Back-End Programming Exam > Back-End Programming Videos > Django: The Ultimate Beginners Guide > Django Tutorial for Beginners - 23 - Adding Forms to the Template
Django Tutorial for Beginners - 23 - Adding Forms to the Template Video Lecture | Django: The Ultimate Beginners Guide - Back-End Programming
FAQs on Django Tutorial for Beginners - 23 - Adding Forms to the Template Video Lecture - Django: The Ultimate Beginners Guide - Back-End Programming
| 1. What is Django and why is it popular for web development? |  |
Ans. Django is a high-level web framework that allows developers to quickly build secure and scalable web applications. It follows the model-view-controller (MVC) architectural pattern and provides a comprehensive set of tools and libraries for handling common web development tasks. Django is popular for its simplicity, scalability, and robustness, making it a preferred choice for building complex web applications.
| 2. How can forms be added to the template in Django? | |
Ans. Forms can be added to the template in Django by using the Django forms module. First, a form class needs to be defined in the views.py file, specifying the fields and validation rules. Then, in the template, the form can be rendered using the {{ form }} template tag. This will generate the necessary HTML markup for the form, including input fields, labels, and error messages.
| 3. What is the purpose of form validation in Django? | |
Ans. Form validation in Django ensures that the data submitted through a form meets certain criteria or constraints defined by the developer. It helps in maintaining data integrity and prevents invalid or malicious data from being saved to the database. Django provides built-in form validation mechanisms, such as field-specific validators and form-wide validation methods, which can be used to ensure the correctness and integrity of the submitted data.
| 4. Can Django handle multiple forms in a single template? | |
Ans. Yes, Django can handle multiple forms in a single template. To achieve this, multiple form objects need to be created in the views.py file and passed to the template context. In the template, each form can be rendered separately using the appropriate template tags. Additionally, each form can have its own form submission logic in the views.py file, allowing independent processing of the form data.
| 5. Is Django suitable for building large-scale web applications? | |
Ans. Yes, Django is highly suitable for building large-scale web applications. It provides a robust and scalable architecture that allows developers to handle complex business logic and high user traffic. Django's modular design, reusable components, and support for database abstraction make it easier to manage and maintain large codebases. Additionally, Django's built-in security features and extensive documentation make it a reliable choice for enterprise-level applications.
Text Transcript from Video
alright guys so now what we need to do
is first things first actually make the
form so the user has you know something
to click on so in my detailed view I'm
actually just going to go ahead and get
rid of all this because I'm not going to
make this a list item anymore I'm
actually going to make them form inputs
so I'll keep this all the same all this
red Taylor Swift and then the logo I
think that'll be you know pretty cool to
have so so before we even have the form
section what you should always do is you
should include a section for an error
message so an error message is going to
pop up whenever the user tries to do
something that isn't valid like maybe
you were having them sign up for your
webpage and they forgot to input a
username or maybe they tried to make a
password that was only two characters
long so you would want to put a little
prompt at the top of the form Beck hey
you need to actually you know make a
password that's at least like eight
characters or something so it's actually
really simple to do go ahead and make an
if and you can actually name this
variable anything you want but I'm just
going to say if error message because
later on whenever you're handling this
form usually we're just going to want to
say okay do something to that base
redirect them to this page no problem
but if something bad does happen then we
can redirect in to this page and then
we're going to actually store an error
message in here in this variable and
we'll set it equal to like hey use a
longer password or you know whatever we
want to tell them so just make a
conditional right in there and you can
style this however you want I'm just
going to make something bold real quick
so strong and I'll just say error
message
so hopefully this will not exist there
won't be any error messages and this
will not even appear but if it does then
they're going to have a little bold
message at the top says hey you did
something wrong alright so now we want
to end if all right so that's all we
need to do and later on whenever I set
this you guys are going to easily see
what I'm talking about let me clean this
some like being able to scroll for some
reason you feel so free alright so now
we just need to go ahead and make a form
and all right let's build this step by
step so what is the action of the form
the action is what URL you want to send
this data to and of course we just want
to send it to this right here
but remember instead of just hard coding
this we have that cool shortcut so back
in here all right let me just copy this
because I'm too lazy to type it out and
all right so the action for this is
music favorite so that's the URL pattern
we can go ahead and pass in the album ID
as well because we also need to pass in
the song ID but for the song ID we're
going to be getting it from these inputs
so there you go now another thing
another attribute that we want to add is
the method so the method of this is
going to be post most of your forms of
course are going to be post I assume
that you guys already know about getting
posts so there you go now one other
thing that's kind of weird with Django
is it always is a good idea to have a
CSRF token and I'm going to talk to you
guys about um security and the best
security practices with Django in a
whole nother tutorial but if you guys
just want to look at it a little bit
look up cross-site request forgery and
it's pretty cool topic so CSRF token and
usually whenever you're making websites
this is a pain in the butt to add but
