I am in the process of reworking a simple web site so that it can run on a thumb drive, aka with no server involved.
On a page on the original I had a "select" control that would execute a script that read a file and loaded images and some text.
Since I can't load files from the client's computer, I put all the information on the page, each entry in a separate div, each with a unique id, and am using style.visible = "hidden" and "visible" to hide the ones I don't want to see and show the ones I do.
Problem is, the page stays the same size (length) as if each of the divs was visible, and the space occupied by the divs I have hidden is not released.
How do I get the hidden divs to give up their space?
Here's the original page: https://www.vintagebankantiques.net/people.html
A css rule like
.class-of-divs{
min-width: 100%
}
or possibly
.class-of-divs{
min-width: 100vw
}
should help. Without having a JS fiddle or something it's hard to say more.
What these rules do is say that those divs must all be 100% of the width of the page, and shouldn't change size based on the presence of the other divs.
A problem you might get is that the divs will still get shifted in position by their neighbours. To prevent that, you could try setting display: none instead of visible: hidden. The key difference is that a div with a visibility of hidden still affects page layout. A div with a display of none does not affect page layout.
Related
I'm trying to implement a simple tabs component in a single-page app. The selected tab should (obviously) display its contents while unselected tabs keep their content available but hidden. How should I hide the content on the unselected tabs?
Each of the canonical techniques for hiding content has issues:
technique
drawback
opacity: 0
User can still potentially interact with invisible content. Breaks if a sub-element of the tab element sets the opacity property.
color: transparent, background: transparent
Same issues as above.
display: none
Component on unselected tabs is loaded in a div with no dimensions, which in my experience causes rendering issues when that content is later displayed. (Several React libraries I'm using do not properly calculate inner dimensions of columns or whatnot when they're initially rendered in a display: none div and later displayed.)
visibility: hidden
Still takes up room on the page. Breaks if some sub-element of the tab element sets the visibility property.
To sum up: I want to know how to render content as if it's actually loading on the page (i.e., with the proper dimensions), but completely invisibly, with no space reserved for it on the page and with no possibility of user interaction. Ideally, the solution should be agnostic to whatever CSS properties are set on the arbitrary component within the tab itself; i.e., the CSS inside the tab content should not be able to break the display of the tabs themselves. Is there some recommended combination of CSS properties (visibility, opacity, display, position, z-index, etc.) that does what I want here?
Hey guys I have a fixed background attachment for scrolling uptill two pages of the content after that i want the second page to be fixed and make the third page with a different background to come up covering the second page. How can I make the content of the second page fixed when it comes at the top? So that scroll effect can be appliedm
You have to use Javascript Intersection Observer API. Create an instance of it and set it to observe your 3rd page. On threshold crossing apply the styles you need (like setting position: relative; to both of your pages and then adjusting them via z-index).
Just don't unobserve() on collision so you can roll back changes on, well, scrolling up on your page.
Setup:
So, I have a narrow but long table (width:200px, height:2000px ish). This table is wrapped inside another div with fix height (300px) and overflow-y:scroll, giving a fixed height visible area. In the table, there is a lot of cells that are stacked vertically (see image and markup is simple regular table wrapped in a div).
Problem:
Each cell contains images, so if there are lots of cells that the page has to fetch including the images and data before loading the site then it will slow down the site significantly.
Solution Approach:
I am thinking of two approaches.
Apply lazy-load to images only. In this case (for example, from the image above). all three sections (section 1, 2 and 3) will be fully loaded except images that are not visible yet. Although it will minimize the delay if it has to fetch lots of data (for example 100+ cells), then I am not sure if it is the best approach.
Another approach is little bit more complicated but will minimize the delay as much as possible and is really ideal. So, when the page is first loaded, only the section-1 will be visible but section-2 will be also loaded (either with images or lazy-loaded images. Howeversection-3will not be loaded at this point.
