Css calculate height dynamically


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I have three div elements: one as a header, one as a footer, and a center content div. Just look for my solution on jsfiddleit is based on csslayout. I found this courtesy of ryanfait.

It's actually remarkably simple. In order to float a footer to the bottom of the page when content is shorter than window-height, or at the bottom of the content when it is longer than window-height, utilize the following code:.

Note: Nothing should be placed outside the ' content' and ' footer' divs unless it is absolutely positioned.

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Note: Nothing should be placed inside the ' push' div as it will be hidden. To make headers or footers span the width of a page, you must absolutely position the header. Note: If you add a page-width header, I found it necessary to add an extra wrapper div to content. The outer div controls horizontal spacing while the inner div controls vertical spacing. I was required to do this because I found that 'min-height:' works only on the body of an element and adds padding to the height.

It will automatically choose the bigger one from the two as its height, which means if the content is longer than the browser, it will be the height of the content, otherwise, the height of the browser.

This is standard css. As mentioned elsewhere, the CSS function calc can work nicely here. It is now mostly supported. You could use like:. You propably have to write some JavaScript, because there is no way to estimate the height of all the users of the page. There is a min-height: css style, but it doesn't work in all browsers. I know a and c have fixed heights, but I rather measure them in case they change later.

Also, I am measuring the height of b I don't want to make is smaller after allbut if there is an image in there that did not load the height can change, so watch out for things like that. Which simply adds an element into that div with the correct height - that effectively acts as min-height even for browsers that don't have it.

You may want to add the element into your markup, and then just control the height of it via javascript instead of also adding it that way, that way you can take it into account when designing the layout.The modern web is a flexible experience with so many screen sizes and devices to support.

This means fluid, responsive designs are a requirement. The CSS calc make it much easier to build fluid, responsive layouts. This can lead to a sticky situation if you want an element to naturally resize as its parent element or window dimensions change. In the past this was pretty hard to implement and generally would require some sort of JavaScript listening to the browser's resize event.

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You place some sort of mathematical equation in the function and the browser will automatically calculate an updated property value as the screen size changes. You want the right-side content to shrink and expand, while keeping the logo fixed. How do you ensure you are not wasting available space with that right-side content?

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The calc method to the rescue. I want to make a note you need to know how large the actual box is for the fixed size element.

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Margins do play a part here. Another point I want to make is to make sure you track the fixed dimension elements in the layout. In a responsive design I may have the logo fixed at pixels when the browser Viewport width is greater than pixels, but 75 pixels above pixels and 50 pixels below pixels.

This means I need to correctly set rules inside corresponding media queries to adjust the calc method. Note how you are able to still leverage inside a media query. This makes it easier to design great responsive layouts. The CSS calc method is a simple little trick to help you make nice fluid, responsive web designs for your modern web applications.

We use cookies to give you the best experience possible. By continuing, we'll assume you're cool with our cookie policy. Today modern browsers all support the CSS calc function. Yes, a function in CSS!Learn Development at Frontend Masters.

css calculate height dynamically

Being able to do math in code is nice and a welcome addition to a language that is fairly number heavy. But is it useful?

css calculate height dynamically

There definitely are some though. All CSS Preprocessors do have math functions and they are pretty useful. The most useful ability of calc is its ability to mix unitslike percentages and pixels. No Preprocessor will ever be able to do that.

It is something that has to happen at render time. It is surprisingly good. Can I use… is always great for checking out the details there. It can be nice to make a colored module as tall as the parent element in some cases.

You want the content to scroll, but you want just the content to scroll, not the entire module. Just set overflow-y: auto; right?

css calculate height dynamically

Not quite, because overflow-y is only useful if the content element itself has a set height that can be overflowed. You could set the header to overflow with ellipsis.

That would put the dog 50px from the left and 20px from the top of the elements box. But what if you want it 50px from the right and 20px from the bottom? Not possible with just straight length values.

But calc makes it possible! The columns themselves bump right into each other and the columns are made by internal padding inside those columns. You could remove half the gutter from both if you wanted to keep the proportion more accurate.

Now you have two true columns separated by fixed space without needing parent elements or using the internal padding. Speaking of columns, sometimes division math gets messy. Not exactly magic numbersbut difficult to understand at a glance. If you want to replicate what box-sizing does, you could use calc to subtract the values as needed.

I think it will be interesting when we can use the attr function in places other than the content property. With that, we could yank the value from HTML elements, run calculations on them, and use the new numbers to do design-y things. Like colorize inputs based on the numbers they contain. Perhaps something like:.There are plenty of situations where we might want to change the font-size property of an element as the screen width changes.

css calculate height dynamically

This makes sense. Someone viewing content on a smaller phone screen might be holding the device closer to their face whereas someone viewing that same content on a large desktop screen would be […].

