There is margin-left, margin-right, margin-top and margin-bottom. But is there also a margin where you can margin from the center of the page ?
Imagine I want to build everything from the center with the help of angles or something like that:D Is that possible ?
As far as I know, if only using the features and functions of CSS, it is impossible.
HTML rendering process is like:
draw some horizontal lines to divide the top-down areas.
put some boxes into each area by floating left or right.
with some other special controls like relative position ...
If you really want to do that, you need to use JavaScript to handle it manually. You need to control the absolute positions for all the elements, calculate and reset them when some elements changed.
Related
I want to make a carousel-style widget that is built with 3 images and two buttons.
My problem is that this whole thing needs to be responsive and scale up (to some maximum) and down, while keeping the relations between the images.
The shape is as follows:
The pixel sizes of the images are all known upfront, and any relation that is needed can be known upfront (e.g. the amount needed to move the green and blue boxes since they are not vertically centered).
I am not very experienced with HTML/CSS, and I managed to get this shape with flexboxes and translations, but I could never manage to get it to scale correctly with the rest of the page.
I don't quite understand if this is even possible with CSS, since it requires some sort of absolute positioning / translations / etc. that ruin its box model.
The next thing I thought of trying is to use a canvas instead and draw the images myself, while letting the canvas width to stretch as it wills (up to a maximum) while I control the height in JS, since I know the aspect ratio of the widget.
I would really prefer a simpler HTML/CSS solution though.
I suppose I could do the same without a canvas - a container that is controlled by CSS for width, but I control its height, and the images/buttons could all be absolutely positioned in it, but that's kinda weird as well.
Your goal can be accomplished by using percentage-based width values (heights being auto or unset) for the images at different CSS breakpoints (e.g. Bootstrap's listed at https://getbootstrap.com/docs/5.0/layout/breakpoints/). Practically from an aesthetic standpoint, I suggest setting buttons to pixel values (again, differing at breakpoints). Either a container (like a div element) or the body element will be the parent element to which your images and buttons scale.
To accomplish overlapping of images (and horizontal alignment of buttons mentioned in the next paragraph), for all elements you'll need to set z-index, which indeed does require either absolute or fixed positioning. Given your elements will be either absolute or fixed in position, you could modify vertical positioning using the top property.
Give the three images auto left/right margins. Set the buttons to the same z-index as the green image so that they'll rest against the green image. Give the L button a left margin of auto and right margin of 0. Give the R button a left margin of 0 and right margin of auto.
No JS required with this solution, as you'd prefer.
With position: absolute, you place an element by defining one of it's corners (often using the top and left properties). Is it possible to place it by defining it's center? (without knowing it's width/height?).
I have answered a similar question with this jsFiddle link
Link to the similar question with my answer: Position the center of an image using css
You can then use top/left coordinates using pixels, and it will use the center of your object no matter which width/height and this may be dynamic fit to content. One problem may be you need to set some z-indexes and styles so the other wrapper divs won't bother the rest of your content, this may be a drawback to use this approach.
The solution lies in the fact to use a wrapper div, with the real positions, and within that another wrapper div containing styles: position: relative;padding-top: 25%;margin-top: -100%;margin-left: -100%;. The margin-left style will apply easily, but the margin-top needs the padding, hence the extra wrapper div.
If you want another approach, you will have to use Javascript I suppose.
I'm doing a scaleY on a div, and though visually it is working the way I want, the page is still acting like it is it's original height. I'm shrinking it, and don't want empty space above and below it. I know I can probably hack this together with negative margins or something but I'm wondering if there is a better way like I don't know about to have the page naturally collapse into the freed up space from the transform.
Thanks!
CSS transforms do not change the layout of the page, so all elements with transforms will take up as much space as it does without a transformation on it. That is the beauty of transformations. If you want to shrink the element, and have the page change then you will want to use the height CSS on the element.
so what I'm trying to do basically is have the HTML document extend vertically as I add more text, and at the moment it's just giving me some really weird problems, such as:
The body won't extend downward as I add more text
The footer isn't displaying at all at this point
There are some weird symbols being inserted into the document
The only way I know how to position things is absolute, and I don't know if this is causing some problems (such as getting text under the "Home" image?)
Here's the jFiddle: http://jsfiddle.net/9nYgb/
Any help is appreciated greatly, thank you!
Absolute positioning does tend to cause problems like that. Relative positioning is simple ... instead of using the top-left corner of the document as the origin for reference, the top-left corner of where the element was supposed to be is used as a reference. So <div style="position:relative;top:10px;"> will result in the element being 10px below where it would have been had no style information been provided.
When you position elements absolutely, you take them out of the document flow. This means that other elements will act as if they aren't there. It's good for placing a modal popup div on top of a page, but it's not good for laying out a whole page.
In general, when it comes to laying out a page, I try to stick to a series of divs with height and width set. You can use margin and padding to adjust layout, and float to make items stack up horizontally to one side or the other. Sometimes I also need to set a div's display to inline or inline-block to get them to appear next to one another and act like inline elements. You can also place divs within divs to group elements together and treat them as one by manipulating the outer container(s).
In general I don't find much need for absolute positioning in a page layout.
How positioning can save our time if we use in place of float on some place in layout coding?
How we can judge where positioning would give better result?
For example (i added just for example) if this is a design
So far i only use float + margin + padding, now if i can mix positioning and save time and get pixel perfection easily then float.
Guide me
Thanks in advance.
Update 1:
these are common elements of website. should i use positioning for any of them?
The Header
---logo
---serch box
---The Navigation Menu
---top links
---Breadcrumbs
The Text Area
---Paragraphs
---images( left , right or center align)
---Tables
---vertical ordered and unordered list
The Sidebar
---vertical ordered and unordered list
The Footer
---copyright
---Important Links (horizontal list)
Form elements
Update 2:
Does positioning have any
Compatibility issue(including IE6) than float?
Is positioning is only good for fixed
width design or it's good for both
liquid and fixed?
For that layout, you don't need to use nothing else than floats, margins and paddings. Positioning (relative, absolute, fixed) should be used only in 'special occasions', eg. when you want to lift an element out of the document flow and place it somewhere it would be otherwise hard to place.
You won't save any time and won't get any more 'pixel perfect' results with positioning. You should be able to do that using traditional methods.
The only reason you should use absolute positioning in that layout is because of the RSS icon, that's a 'special occasion' I was talking about.
Looking at the design there is minimal need to using positioning, the only I can see it may be need is t give the overlapping effect on the RSS icon but even then you could do some trickery with background images to give the effect that it is overlapping.
On my sites I use position if I need to give the user the experince that elements overlap outside of the box model. Otherwise you should be fine floating, padding and using margins.
One tip howerver if you are using position:absolute; make sure the parent element has position:relative;