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call an anonymous function a function
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4.71
that has no name but I'm still passing
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4.32
it into the add event listener function
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4.47
as an argument because I want to run the
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4.89
code inside of the function once the Dom
2,113.26
4.38
is done loading and so inside of curly
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4.17
braces then is the content of that
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3.81
function the content of what code should
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3.75
run when the Dom is done loading and
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3.81
then at the end I again used just this
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3.84
end parenthesis where that end
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3.54
parenthesis lines up with this
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4.17
parenthesis here this is enclosing all
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5.07
of the arguments to add event listener
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3.96
where the first one is Dom content
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3.9
loaded and the second one is this entire
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4.86
function that might span multiple lines
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4.35
so you'll see syntax like this quite a
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5.1
bit in JavaScript but now what I want to
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5.28
do is adding the event listener to the
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4.32
button I can go ahead and just for place
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4.77
and put it here and it turns out that if
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3.15
I wanted to
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2.37
instead of saying dot on click equals
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2.97
count you could
2,154.54
2.579
used the same syntax of add
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2.67
eventlistener I could say at
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5.071
eventlistener click and then count to
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6.57
mean when the click event happens go
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4.5
ahead and run the count function but you
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3.45
can equivalently shorthand this and just
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4.35
say dot on click equals count and that
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5.25
would work just as well so now what
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4.799
we're saying here is that wait until the
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3.75
Dom has done loaded wait until all the
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3.811
content on the page is loaded and then
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4.29
go ahead and run this function and what
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3.719
the function is going to do is it's
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3.75
going to add the event handler to this
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4.171
button and that'll work because now
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3.929
we'll be able to find the button because
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3.87
now all of the content of the Dom has
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5.191
loaded so now if I go back Refresh
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5.25
counter dot HTML you'll notice that the
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4.049
JavaScript error goes away I don't seem
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4.53
to have that error anymore and now if I
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4.411
press count were able to see the count
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5.55
increment just as before as well and so
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5.849
this then is an improvement upon what
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4.16
I've had before where now I'm able to
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5.041
separate out my JavaScript code from all
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5.469
of the rest of my code as well but much
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4.74
as in the case of CSS where we were able
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4.021
to take CSS that was originally located
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3.78
in the head of our page and move it into
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3.719
a separate file you can do the same
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3.3
thing with JavaScript too and this can
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3.031
be helpful if you have multiple people
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3.03
working on different files you want one
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3.66
person working on the HTML and someone
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4.109
else working on the JavaScript it can be
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4.2
helpful if you expect that one of these
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3.331
things is going to change more
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2.52
frequently than the other so you might
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3
not need to load the other one as often
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3.96
so there can be value in separating our
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4.59
HTML code from our JavaScript even more
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4.35
and by moving our JavaScript into a
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4.23
separate file and so in order to do that
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5.279
I can create a new file that I'll just
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5.91
call counter j/s which will contain all
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6.061
of the JavaScript for my counter HTML
2,253.93
6.03
file so in order to do that what I can
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5.22
say is let's go ahead and copy all of
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4.83
this JavaScript code go ahead and cut it
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4.469
out of this page and I'll paste it into
2,264.79
3.9
counter j/s remove some of that
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6.151
indentation so now I have a file called
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6.63
counter das that just contains all of
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4.68
the JavaScript I want to run on my
2,275.32
6.42
counter dot HTML page and now rather
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5.82
than include actual JavaScript in
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4.65
between these script tags what I can say
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6.599
is script SRC SRC first
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8.31
equals a counter Jas for example if I go
2,290.109
7.47
ahead and reference counter Jas and use
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5.49
that JavaScript in the head of the page
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4.47
here and that then is going to work
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3.72
exactly in the same way I still am able
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3.78
to count as high as I'd like I still get
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3.24
an alert every time the count reaches a
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3.601
multiple of ten but my HTML is now a
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3.929
little bit simpler it's just the body
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3.75
it's just the h1 in the button and then
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5.191
all of my javascript is now located in a
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5.82
separate file that allows me to do that
2,316.27
5.01
allows me to keep my HTML code and my
2,319
3.599
JavaScript code separate from each other
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3.24
and that can be value for valuable for a
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4.081
couple of reasons among them if I have
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4.68