text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
selecting a class, selecting
multiple elements as well. | 4,619.37 | 3.3 |
It turns out, there are a
number of other CSS selectors | 4,622.67 | 2.55 |
that we can use too. | 4,625.22 | 1.29 |
So we saw, for example, the
multiple element selector, | 4,626.51 | 3.15 |
like td comma th for selecting
table data but also table headers. | 4,629.66 | 5.26 |
But there's a number of other selectors. | 4,634.92 | 1.67 |
Here is just a sampling of ones. | 4,636.59 | 1.89 |
You can specify like
descendants or children. | 4,638.48 | 2.73 |
So if I only want to style
divs that are inside of tables, | 4,641.21 | 3.78 |
or I only want the style lists
that are inside of certain classes, | 4,644.99 | 4.17 |
I can use these defendant
and child selectors | 4,649.16 | 2.25 |
to add styling and
those particular ways. | 4,651.41 | 2.79 |
And there are a number of other
CSS selectors we can add as well. | 4,654.2 | 3.89 |
And we'll go ahead and
explore a couple of these, | 4,658.09 | 2.05 |
just to give you a sample of how some
of the CSS selectors can actually work. | 4,660.14 | 5.14 |
And we'll start by taking a look
at the descendent selector, which | 4,665.28 | 3.98 |
is used to select all of the
elements that are descendants | 4,669.26 | 3.18 |
of some other element, for example. | 4,672.44 | 2.92 |
So let's go ahead and create a new
file, that I'll call descendant.html, | 4,675.36 | 7.07 |
that again, we'll start
with the same code. | 4,682.43 | 3.15 |
And inside the body of this
page, I want an ordered list | 4,685.58 | 3.36 |
that maybe has a list item
1 and maybe a list item 2. | 4,688.94 | 5.43 |
And it turns out with lists in HTML, you
can nest lists inside of other lists. | 4,694.37 | 5.55 |
Maybe you've seen bullet points where
there's like nested bullets inside | 4,699.92 | 3.09 |
of other bullet points. | 4,703.01 | 1.17 |
I can do that here. | 4,704.18 | 1.11 |
I can add an unordered list and
create a sublist, like sublist item 1 | 4,705.29 | 6.06 |
and sublist item 2. | 4,711.35 | 3.12 |
And maybe down here,
here's another list item, | 4,714.47 | 4.13 |
such as that now I
have a couple of items, | 4,718.6 | 2.05 |
but some that are inside
of an unordered sub list. | 4,720.65 | 3.75 |
Let's go ahead and
open up descendent.html | 4,724.4 | 3.18 |
and see what that looks like. | 4,727.58 | 2.02 |
So here's what we have. | 4,729.6 | 1.01 |
We have a list item 1, list
item 2, another list item | 4,730.61 | 3.09 |
that is probably actually list item 3. | 4,733.7 | 5 |
So we have three items. | 4,738.7 | 1.02 |
But inside of list item 2,
I have an unordered list. | 4,739.72 | 3.81 |
Let's imagine, for example,
that I wanted to only style | 4,743.53 | 4.59 |
these sublist items
as a particular color. | 4,748.12 | 2.93 |
That maybe I want those
to be blue, for example. | 4,751.05 | 3.05 |
If in the style section
of my web page, I | 4,754.1 | 2.81 |
say that I would like for all list
items to be styled blue, well then-- | 4,756.91 | 5.73 |
not styled, colored blue rather-- | 4,762.64 | 2.52 |
then what I'm going
to see when I refresh | 4,765.16 | 1.95 |
the page is that all of the
items are going to be blue | 4,767.11 | 3.75 |
instead of just the two sublist items. | 4,770.86 | 3 |
But I could instead say that, you
know what, I only want list items that | 4,773.86 | 4.65 |
are children of unordered lists. | 4,778.51 | 2.49 |
And I can do direct children
using this greater than symbol | 4,781 | 2.46 |
to say that only if there is a ul that
