Lecture 37, Part 1: Coding the Menu Categories

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Из курса от партнера Johns Hopkins University

HTML, CSS, and Javascript for Web Developers

4702 оценки

Johns Hopkins University

HTML, CSS, and Javascript for Web Developers

4702 оценки

Курс 4 из 6 — Specialization Ruby on Rails Web Development

Do you realize that the only functionality of a web application that the user directly interacts with is through the web page? Implement it poorly and, to the user, the server-side becomes irrelevant! Today’s user expects a lot out of the web page: it has to load fast, expose the desired service, and be comfortable to view on all devices: from a desktop computers to tablets and mobile phones. In this course, we will learn the basic tools that every web page coder needs to know. We will start from the ground up by learning how to implement modern web pages with HTML and CSS. We will then advance to learning how to code our pages such that its components rearrange and resize themselves automatically based on the size of the user’s screen. You’ll be able to code up a web page that will be just as useful on a mobile phone as on a desktop computer. No “pinch and zoom” required! Last but certainly not least, we will get a thorough introduction to the most ubiquitous, popular, and incredibly powerful language of the web: Javascript. Using Javascript, you will be able to build a fully functional web application that utilizes Ajax to expose server-side functionality and data to the end user.

Из урока

Coding the Static Restaurant Site

Ready for some REAL fun? This module is it! We'll go over some basics of interacting with a client when managing a web site project and then go visit a real client at their place of business (a Chinese restaurant), help the owner figure out what she wants in a site, and get acquainted with the restaurant in general. We'll spend the rest of the module building a real web site for this business from scratch and you'll get to sit next to me and watch as the site comes together.

Lecture 37, Part 1: Coding the Menu Categories14:29

Lecture 37, Part 2: Coding the Menu Categories6:22

Lecture 38, Part 1: Coding the Single Menu Category Page11:54

Lecture 38, Part 2: Coding the Single Menu Category Page13:38

Lecture 38, Part 3: Coding the Single Menu Category Page7:44

Lecture 39: Testing the Mobile Version on a Real Phone4:55

Module 3 Wrap-Up0:28

Познакомьтесь с преподавателями

Yaakov Chaikin
Adjunct Professor, Graduate Computer Science
Whiting School of Engineering

[SOUND] Okay,

so now that we have coded up the front page, the very main page I think it's

a good time for us to review what the Navigation Structure is going to be like.

Well, the Navigation Structure is actually going to be pretty simple.

When the user first comes to the front page, they'll have an option to click on

this menu button, or they can click on this menu tile, and they will end up at

the exactly the same place and where they will dub is the menu categories page.

So, this is the menu categories page and

all this page will do is list categories for us that are part of this menu

with a picture associated with it and the name of the category.

Now, one of the categories is called specials well that should remind you

of something, on the very front page we have a tile called specials.

Well, all that is,

is just a direct link to a particular menu category called specials.

So, point is when they click in the menu they will end up in this view,

which is going to list, all the menu categories with their pictures and

the names of the category.

The same thing will happen if they click on the menu button right here,

they will also end up with this menu category page.

Okay, so let's go back to the code editor and we'll start coding up this page.

Okay, so here I am in sublime text in examples of folder

lecture 37 in the after folder.

And even though the structure of the page or

the pages in the end product is going to be a little bit different

once we introduce some JavaScript and start writing dynamic HTML at this point,

it's much easier, since it's a design stage, it's much easier for us to simply

copy in the index HTML, and call it something like menu categories.HTML.

So, we'll go ahead and do that.

We'll just call duplicate and the reason we're calling duplicate is because a lot

of the things that are inside index.HTML are going to be exactly the same.

So, the header and the footer and the menu items, they're all going to be exactly

the same it's the main content that's going to change.

So, we'll call this menu-categories the HTML.

So, there's our menu-categories HTML, we could close index HTML,

we don't need it for now.

So now, what we need to do is we need to wipe out,

out of the menu-categories.HTML, anything that has nothing to do with that page.

Well, all the menus,

the collapsible things, they all have to do with it and the only thing that

doesn't have to do with it is anything that's inside this main content container.

So, we'll go ahead and select this, and we'll go all the way down.

And it will say here, this is where it says end of main content very convenient.

So, we'll press shift and we'll select all of that content and

we'll go ahead and wipe that.

Okay. So now,

we're ready to start writing our menu categories,

HTML, and if we look at this page in the browser, well this on is index.HTML.

But now, if we click on the menu tile will actually end up

at menu-categories.HTML, as you could see we only have the header,

the footer, there is no content in the page.

