blocks|key|83472|text|使用jQuery，您可以比较文档高度、scrollTop位置和视口高度，这可能会得到所需的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|83473|与…有关的东西：|83474|$(window).scroll(function(){
++if(isMyStuffScrolling()){
++++//There+is+a+scroll+bar+here!
++}
});+

function+isMyStuffScrolling()+{
++var+docHeight+=+$(document).height();
++var+scroll++++=+$(window).height()+%2B+$(window).scrollTop();
++return+(docHeight+==+scroll);
}+|code-block|syntax|javascript|83475|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Using jQuery you can compare the document height, the scrollTop position and the viewport height, which might get you the answer you require.

Something along the lines of:

<pre><code>$(window).scroll(function(){
 if(isMyStuffScrolling()){
 //There is a scroll bar here!
 }
}); 

function isMyStuffScrolling() {
 var docHeight = $(document).height();
 var scroll = $(window).height() + $(window).scrollTop();
 return (docHeight == scroll);
} 
</code></pre>

blocks|key|83508|text|由于JavaScript的安全限制，我认为如果iframe内容来自另一个域，则无法做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|83509|编辑:在这种情况下，给iframe取一个名称=‘someframe’和id=‘someframe+2’，然后将框架‘someframe’.document.body.+of与document.getElementById('someframe2').offsetWidth进行比较，就可以给出答案。|83510|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I do not think this can be done if the iframe content comes from another domain due to JavaScript security limitations.

EDIT:
In that case, something along the lines of giving the iframe a name='someframe' and id='someframe2' and then comparing frames['someframe'].document.body.offsetWidth with document.getElementById('someframe2').offsetWidth should give you the answer.

blocks|key|83566|text|var+root=+document.compatMode=='BackCompat'?+document.body+:+document.documentElement;
var+isVerticalScrollbar=+root.scrollHeight>root.clientHeight;
var+isHorizontalScrollbar=+root.scrollWidth>root.clientWidth;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|83567|这将检测是否需要滚动条。对于iframes的默认情况，这与是否存在滚动条是一样的，但是如果滚动条被强制打开或关闭(在父文档中使用‘scrolling=“”yes“/”no“属性，或者在iframe文档中使用CSS’overflow:滚动/隐藏‘)，那么这可能有所不同。|unstyled|83568|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>var root= document.compatMode=='BackCompat'? document.body : document.documentElement;
var isVerticalScrollbar= root.scrollHeight&gt;root.clientHeight;
var isHorizontalScrollbar= root.scrollWidth&gt;root.clientWidth;
</code></pre>

This detects whether there is a need for a scrollbar. For the default of iframes this is the same as whether there is a scrollbar, but if scrollbars are forced on or off (using the ‘scrolling="yes"/"no"’ attribute in the parent document, or CSS ‘overflow: scroll/hidden’ in the iframe document) then this may differ.

blocks|key|51781|text|我认为你的第二次尝试是在正确的轨道上。除了this之外，您应该尝试滚动/检查document.body。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|51782|entityMap^0|L|4|12|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I think your second attempt is on the right track. Except instead of <code>this</code>, you should try scrolling/checking <code>document.body</code>.

blocks|key|51809|text|$(window).scroll(function(){
++if(isMyStuffScrolling()){
//scrolling
++}else{
//not+scrolling
}
});+

function+isMyStuffScrolling()+{
++var+docHeight+=+$(document).height();
++var+scroll++++=+$(window).height()+;//%2B+$(window).scrollTop();
++if(docHeight+>+scroll)+return+true;
++else+return+false;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|51810|改进--从Jon`s代码中略作修改|unstyled|51811|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>$(window).scroll(function(){
 if(isMyStuffScrolling()){
//scrolling
 }else{
//not scrolling
}
}); 

function isMyStuffScrolling() {
 var docHeight = $(document).height();
 var scroll = $(window).height() ;//+ $(window).scrollTop();
 if(docHeight &gt; scroll) return true;
 else return false;
}
</code></pre>

improved-changed a bit from Jon`s Winstanley code

blocks|key|3991|text|我发现这对任何元素都有效，至少在Chrome上是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3992|hasVerticalScrollbar+=+(element.scrollHeight+>+element.offsetHeight)
++++++++%7C%7C+
(element.scrollHeight+>+element.clientHeight|code-block|syntax|javascript|3993|使用Width而不是Height可以检测到相同的水平滚动条。|offset|length|style|CODE|3994|entityMap^0|0|0|2|5|A|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

I've found this works on any element, at least on Chrome:

<pre><code>hasVerticalScrollbar = (element.scrollHeight &gt; element.offsetHeight)
 || 
(element.scrollHeight &gt; element.clientHeight
</code></pre>

Horizontal scrollbars can be detected the same, using <code>Width</code> instead of <code>Height</code>.

How can I detect a Scrollbar presence ( using Javascript ) in HTML iFrame ?

I have already tried :

<pre><code> var vHeight = 0;
 if (document.all) {
 if (document.documentElement) {
 vHeight = document.documentElement.clientHeight;
 } else {
 vHeight = document.body.clientHeight
 }
 } else {
 vHeight = window.innerHeight;
 }

 if (document.body.offsetHeight &gt; vHeight) {
 //when theres a scrollbar
 }else{
 //when theres not a scrollbar
 }
</code></pre>

And I also had tried :

<pre><code> this.scrollLeft=1;
 if (this.scrollLeft&gt;0) {
 //when theres a scrollbar
 this.scrollLeft=0;
 }else{
 //when theres not a scrollbar
 return false;
 }
</code></pre>

With no success..

I have searched the javascript objets on DOM Inspector, but didn't find anything.

Is is possible to detect a scrollbar presence in a iframe in javacscript ?

<hr>

The iframe content comes from the same domain. 

No success until now..

<a href="http://www.upvtp.com.br/file.php/1/help_key.jpg">alt text http://www.upvtp.com.br/file.php/1/help_key.jpg</a>

How can I detect a Scrollbar presence ( using Javascript ) in HTML iFrame?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何检测HTML iFrame中滚动条的存在(使用Javascript )？我已经试过了:        var vHeight = 0;        if (document.all) {          if (document.documentElement) {            vHeight = d...

问如何检测HTML iFrame中滚动条的存在(使用Javascript )？
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