Make Iframe to fit 100% of container's remaini-第2页回答

I want to design a web page with a banner and an iframe. I hope the iframe can fill all the remaining page height and be resized automatically as the browser is resizing. Is it possible to get it done without writing Javascript code, only with CSS?

I tried set height:100% on iframe, the result is quite close but the iframe tried to fill the whole page height, including the 30px height of banner div element, so I got unneccessary vertical scrollbar. It's not perfect.

Update Notes: Excuse me for not describing the question well, I tried CSS margin, padding attribute on DIV to occupy the whole remining height of a web page successfully, but the trick didn't work on iframe.

 <body>
    <div style="width:100%; height:30px; background-color:#cccccc;">Banner</div>
    <iframe src="http: //www.google.com.tw" style="width:100%; height:100%;"></iframe>
</body>

Any idea is appreciated.

标签： html css iframe

26条回答

孤傲高冷的网名

2楼-- · 2019-01-03 08:04

You can do this by measuring the body size on load/resize events and setting the height to the (full height - banner height).

Note that currently in IE8 Beta2 you can't do this onresize as that event is currently broken in IE8 Beta2.

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Juvenile、少年°

3楼-- · 2019-01-03 08:06

The trick is to understand what the 100% is taken of. Reading CSS specs can help you there.

To make a long story short - there is such a thing as "containing block" - which is not necessary the parent element. Simply said, it is the first element up the hierarchy that has position:relative or position:absolute. Or the body element itself if there is nothing else. So, when you say "width: 100%", it checks the width of the "containing block" and sets the width of your element to the same size. If there was something else there, then you might get contents of a "containing block" that are larger than itself (thus "overflowing").

Height works the same way. With one exception. You can't get height to 100% of the browser window. The very top level element, against which 100% can be calculated, is the body (or html? not sure) element, and that stretches just enough to contain its contents. Specifying height:100% on it will have no effect, because it has no "parent element" against which to measure 100%. Window itself doesn't count. ;)

To make something stretch exactly 100% of the window, you have two choices:

Use JavaScript

Don't use DOCTYPE. This is not a good practice, but it puts the browsers in "quirks mode", in which you can do height="100%" on elements and it will stretch them to the window size. Do note, that the rest of your page will probably have to be changed too to accommodate for the DOCTYPE changes.

Update: I'm not sure if I wasn't wrong already when I posted this, but this certainly is outdated now. Today you can do this in your stylesheet: html, body { height: 100% } and it will actually stretch to the whole of your viewport. Even with a DOCTYPE. min-height: 100% could also be useful, depending on your situation.

And I wouldn't advise anyone to make a quirks-mode document anymore either, because it causes way more headaches than solves them. Every browser has a different quirks-mode, so getting your page to look consistently across browsers becomes two orders of magnitude more difficult. Use a DOCTYPE. Always. Preferably the HTML5 one - <!DOCTYPE html>. It's easy to remember and works like a charm in all browsers, even the 10 years old ones.

The only exception is when you have to support something like IE5 or something. If you're there, then you're on your own anyway. Those ancient browsers are nothing like the browsers today, and little advice that is given here will help you with them. On the bright side, if you're there, you probably just have to support ONE kind of browser, which gets rid of the compatibility problems.

Good luck!

Update 2: Hey, it's been a long time! 6 years later, new options are on the scene. I just had a discussion in the comments below, here are more tricks for you that work in today's browsers.

Option 1 - absolute positioning. Nice and clean for when you know the precise height of the first part.

body, html {width: 100%; height: 100%; margin: 0; padding: 0}
.first-row {position: absolute;top: 0; left: 0; right: 0; height: 100px; background-color: lime;}
.second-row {position: absolute; top: 100px; left: 0; right: 0; bottom: 0; background-color: red }
.second-row iframe {display: block; width: 100%; height: 100%; border: none;}

<div class="first-row">
  <p>Some text</p>
  <p>And some more text</p>
</div>
<div class="second-row">
  <iframe src="https://jsfiddle.net/about"></iframe>
</div>

Some notes - the second-row container is needed because bottom: 0 and right: 0 doesn't work on iframes for some reason. Something to do with in being a "replaced" element. But width: 100% and height: 100% works just fine. display: block is needed because it's an inline element by default and whitespace starts creating weird overflows otherwise.

