140. Passing Query Parameters and Fragments

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In the last lecture,

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we learned how we can retrieve our route params.

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That's awesome.

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And this is super important,

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something you will probably use a lot.

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Now,

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there are more things you can add to your URL,

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though. You might have query parameters.

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These are the parameters separated by a question mark,

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like mode equals editing,

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anything.

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And you can have multiple ones separated with add signs.

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The question now is how can you pass them using Angular links,

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router links,

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and how can you then retrieve them?

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You might also have a hash fragment,

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so separate it with the hash sign to jump to a specific place in

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your app.

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Loading,

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for example.

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Or maybe you don't really want to use this to jump there.

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You would have to add this,

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scroll down there behavior on your own.

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Maybe you just want to retrieve it to use it as some extra information.

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Let's take a closer look at how we can pass this extra information

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on our links,

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both when using the router link directive and the navigate method

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in code, and how we can then retrieve that information.

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Let's start by passing it first.

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Let's say in our app module,

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we want to add more routes for our service here.

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We also want to add one other route,

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and that would be the route which allows us to

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edit a certain server.

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So we might load a server with some ID and then have slash added

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at the end to describe in the URL what will happen in this component.

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And here it would be the added server component

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we want to load.

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So we added this new route,

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which should load this component in this added server file.

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Now to be able to load this route on my servers component

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here, I want to hook up these links here in this

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list.

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We still have to do the same for the users component later.

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So here I will add my router link and I will

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use the squared bracket syntax again so that I can pass

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an array here because I want to go to slash servers.

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Then let's say server with ID 5.

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We will soon learn how to make this more dynamic.

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and then also edit.

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So this is this newly

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created route I want to call in this case.

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If we save this and we go to

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servers and click on this,

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you see we loaded service 5 edit and the same for every

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link, of course.

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Again, I will change this soon.

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Now let's say we also want to have some query parameter

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deciding on whether we are allowed to edit the server or not.

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So...

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We want to add this question mark,

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and we don't do it by adding question mark equals something here as another

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element in this array.

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Instead,

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when using a link in the template,

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we add a new property of this router link directive.

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We can bind to the query params property.

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Now,

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query params,

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and that's important, is not a new directive.

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It's just another bindable property of the router link directive.

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And here we have to pass a JavaScript object

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And on query perms,

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we can now define key value pairs of the parameters we want to

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edit. So for example,

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say allow edit here and set this to one.

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Now let's see what happens if we now click this link.

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If we now click any link here,

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you see we have question mark allowEdit1 here.

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So that's this key value pair we set up in this object.

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And of course, you could have more key value pairs here,

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which would then be separated with the and sign in between in

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your link.

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So that's the query params property.

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We also have the fragment.

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property and that is only fragment because you may only have one fragment

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here you could simply pass a string with single quotation

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marks or therefore omit the squared brackets and set this

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to let's say loading so if we now save this

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We go back to the service page.

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Now you see we have hash loading at the end.

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This is how you can add a fragment.

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So super easy to add in our router link here

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in our template.

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Let's now see how we can do the same programmatically.

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So in our home component where we already have this load service button,

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let's say we want to load server one.

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So here I will change this name to load server and pass one as an argument maybe.

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Adjust this method here,

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load server,

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and the ID will be passed as an argument as we just saw.

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And here I therefore want to navigate to servers,

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pass the ID.

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We're already seeing how this gets more dynamic.

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Now we're not hard coding five or something like this.

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We're using this argument here instead.

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And then as a last argument,

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edit.

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Now again,

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we still want to add query params and this fragment.

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So here in the navigate method,

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we use this object we already saw where we already added relative to.

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Now I don't need relative to here.

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Instead here,

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I can also set up my query params.

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And that again is then just a JavaScript object where we say allow

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edit and set this to one maybe.

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And just as I added query params,

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I can also add the fragment here and set this to loading.

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Now with this,

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if we save this and we go back to our homepage and click load server,

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you see we add the query parameter,

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allow edit and set it equal to one and the hash

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fragment here.

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So that is how we can use query parameters and fragments on both the

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programmatical routing approach,

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calling it from the TypeScript code.

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or on the router link like here.

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Now let's also learn how we can retrieve the data thereafter.

140. Passing Query Parameters and Fragments

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