So, let's go ahead and start filling it out.

So, the first thing we need to do is we need to kind of let the users

know what page this is, right?

So, we're going to go ahead and paste this h2,

it's not going to be h1 since h1 is David Chu's China Bistro but

h2 the secondary heading is going to be menu categories,

that's the name of this page that we're at and we're going to give it an ID,

menu categories title, that's going to be this ID and the class is going to be

text center, which is a boot strap class, just to center the text in the middle.

So, if we save that and go to the browser we should see a nice

menu categories title here appearing in the middle.

And the next thing,

it really comes directly from the original menu and that's just a reminder to

the customers about substituting white rice with brown rice and etc here.

This is just real [LAUGH] real business stuff that has to

do with this particular restaurant and again, we're just going to put

in a div with a class text center just to center this in the page.

Now, we're probably going to style this a little bit.

Let's take a look as to what it looks like on the page.

Actually it doesn't really look that bad.

You might want to make it a little bit smaller we'll see.

Okay, so that's basically it for the heading of the page.

And now we need to start coding our tiles and of course, our tiles or

the menu categories themselves, are going to have to be in a grid.

So, let's go ahead and try to do that.

So, let's go ahead and put the entire thing in a section.

So, we're already inside a container right here, right?

So that's a container class that means we don't need to have another container, but

we do want a grid.

So, we're going to go ahead and create a section with a class row, so

we're going to put everything in one row.

And if you take a look as to how we want to position this,

we want six tiles across when it's a full browser and obviously as we squeeze it,

we want to fit as many as possible that will still look good,

but at the same time obviously some of them will need to be stacked.

Okay, so I know each grid in the cell is going to be a div,

we're going to surround that in a div and I have some code prepared for

inside of each grid cell and I'll go ahead and copy and paste that right here.

Let's remove that space right here.

So, let's go over it real quick.

So, we haven't really assigned any columns yet to this grid but

this it going to be the content of pretty much every single grid.

So, number one is, we're going to have a HHREF to single-category, HTML.

So, single-category.HTML is really just going to be a generic page that we

haven't even written, yet but it's going to point to that particular

category that's going to be identified by this div and by this picture.

So, each category is going to have a anchor tag pointing to a single category

that HTML, which in this place is just a placeholder page, and in the future will

be actually a designated either a page or we'll see how that works with JavaScript

we'll be basically designating a place that will show this particular category.

And inside of it we're going to have a div and

a div is going to have this class called category tile.

Obviously, a custom class that we've created and inside of it we're going

to have an image of 200 by 200 and this is something that we've sized before.

And the image source is going to be in images.

And actually that's probably the wrong path.

So, let's take a look at images.

Is going to me menu and at this point let's just pick something like B.jpeg.

So, it is images, then menu, then /B

/B.jpeg and let's save that for now and we'll call this particular category lunch.

Even though I don't think that's what it is.

But, at this point it doesn't really make any difference we're just styling each of

these categories that they should fit in the page, and

then we will fill in the actual data later.

Okay, so far so good.

Let's go ahead and preview it in the browser.

And obviously, we can see the picture, and lunch is somewhere to the right,

and things are obviously not styled 100%.

Okay, let's go ahead and copy this whole div which is going to be our grid cell and

let's paste it a few times.

Basically paste it three, four, five, six, seven, eight, nine.

Let's say that's good enough.

Now, we actually have a grid.

And they're all going to be really the same the only thing that's going to be

different about them is where they're going to be pointing in terms of the URL

in the a HHREF tag and where the image source is going to be pointed but

other then that they're going to be all the same.

So, let's go ahead and start styling our grid.

So, what we wanted to do is we wanted to have six of these things basically in one

row and then, whatever doesn't fit should go ahead and spill over to the next row

not technically a next bootstrap row but just the next row visually.

Som how do we accomplish a six cell layout?

Well, that means that each cell is going to have to cover two columns.

So, let's go ahead and do that.

And we probably want the six category layout even at the medium size screen so

we'll do column md and 2.

So, if that's going to be the case, that means this is going to take 2.

Let's go ahead and copy that, and we'll just insert it into every div.

Okay, so let's go ahead and save that.

And let's take a look in the browser to what we have.

So, we see right away here that this isn't really going to work

because you can see that the pictures are kind of stepping one up on the other and

this is at the full size, this is even at the large size.

So, definitely as we squeeze this,

this is not going to work very well they're kind of stepping up on each other.

