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Dialog JavaScript
5:41On its own the <dialog> element isn't very useful. However, some JavaScript can make it become more interactive.
I preparation for writing our JavaScript,
I want to remove the open attribute from
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the dialog element and then add an ID
attribute so we can select it later,
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just like the buttons.
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We'll get rid of the open attribute and
type id, dialogWindow.
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Save those changes and
switch over to the app.js file.
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Inside of the app.js JavaScript file,
we already have
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an anonymous function that will
execute when the page loads.
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This is where we'll write
our event based code.
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First, we need to gather the elements
on the page and the variables,
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the dialog window and the two buttons.
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So let’s just type a comment that
says gather page elements and
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we’ll create a variable for
each one and get them by their ID.
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So we’ll create a variable
called openDialog.
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And we'll set that to
document.getElementById.
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And we'll use the same ideas we
did previously openDialog and
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end line semi colon A.nd let's
just copy that two times
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because the next two lines
are going to be very similar.
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Next one is openModalDialog and
same thing with the ID.
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And the last one will be dialogWindow,
and again,
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we're just naming these variables
the same thing as the element IDs.
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Next, we need to create two event
listeners, one for each of the buttons.
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I'll write the one for
opening the dialog window normally first.
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So let's create comment here that says,
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Open the dialog window normally.
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And we'll use a variable, openDialog.
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And we're gonna add
an EventListener to that.
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And we want this to be on a click, and
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we'll execute a function.
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And let's open that up and
make sure we end that line with a ;.
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And inside of here,
we want to access the dialogWindow,
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and on that,
we're going to call the method show.
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This will add an EventListener to
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the openDialog button, so
that when it's clicked,
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the inner function show will execute.
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And it does exactly what it sounds like,
it displays the dialog element on the page
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the same way that it did when we used
the open attribute before in our HTML.
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Now let's copy and
paste what we just did here,
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because we're going to do the same
thing for our open modal dialog window.
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So let's change our code to match that.
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We're going to open the dialog
window as a modal window, and
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then we're going to change the ID
here to openModalDialog, and
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we're still adding an event
listener on click.
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We still want to call function on
the dialogWindow itself to open it.
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But this time instead of just showing it,
we're gonna type showModal.
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So here instead of the show function,
we're using the showModal function.
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And this is a bit different,
it will still show the dialog window.
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But this time the rest of
the page will have a grey,
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transparent overlay that will
block any other mouse clicks.
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Save this file and
let's switch back to browser and
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refresh the page to see this in action.
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Now, when I click the Open Dialog button,
the dialog window appears.
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I can type some input here, and
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then I can click the OK button to
submit the form and dismiss the window.
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Let's open that again and notice
when I click the open dialog button,
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I can still click on these
other page elements.
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Now let's close this again.
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And now, click the Open Modal Dialog.
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It's the same window, but this time the
browser has applied some default styling
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to center it on the page and
add an overlay.
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If you try to click the buttons,
you can't any more.
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Clicking OK will get rid of the dialog.
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Like I said previously, browser support
for the dialog element still isn't great.
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However, you can imagine
how an email sign-up or
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a login form could be placed inside
the dialog window, creating a convenient
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tool for developers, and a common
standard for people browsing the web.
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