Someone viewing content on a smaller phone screen might be holding the device closer to their face whereas someone viewing that same content on a large desktop screen would be sitting further away. In each case, changing the size of the text can be a helpful tool to improve the overall user experience by improving the legibility of the content. We could do that with media queries! In other words, the font is jumping to different sizes to adapt to various screen sizes rather than responding and recalculating to any screen size.

It makes the browser do the hard work instead of us having to do the heavy lifting of defining and maintaining all of those media queries. One way to get fluid typography is to change the font-size from pixels px to viewport units vw.

Doing so tells the browser to calculate the font based on a percentage of the current viewport width. Browser support is great for the vw unit making it a safe bet for use in most cases. That tells the browser to calculate the size of the font as two percent of the viewport width. In other words, if the browser is pixels wide, then our font is the equivalent of 20px.

But wait! If we use viewport units and calcwe can have the font-size size based on the size of the screen while setting caps on how small and large the font can be. Rather than always being the same size, or jumping from one size to the next at media queries, the size can be fluid and within a defined range.

For example, if we want the our font-size in a range where 14px is the minimum size at the smallest viewport width of px and where 26px is the maximum size at the largest viewport width of pxthen our equation looks like this:.

Heck yeah! That gives us a font-size that resizes itself to the width of the browser while setting caps on the minimum and maximum sizes without managing media queries.

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We could stop there, but the one thing we have not talked about is the vertical rhythm of our text. Sure, the font-size changes with the browser, but the line-height does not. Fortunately, we can apply the same equation to the line-height property to accomplish that goal:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I have something as below. Theoretically, an image above and a div below. The image and the div fits into a full page, in which the div takes the remaining of the image height, in which when the content overflows the height, it can be scrollable.

Keyword: Image with dynamic height, pure css solution And my question is: Is this possible to be done purely by css alone? This can be achieved using flexboxlike so:. Ut interdum at nibh nec ultrices. Vestibulum gravida tincidunt mauris, vitae blandit tellus tempor vel.

Using CSS Calc() to Dynamically Define an Element's Size️ Without JavaScript

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The height property in CSS defines specifies the content height of boxes and accepts any of the length values. Negative values like height: px are not accepted. The height property does not apply to non-replaced inline elements including table columns and column groups. If the height of the containing block is not specified explicitly, and the element is not absolutely positioned, the value of its height computes to auto it will be as tall as the content inside it is, or zero if there is no content.

If the elements content portion requires more vertical space than available from the value assigned, the elements behavior is defined by the overflow property.

When using the keyword autoheight is calculated based on the elements content area unless explicitly specified. This means a value based on a percentage is still that of the elements content area. Similarly, if the height of the container is set to a percentage value, a child elements percentage height is still based on the content area of that child element.

Height can also be used as an animatable property. Frontend Masters is the best place to get it. I think the content area is defined by width and height properties of an element. That sentence in the article is obviously a mistake.

No one has time to proof-read or look at comments on years-old articlesand it already got our click-through…. And how is the height calculated if the height of the containing block is specified and the containing block is absolutely positioned?

A div containing two floating divs, each of height px, the height of the div container is 0. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

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You'll even get little stars if you do an extra good job. You may write comments in Markdown. Want to tell us something privately, like pointing out a typo or stuff like that? Contact Us. Need some front-end development training? Permalink to comment May 31, Permalink to comment June 14, Yup, I am also confused by that statement.

I think that wrong or needs to be phrased better. Colin Q Bang. Permalink to comment April 20, Permalink to comment December 9, Configuring your div elements to the same height on your web page is a fairly simple task to accomplish with the help of a few lines of JavaScript code. Without help from JavaScript, the divs on the page will have different heights based on the content within them.

Setting the height manually is generally not a viable option because predicting the height needed for the content to fit in the div is not going to be known. This is especially true for blog sites where you may have a content and sidebar type of setup. The height of the content div will vary as new blog posts are published. The web page in this example, has various components such as a header, content, sidebar, and footer. As you can see, the main and sidebar div are being placed side by side.

You will notice that there is a area under the sidebar that has no content. The area is represented by the red "x" in our figure. Since our div elements are not configured with a set height, the div elements will be sized according the content they contain.

While we can manually set the height for the divs, this approach will only work well if the divs' content is static in nature. For a website where the content is dynamic, we cannot set the height manually because we may not be aware of how much content will be placed within the div elements.

We will use a few lines of JavaScript code to resize the div elements so that they share the same height on the page. The results we want to achieve are shown in the following figure. In this case, the sidebar div is resized to match the height of the main div. In the JavaScript code below, we will use a conditional statement to determine which div height is greater and resize the div with the smaller height to match the div with the greater height.

If you would like to see this demo in a seperate window, click on this link. Did you find something wrong with the information on this page? Please take a moment to report it to us so that we can continue to improve the quality of the information on this site.

Click here to report an issue with this page. Did you find this useful? Socialize it today. Webpage Example The web page in this example, has various components such as a header, content, sidebar, and footer. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Resize Divs Dynamically We will use a few lines of JavaScript code to resize the div elements so that they share the same height on the page.

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