So, what that means is that the,

six picture layout is really not going to work, so we have to kind of rethink that.

So, the six picture's not going to work, how about we try, four pictures across.

We can try that very easily by just selecting those two,

let's go ahead and select at every single place all across

our classes selecting this two and changing it to three.

Okay, so that's that, so go ahead and press three,

so every single place has changed three.

So, now what we're going to have is four pictures across the screen.

So, lets go ahead and go back to the browser.

Well,even though it looks all messed up at the moment,

it does look kind of okay, in terms of the pictures fitting in the screen.

So, things are kind of messed up here but we'll take care of that in a minute.

Okay, so that sounds about right.

And let's go ahead and start styling some of the things inside the actual cell

using our styles, that's CSS.

Let's go ahead and style CSS and

let's scroll down to somewhere maybe under the homepage.

Here's the footer, here's the homepage and we'll scroll down right around here.

So, let's remove that space over here, and let me cut a paste some of the code that I

made before the lecture, and we'll go over it right now.

So, first of all the category tile.

Lets go ahead and take a look at our HTML here.

The category tile is that inner tile inside the ATag.

So, the category tile is all that and

we kind of have the very same type of structure that we had In a menu tile and

the specials tile is that we have some text.

In this case, it's actually just an image and then we have a span and we're going to

target that span and position it absolutely within the div element itself.

So, the div element will be like a relative anchor for

the span that's inside of it and we're going to put it on the bottom.

So, let's go ahead and take a look how we're doing it.

So, first of all, the title itself is going to be relative like I told you it's

going to be the anchor and the border,

we're going to have a nice border around it.

The overflow will be hidden so

if anything's sticking out in terms of the picture whatnot.

It should not be actually sticking out and protruding it should just be clipped.

And since we know that the picture or the image is going to be 200 by 200, we're

going to go ahead and style the width and the height to be 200 and 200 pixels.

And we're also going to have some margins the top will be 0,

they, right will be auto.

The bottom will be 15 pixels, and

the auto is going to actually carry a word to the left as well.

So, this is that same trick we spoke about before as to how to center something as

long as you give it a width and you give it auto on both sides margin right and

margin left, it will automatically center itself.

Okay, so that's the actual container div that's going to have that picture.

Now, what about the spin, that's kind of the title of the actual category?

Well, the spin is going to be positioned absolutely, and

it's going to be again bottom zero, right zero the width is going to be 100%.

So, we'll stretch the entire width of that picture we'll center it,

we'll give it 1 point m size text.

And we'll transform it again to uppercase.

The background color will get to be black.

And the color be white.

And again we'll tune down it's opacity just a tad here so

it'll be just a little bit transparent to give us that nice see through effect.

Okay, the next thing we'll do is the hovering part.

We're going to give some box shadow, the same type of box shadow that we had

on the front page when you rolled over this particular category and remember,

each one of these category items, these pictures, are going to be clickable items.

So that's why when you, some sort of a visual indication that a a person can, or

the user can click on that.

And last thing we're going to do here is target the id menu categories title + div,

which means the next sibling to this element.

So, let's go take a look what its menu categories title is all the way at the top

here and we have menu categories title that's the one that says menu categories.

And its next sibling meaning the next element of the same parent,

so this H2 has a parent of this div and

the next sibling of this H2 is this div right here, so we're saying I want to

target the element with this ID and I want to target its next sibling right after it.

Which happens to be right here, this substituting white rice stuff.

So that one we want to give it a margin of 50 pixels.

And the reason we're doing this is because we want to give a nice separation between

the title of the page and kind of its subtitle note to the customers and

actual menu categories that are going to be underneath.

So, we're go ahead and save this and we'll go back to the browser.

We can see that, at least the first row, seems to be looking pretty well and

the second row is, something's wrong with it.

Well, let's go back to our code and let's take a look as to what we've done here.

So, they should all be at this point "col-md-3".

Let's see if we maybe messed up somewhere.

"col-md-3" and sure enough we messed up forgot to do "col-md-3" here.

And I think that's about it, right?

I think they're all "col-md-3" from there on.

Okay, so let's go back to the browser now that we saved it and

now they're nicely all nicely aligned, so and

if we squeeze them here, squeeze the browser, they'll get a little closer and

at some point they'll jump since we haven't really specified anything

behind MD, medium screen size, they'll go ahead and start stacking.

But obviously, we don't want them to stack just yet, around MD.

We want to specify something for the small and the extra small and

that is what we're going to deal with in part two of this lecture.

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