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The Implementation Guide for Js 511g Application Form

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Guide of Js 511g Application Form

[Music].this video is sponsored by dev Mountain.if you're interested in learning web.development iOS or UX design dev.Mountain is a 12-week design and.development bootcamp intended to get you.a full time position in the industry to.learn more visit dev mountain comm or.click the link in the description below.hey what's going on guys so in this.project we're gonna be building a.vanilla JavaScript book list so that we.can add books and delete them and we're.not using any frameworks we're not using.jQuery or any libraries it's just.straight vanilla JavaScript and we're.actually gonna write our code in an.object-oriented fashion with classes.using using es6 classes so we'll have a.book class because we're adding books.here we're gonna have a UI class that.has to do with displaying UI doing.things in the UI like alerts we're also.gonna have a store class because we're.saving our books to local storage in the.browser okay and just to give you an.example of how this works it's very.simple will just say book one author.John Doe and let's say whatever just.some number for the ISBN and submit and.we get a little alert that says book.added you can see it gets added to the.table down here we can add another one.we'll say book to say Jane Doe number.and submit and that book gets added ok.and then we can go ahead and delete a.book and you see book removed and the.alert will go away after three seconds.and that's pretty much it now there's.there's tons of talks about frameworks.and our tutorials on frameworks like.react and view but something like this.you really don't need a framework it's.very very simple you don't even need.jQuery or a library or anything like.that.we're just interacting with local.storage where we're dealing with events.and of course we're gonna be creating a.couple classes now you could put each.class in its own file and you could use.something like web pack or parcel to.bring all your modules in but we're just.going to do everything in one app J's.file just so we don't have to deal with.any compiled.or anything like that so this should.really sharpen your vanilla JavaScript.skills which are very important you know.a lot of people jump into frameworks too.early so let's get started I don't want.to talk too much longer because this.could be a long tutorial but we're going.to start off by just creating the UI and.I know it's just HTML and bootstrap but.I like to do it start to finish you know.I don't like to just jump in and say and.we're starting from here I want to start.with a clean slate so index.html app.t.j.s those are the only two files we.need we don't even need a stylesheet.because we're gonna let bootstrap do all.the work for us.so let's go ahead and put in our.boilerplate here our head body tags and.for the the title I'm just gonna say my.book list that's the name of the.application I'll say my book list app.and for bootstrap I'm actually gonna use.something called boots watch so boots.watch comm and there's a bunch of.different themes here what did I use I.used Yeti so and you can use a different.one if you want but I'm gonna go to Yeti.download and I'm just gonna grab the URL.of this this stylesheet and then we'll.go ahead and put this in here and the.next thing we need is font awesome so.let's go to font awesome comm start.using and then we'll grab that.stylesheet here and put that right above.bootstrap okay so we'll save that good.now what I'm gonna do is open this this.HTML file with live server which is an.extension that I'm using for vs code you.can just click on this icon and search.for a live server if you want to use.that or you can just open it with your.your file system where you have.something running on that poor one.second guys.[Music].you can see it's a sandbox this is from.my HTML CSS course that I'm creating.alright so let's go ahead and open this.up so we just have a blank blank page.here and we're going to just quickly add.the add the.HTML so I want a container around.everything and I'm gonna add a class of.mt - four because that's gonna it gives.it margin top it's just going to bring.it down a little bit and then inside.there let's have an h1 I'm gonna give it.a class of display - four which is a.bootstrap class and we're gonna say my.book list but the word book I want to be.a separate color so I'm gonna put a span.around it with a class of text - primary.and these are just all bootstrap classes.I do have a bootstrap course on you - me.if you're interested in learning more.about bootstrap but I'm just going to.put that span around the word book and.let's see right before that inside the.h1 right before the word my I'm going to.put the font awesome icons so I'm going.to do I with the class of let's see it.was FA our FA s we also want a class of.FA - FA - open or is it book - open.alright so let's go ahead and save that.there we go.let's also add a Tech Center class to.the h1 so text center there we go and I.also want the icon to have that primary.color so I'm going to give also give the.oops I'm gonna give the icon or is it a.class of text primary and save there we.go.ok so next thing we want to do under the.h1 is put our form and our form is going.to have an ID of book - form we're gonna.be using that in the JavaScript we don't.need an action we're not actually.submitting to server or anything like.that and in our form here let's