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there followed by an exclamation point
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5.49
so I've extracted the name from the form
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get me the input field where they type
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to the name get access to its value and
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then I'm displaying an alert that is
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5.401
going to say hello to that person for
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example and so now for refresh the page
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I type in my name I press submit I get
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an alert that says hello Brian
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4.859
press ok I can try it again I can type
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in something like David it press submit
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and now the page says hello David
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so here again we've been able to combine
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event listeners and functions and query
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5.31
selector to be able to both read
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4.351
information from the page in order to
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say get me
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3.36
this particular HTML element find me an
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4.71
HTML element and access like what the
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4.02
user typed into it the dot value
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property that gets me what the user
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typed into an input field and we've been
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3.57
able to combine that with event
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listeners and alerts that are able to
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4.14
actually respond dynamically to when a
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4.5
user submits the form or when the entire
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3.99
content of the page is done loading in
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order to produce some interesting
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4.8
effects as well but it turns out we can
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do more than just change like the HTML
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that is contained within an element we
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4.74
can also change CSS as well change the
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4.62
style properties of a particular element
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as well so let's go ahead and see an
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4.89
example of that I'll go ahead and create
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a new file then I'll call colors HTML
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and inside of colors I'll include the
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same standard HTML boilerplate code that
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we often start with a head section with
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a title and a body section and inside of
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5.4
the body of this page I'm going to
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5.58
display a heading that just says hello
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5.61
for example and maybe I'll give it an ID
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4.38
just so I can reference it by name maybe
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5.34
it has an ID of hello and then I'll have
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6.15
three buttons I'll have a button called
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6.54
read a button called blue and then a
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button called green for example where
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7.14
now if I open up colors dot HTML here's
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5.76
what I see I see a big heading that says
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4.2
hello and then I see three buttons red
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blue and green but of course right now
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3.9
these buttons don't actually do anything
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how do I get the buttons to do something
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well that's where JavaScript's going to
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3.99
come in I'll add a script tag to the top
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4.35
of my page and I only want to run this
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4.05
JavaScript when the Dom is done loading
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so again we'll use the same syntax as
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before document dot add eventlistener
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7.14
Dom content loaded and then run this
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6.1
function to say everything in between
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4.44
these curly braces this is all the code
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4.05
that should run once the page is done
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3.81
loading and what I'd really like to do
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4.2
is get at these three buttons and say
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3.48
when you click on each one of them do
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2.55
something different like change the
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3.93
color of a particular HTML element and
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4.29
in order to do that I need some way of
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3.63
uniquely referencing these buttons so to
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3.18
do that I'm going to give them all IDs
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3.78
this button will have an ID of red this
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button will have an ID of blue this
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button will have an ID of green
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unique names I can give to the buttons
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in HTML such that in JavaScript
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I'm later able to reference them so what
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I what do I include now here inside of
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3.18
my JavaScript code
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4.5
well let me say document dot query
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8.13
selector hash read to say get me the
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element whose ID is read and when you're
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6.27
clicked on on click go ahead and run
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this function
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what should the function do well I want
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to take this h1 element and change its
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5.04
color to red I want to change the font
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color to red and I'll leave a comment to
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myself in JavaScript the way you can
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leave a comment just a document what
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3.24
you're doing is using these two slashes
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the two slashes indicate everything
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after that on the page is going to be a
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comment browser will ignore it but it
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3.78
can be useful to use a programmer and to
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someone who's reading your code to be
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able to see what it is that you're
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4.29
describing here on the page and now what
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I'd like to do is document query
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