text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
property of an HTML element called it's | 3,483.48 | 5.04 |
a data set property and then I can say | 3,485.97 | 4.8 |
something like button data set | 3,488.52 | 4.95 |
color to get at the data - color | 3,490.77 | 5.85 |
attribute so a lot of stuff going on | 3,493.47 | 4.29 |
here let's go ahead and try and read | 3,496.62 | 2.79 |
through this entire thing and just get a | 3,497.76 | 2.88 |
feel for what's happening because we | 3,499.41 | 2.91 |
have functions nested within other | 3,500.64 | 3.42 |
functions nested within other functions | 3,502.32 | 4.56 |
up at the very top I said add an event | 3,504.06 | 4.77 |
listener to the document when the | 3,506.88 | 3.99 |
documents Dom content is loaded meaning | 3,508.83 | 3.6 |
all of the content of the page is done | 3,510.87 | 3.96 |
loading go ahead and run this function | 3,512.43 | 5.4 |
this is the body of the function so what | 3,514.83 | 4.32 |
do I want to do when the page is done | 3,517.83 | 3.48 |
loading I'm going to document dot query | 3,519.15 | 4.65 |
selector all looking for all of the | 3,521.31 | 4.74 |
buttons and if I wanted to if there | 3,523.8 | 3.81 |
could be more buttons I could have added | 3,526.05 | 3.24 |
a class to these buttons and just look | 3,527.61 | 3.36 |
for things of the particular class query | 3,529.29 | 3.3 |
selector all just returns all of the | 3,530.97 | 3.48 |
elements that match a particular query | 3,532.59 | 5.4 |
and then I'm saying for each of those | 3,534.45 | 5.13 |
buttons for each of the buttons that | 3,537.99 | 3.93 |
came back I would like to run a function | 3,539.58 | 4.5 |
on each of those buttons I'm basically | 3,541.92 | 3.66 |
saying if I have three buttons that came | 3,544.08 | 3.36 |
back let me run a function on the first | 3,545.58 | 3.48 |
button then the same function on the | 3,547.44 | 3.39 |
second button then the same function on | 3,549.06 | 3.57 |
the third button and what is that | 3,550.83 | 4.2 |
function well it's this function here a | 3,552.63 | 5.16 |
function that takes as input the button | 3,555.03 | 4.41 |
its first gonna pass in as input the | 3,557.79 | 3.45 |
first button then the second button then | 3,559.44 | 4.47 |
the third and what this function does is | 3,561.24 | 5.55 |
it adds an onclick handler to the button | 3,563.91 | 5.28 |
it says when the button is clicked on go | 3,566.79 | 4.26 |
ahead and run this other function and | 3,569.19 | 3.9 |
this function now is the function that | 3,571.05 | 3.93 |
will run when the button is clicked on | 3,573.09 | 4.38 |
to say when the button is clicked on get | 3,574.98 | 5.84 |
me the hello element change its color to | 3,577.47 | 6.99 |
button dataset color and button dataset | 3,580.82 | 5.95 |
that color takes a button takes an HTML | 3,584.46 | 4.68 |
element like this one here and accesses | 3,586.77 | 4.47 |
its data set all of its data properties | 3,589.14 | 5.37 |
and specifically accesses the color data | 3,591.24 | 5.1 |
property which in this case is equal to | 3,594.51 | 3.45 |
red and that is what we would like to | 3,596.34 | 4.98 |
set color equal to so a little bit more | 3,597.96 | 4.41 |
complexity we've seen before | 3,601.32 | 3.81 |
but now we've been able to reduce what | 3,602.37 | 5.16 |
was three different event handlers into | 3,605.13 | 4.74 |
just a single one and now this is going | 3,607.53 | 4.14 |
to work the same way change it to red | 3,609.87 | 4.8 |
blue and green all by just using those | 3,611.67 | 4.83 |
data properties that we have access to | 3,614.67 | 3.96 |
and so when in doubt about how these | 3,616.5 | 3.48 |
things are working about what query | 3,618.63 | 3.09 |
selector is returning the JavaScript | 3,619.98 | 3.21 |
console can be a very powerful tool for | 3,621.72 | 2.79 |
this so you can go into the JavaScript | 3,623.19 | 1.89 |
console | 3,624.51 | 2.49 |
and actually manipulate things you can | 3,625.08 | 4.02 |
running run queries you can run | 3,627 | 3.78 |
functions you can even modify their | 3,629.1 | 3.66 |
values of variables like if I go back | 3,630.78 | 5.49 |
for instance to counter dot HTML or head | 3,632.76 | 6.27 |
this counter that's counting 0 1 2 3 4 | 3,636.27 | 5.22 |
if I wanted to I could say something | 3,639.03 | 6 |
like counter equals 27 just like change | 3,641.49 | 5.85 |
the value of the counter nothing appears | 3,645.03 | 3.96 |
to have changed on the page I didn't say | 3,647.34 | 3.96 |
update anything on the page but now next | 3,648.99 | 4.02 |
time I run count it's going to update | 3,651.3 | 3.9 |
the value of the count to 28 because I | 3,653.01 | 3.84 |
had updated the value inside of the | 3,655.2 | 3.3 |
JavaScript console it's going to | 3,656.85 | 3.66 |
increment that value display that value | 3,658.5 | 4.53 |
inside of the h1 element so you can | 3,660.51 | 4.26 |
modify variables that you can run | 3,663.03 | 4.56 |
functions you can run document query | 3,664.77 | 4.23 |
selector to figure out what particular | 3,667.59 | 3.3 |
elements are going to come back all | 3,669 | 3.27 |
through the use of the javascript | 3,670.89 | 3.33 |
console which can be a very very | 3,672.27 | 3.81 |
powerful tool especially as you begin | 3,674.22 | 3.99 |
working on trying to debug these | 3,676.08 | 4.32 |
programs and trying to figure out what | 3,678.21 | 4.26 |
might be wrong with them it turns out | 3,680.4 | 3.51 |
too that there are other changes that we | 3,682.47 | 3.09 |
can make in order to optimize our code a | 3,683.91 | 3.03 |
little bit more in order to make it a | 3,685.56 | 3.33 |
little bit more succinct and one way is | 3,686.94 | 3.18 |
that in more recent versions of | 3,688.89 | 2.49 |
JavaScript they've introduced a | 3,690.12 | 3.3 |
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