do a.form group class and we'll have a label.for the title ok and then we'll have an.input and this input is going to have an.idea of.title it's gonna be type of text and.let's also add a class of form control.okay so if we save that we get a nice.little input now what I'm gonna do is.just copy the form group this whole div.right here we'll just go ahead and copy.that down twice and the second one is.gonna be author okay so I'm gonna grab.this this four as well as this ID just.ctrl D we'll do that and then we'll.change this to author and let's see we.also have the is be n number and we'll.grab these to change them to ISBN okay.and then we need our button so under.this last form group let's say inputs.let's give it a type of submit and the.value will say we'll say add book and.then let's give this a class a couple.bootstrap classes BTN BTN primary and.BTN block which will make it reach all.the way across and save there we go.so under the form here we're gonna have.our table and actually I want to give.this table a class of table and a class.of table - striped okay and then we're.gonna put in our headings our table.heads so let's put a tea head and inside.here let's do a tea our table row and.then we want our headings so th the.first one is going to be title and we'll.go ahead and copy that down three more.times we want title author and then we.want our ISBN number and then the last.one is just gonna be blank because.that's where the delete button is gonna.go it doesn't need an actual heading so.under the tea head we're gonna have our.tea body and this tea body is going to.have an ID of book - list because this.is where we're going to insert all of.our books and we're going to do that.using javascript okay so that's the.entire UI we'll go ahead and.save that actually let's add one more.class to the table to push it down a.little bit so MT margin-top - 5 that'll.push it down a little bit and then we.need to of course include our app J s so.right here will say script source is.gonna be app dot J s all right so we.should be all set to start on our.JavaScript all right so we're gonna jump.into AB Jas and I'm gonna just kind of.map everything out so we're gonna put.comments where the classes and the.events will go and I did change the code.up a bit from the course so if you did.take the course you may notice some.changes especially with the UI class.basically I made all the methods static.so that we don't have to instantiate the.UI class and I do have a tutorial on.object oriented programming in.JavaScript so basically he has six.classes if you want to check that out.that's on YouTube but yeah we're gonna.just kind of put some comments in here.so we're gonna have the book class and.the purpose of that it just represents a.book so every time we create a book it's.going to instantiate a book object we're.gonna have the UI class and this is to.handle UI tasks so anything in the user.interface like when a book displays on.the in the list here or removes or we.show an alert that's going to be within.the UI class then we're gonna have the.store class which takes care of storage.so handles storage in this case it's.local storage which which is within the.browser it doesn't go away when you.refresh the page or leave the site or.close the browser it stays there until.it's cleared so then we're gonna have.some events so have an event to display.books and which means just show the.books in the list here we're gonna have.an event to add a book.and we're gonna have an event to remove.a book and that that's both in the UI.and in storage local storage so let's.start off by just creating a book class.and we're not gonna need to use this.class until we get to actually adding a.book but it's easy enough just to just.to create it's just gonna have a.constructor so we'll say class book we.want our constructor which is just a.method that runs when we instantiate a.book it's gonna take in all the fields.so title author and ISBN and then we.want to take those those whatever's.passed in as these parameters and assign.it to the property of that object and we.do that using this kay the this keyword.so this dot title will then be set to.whatever titles passed in this dot.author will be set to the author that's.passed in and then the ISBN okay and.that's all we should need for the book.class and we're not going to be using.this for a little while now the UI class.is a class UI is going to have a few.methods we want display books we have.ADD book to list we have remove book.from list we have what else alerts show.alert so stuff like that is gonna be.going on in the UI now I don't want to.have to instantiate the UI class so.we're gonna make all the methods static.so for instance we're gonna have a.method called display books and make.sure you put the static keyword before.it now ultimately we want to pull our.books from local storage but we're not.dealing with that just yet so I'm going.to hard-code actually I'll just paste it.in here it's just uh just a hard-coded.array of books and I'm putting it in a.variable called stored books okay so.let's just pretend that this is coming.from local storage and then we're gonna.create our books variable here and set.that to stored books.all right actually you know what we.could just know we'll leave it like this.I don't want to I don't want to put the.actual array in books because we'll just.pretend that this is local storage so.conce bucks equals stored books now what.we want to do is loop through all the.books that are in this array okay they.will