223. Adding Validation to the Form

Jul 22, 2026 00:51 · 2:22 · English · Whisper Turbo · 2 Folës

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Treguesi i leksioneve

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S… Speaker 1 (223. Adding Validation to the Form)

In the last lecture,

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we registered our controls and we made our form submittable.

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So that is what we did then.

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We can still use that form.

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Now I want to add validation.

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For example,

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the name should be required.

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This must not be empty.

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And the same for our number.

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S… Speaker 1 (223. Adding Validation to the Form)

Now it should be a number and due to the fact that this input is of

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type number,

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it should already be hard to enter anything else.

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So with this,

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we now added some validation.

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Now to take advantage of this,

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I want to disable the add button if the form is invalid.

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So we'll bind to disabled here.

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And we'll disable it if form is not valid.

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If this is true.

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So if this check here is true and this will be true if the form is not valid.

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S… Speaker 1 (223. Adding Validation to the Form)

So let's save this.

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S… Speaker 1 (223. Adding Validation to the Form)

And this looks good.

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S… Speaker 1 (223. Adding Validation to the Form)

I can't click the add button.

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S… Speaker 1 (223. Adding Validation to the Form)

Now let's try again.

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S… Speaker 1 (223. Adding Validation to the Form)

Let's insert something into amount.

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S… Speaker 1 (223. Adding Validation to the Form)

This works.

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Of course,

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S… Speaker 1 (223. Adding Validation to the Form)

a negative amount works too though.

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S… Speaker 1 (223. Adding Validation to the Form)

So an easy way of making sure that we may only enter

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numbers greater than zero is to use another built -in validator,

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the pattern validator.

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S… Speaker 1 (223. Adding Validation to the Form)

This will check the user input against a regular expression.

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S… Speaker 1 (223. Adding Validation to the Form)

Now, the regular expression achieving what we're looking for would be the

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following one,

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which needs to be pasted between single quotation marks,

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so as a string,

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it's this one.

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S… Speaker 1 (223. Adding Validation to the Form)

Since it's a string we can also omit these single quotation marks and

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omit the squared brackets to use the shortcut of using property binding

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when binding to a string where we don't have to use the squared brackets So

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what this will basically do this regular expression it will allow any number

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greater than zero So we can see this in action if we now save this

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and go back to the application if I add bread

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And 1,

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this is valid,

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S… Speaker 1 (223. Adding Validation to the Form)

minus 1 doesn't work,

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S… Speaker 1 (223. Adding Validation to the Form)

minus 10 doesn't work,

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S… Speaker 1 (223. Adding Validation to the Form)

minus 0,

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S… Speaker 1 (223. Adding Validation to the Form)

1 doesn't work,

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plus 0,

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S… Speaker 1 (223. Adding Validation to the Form)

1 doesn't work,

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S… Speaker 1 (223. Adding Validation to the Form)

10 does work,

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S… Speaker 1 (223. Adding Validation to the Form)

and 0 does also not work.

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S… Speaker 1 (223. Adding Validation to the Form)

So it does exactly what I wanted to do.

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S… Speaker 1 (223. Adding Validation to the Form)

So now we added validation to this input field.

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S… Speaker 1 (223. Adding Validation to the Form)

Now let's make sure that once we click one of the existing items,

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we actually load that item so that we can edit it.

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