Option 2 - tables. Works when you don't know the height of the first part. You can use either actual <table> tags or do it the fancy way with display: table. I'll go for the latter because it seems to be in fashion these days.

body, html {width: 100%; height: 100%; margin: 0; padding: 0}
.row-container {display: table; empty-cells: show; border-collapse: collapse; width: 100%; height: 100%;}
.first-row {display: table-row; overflow: auto; background-color: lime;}
.second-row {display: table-row; height: 100%; background-color: red; overflow: hidden }
.second-row iframe {width: 100%; height: 100%; border: none; margin: 0; padding: 0; display: block;}

<div class="row-container">
  <div class="first-row">
    <p>Some text</p>
    <p>And some more text</p>
  </div>
  <div class="second-row">
    <iframe src="https://jsfiddle.net/about"></iframe>
  </div>
</div>

Some notes - the overflow: auto makes sure that the row always includes all of its contents. Otherwise floating elements can sometimes overflow. The height: 100% on the second row makes sure it expands as much as it can squeezing the first row as small as it gets.

Option 3 - flexbox. The cleanest one of them all, but with a less than stellar browser support. IE10 will need -ms- prefixes for the flexbox properties, and anything less will not support it at all.

body, html {width: 100%; height: 100%; margin: 0; padding: 0}
.row-container {display: flex; width: 100%; height: 100%; flex-direction: column; background-color: blue; overflow: hidden;}
.first-row {background-color: lime; }
.second-row { flex-grow: 1; border: none; margin: 0; padding: 0; }

<div class="row-container">
  <div class="first-row">
    <p>Some text</p>
    <p>And some more text</p>
  </div>
  <iframe src="https://jsfiddle.net/about" class="second-row"></iframe>
</div>

Some notes - the overflow: hidden is because the iframe still generates some sort of overflow even with display: block in this case. It isn't visible in the fullscreen view or the snippet editor, but the small preview window gets an extra scrollbar. No idea what that is, iframes are weird.

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老娘就宠你

4楼-- · 2019-01-03 08:06

I used display:table to fix a similar issue. It almost works for this, leaving a small vertical scroll bar. If you're trying to populate that flexible column with something other than an iframe it works fine (not

Take the following HTML

<body>
  <div class="outer">
    <div class="banner">Banner</div>
    <div class="iframe-container">
      <iframe src="http: //www.google.com.tw" style="width:100%; height:100%;border:0;"></iframe>
    </div>
  </div>
</body>

Change the outer div to use display:table and ensure it has a width and height set.

.outer {
  display: table;
  height: 100%;
  width: 100%;
}

Make the banner a table-row and set its height to whatever your preference is:

.banner {
  display: table-row;
  height: 30px;
  background: #eee;
}

Add an extra div around your iframe (or whatever content you need) and make it a table-row with height set to 100% (setting its height is critical if you want to embed an iframe to fill the height)

.iframe-container {
  display: table-row;
  height: 100%;
}

Below is a jsfiddle showing it at work (without an iframe because that doesn't seem to work in the fiddle)

https://jsfiddle.net/yufceynk/1/

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甜甜的少女心

5楼-- · 2019-01-03 08:11

It's right, you are showing an iframe with 100% height respect to its container: the body.

Try this:

<body>
  <div style="width:100%; height:30px; background-color:#cccccc;">Banner</div>
  <div style="width:100%; height:90%; background-color:transparent;">
    <iframe src="http: //www.google.com.tw" style="width:100%; height:100%;">
    </iframe> 
  </div>
</body>

Of course, change the height of the second div to the height you want.

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ら.Afraid

6楼-- · 2019-01-03 08:12

you cant set the iframe height in % because your parent body height is not 100% so make the parent height as 100% and then apply iframe height 100%

For eg.
<html>
<head>
<style>
html,body{height:100%}
</style> 
</head>
<body>
<iframe src="http://www.quasarinfosystem.com" height="100%" width="100%" ></iframe>
</body>
</html>

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手持菜刀，她持情操

7楼-- · 2019-01-03 08:13

You can do it with DOCTYPE, but you have to use table. Check this out:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<style>
*{margin:0;padding:0}
html, body {height:100%;width:100%;overflow:hidden}
table {height:100%;width:100%;table-layout:static;border-collapse:collapse}
iframe {height:100%;width:100%}

.header {border-bottom:1px solid #000}
.content {height:100%}
</style>
</head>
<body>
<table>
    <tr><td class="header"><div><h1>Header</h1></div></td></tr>
    <tr><td class="content">
        <iframe src="http://google.com/" frameborder="0"></iframe></td></tr>
</table>
</body>
</html>

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Make Iframe to fit 100% of container's remaini

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