be in local storage but right now.they're just hard coded we want to loop.through them and then we want to call.the method add book to list in the UI.class because what that method does it's.responsible for adding the book to the.list right here.so let's loop through we'll say we'll.use a for each so we'll say books.because it is an array so we can use the.for each method this takes in a function.you can do like function book like that.but I'm just gonna use an arrow so let's.say let's put in some parentheses here.say book we'll use an arrow and then.we're just gonna simply call UI dot add.book to list okay we're gonna call that.method that doesn't exist just yet and.of course we want to pass in the book.okay so just to reiterate we have this.hard coded data this array we're setting.books to that array then we're looping.through and then we're just calling a.method on that book all right I'm sorry.yeah calling method and passing that.book into it so now let's create add.book to list and we want to actually.make this static.and let's see let's need to add in book.as a parameter here so add book to list.now what's gonna happen here is we're.going to basically create the row to put.into the tea body here so we need to.grab on to this book list ID so let's.actually create a variable called list.and set it to document dot you could use.get element by ID if you want or query.selector.oops query selector and as an ID of book.list.okay so we're grabbing on to that.element in the Dom let me just close the.sidebar up here so we're grabbing on to.that element now we want to create a.table row element okay we want to insert.a TR tag into there so I'm gonna create.a variable called row I'm gonna set it.to document dot create element okay just.a standard JavaScript method to create a.Dom element and we want to create a TR.okay that's the that's the tag we want.and then we want to add some HTML in.there we want to add the columns so.let's take that row and let's say inner.HTML equals and I'm going to set this to.some backticks.okay so that we can use variables inside.this string because we want to put our.TDS in here and for each one we want to.put a variable and we want to grab the.book and then here I want the title as.the first one because if we look at the.HTML we have title author ISBN and then.just the delete delete button so I'm.gonna just copy this down three more.times and the second one is going to be.the author okay this one's gonna be the.ISBN and then this is going to be the.delete button so let's put an a tag here.and it's not gonna go anywhere.what we're gonna do is just have a.special class that we grab on to later.on but we also want the bootstrap.classes to make it look good so BTN BTN.danger will make it red and BTN - SM.will make it small and then delete is.the class that we want to grab on to.later on and then for the text let's.just put an X okay now we have our list.we grabbed from the Dom and we created a.new row that has all this stuff in it.now we just need to append the row to.the list so to do that all we have to do.is call list dot append child and pass.in the row now all we have to do is call.display books and it'll take the books.that we have here hard-coded it's going.to loop through them and it's going to.add each one to the list with this.method here so how do we call this we.want to do that right here in this event.to display the books so we're gonna do.document dot add event listener and the.event we want to listen for is Dom.content loaded okay so as soon as the.Dom loads then we want to call UI dot.display books so let's go ahead and save.this and there we go so now the books.are being displayed all right now the.next thing I want to do is is I want to.be able to submit the form and add a.book to the list now we already have ADD.book to list in our UI here so we should.be able to utilize this method again not.just with display books but also when we.actually click Submit so we need to.handle collecting the data from the form.we need to handle instantiating a new.book and then calling that add to add to.list method so let's go down here and.let's say document dots.we'll use query selector and we want to.grab the form which has an ID of book -.form I believe.let's just check that out book form.right here so we're grabbing that and.we're gonna call add eventlistener.because we want to listen for us submit.on that form and when that happens then.let's just put an arrow function with an.event parameter here and there's a few.things we need to do so one we need to.get form values so let's create a.variable for each one will say title.equals document dot and let's do query.selector and the inputs all have ID so.we have title author ISBN so we want to.grab on to that so let's grab the ID of.title and since this is an input we.don't want the actual element we want.the value that's actually placed in it.so if we want to add on dot value like.that not node value just value and then.let's copy this down a few times and.this one here is gonna be author and we.want to change the variable here to.author let's change this to is BN and.ISBN all right so we should be able to.get these values so once we get the.values we want to instantiate a book.from this book class right here okay and.this isn't static so we need to actually.instantiate a book too.to add a book so let's do instantiate.book so we'll say Const book equals and.we want to do new book and then pass in.the values that we want which are going.to be from the form from the fields.above so