the
thing about Django is whenever you want
to use it in Django you just add that in
Django takes care of everything behind
the scenes pretty cool all right so we
have a form right there so now what we
on do is we want to list through this
album and just loop through every song
and make that choice and we already do
that before so remember that was for
song and album dot song set dot all you
let me just go ahead and end my four and
four alright so we're going to loop
through all of the songs and for each
one what we want to do when we need two
things an input button and that's going
to be the radio button that they click
and also a label and label is just going
to be the title of each song so the user
knows what the heck option you're
selecting so let's go ahead and do our
input first so again I'm just using a
radio button you can use a checkbox if
you want but whatever so of course the
type of this equals radio now the ID is
pretty much just for your HTML so for
the first one it's just going to be song
one and then song - and then song three
so we really don't use it in code but
whenever we have labels we pretty much
give it the same ID so that way it knows
that this input or this radio button is
for that label so you guys are going to
see later on whenever we run the final
site but there you go
so I'm just going to write song and then
for loop counter so again this is going
to get Auto incremented each time it
prints out a song so 1 2 3 4 5 and
that's already built in we don't have to
do anything weird with that now after
this just set name equal to song and
value equal to song ID so let me scroll
so you guys can see so again later on
whenever we actually pass this data all
of the form data to the views function
so we can actually handle it this is
going to be the name or just the
variables name and then this is going to
be the song ID
so will pretty much say get the ID of
whatever song they selected let's say
that this one was 20 and then it's going
to look through the debt base and then
do its thing
alright holy crap what's going on here I
have my font way bumped up for you know
just so I can so just so it looks better
on YouTube and it's kind of hard
whenever I'm program and I never program
with my font this big so that's why it's
that kind of freaking me out all right
so now let's just go ahead and make a
nice little pretty label for the user so
for the label the first thing you write
is this four and this attribute is the
exact same is this
so for song one song to yadda yadda
whatever so again this is mostly just
for display and what do we want to
display in the label well let me just go
ahead and display the song title I
really don't care about the file type I
don't think the user is going to care
about that either so I'll just write
song dot song title now another thing
that I'm going to do is this how does
the user know that their song is
favorited well I'm going to go ahead and
find some star icon online and we'll say
that if a particular song is favorited
then right where this is on the
right-hand side just go ahead and plot
that star logo so whatever favorites
they have it's going to have a nice
yellow star right next to it so how do
we add that logic well it's pretty
simple actually you can go ahead and
copy this
alright so delete this and instead of
checking for if error message we can say
if song is favorite so if the song is
the favorite then what do we want to
happen let me just pause the video and
find some image all right so I actually
just made one real quick alright so if
this song is their favorite then what
we're going to do is we're just going to
plop up this image and I'll show you
guys what this is
know if you guys can even see that oh
it's only a little star so that's why it
looks all fuzzy sixteen by sixteen but
this is gonna appear right next to the
song looking good all right may looking
sweet and actually after this label I'm
going to add a line break in that way
every song is going to appear on a new
line so they do right now because there
are list items and they do that by
default but to ensure that it does that
with form labels just going to add that
line break now the last thing that we
need to do is we actually need to add a
submit button because if we just run it
right now then it's just going to be a
bunch of radio button options in the
user can select one but they can't
submit it so I'll just say input they
bump this in so input the type equals
submit and the value and the value is
just what text you want to appear on the
button I'll just say favorite that has
no effect on your program whatsoever so
there you go
is first things first actually make the
form so the user has you know something
to click on so in my detailed view I'm
actually just going to go ahead and get
rid of all this because I'm not going to
make this a list item anymore I'm
actually going to make them form inputs
so I'll keep this all the same all this
red Taylor Swift and then the logo I
think that'll be you know pretty cool to
have so so before we even have the form
section what you should always do is you
should include a section for an error
message so an error message is going to
pop up whenever the user tries to do
something that isn't valid like maybe
you were having them sign up for your
webpage and they forgot to input a
username or maybe they tried to make a
password that was only two characters
long so you would want to put a little
prompt at the top of the form Beck hey
you need to actually you know make a
password that's at least like eight
characters or something so it's actually
really simple to do go ahead and make an
if and you can actually name this
variable anything you want but I'm just
going to say if error message because
later on whenever you're handling this
form usually we're just going to want to
say okay do something to that base
redirect them to this page no problem
but if something bad does happen then we
can redirect in to this page and then
we're going to actually store an error
message in here in this variable and
we'll set it equal to like hey use a
longer password or you know whatever we
want to tell them so just make a
conditional right in there and you can
style this however you want I'm just
going to make something bold real quick
so strong and I'll just say error
message
so hopefully this will not exist there
won't be any error messages and this
will not even appear but if it does then