When the user scrolls to thesection-2then thesection-3will be automatically loaded but not visible until user scrolls down. Ifsection-3is in the viewpoint, thensection-4` will be loaded but not visible. You get the point.
Any thoughts on it and how-to?
Thanks.
Do both. Make sure your images are always being lazy loaded, and only get the data for the next section when the user is scrolling and gets close to (or at) the bottom.
I use a lazyload image system where I specify my images like this:
<div class="lazyimg" data-src="path/to/image">
</div>
I give .lazyimg a width and height and then, when it scrolls into view, I load data-src and set background-image on the .lazyimg element.
This only works if you can specify a size independent of the actual image size, background-size: cover|contain are your friends here.
EDIT
Alternatively I guess you could load the image and then pop it in the DOM as an img tag, but changing the dimensions of the element could affect any sibling layout which could appear somewhat jarring, even if smoothly animated.
How to do it: onscroll callback.
I basically have a fixed width DIV with an unordered list inside that overflows to the right of the DIV when the list is too large. It basically looks like this:
http://i.imgur.com/Tr36X.jpg
Each list item (basically a 60x60 image) is clickable and it leads to a page with the same DIV element and same list items, except one is highlighted a different colour to show it's the current image. What I'm trying to do is get the one that's currently selected (it has a class="active" attribute) to show in the middle of the scrolling DIV, like so:
http://i.imgur.com/YtF1y.jpg
The only way I can think of doing it would be to have a Javascript file included on the page to find what list item has the class="active" attribute, and then scroll along to it using Javascript. Problem with this is, it won't initially be scrolled to the correct position when the page loads, the user will see it "jump" into position when the Javascript loads and gets executed.
Is there a way to do what I want without Javascript? I don't mind a little bit of markup and CSS hackery if need be.
Thanks!
I doubt that this can be solved only with CSS and HTML. Unless you use some other language (like PHP) that can generate you an HTML with changed order of DIVs.
But, I can solve your Javascript "jumping" problem.
You initially show your DIVs with css style="display:none;"
Do the scrolling with JavaScript (and other stuff like changing order of DIVs if needed).
Set css style="display:block;"
i.e. items will show up on the screen already scrolled.
I tried googling, but didn't come up with much. I'm building a horizontal carousel which displays images in a LI, floated. The issue I want to solve is, everytime I add thumbnails to the carousel (I'm lazy loading), I need to recalculate the width of the carousel (so that all the floated thumbnails line up nicely side by side).
For one, I rather not have to do these kinds of calculations in JS, and for two, I found that it's hard to find a cross browser way to ensure that the width will be properly calculated (I end up having to add or remove pixels from the total width depending on the browser).
So my question is, is there any way without JS, to be able to add content to a div, and have the width adjust as needed, the same way a div's height would?
And if not, have you found a more efficient way to handle this scenario than recalculating the width every time?
I'm not new to web dev, and for as long as I've been in this field, to my knowledge this has never been possible. But with the advent of new technologies cropping up, I thought maybe there was an obscure way of achieving this now.
Thanks in advance!
[EDIT] (for clarification, but simplified): If my carousel is 500px wide with overflow hidden. There's a slideable section containing thumbnails, each is 100px wide, floated, they fit 5 across in the carousel. When a user clicks Next, it lazy loads the next set of 5 thumbnails, and appends it to the slider area after the first set of 5. But since this div was 500px wide to accommodate 5 thumbnails, adding another 5, I need to recalculate the width to get the new thumbnails to show up side by side. Ideally I'd like to find a way to have the div autoresize its width to fit horizontal content, the same way it naturally does for vertical content.
I've found that using a containing carousel div with white-space: nowrap and overflow: hidden has worked. I then have display: inline-block for each item in the div.
Using this class for each individual item:
.eachItem {
display: inline-block;
}
Will work (I've done something similar to that).
The problem is that in IE7 it won't work! and you'll have to use JavaScript anyway :(
EDIT: I meant inline-block... and as you may know, IE7 doesn't "like" it.