author ISBN and then you know.what I'll do is just console log book.so it's saved that let's go over here.and let's open up our chrome tools and I.need to keep this high cuz I know I'm.being displayed down here somewhere.let's say title book one author Brad.some number and submit oh I forgot you.see how it flashed real quick because.this is a submit event we need to.prevent the default value all right or.the default action of the form being.submit so let's say prevent actual.submit so we'll take that event.parameter and we'll call prevent default.okay so let's try that again book one.all right we'll go ahead and submit and.now you can see our book objects so this.is coming from this right here we.instantiate a new book it's it just.looks like a regular object but notice.it's prefixed with book because that's.the class that it uses okay so good so.far so good now the next thing that we.want to do is we need to add it to and.we close this up we need to add it to.our UI now remember we already have that.add book to list right so let's go right.underneath and let's say UI dot add book.to list and then simply pass in the book.so let's try it again say book we.already have one and two there so we'll.say three author we'll say I don't know.Harry White and let's add book and there.it goes it gets added so if I reload.it's going to go away because we haven't.persisted it to local storage so we're.going to get to that in a little bit we.have a couple other things to do first.one of one of which is to clear our.Fields because right now if we submit.something you see that as soon as we.submit this stuff stays here I don't.want that I want I want this stuff to go.away so we're gonna have a method called.clear fields so let's say clear fields.and that's gonna be on the UI class like.that so let's go up and create that so.under the add book to list which ends.right here we're gonna say static clear.fields alright and this is going to be.pretty simple all we have to do is grab.each value and clear it so let's do.document dot query selector and let's.grab the title and we just want to set.the value so we're gonna say dot value.and set that to nothing and then we'll.copy that down two more times and we.want to do the same with author and ISBN.so now when we go when we add something.here.don't wait why didn't that work oh I.forgot the number sign here didn't know.what we meant so now when I submit.notice that that all the fields all the.text in the fields goes away so next.thing I want to work on is the hmm I'm.trying to figure out what I want to do.next we could move on to the delete or.we could go to the validation and the.alerts so let's you know what let's do.let's do the delete just so we get the.functionality the core functionality.down of adding and removing books and.then we'll work on the the the I guess.the luxury of validation and alerts and.stuff like that now this is something.that that it confused me in the.beginning and it seems to confuse a lot.of people since we have.multiple deletes here delete links we.can't just target it for the event to.add the click event because it so it'll.only delete the first one if we do that.we need to use something called event.propagation where we select something.above it like the book list and then we.target whatever is clicked inside of it.okay and then we we deal with it that.way so let me just show you if we go.document dots query selector and we want.to select the book list okay so the idea.of book - list which if we look it's the.right here the t body ID and then we're.going to add the event listener to that.for the click okay and then we'll have.our function and then what I'll do is.I'm going to console.log that event.parameter and then it has a target.property now if I open up my console.here and I were to click on one of these.you'll see it'll actually give me what's.clicked on if I click on this it'll give.me the TD anything within this it'll.give me that whatever that is alright so.that's how we can actually target a.certain element inside of the book list.so what we're gonna do is we're gonna.pass this target into a method on the UI.called a delete book alright so let's go.up here to the UI class we'll go write.it well let's go above the clear fields.and let's do static delete book.and then I'm gonna pass in whatever that.target element is actually we could use.L it makes a little more sense all right.so we're gonna target that and then.let's see yes so this is gonna be pretty.simple we just need to make sure that.what we click contains the class delete.because if you look at the the button or.though I should say the link this is.this right and we want to make sure it.has this delete class before we do.anything so let's say if the element dot.class list dot contains okay so this is.how we can see if a class is included in.the class we want to look for is delete.okay if that's so then we want to remove.that this whole thing we don't want to.remove just the link that would be silly.because then we'd be left with the book.we would just remove that so we actually.want its parent because its parent is.gonna be the whole row right so let's.say we'll take our element and we'll say.we want the parent parents element and.actually wait a minute let's take a look.at the yeah we want the parent element.of the parent element because look we're.clicking the link its parent element.would be this TD right we don't want to.remove that because again we'd be stuck.with the book still we want the parent.element of that which would be the