they're going to have a little bold
message at the top says hey you did
something wrong alright so now we want
to end if all right so that's all we
need to do and later on whenever I set
this you guys are going to easily see
what I'm talking about let me clean this
some like being able to scroll for some
reason you feel so free alright so now
we just need to go ahead and make a form
and all right let's build this step by
step so what is the action of the form
the action is what URL you want to send
this data to and of course we just want
to send it to this right here
but remember instead of just hard coding
this we have that cool shortcut so back
in here all right let me just copy this
because I'm too lazy to type it out and
all right so the action for this is
music favorite so that's the URL pattern
we can go ahead and pass in the album ID
as well because we also need to pass in
the song ID but for the song ID we're
going to be getting it from these inputs
so there you go now another thing
another attribute that we want to add is
the method so the method of this is
going to be post most of your forms of
course are going to be post I assume
that you guys already know about getting
posts so there you go now one other
thing that's kind of weird with Django
is it always is a good idea to have a
CSRF token and I'm going to talk to you
guys about um security and the best
security practices with Django in a
whole nother tutorial but if you guys
just want to look at it a little bit
look up cross-site request forgery and
it's pretty cool topic so CSRF token and
usually whenever you're making websites
this is a pain in the butt to add but
the
thing about Django is whenever you want
to use it in Django you just add that in
Django takes care of everything behind
the scenes pretty cool all right so we
have a form right there so now what we
on do is we want to list through this
album and just loop through every song
and make that choice and we already do
that before so remember that was for
song and album dot song set dot all you
let me just go ahead and end my four and
four alright so we're going to loop
through all of the songs and for each
one what we want to do when we need two
things an input button and that's going
to be the radio button that they click
and also a label and label is just going
to be the title of each song so the user
knows what the heck option you're
selecting so let's go ahead and do our
input first so again I'm just using a
radio button you can use a checkbox if
you want but whatever so of course the
type of this equals radio now the ID is
pretty much just for your HTML so for
the first one it's just going to be song
one and then song - and then song three
so we really don't use it in code but
whenever we have labels we pretty much
give it the same ID so that way it knows
that this input or this radio button is
for that label so you guys are going to
see later on whenever we run the final
site but there you go
so I'm just going to write song and then
for loop counter so again this is going
to get Auto incremented each time it
prints out a song so 1 2 3 4 5 and
that's already built in we don't have to
do anything weird with that now after
this just set name equal to song and
value equal to song ID so let me scroll
so you guys can see so again later on
whenever we actually pass this data all
of the form data to the views function
so we can actually handle it this is
going to be the name or just the
variables name and then this is going to
be the song ID
so will pretty much say get the ID of
whatever song they selected let's say
that this one was 20 and then it's going
to look through the debt base and then
do its thing
alright holy crap what's going on here I
have my font way bumped up for you know
just so I can so just so it looks better
on YouTube and it's kind of hard
whenever I'm program and I never program
with my font this big so that's why it's
that kind of freaking me out all right
so now let's just go ahead and make a
nice little pretty label for the user so
for the label the first thing you write
is this four and this attribute is the
exact same is this
so for song one song to yadda yadda
whatever so again this is mostly just
for display and what do we want to
display in the label well let me just go
ahead and display the song title I
really don't care about the file type I
don't think the user is going to care
about that either so I'll just write
song dot song title now another thing
that I'm going to do is this how does
the user know that their song is
favorited well I'm going to go ahead and
find some star icon online and we'll say
that if a particular song is favorited
then right where this is on the
right-hand side just go ahead and plot
that star logo so whatever favorites
they have it's going to have a nice
yellow star right next to it so how do
we add that logic well it's pretty
simple actually you can go ahead and
copy this
alright so delete this and instead of
checking for if error message we can say
if song is favorite so if the song is
the favorite then what do we want to
happen let me just pause the video and
find some image all right so I actually
just made one real quick alright so if
this song is their favorite then what
we're going to do is we're just going to
plop up this image and I'll show you
guys what this is
know if you guys can even see that oh
it's only a little star so that's why it
looks all fuzzy sixteen by sixteen but
this is gonna appear right next to the
song looking good all right may looking
sweet and actually after this label I'm
going to add a line break in that way
every song is going to appear on a new
line so they do right now because there
are list items and they do that by
default but to ensure that it does that
with form labels just going to add that
line break now the last thing that we
need to do is we actually need to add a
submit button because if we just run it
right now then it's just going to be a
bunch of radio button options in the
user can select one but they can't
submit it so I'll just say input they
bump this in so input the type equals
submit and the value and the value is
just what text you want to appear on the
button I'll just say favorite that has
no effect on your program whatsoever so
there you go
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Oct 24, 2024 Last updated |
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