236. Validating User Input

Jul 22, 2026 00:52 · 5:10 · English · Whisper Turbo · 2 स्पीकर

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वाचन अनुक्रमणिकाName

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S… Speaker 1 (236. Validating User Input)

We finished our form in its basic form but time to

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S… Speaker 1 (236. Validating User Input)

add some validation to it.

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S… Speaker 1 (236. Validating User Input)

We do add validation of course in our TypeScript code.

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S… Speaker 1 (236. Validating User Input)

Right now there is no validation attached to any of the controls

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S… Speaker 1 (236. Validating User Input)

and that is not really the behavior I want.

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S… Speaker 1 (236. Validating User Input)

When we initialize the form here at the end

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S… Speaker 1 (236. Validating User Input)

of init form for the name for example

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S… Speaker 1 (236. Validating User Input)

I want to add a built -in validator.

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S… Speaker 1 (236. Validating User Input)

So from the validators package,

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which we need to import from addAngularForms.

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S… Speaker 1 (236. Validating User Input)

So from this package,

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S… Speaker 1 (236. Validating User Input)

I want to add the required validator.

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S… Speaker 1 (236. Validating User Input)

Don't execute it.

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S… Speaker 1 (236. Validating User Input)

Don't add parentheses.

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S… Speaker 1 (236. Validating User Input)

You only want to pass a reference to this validator.

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S… Speaker 1 (236. Validating User Input)

So that Angular is able to execute this method at the time it

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S… Speaker 1 (236. Validating User Input)

validates the input.

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S… Speaker 1 (236. Validating User Input)

Now the image path.

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S… Speaker 2 (236. Validating User Input)

That should also be required.

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S… Speaker 2 (236. Validating User Input)

So I'll repeat the procedure here.

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S… Speaker 2 (236. Validating User Input)

Add required,

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S… Speaker 2 (236. Validating User Input)

don't execute it.

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S… Speaker 1 (236. Validating User Input)

And I'll copy it because I also want to require the description.

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S… Speaker 1 (236. Validating User Input)

For the ingredients,

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S… Speaker 1 (236. Validating User Input)

when we create a new ingredient here,

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S… Speaker 1 (236. Validating User Input)

the name should also be required.

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S… Speaker 1 (236. Validating User Input)

And the amount,

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S… Speaker 1 (236. Validating User Input)

here I'm going to add two checks.

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S… Speaker 2 (236. Validating User Input)

The first one is that it's required.

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S… Speaker 1 (236. Validating User Input)

The second element here actually is the pattern validator.

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S… Speaker 1 (236. Validating User Input)

And here we can copy the pattern we used in the shopping edit

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S… Speaker 1 (236. Validating User Input)

component.

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S… Speaker 1 (236. Validating User Input)

This regular expression here,

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S… Speaker 1 (236. Validating User Input)

it's the same expression I want to validate here that we only have positive

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S… Speaker 1 (236. Validating User Input)

numbers.

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S… Speaker 1 (236. Validating User Input)

Here in pattern,

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S… Speaker 1 (236. Validating User Input)

you simply pass a regular expression by

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S… Speaker 1 (236. Validating User Input)

putting two forward slashes and in between your expression.

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S… Speaker 1 (236. Validating User Input)

without any quotation marks here.

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S… Speaker 2 (236. Validating User Input)

So that is the pattern.

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S… Speaker 1 (236. Validating User Input)

And we do execute this method because this acts like the factory.

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S… Speaker 1 (236. Validating User Input)

It gives us back the configured validator then,

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S… Speaker 1 (236. Validating User Input)

which will be used by Angular.

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S… Speaker 1 (236. Validating User Input)

But to configure it,

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S… Speaker 1 (236. Validating User Input)

we need to pass an argument,

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S… Speaker 1 (236. Validating User Input)

right? We need to tell it what should be our pattern.

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S… Speaker 1 (236. Validating User Input)

So that are the validators for a new

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S… Speaker 1 (236. Validating User Input)

form control in the array,

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S… Speaker 1 (236. Validating User Input)

for the new amount control,

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S… Speaker 2 (236. Validating User Input)

I should say.

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S… Speaker 1 (236. Validating User Input)

Let's also copy that to the on add ingredient method where we also

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S… Speaker 1 (236. Validating User Input)

create a new form array form group.

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S… Speaker 1 (236. Validating User Input)

So here I will set the default values to null and

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S… Speaker 1 (236. Validating User Input)

then also add my validators and the same for the name should

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S… Speaker 1 (236. Validating User Input)

have an empty default value and then here just

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S… Speaker 2 (236. Validating User Input)

the required validator.

