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xhtml forms

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615

<p> Choose your beans:

<option value=”House Blend”>House Blend</option>

<option value=”Bolivia”>Shade Grown Bolivia Supremo</option>

<option value=”Guatemala”>Organic Guatemala</option>

<option value=”Kenya”>Kenya</option>

</select>

</p>

<input type=”radio” name=”beantype” value=”whole” /> Whole bean <br />

<input type=”radio” name=”beantype” value=”ground” checked=”checked” /> Ground

</p>

<p>Extras: <br />

<input type=”checkbox” name=”extras[]” value=”catalog” checked=”checked” /> Include

catalog with order

</p>

Name: <input type=”text” name=”name” /> <br />

Address: <input type=”text” name=”address” /> <br />

City: <input type=”text” name=”city” /> <br />

State: <input type=”text” name=”state” /> <br />

Zip: <input type=”text” name=”zip” /> <br />

<p>Customer Comments: <br />

</p>

<p>

</p>

</form>

Adding the checkboxes and text area

Here we’ve added a checkbox for each

option. Notice that these share the

same name, “extras[]”...

...but have

different values.

Like the radio

buttons, we’ve

put these

labels to the

right of the

checkboxes.

We’re using the checked

attribute to specify that

the catalog option should

be checked by default.

You can add a checked

attribute to more than

one checkbox.

Here’s the

text area.

We’ve specified that we want it to be 10

characters high and 48 characters wide.

You know the drill: look over the new XHTML and add

it to your “form.html”.

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Chapter 14

The final test drive

Save your changes, reload, and check out the new form.

Don’t you think it’s looking quite nice?

Here’s our brand new

checkboxes, with the catalog

checkbox already checked.

And a nice new

text aera as well.

Here’s what you get when you

submit. The Web application has

received all the form data on

the page and has incorporated it

into the response page. See if you

can locate all the form data you

submitted.

Be sure and try out all

the various combinations of

sending this form (with gift

wrap, without, with a catalog,

without, different coffees, and

so on) and see how it all works.

successful submission

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Stop right there. Do you

think I didn’t see the way you

slipped in that element name of

“extras[]”? What’s with those

square brackets! You have to

explain that.

But even if it’s valid, it doesn’t exactly look

normal, does it? Here’s the deal: from the

perspective of XHTML, this is a normal

form element name; it doesn’t have any effect

on the browser at all if it has square brackets

in the name.

So why did we use them? It turns out that the

scripting language that the processorder.php

Web application is written in likes a little hint

that a form variable may have multiple values

in it. The way you give it this hint is to add

“[ ]” on the end of the name.

So, from the perspective of learning XHTML,

you can pretty much forget about all this, but

you might just tuck this into the back of your

mind in case you ever write a form that uses a

PHP Web application in the future.

Believe it or not, “extras[]”

is a perfectly valid name

for a form element.

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Chapter 14

<p>Your information: <br />

Name:

<br />

Zip:

<br />

</p>

<p>Which model do you want? <br />

Mini Cooper</option>

Mini Cooper S</option>

Mini Cooper Convertible</option>

</select>

</p>

<p>Which color do you want? <br />

Chili Red <br />

Hyper Blue

</p>

<p>Which options do you want? <br />

Racing Stripes

<br />

Sport Seats

</p>

<p>

</p>

</form>

Below, you’ll find an XHTML form, and on the right the data a

user entered into the form. Your job is to play like you’re the

browser and match each form element name with the values

the user entered. After you’ve done the exercise, look at

the end of the chapter to see if you matched up the form

names with the values correctly.

BE the Browser

Here’s the form.

match the form names

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619

name = __________________

zip = ___________________

model = _________________

color = _________________

caroptions[] = __________

And here’s the form filled out.

Match each piece of form data

with its form name and put your

answers here.

“Buckaroo Banzai”

Extra credit...

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Chapter 14

Now that we’ve got the form

ﬁnished, can we talk about the method

the browser uses to send this data to the

server? We’ve been using “POST”, but

you said there are other methods, too.

POST and GET accomplish the same thing – getting

your form data from the browser to a server – but

in two different ways. POST packages up your form

variables and sends them behind the scenes to your

server, while GET also packages up your form variables,

but appends them on the end of the URL before it

sends a request to the server.

There are two primary methods

the browser uses: POST and GET.

With POST all the form data is sent as part of

the request and is invisible to the user.