whole.role the TR okay with the TR right here.so we want to actually do parent element.twice and then we'll simply remove it.from the Dom with remove so let's save.that and let's go back and click one of.these and now we can remove them all.right now if you were to target just the.delete class like down here and say.click and then remove it whatever it.would only do the first one because it's.gonna look for the first delete class.and just remove it well we did is event.propagation where we targeted the actual.list and then inside there we said well.if it contains delete then remove that.whatever we click okay I'm sorry remove.the parent parent of whatever we click.so I hope that makes sense and and yes.vanilla JavaScript is it's more.difficult than to do it with a framework.but it's good to know this stuff you.want to know these types of methods just.it just it sharpens your skills as a.programmer in general all right so we.can now add them to the UI and where we.haven't dealt with storage yet but we.can add to the UI we can remove them.before we go to storage let's deal with.validation and alerts so we're gonna go.down to let's see where we add a book.and we're gonna want to check for we're.going to want to make sure that all the.fields are filled in so see before we.instantiate a book so we're just gonna.go right here and say validate and let's.do a simple if statement here I'm just.going to check for all fields so we'll.say if title if title is equal to.nothing or author is equal to nothing.not and we want or is begin is equal to.nothing then we're gonna want to show an.alert now for right now I'm going to put.in a simple JavaScript alert just say.please fill in all fields and then we'll.do an else so if it passes then we'll.move on and do this so let's copy that.paste that in here alright so let's try.that out now if I were to submit this we.get please fill in all fields even if I.have you know two out of the three still.we need to.everything then it works alright now we.don't want to use that shitty JavaScript.alert we wanted to have you know we want.to inside the UI so we want that nice.bootstrap alert danger class and stuff.like that so what we'll do is create a.special method in our UI class called.show alert so let's go right above clear.fields and it's a static show alert all.right now show alert is gonna have a.couple properties because we need for.one the message right we need the actual.text and then we also want a class name.because we want to style it we want it.read if it's an error we want it green.if it's just a regular you know info.alert or whatever success message so.we're gonna we're gonna build this div.from scratch notice we don't have a.placeholder in our HTML for the alert.we're gonna build it from scratch and.insert it right into the UI so first.thing we'll do is create a div so let's.say Const div and we'll set that to.document dot create element we want to.create a div okay and just to show you.guys the the way that bootstrap alerts.or the way that this is going to be.formatted as a div with the class of.alert and then if it's if we want it to.be read it'll be alert danger if we want.it to be green it'll be alert success.like that and then we'll have you know.whatever the message in here okay so we.want to build this from scratch in.JavaScript okay and insert it into the.Dom so we have our div next thing we'll.do is add our classes so let's say let's.take that div and say class name and we.want the class so I'm going to put in uh.some backticks here and remember what I.showed you it has a class of alert and.then whether it's alert danger alert.whatever but we're gonna pass that in.here with the class name so let's just.put in our very.syntax and put in our class name we.could even do this this might be a.better thing to do is to just do alert -.so that way we can either pass in.success or danger instead of alert -.success alert - danger it's up to you.you know that doing this stuff there's.there's so many different variations of.how you could do it if you find.something if you see something that I do.that you don't like and you would rather.do it a different way by all means go.ahead and do that next thing we want to.do is add the text so we're gonna take.that div and we want to append child.meaning we want to put something in the.div and we want text so this has to be.at what's called a text node and we can.do that by using document dot create.text node and the text is going to be.the message that's passed in okay right.here all right next thing we want to do.is we need to start to figure out how to.insert it and we're gonna actually grab.the parent element which is the.container because where I want to put it.is let's see we have our container div.right here and then we have our h1 so I.actually want to put it right here this.is where the out where the Dib should go.so to do that let's let's create a.container and we'll set that to document.dot query selector has in a class of.container all right and then let's get.the form so say form equals document dot.query selector and the form has an ID of.book form.okay and then we want to insert the.alert so I'm going to take the container.which is a parent and I'm gonna say.insert before and I want to insert.before the div I'm sorry I want to.insert the div before the form okay and.it's kind of weird the way that these.methods work or the way that we have to.do this but we just need a parent.element which we use the container and.we want to use insert before for our div.that we want