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S… Speaker 1 (236. Validating User Input)

So now validation should be added to the form successful and

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S… Speaker 1 (236. Validating User Input)

to use it I will disable the save button if

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S… Speaker 1 (236. Validating User Input)

the form is not valid.

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S… Speaker 1 (236. Validating User Input)

So I will bind to disabled and check

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S… Speaker 1 (236. Validating User Input)

if recipe form is not valid.

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S… Speaker 2 (236. Validating User Input)

Well let's see if this reloads

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S… Speaker 2 (236. Validating User Input)

we should see.

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S… Speaker 1 (236. Validating User Input)

that the save button gets disabled,

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S… Speaker 2 (236. Validating User Input)

I would say,

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S… Speaker 2 (236. Validating User Input)

but right,

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S… Speaker 1 (236. Validating User Input)

we got a valid form here.

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S… Speaker 1 (236. Validating User Input)

So let's empty the name and it's disabled,

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S… Speaker 2 (236. Validating User Input)

that looks good.

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S… Speaker 1 (236. Validating User Input)

Let's now empty the description,

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S… Speaker 1 (236. Validating User Input)

disabled,

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S… Speaker 2 (236. Validating User Input)

the URL,

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S… Speaker 1 (236. Validating User Input)

disabled or any control here.

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S… Speaker 1 (236. Validating User Input)

So the name of this ingredient or maybe the

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S… Speaker 1 (236. Validating User Input)

number or a negative number.

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S… Speaker 1 (236. Validating User Input)

So that all seems to work.

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S… Speaker 1 (236. Validating User Input)

The validation state is successfully taken into account.

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S… Speaker 1 (236. Validating User Input)

Now to finish the validation,

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S… Speaker 1 (236. Validating User Input)

I'll go to my CSS sheet and I want to mark

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S… Speaker 1 (236. Validating User Input)

invalid inputs.

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S… Speaker 1 (236. Validating User Input)

Now we get this handy ngInvalid class,

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S… Speaker 1 (236. Validating User Input)

which is added to anything which is invalid.

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S… Speaker 1 (236. Validating User Input)

And that's the problem.

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S… Speaker 1 (236. Validating User Input)

If I add a border of let's say one pixel solid and red,

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S… Speaker 2 (236. Validating User Input)

well,

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S… Speaker 2 (236. Validating User Input)

watch for yourself.

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S… Speaker 1 (236. Validating User Input)

If I remove that,

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S… Speaker 1 (236. Validating User Input)

not only is the name input field invalid,

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S… Speaker 1 (236. Validating User Input)

the whole form is.

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S… Speaker 1 (236. Validating User Input)

So the whole form has this ugly border.

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S… Speaker 1 (236. Validating User Input)

Well,

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S… Speaker 1 (236. Validating User Input)

we can simply change this to assign

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S… Speaker 1 (236. Validating User Input)

ng or assign this class,

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S… Speaker 2 (236. Validating User Input)

this style I should say,

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S… Speaker 1 (236. Validating User Input)

only to elements with have the ng -invalid class,

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S… Speaker 1 (236. Validating User Input)

but which also are an input.

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S… Speaker 1 (236. Validating User Input)

or optionally,

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S… Speaker 1 (236. Validating User Input)

to be very explicit here,

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S… Speaker 1 (236. Validating User Input)

a text area in our case here with ng -invalid.

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S… Speaker 1 (236. Validating User Input)

So with this now,

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S… Speaker 1 (236. Validating User Input)

we should make sure that if I remove this,

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S… Speaker 2 (236. Validating User Input)

only the box itself receives the red border.

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S… Speaker 1 (236. Validating User Input)

To prevent this from having the red border right from the start,

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S… Speaker 1 (236. Validating User Input)

I'll also add ng -touched here as a check or

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S… Speaker 2 (236. Validating User Input)

as a class which has to be present,

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S… Speaker 1 (236. Validating User Input)

so that we at least had to click into that control to mark

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S… Speaker 1 (236. Validating User Input)

it as invalid.

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S… Speaker 1 (236. Validating User Input)

You will see what I mean if I add a new recipe.

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S… Speaker 2 (236. Validating User Input)

Everything is clean.

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S… Speaker 1 (236. Validating User Input)

If I click in here and out of there,

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S… Speaker 1 (236. Validating User Input)

now it has the red border.

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S… Speaker 1 (236. Validating User Input)

So that is validation working as it looks to me.

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S… Speaker 1 (236. Validating User Input)

Now let's make sure that we can actually submit a form and save it

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S… Speaker 2 (236. Validating User Input)

or successfully update it.

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