ﬁrstname=buck

lastname=bonz

item=java

number=2

Web

Application

Web

Application

POST

GET

http://www.headﬁrstlabs.com/contest.php

http://www.headﬁrstlabs.com/contest.php?ﬁrstname=buckaroo&lastname=banzai

With GET, the form data is added to the URL

itself, so the user sees the form data.

The user just

sees the Web

application’s URL

in her browser

address bar.

The request doesn’t

have any of the form

data in it.

Notice the form

data added on

to the end of

the URL. This

is what the

user sees in the

address bar.

form methods: get and post

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there are no

Dumb Questions

Why is it called “GET” if we’re

sending something to the server?

Good question. What’s the main

job of a browser? To get Web pages from a

server. And, when you are using GET, the

browser is just going about getting a Web

page in the normal way it always does,

except that, in the case of a form, it has

appended some more data to the end of the

URL. Other than that, the browser just acts

like it’s a normal request.

With POST, on the other hand, the browser

actually creates a little data package and

sends it to the server.

So why would I use POST over

GET, or vice versa?

There’s a couple of big differences

that really matter. If you want users to be

able to bookmark pages that are the result

of submitting a form, then you have to use

GET, because there is no way to bookmark

a page that has been returned as a result of

a POST. When would you want to do that?

Say you have a Web application that returns

a list of search results; you might want users

to be able to bookmark those results so they

can see them again without having to ﬁll out

a form.

On the other hand, if you have a Web

application that processes orders, then you

wouldn’t want users to be able to bookmark

the page. (Otherwise, every time they

returned to the bookmark, the order would

be resubmitted.)

A situation when you’d

never

want to use

a GET is when the data in your form is

private, like a credit card or a password.

Because the URL is in plain view, the private

information is easily found by others if they

look through your browser history or if the

GET somehow gets bookmarked.

Finally, if you use a <textarea>, you should

use POST, because you’re probably sending

a lot of data. GET requests have a limit of

256 characters; POST has no limit on the

size of the data package you send.

Watching GET in action

There’s no better way to understand GET than to see it in action.

Open up your “form.html” ﬁle and make the following small change:

Just change the method

from “POST” to “GET”.

Save and reload the page; then ﬁll out the form and submit it. You

should see something like this:

http://www.starbuzzcoffee.com/processorder.php?beans=Kenya&beantype=gro

und&extras%5B%5D=catalog&name=Buckaroo+Banzai&address=Banzai+Instit

ute&city=Los+Angeles&state=CA&zip=90050&comments=Great+coffee

You’ll see this URL

in your browser.

Now you can see every

form element name

and their values right

here in the URL.

Notice that the browser encodes

various characters, like spaces. The

Web application will automatically

decode these when it receives them.

622

Chapter 14

For each description, circle either GET or POST

depending on which method would be more

appropriate. If you think it could be either, circle

both. But be prepared to defend your answers...

GET

POST

GET POST

A form for typing in a username and password.

GET POST

A form for ordering CDs.

GET POST

A form for looking up current events.

GET POST

A form to post book reviews.

GET POST

A form for retrieving beneﬁts by your government ID number.

GET POST

A form to send customer feedback.

Sharpen your pencil

test yourself, get and post

xhtml forms

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623

I’ve been meaning to say, great

job on the Bean Machine! This is really

going to boost our coffee bean sales. All

you need to do is give this a little style

and we’re ready to launch it for our

customers.

Given everything you

know about XHTML

and CSS, how would

you approach styling

this form?

brain

power

624

Chapter 14

Tonight’s talk: Table and CSS spar

over how to lay out forms.

Table

CSS

Hey CSS, what’s happening?

What on earth are you doing in this chapter,

Table?

What do you mean? I dropped by to help get

these forms in shape. They’re looking a bit... well,

ragged, if you ask me.

I agree the forms need some ﬁxing up in the

looks department, but that’s my job. You’re for

tabular data, remember?

Yes, and some people consider form

elements to be tabular data, you know.

Besides, I’m much better at making forms

look good than you are.

Says who?

Says me. I get forms looking nice and neat, with

the labels and form elements all aligned properly.

I can position things too, you know. These

readers have read the chapter on positioning;

they know how to get things “all aligned

properly” using CSS. Anyway, even if you

can align the form elements properly, you

certainly can’t do things like add color and

padding and change the font family.

Well, I agree I can’t add those little extra touches

like you can, but that stuff doesn’t really matter

anyway. That’s just the icing on the cake. The real

trick to making forms user-friendly is getting the

labels and elements presented in a way that makes

sense, so there’s no confusion about what goes with

what. Users don’t really care about all that other

stuff.

tabular versus presentation

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