to insert and we want it to.go before the form so again looking at.our at our HTML here I want to put it I.want to put it right here okay so the.container is the parent and I said.insert before the form hopefully that.makes sense all right let's see so let's.try it let's save it and we need to call.it somewhere because right now we just.have the method so let's go back down to.our error here and instead of just doing.the standard JavaScript alert let's.actually say UI dots show alert and we.have our message being passed in so.let's make this an error message and.remember the class for bootstrap alert -.danger but we already put alert - so.we'll just say danger and let's save.that let's try it.there we go fill in all fields and it's.red if we put success here it's green.and there's other ones as well as like.info that would be blue so there we go.just let's put it back to dangerous so.that's that's all set now if we keep it.the way it is this is just gonna stay.here okay if I if I keep doing is.there's just gonna get keep adding so I.want it to go away after three seconds.so let's go back up to the show alert.and let's say make will say I will say.vanish in three seconds if you want to.change the number of seconds you can do.that but let's do set timeout.so set timeout actually takes in a.function you can do function if you want.but again I'm going to use arrow.functions so let's say we want to.document dots and we want to select the.alert so document dot query selector.anything that has the class of alerts.then we want to remove it so dot remove.and then there's a second parameter to.set timeout so the first is the function.the second is the number of milliseconds.so I'm gonna say three thousand which is.three seconds all right so let's save.this and let's try it will add book with.no fields and there it goes after 3.seconds it disappears so you're not.gonna get flooded with these alert.messages and it's not going to just stay.there good so let's see the next thing I.do want I want a message after we add a.book as well so let's see let's yeah.when we add a book so we passed the the.validation and then we instantiate a.book we add it to the UI we clear the.fields so you know what I'll do is right.before we clear the fields let's show a.success message so we can simply do UI.dot show alert okay wherever we want to.show an alert now we can simply do this.and we'll just say book added and for.the the class name let's do success.so now it's just quickly at a book in.here and there we go book added it.should go away good so let's also do it.when we delete cuz right now if I delete.a book it just it doesn't do anything so.I'm gonna just copy this and let's go.down to remove a book and we'll put this.yeah I'll put this right after the.delete book and let's say book removed.so now if I delete a book we get book.removed good so we're at the point where.we where we can do everything in our UI.we can add we can remove but it's not.getting persisted to anywhere so now.we're gonna start to deal with the.storage now the store class is just for.that for store.storing and local storage and retrieving.removing it's not for anything to do in.the UI we've handled that already okay.you want to separate your your.functionality so let's go up to the.store class and well let's create the.store class and we're basically going to.have when we gonna have three three.different methods really one is going to.be to get books I'm just going to write.them out right now so we have get books.we have add book and that's going to.take in a book and then we have removed.book.all right and oh one thing we need to do.is make sure that these are static so we.can call them directly without having to.instantiate the store class okay and.then I'm just gonna I'm gonna create.these methods so I'm gonna add the logic.and then we'll implement them after and.there's not going to be too much here I.mean local storage stores different.basically key value pairs we're only.going to be hat we're gonna have an item.called books which is going to be a.string version of our entire array of.books you can't store objects in local.storage it has to be a string so before.we add it to local storage we have to.stringify it and then when we pull it.out we have to parse it so let's go.ahead and forget books we're going to.just initialize a variable called books.and we need to check to see if there's a.current book item in local storage so.we're gonna say if local storage dot get.item okay that's a method that's that's.attached to local storage we want to see.if there's an item called books now to.check this we want to say if it's equal.to No so basically we're saying if there.is no item of books then we want to take.that books variable we just instantly.just initialized and we just want to set.it to an empty array since there's no.books else if there is something found.in the books item then we're going to.set that books to local storage dot get.item books now the problem here is it's.going to be stored as a string so what.we need to do is we actually run need to.run this through a JSON dot parse method.so that we can actually use it as a.regular JavaScript array of objects and.then we need to return it ultimately so.down here we need to return whatever is.in books.all right so save that.so to add a book is really easy we just.need to first of all get the books from.local storage now we can do that just by.using store get books right and then we.just need to push on whatever is passed.in here as a book we can just push