (or SPACE), “typically the width of a thin space or a mid space”
U+205FMEDIUM MATHEMATICAL SPACE4/18 em
U+3000IDEOGRAPHIC SPACEThe width of ideographic (CJK) characters.
U+FEFFZERO WIDTH NO-BREAK SPACE0

Unfortunately the common space is not defined as having a fixed width. It depends not only on font size and explicit styling, but also on zoom level and system display scaling, among other things.

However, 0.25em will generally get you close. In pixels it would be 1/4 the font height; but you'd be better off using calc() if you are trying to fit em units to px dimensions, or just use em.

Alternatively, consider styling strategies that don't require you to know how wide a space is. For the OP's goal of "fill all of the space in the div", for example, the width and height of the parent div could be set to max-content, or the child div could be styled as white-space:nowrap.

Or, for example, gaps in flex layouts could be replaced with pseudo elements, e.g. here an element containing a space with white-space: pre can be inserted to create a correctly sized gap:

.explicit-gap { 
  gap: 0.25em; 
}

.implicit-space > :not(:first-child):before {
  content: ' ';
  white-space: pre;
}

div { display: flex; }

/* just some labels, nothing interesting down here */
.explicit-gap:after { content: "(using 'gap')" }
.implicit-space:after { content: "(using ':before')" }
.no-styling:after { content: "(no gap set)" }
.control:after { content: "(actual spaces)" }
div:after { position: absolute; left: 25ex; opacity:.5; }
<div class="explicit-gap">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="implicit-space">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="no-styling">
  <span>Here</span>
  <span>are</span>
  <span>some</span>
  <span>words</span>
</div>

<div class="control">
  <span>Here are some words</span>
</div>

Etc.

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