I need help with this two elements properties.
According MDN element.scrollHeight "this a height of the scroll view of an element; it includes the element padding but not its margin", and element.offsetHeight "Typically, an element's offsetHeight is a measurement which includes the element borders, the element vertical padding, the element horizontal scrollbar (if present, if rendered) and the element CSS height."
I am trying to debug some javascript code and don't understand why document.body.scrollHeight can be greater than document.body.offsetHeight?
For example, my document.body.offsetHeight=909, but document.body.scrollHeight=1059 (body don't have any margins or paddings or borders), so we lost 150px somewhere. I inspected body and it height=909, and this is very confuse me. This reproduced in chrome and firefox.
Can you please help me in this question?
The offsetHeight property describes how far from the top of the current available space in the active window. The scrollHeight property is how far in pixels from the inside top of a contain to the inside bottom, which is different than clientHeight on a container set to a limited height with overflow:scroll css property.
I am using most of these in project I am working on at http://prettydiff.com/jsgui/
Related
I tried to calculate offSetWidth of a div element which has the following css properties:
1)Height:500px
2)overflow:auto
3)dir:rtl
4)box-sizing:border-box
I added less content in the div so that the div does not show any scroll and used offSetWidth property to calculate offSetWidth and it was 1302.
Then I added more content so that the browser started adding a scrollbar to the div. I again used offSetWidth property to calculate the offSetWidth with scrollbar in the div.
The result was surprisingly 1302 again.
Now I'm unable to figure out the reason why the offSetWidth of the div is same when the div has scrollbar and when it does not have scrollbar.
Please help me in this regard.
THANKS IN ADVANCE
It's possible that the scrollbar is being included in the offsetWidth calculation even when it's not visible.
To confirm this, you can try using the clientWidth property instead, which returns the width of the content area of the element excluding padding but including the scrollbar (if any). If the clientWidth changes when you add more content and the scrollbar becomes visible, then this confirms that the scrollbar is being included in the offsetWidth calculation.
Alternatively, you can try using the scrollWidth property, which returns the total width of the content area of the element, including any parts that are currently hidden because of overflow. If the scrollWidth is greater than the clientWidth, then this confirms that the scrollbar is present and the offsetWidth includes it.
What is the difference between Element.scrollHeight and the height returned by the JQuery $(ElementSelector).height() method.
I have seen this and this and I know that scrollHeight is the height of content, including the content which overflows outside the viewport. My question is that isn't that the same as the height returned by the height() method. I wrote this JSFiddle as a test of that.
Another difference is...
The height property sets the height of an element and does not include padding, borders, or margins; it sets the height of the area inside the padding, border, and margin of the element.
scrollHeight includes the element's padding, but not its border or margin.
https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight
height():
returns the actual height of an element in pixels.
scrollHeight():
is a measurement of the height of an element's content including content not visible on the screen due to overflow
Learn more about Box Model.
In the DOM, what is the difference between an element’s offsetHeight and its scrollHeight? An image in explanation would be a great help.
HTMLElement.offsetHeight is a measurement which includes the element borders, the element vertical padding, the element horizontal scrollbar (if present, if rendered) and the element CSS height.
HTMLElement.scrollHeight is a measurement of the height of an element's content including content not visible on the screen due to overflow. The value returned by HTMLElement.scrollHeight WILL include the padding-top and padding-bottom, but will NOT include the element borders or the element horizontal scrollbar.
This page and this page are my sources.
The MDN documentation also provides images to demonstrate.
As #Csarsam said, offset height is the border-box height (I'm rewording). Scroll height, is the height of the scrollable content, which is generally composed of multiple elements. But scroll height it also defined on elements which does not scroll, hence does not have a scrollable content, in which case (I’ve checked but I have no reference to back it up) scroll height is its content height, that is, it does not include the margins and borders. But when the element is part of a scrollable content, its margin are taken into account to compute the scroll height of its parent.
Scroll height is defined on both scrollable content and non‑scrollable content, that’s what may confuse.
Update
Here is a reference which confirms what I’ve checked: https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight
the alerts are as follows:
alert(document.getElementById("col_st_scroll").offsetHeight);
alert(document.getElementById("col_st_scroll").style.height);
now, the col_st_scroll element is fully visible in the web browser, shouldn't that mean offsetHeight and style.height should returnt he same value?
problem solved. The element was resized by another function in the time it took to click ok ont he first alert.
This is from MDN:
Typically, an element's offsetHeight is a measurement which includes the element borders, the element vertical padding, the element horizontal scrollbar (if present, if rendered) and the element CSS height.
The style.height property represents the content height only (assuming you're on "strict" rendering mode, not "quirks").
I notice that offsetwidth is a slightly bigger number. Similarly for style.height and offsetheight.
offsetWidth returns computed element's width, while el.style.width just returns width property defined in element.style by javascript and does not reflect real element's dimensions.
This means that if you will try to get a width of the element by accessing el.style, you will probably get nothing (sample), even if the width was defined in your CSS. You will get the number only if it was defined in el.style by javascript.
Furthermore, offsetWidth gives you real width of your element, including padding and border if you use content-box css box model which is default value for box-sizing. So you can think about that like you set width of the contents of the element and padding/border go on top of that (sample).
If you are using border-box css box model, you set the total width of the element, including padding and border make the content area smaller (sample). So, in this case, offsetWidth and el.style.width would return exactly the same numbers (if el.style.width was previously set by javascript).
Typically, an element's offsetWidth is a measurement which includes the element borders, the element horizontal padding, the element vertical scrollbar (if present, if rendered) and the element CSS width.
Source: https://developer.mozilla.org/en/DOM/element.offsetWidth
So, it's the width of your element with border and padding included. Same thing for height.
offsetWidth is a measurement in pixels of the element's CSS width, including any borders, padding, and vertical scrollbars.
clientWidth is the inner width (ie. the space inside an element including padding but excluding borders and scrollbars)
with only return the css with defined