on to.it so we'll say books dot push and we'll.push on that book all right then we just.basically need to reset it to local.storage so we'll say local storage and.then we can use set item and the item.we're setting is books and we're setting.books now the problem here is like I.said local storage is strings right now.books is an eye is an array of objects.so the solution to this is just to wrap.this books in json dot stringify that.way it can actually get added all right.so pretty simple that will add a book.now to remove a book we're going to.remove it by its ISBN because that.should be unique we're using that kind.of like an eye ID or like a primary key.so again we have to get the books so.const books equals store dot get books.and then what we're going to do is loop.through them we're using a for each so.for each we're gonna call each one book.and then we also have the index.available to us and then we just want to.check to see if the current book that's.being looped through that's being.iterated through if the ISBN matches the.one that's passed in for remove book so.book dot ISBN if that is equal to the.ISBN that's passed in then we'll simply.slice it out of the array so we can say.books i'm we're actually gonna use the.splice method so we'll say splice and to.know where we need to splice it we have.the index available to us so index and.then we're only splicing one so that.should actually remove it now right now.it has nothing to do with local storage.this is just.books you know the the data we pulled.now we need to reset local storage with.the with that book removed so let's say.local storage dot get item.I'm sorry set item because we're setting.it set item the item we're setting is.books and we want to pass in books but.we have to stringify it so Jason dot.stringify our books and put it into.local storage and that's it those are.our those are our methods so we'll save.this and obviously we've only created.these methods we haven't actually.implemented them yet so we're gonna go.down to our events here and figure out.where we need to implement them so.actually you know what the first thing.we'll do is get rid of our dummy data.because right now what we're seeing here.is just this thus Tummie data so I'm.gonna completely get rid of this and now.we can simply set our books to our store.method of get books because that will.reach into local storage and get them.for us and return them so let's save and.notice there's nothing there which is.correct because we don't we haven't.added any to local storage so now let's.go down to the bottom where we where we.actually add a book you can see right.here we're adding it to the UI so now.let's add book - we'll just say add book.- store so store dot add book and then.we're gonna pass in book all right so.now what I'll do is go over here and.I'll say book one John Doe and add ok we.get book added now right now I can.reload and notice that it's not going.anywhere because it's actually in local.storage and another way we can test is.by opening our console going to the.application tab and there right here if.you go down to local storage and you hit.your localhost you'll see books as the.key and as the value you have just.one big string which is formatted as an.array of objects all right so it's being.stored there as a string and when we.pull it out we're parsing it as Jason.and we're dealing with it all right so.last thing is the delete because if I.delete it works in the UI but if I.reload it comes back so we'll need to go.down to where we remove a book excuse me.let me just put a comment for this one.because we're remove book from UI now we.need to remove book from the store so.simply say store dots remove book now.this this is a little difficult because.our remove book takes in the it takes in.the ISBN right if we go up to our store.class remove book takes in the ISBN and.we need to get it from here now remember.when we click the delete button that is.targeting the delete button right and.then we use that let's see if we go up.to UI we use that to pass into the e/l.and then we do our thing but we actually.need to pass in the ISBN here so what we.can do is get our target that's going to.give us the the the link itself that we.click then we need to navigate to the.parent element because the parent.element is going to be the the TD right.so if we look at the structure of this.link which is right here the parent is.the TD we need to get to here so we need.what we're doing is traversing the Dom.to get to here we need to go up to this.TD and there's a method we can use.called previous element sibling that.will get us here and then to get the.intertext we could we could use inner.text or we could use text content so.let's do that.let's.a target dot parent element and then.previous its previous element sibling.and then we want the text contactually.text content like that that should give.us the ISBN and then that will be passed.in to remove books so let's save and.let's ex and reload and now it's gone ok.so now we can actually add stuff to.local storage and delete it let's just.try it one last time okay so now it's in.local storage I can delete we have one.left if I reload it's still there.alright so that's it guys I hope you.like this little project and again if.you're interested in stuff like this I.do have a 21-hour course called modern.JavaScript from the beginning I'll put a.link in the description with a promo.code and that's it thanks and I'll see.you next time.

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