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So in this video we're going to learn
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how to parse some variables from the URL
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in order to be able to build the product page.
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So remember how right in the beginning
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I imported the URL module,
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so this one here,
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in order to be able to parse variables right off the URL.
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Okay. So, as a first step,
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let's actually once more
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log "req.url" to the console
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and then another thing that I want to log is to actually...
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the result of using "url.parse" on this URL.
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So, again, parse is to basically parse the variables
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out of the URL.
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So, something like this.
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So, what we want is "id = 0," right,
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because right now, the "req.url"
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is all of this,
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so this entire URL, and of course,
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we don't have any route for that.
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So nothing here in these kind of routers that we have here,
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actually matches this entire URL.
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So that's why we get "Page not Found!"
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And so that's also why we need to change some stuff here.
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Okay, so let me parse the URL here,
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so that you can take a look at the result
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to see what we need to do next.
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I also need to pass "true" here into this parse function
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in order to actually parse the query into an object.
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So, with query, I mean this part here.
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Okay, so this is called the query string,
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alright, and so that's what we're effectively parsing,
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that part from the URL.
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So restart it
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and let's just take a look at the logs that we get.
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So, first is the "req.url"
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and this is what we were expecting, right,
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and here is the result of doing "url.parse"
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So we get the query object here,
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and so here, we have a nice object which tells us
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that id is 0, right,
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so that's beautiful.
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And then, right below that, we actually have
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the second piece that we need,
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which is just the pathname, okay.
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So, our route is using this pathname,
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so just "/product," and then we need to know the query
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in order to respond accordingly to the id of 0.
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So in this case, for example,
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loading the avocado product, which is the first one.
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But if it was number two, for example,
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then loading this broccoli, right.
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And so this query and this pathname
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is what we're going to use for doing that.
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So, this one we don't need anymore.
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We also don't want to log anything to the console now
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because what we want to do instead
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is to create two variables, called query
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and ...
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pathName.
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And we can do so using the stacks, the structuring.
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So, again, I hope that you are familiar
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with this syntax here, and this is how it actually works.
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So, this object here, it has query and pathName.
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So by using this structuring like this,
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with these exact property names,
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actually it has to be like this.
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So with these two exact property names,
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it will create these two variables,
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one called query and one called pathname,
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with exactly the values that we have here.
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So query will be this one,
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and pathname will be "/product," in this case.
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Great. Now all I have to do is go ahead
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and replace this here with this one.
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All right.
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Let's delete this one, and just to make sure
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let's actually log the query to the console
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in case we are on the product page.
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"console.log" the query object.
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And now, we're back to finding the page
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and we also have to query with this id 0.
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So, perfect. So now we're ready
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to actually build this page using our template.
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And that should be very simple,
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actually way simpler than the overview page,
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because here we don't have to do
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any of these crazy loops over here
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because there's one simple template,
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all we have to do is to replace everything.
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So, in the first step, let's actually figure out
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which is the product that we want to display.
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So I'm creating a variable called product,
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and that will be equal to the data object
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at the position "query.id."
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Okay, makes sense?
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So the data object is an array,
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and we will then retrieve the element
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at the position that's coming from the query.id.
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So, if it's zero, then it's element zero,
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if it's two, it is element number two.
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Okay, and so this is the simplest way
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of retrieving an element based on a query string.
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Now another thing that we need to do
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is to get this exact same Head here, okay,
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and finally we simply create our output.
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So, output is simply replaceTemplate,
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and the HTML that we need to pass in
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is the tempOverview, or actually the tempProduct,
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and what we pass in is the product.
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And that's it!
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Now we just send the output as a result,
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or as a response actually, and so that's it.
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So this part here makes sense, right?
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So, again, replaceTemplate expects us
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to put in a template and a product.
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So a product is an object with all of these properties.
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And so that product comes here
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right from this data object.
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So in replaceTemplate, we pass in the template product,
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so this one, that we loaded up from the file
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right in the beginning, and then product.
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As I mentioned, of course, the one coming from the array.
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And so that should actually be it.
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So if the template is correct,
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then this should be working now.
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So, restarting the server,
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let's reload it,
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and indeed, here we go.
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So, that is great, that makes me really happy,
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when this kind of stuff works like this,
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beautiful, everything is perfect.
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Also this back button, oh that doesn't work.
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Okay. So we need to change the HTML template here.
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So where is that? It is in product,
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and this link here, where is that, ah.
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Yeah, it points to nowhere basically,
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and what we want is to go back to overview, right.
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Restart the server, reload this page,
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and now, now it works.
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Let's try out on without the organic patch,
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and indeed, it is not here.
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Before it was, and now it's gone.
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And all of this stuff here of course
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is dynamic coming from that JSON file. Yeah.
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So all of this works. Beautiful.
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That's really really great.
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And our project, we can now say, is actually finished.
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Just one more small thing that I want to do,
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which is just to show you some nice thing that we can do.
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But besides that, our project is working.
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So congratulations, you just finished your very first
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really cool looking node.js project.
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And it wasn't that hard, right?
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I mean, some of the things that we did
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are more related to JavaScript programming in general,
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and not so much about node.js itself, right?
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So stuff like this here, which was maybe kind of confusing,
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but again at the end of the day that is just
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regular JavaScript really, isn't it?
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So again, the functionality is there,
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there's just one more small thing that I want to do
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in the next video, and when you reach that one,
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I will tell you what that is.
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