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press submit and alright foo now shows
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up I type in something like a right to
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leave that type in bar bar now shows up
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I'd have been Baz Baz no shows up now
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one minor user interface annoyance is
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that it seems that every time I submit a
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new task this input field retains the
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value of what it used to be and that's
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probably not what I want because I'd
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rather it just clear out I've already
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submitted the task no need for it to
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stay there but that's easy to manipulate
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in JavaScript if I want to clear out
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this input field the input field whose
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ID is task then all I need to do is say
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document dot query selector task get me
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that input field change its value equal
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to the empty string equal to nothing
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just to say clear out the value of what
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happens to be inside of that input field
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right now and now if i refresh the page
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type in foo press submit input field
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clears out and now I can type in
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something like bar and then something
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like Baz to continue to add tasks as
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well now one thing that might be
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slightly annoying is that I'm not
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careful if I press submit well it
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submits the empty string is a task and
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so I just get this empty bullet point
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that shows up here nice press submit and
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I just get all of these empty bullet
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points it might be nice from a user
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experience perspective
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if I were to not allow the user to do
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that not allow them to submit a task if
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they haven't actually typed something in
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to the new task field and we can do that
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just by modifying properties of elements
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that it turns out that HTML elements
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have a property called disabled that can
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be true or false that allows us to
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disable something like a button so if I
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want to disable the submit button one
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thing I might want to do first is give
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this submit button an ID I'll give it an
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ID of submit so that in my JavaScript
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code I can reference the submit button
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and now inside of this JavaScript code
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when the Dom content is loaded by
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default the submit button should be
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disabled like when I first load the page
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I don't want the submit button to be
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enabled because I want the user to type
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in a task first before I enable the
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submit button so how do I do that well I
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can document query selector get me the
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element whose ID is submit get me that
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submit button and just said it's
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disabled property equal to true
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javascript has boolean values true and
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false I set the disabled value equal to
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true to disable the submit button now if
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i refresh the page I can type in a new
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task but the submit button is disabled
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it doesn't do anything now obviously I
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don't want to keep it that way I'd like
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it such that as I begin to type things
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in then the submit button stops being
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disabled disabled get set from true to
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false instead and so what I really want
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to do is listen for me like pressing
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keys on the keyboard and so the way I
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can do that is by adding yet another
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event listener document query selector
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what I want to add a query selector to
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what do I want to add an event handler
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for well I want to add an event handler
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for when I type something into this
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input field and this input field has an
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ID of tasks so let me go ahead and get
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the input field the element whose ideas
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tasks and add an on key up handler on
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key up again is the event when I lift my
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finger off of a key go ahead and run
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this function and what should the
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function do well it's going to say
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document query selector submit set the
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disabled property equal to false
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and so now here's what we're doing we're
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saying by default when I first load the
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page take the submit button and disable
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it said dot disabled equal to true then
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anytime I type a key and my finger comes
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off the key that means on key up is the
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event that gets triggered run this
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function and what the function is going
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to do is take that same submit button
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and set its disabled property equal to
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false so now instead of being disabled
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