26_what_is_databinding

Jul 13, 2026 07:16 · 2:49 · English · Whisper Turbo · 2 Høyttalere

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Øvelsesindeks

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In our little basic first application we're working on,

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where we added a couple of components,

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we covered a lot of key aspects of a basic Angular app,

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how it starts and how to use components,

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the base building block of any Angular app.

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But thus far,

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we only output static content,

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the server component here.

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That's not super interesting.

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We did even more than that in the first section of this course.

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So let's change this.

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to output some data which is kind of dynamic at least,

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which is not hard -coded into the template.

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Time for some data binding.

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What is data binding?

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You could basically translate data binding with communication.

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Communication between your TypeScript code of

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your component,

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your business logic,

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and the template,

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so what the user sees.

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Because you might have some result in your TypeScript code because you fetched something

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from a server or finished some calculation,

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which you want to display to the user.

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And the only thing the user sees is the template.

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So we need some kind of communication between both pieces to be

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able to really,

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well,

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do something in our app.

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That is where data binding comes into play because it is responsible for this communication.

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We get different ways of communication now.

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For example,

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we want to output data from our TypeScript code in the HTML

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code in the template.

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We can use string interpolation for this.

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You saw this in the first section of the course.

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It's the syntax with the double curly braces and then some property name or some expression

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in between.

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Or property binding.

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We will have a closer look at all these forms,

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of course, in the next lecture.

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So we will learn what this then is and how it works.

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The syntax basically uses these strange squared brackets around HTML

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attributes.

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But again,

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I will come back to this.

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Sometimes though,

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the other direction is interesting too.

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If the user clicks a button,

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you can kind of think of the user clicking this button on the template because

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again, the template is the thing with which the user interacts,

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which he sees and where he's also able to click buttons.

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So if we click a button,

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we maybe want to trigger something in our TypeScript code.

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So now we need the other direction.

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And we can get this other direction,

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we can react to user events with event binding.

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So we can bind to for example a click event to execute some

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code whenever it occurs.

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And we also have one additional form of data binding where

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we combine both directions,

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two -way data binding,

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where we are able to react events and output something at the

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same time.

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Might not be super clear how this works,

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but that is why we will now have a detailed look at all four forms

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in the next lectures.

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