immediately contains an li within it, | 4,783.46 | 5.23 |
then I would like for
that to be colored blue. | 4,788.69 | 3.12 |
And now, if I refresh that, now you'll
see that the ordered items, list item | 4,791.81 | 4.19 |
1, 2, 3, those do not get
colored, but only the list items | 4,796 | 4.14 |
that are inside of the
unordered list that | 4,800.14 | 1.95 |
are directly children
of that unordered list | 4,802.09 | 2.88 |
actually get the CSS styling applied. | 4,804.97 | 2.94 |
This greater than symbol here is
specifying immediate children. | 4,807.91 | 4.37 |
I could get rid of it, ul li, like
this, and this would also work. | 4,812.28 | 3.73 |
You still see sublist item 1 and 2. | 4,816.01 | 2.24 |
But this is a more general selector
called the descendent selector | 4,818.25 | 3.55 |
that selects all descendant elements. | 4,821.8 | 1.89 |
So they might not be
the children elements. | 4,823.69 | 1.8 |
They might be grandchildren
element, so to speak, | 4,825.49 | 2.34 |
if those children elements
have other children that | 4,827.83 | 2.76 |
are attached to them as well. | 4,830.59 | 1.3 |
Again, for all of this,
it's helpful to begin | 4,831.89 | 1.88 |
to think about things in terms of
that Document Object Model, that DOM | 4,833.77 | 3.9 |
structure, that tree that represented
how all of our various different HTML | 4,837.67 | 4.77 |
elements are related to one another. | 4,842.44 | 3.77 |
So next up, we can begin to take a
look at some of the other selectors | 4,846.21 | 2.92 |
that we have access to. | 4,849.13 | 1.48 |
So one of the selectors
might be something | 4,850.61 | 2.24 |
like modifying only on a specific
attribute of a particular HTML element. | 4,852.85 | 5.91 |
So we can use the attribute
selector for that. | 4,858.76 | 2.92 |
I'll create a new file called
attribute.html, where here, | 4,861.68 | 5.04 |
let's go ahead and
create a unordered list. | 4,866.72 | 5.1 |
That's going to have a
number of different links | 4,871.82 | 2 |
to various different websites. | 4,873.82 | 1.62 |
So here's a list item that is
going to be a link to Google. | 4,875.44 | 3.93 |
So I'll link to google.com
and say, Google. | 4,879.37 | 3.99 |
And I'll go ahead and add
a link to facebook.com. | 4,883.36 | 3.84 |
Call that Facebook. | 4,887.2 | 2.04 |
And I'll go ahead and add a link
to amazon.com and call that Amazon. | 4,889.24 | 6.06 |
And let's imagine for a moment that I
only wanted to style the Facebook link, | 4,895.3 | 4.09 |
like I want to really
highlight the Facebook link, | 4,899.39 | 2.09 |
tell people to click on
that one as by coloring it | 4,901.48 | 2.59 |
in entirely different color. | 4,904.07 | 2.3 |
Well, to style things
normally, I would say something | 4,906.37 | 3.15 |
like links should be colored,
you know, blue, for example. | 4,909.52 | 4.25 |
They're colored blue by default,
but I could be explicit about it | 4,913.77 | 2.71 |
and say, links should
be color blue like, | 4,916.48 | 1.7 |
such that now when I
open up attribute.html | 4,918.18 | 3.95 |
all the links are colored blue. | 4,922.13 | 2.96 |
But I could also say,
I would like links that | 4,925.09 | 2.73 |
have an href attribute of
facebook.com, I would like | 4,927.82 | 5.55 |
those links to be colored red instead. | 4,933.37 | 4.86 |
So this square bracket
notation I can use | 4,938.23 | 2.07 |
to specify a particular
attribute of an HTML element. | 4,940.3 | 3.57 |
Only anchor tags, a tags, who's
href is equal to facebook.com, | 4,943.87 | 3.89 |
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