28_property_binding

Jul 13, 2026 07:18 · 6:34 · English · Whisper Turbo · 1 ลำโพง

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In the last lecture,

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we had a look at string interpolation,

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which is a great tool for outputting data in a template.

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Now I want to have a look at property binding.

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Now,

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one important information right away,

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there are a lot of times where you can either use

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property binding or string interpolation.

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And I will show what I mean in a second.

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Let's go to our servers component where we manage all the servers.

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And I want to allow the user to add new servers.

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At least soon I want to allow that.

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So we will need a button where I say add

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server on it.

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And I would just add some CSS classes button and button primary to make this

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button look nice.

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This is all using normal bootstrap CSS classes though.

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Nothing to do with Angular.

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And to reflect this change in my servers component here.

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I also want to comment out the inline template and point to the external template

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again.

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So template URL should point to my servers

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component dot HTML file like

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this.

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So now with this,

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if I save this,

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we see that button here.

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Right now,

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it doesn't make any sense that I'm able to click this button because it

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doesn't do anything.

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We haven't learned to react to a button click yet.

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So I will add a new property in my TypeScript code

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here.

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which I'll name allow new server and set it to false.

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So now this is also another property holding a Boolean value.

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So true or false,

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in this case false,

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because I don't want to allow the user to create a new server.

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And you could again imagine that this is somehow derived dynamically.

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We will soon work with some dynamic data.

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So in the HTML file here,

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I now want to disable the button.

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And as you probably know,

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there is a disabled attribute you can add,

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like this.

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If we now save this,

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the button is disabled,

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I can't click it.

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That's nice,

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but that's hard -coded into HTML.

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Now maybe this allow new server code

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here changes,

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however.

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Maybe it's not set to this all the time.

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So then we wouldn't be able to react to this.

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And I can actually demonstrate this.

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but for now in the constructor which is simply a method executed at the point of

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time this component is created by angular

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By there calling setTimeout a normal JavaScript function.

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And here I define after which period of time or after

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how many milliseconds something should happen.

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So after 2000 milliseconds,

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which are two seconds,

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I want to execute a function.

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And here I'm using an ES6 arrow function.

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This syntax might look strange.

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It's almost the same as function like this with

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some difference when it comes to handling the this keyword.

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But in the end,

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here you pass the arguments and here you have the function body.

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More importantly,

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in here, I can set allow new server.

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And now this would not work in the other syntax because this would then be referring

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to something else.

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Can set it to true.

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So after two seconds,

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this will be switched to true.

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And since we hardcoded this,

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of course,

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this doesn't affect our button here at all.

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It stays disabled.

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So I want to bind it to allow new server.

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So now to make this disabled functionality dynamic,

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we can bind to it by enclosing it in square brackets.

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Square brackets indicate to Angular that we're using property

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binding, that we want to dynamically bind some property.

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And disabled,

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the HTML attribute,

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in the end,

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in normal HTML,

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only sets a specific property on the underlying

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DOM element.

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You might know that each HTML element you use is parsed by the

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browser and kind of translated into an element on the document object

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model.

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This is totally unrelated to Angular.

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And therefore,

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we have an element in this DOM.

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And this element has a couple of properties.

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A lot of these can't even be set through attributes on the HTML

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element.

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Well, one of the properties is the disabled property,

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and you can set it through the disabled attribute,

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but here we're not using the disabled attribute anymore.

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With these squared brackets,

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we are directly binding to this native disabled

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property this HTML element has.

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So now we can set this equal to,

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and now between the quotation marks here,

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an expression which for this property

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resolves to a Boolean,

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but for other properties,

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another type might be required.

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Because again,

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you can bind to a lot of properties,

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basically to all the HTML element properties.

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we'll soon learn that there are also other properties you can bind to.

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So for now I can simply pass allow new server here,

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my property name,

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because this will resolve to true or false exactly

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the value disabled the property needs because it has to decide whether

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it should be disabled or not.

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So now with that,

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if we

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So by adding an exclamation mark,

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we made sure that this is only disabled if this is false.

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So if allow new server is not true,

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otherwise we would do exactly the opposite.

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So now with the exclamation mark,

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if we go back to the app,

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you see it's disabled.

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but after two seconds let me reload this it becomes enabled because

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now we're binding to this disabled property this native

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element property we're binding this to our own typescript property

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here and the convenient thing is and this is what angular

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is all about that this will update dynamically so once

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allow new server changes

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This is changed in the DOM,

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so now the button gets enabled.

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One of the main reasons why you use Angular,

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it makes it very easy for you to interact with your DOM

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to change some things there at runtime,

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like we do here.

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That is property binding in place.

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Now, as I mentioned,

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besides binding to HTML element properties,

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like we do here,

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you can also bind to other properties,

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for example,

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of directives,

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something we haven't learned about yet,

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and your own components,

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something I will also show you later.

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So this is property binding.

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Before moving on to the other two forms of data binding,

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let's find out where you could actually use string interpolation

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instead of property binding.

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