32_padding_and_using_data_with_event_binding

Jul 13, 2026 07:19 · 4:37 · English · Whisper Turbo · 1 Luidsprekere

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In the last lecture,

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we had a look at event binding.

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Now before focusing on two -way binding and explaining what this is,

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there's one other important thing you need to know about event binding.

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Let's say before this button,

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we also have a label,

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server name,

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and then more importantly,

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we have an input.

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which we maybe give a bootstrap class of form control.

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Here,

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I want to allow the user to enter the name of the server,

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which should get created.

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So here we could listen to the input event.

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This is a normal DOM event provided by the input element,

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which is fired whenever the user types.

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And here we could execute on update server

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name because it will be fired on every keystroke.

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So let's add this method to our component here.

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I somehow want to output what the user entered right now,

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what the value of this field is.

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Now we can do this by passing dollar sign event

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here.

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And dollar sign event,

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super important,

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is kind of a reserved variable name you can use in the template

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when using event binding.

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For this event,

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so only between these quotation marks here,

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dollar sign event will simply be the

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data emitted with that event.

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So input and click are default events provided by the DOM,

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you could say.

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And they ship us some data when they are fired.

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The click event gives us an object which for example holds the coordinates where we clicked.

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And the input event also gives us some data,

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some information about the event.

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Now we can capture this data with $event passed

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as an argument to the method we're calling or used anywhere

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between these quotation marks in the code we're executing.

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$event,

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something to keep in mind.

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Reserve the word which gives us access to the event data.

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So now we pass this to onUpdateServerName.

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So here we know we will receive this event and this will be

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of type Annie for now.

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So now let's simply log it to the console so

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that we can see it in this debug log.

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If we do this and I

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now type something here,

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watch the console on the right.

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A couple of outputs were written there,

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four to be precise,

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because I typed four characters,

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did four keystrokes,

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so the input event was fired four times.

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And if we have a look at this event,

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we got a couple of information here,

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for example,

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the target.

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And the target simply is the HTML element on which this

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event occurred.

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So here on the target,

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since this is an input element,

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if we scroll down,

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we also got

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the value test.

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And this is what the user entered.

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So what we can do now in our TypeScript code is

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we can set a server name property,

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which is an empty string by default.

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And then here in on update server name,

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instead of logging it,

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we could say this server name.

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And we just learned that on the event,

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which is of type event,

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as we now also saw here,

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we have a target and on the target we have a value.

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Now this is only available because the target is

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of type input element though.

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This is why my ID doesn't like it.

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We can explicitly inform it about the type in TypeScript by adding HTML

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input element here in front of it

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like this.

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And again,

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this is just needed to inform

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TypeScript that we know that the type of the HTML element of

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this event will be an HTML input element.

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We do this explicit casting with this syntax with the opening and

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closing tag with the smaller and greater than sign and the type

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in between.

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So with that,

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we assign this value to our server name.

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What we can now do is in the HTML file here,

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we can output this for now.

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So a string interpolation.

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we could output the server name below the input.

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If we save this and go back to this application and I type

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test server here,

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you see this dynamically updates below the input.

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This is how you can use this $event object

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to fetch the event data.

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Now with that,

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let's move on to two -way data binding to kind of

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finish this little example app here for now.

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