36_assignment_solution

Jul 13, 2026 07:20 · 5:12 · English · Whisper Turbo · 2 اسپيڪر

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S… Speaker 1 (36_assignment_solution)

So, were you successful?

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Here's my solution.

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We should add an input field.

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So I'll add a horizontal line again,

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just to have some separation.

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And then my input field.

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The label, of course,

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is optional.

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I want the user to enter a username.

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So let's add an input,

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which receives this class,

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which is form control.

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If we save this and have a look at our application,

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this is how it looks like.

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Now, if you don't want to have it sit directly on the edges,

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you can,

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of course, add some bootstrap styling to this.

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So maybe a container with a row inside of it,

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and then the call XS12 class.

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So feel free to wrap your content in there.

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It's not required for the solution of this,

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of course.

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So with that,

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we got our input field here with the username.

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Now let's bind this username to a property of

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our TypeScript file.

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So here I will add a new property to my app component and

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I will name this property username.

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This will be a string and I will set it to an empty string

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initially like this.

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Now we learned that we can use two -way binding to bind to this.

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So on my input here,

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I'll add two -way binding by adding square brackets

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and then parentheses.

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This is just two -way binding syntax and then ng

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-model.

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Now with that added,

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I can bind to my username like this.

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Now important for ng -model to work,

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you need to make sure that in your app module,

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you have forms module added to the imports because

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the ng -model directive technically is part

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of the forms module provided by Angular.

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So make sure that you have this.

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You should have it there by default when using a CLI project.

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And then with that,

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we should update the username on every keystroke.

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Now to be able to see that,

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I'll add a paragraph below the input,

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and here I want to output username.

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Now with that being output here,

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we can save this,

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ng -surf should be running of course,

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and we should see that if I enter supermax

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here, we see it below the input.

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So the first two tasks here are solved.

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Now let's add the button.

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So we'll add a button below the paragraph where I will say reset

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user.

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And this button will first of all receive some bootstrap

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classes, button,

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button, primary to make it look nice.

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But more importantly,

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we should disable it if the username is empty.

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Now how can we do that?

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We have learned that we can bind to the disabled property.

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Now,

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even though we use that a couple of times,

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that's of course not the only property you can bind to,

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but it's the one we will need here.

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Now,

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disabled.

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We could set disabled to some property which is true or false,

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or we directly set it to true or false.

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But as I explained,

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between the quotation marks,

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you simply have an expression which resolves to a true or false.

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Now,

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since we want to disable this,

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If the username is empty,

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we could simply check that between the quotation marks here.

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So we could say disable this if username,

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this property,

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is equal to an empty string.

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So two single quotation marks inside here.

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With this expression,

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this will return true if username is empty,

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therefore then this button will be disabled,

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otherwise it will be false and the button will be enabled.

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Let's see if this works as expected.

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After saving this,

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the button is indeed disabled at the beginning because username

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clearly is an empty string,

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but as soon as I type anything in here,

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you see it gets enabled.

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So this is how we can use property binding again with any expression which

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returns us the value the property we're binding to expects.

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So in the case of disabled,

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true or false.

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Now with that we get this solved too.

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Now we should also add a click listener to this button so that

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we can reset the username once we do click the button.

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So, event binding with normal parentheses.

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Let's bind to click for this.

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And here we could call onReset a method where

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we then set the username equal to an empty string.

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But since this is all we're going to do,

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I can also just say username equals empty

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string.

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And now don't mistake this for the syntax we used here on the

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disabled property.

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There we have three equal signs to check something.

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Here we have one equal sign to assign a value.

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With this in place,

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we should now be able to go back to the application,

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enter supermax here,

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and if I click reset user,

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it's empty and the button is disabled again because we reset the username

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string.

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And that is our assignment on data binding solved.

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I hope you enjoyed it.

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