Angular Material Tutorial - 26 - Dialog

Codevolution
15 Apr 201909:35

Summary

TLDRThis video tutorial offers a comprehensive guide on implementing dialogues in Angular with Material Design. It begins with importing the necessary modules and setting up the HTML to trigger a dialogue. The video then delves into defining the 'openDialogue' method, utilizing the Mat Dialog service, and creating a 'dialog-example' component. It covers structuring the dialogue content with specific directives, handling button clicks with 'matDialogClose', and using 'afterClosed' observable for different outcomes. Finally, it explains passing data to the dialogue component and adjusting its height and width as needed. The tutorial is a valuable resource for those looking to enhance their Angular applications with interactive and dynamic dialogues.

Takeaways

  • 🚀 Dialogues in Angular Material are a type of modal window used for user interaction.
  • 📦 To implement a dialog, first import the MatDialogModule and add it to the material array.
  • 🔨 Create a button in the HTML with the mat-raised-button attribute and a click handler to open the dialog.
  • 🛠️ Inject the MatDialog service into the component constructor to use it for opening dialogs.
  • 📝 Define the openDialog method using this.dialog.open to display the dialog.
  • 🔄 Use the Angular CLI to generate a new component for the dialog with the command 'ng g c'.
  • 🎯 Include the generated component in the entryComponents array for it to be usable in dialogs.
  • 🏷️ Use the mat-dialog-title, mat-dialog-content, and mat-dialog-actions directives to structure the dialog content.
  • 🔐 Add the matDialogClose directive to buttons to close the dialog upon user interaction.
  • 📊 Utilize the afterClosed observable to handle the result of the dialog based on user actions.
  • 📌 Pass data to the dialog component by including it as the second parameter in the open method.
  • 📐 Configure the dialog's height and width through the configuration object for customization.

Q & A

  • What is a dialogue in Angular Material?

    -A dialogue in Angular Material is a type of modal window that appears in front of the app content to provide information or ask for information.

  • How is the usage of a dialog similar to the snack bar component?

    -The usage of a dialog is similar to that of the snack bar component because both are used to present information or requests to the user in a temporary, non-intrusive manner.

  • What is the first step in implementing a dialog in Angular Material?

    -The first step in implementing a dialog is to import the MatDialog module and add it to the material array.

  • How do you create a button to open a dialog in Angular Material?

    -You create a button with the attribute `mat-raised-button` and add a click handler with the method `openDialogue`. The button text should be 'Open Dialogue'.

  • What service is required to open a dialog in Angular Material?

    -The `MatDialog` service from `@angular/material` is required to open a dialog.

  • How do you define the 'openDialogue' method in Angular Material?

    -You define the 'openDialogue' method by injecting the MatDialog service into the component's constructor and then using the `dialog.open` method within the method body.

  • What is the purpose of the 'entryComponents' array in Angular Material dialogs?

    -The 'entryComponents' array is used to include components that are used for dialogs, ensuring that they are properly loaded and available for use within the application.

  • How do you structure the content of a dialog using Angular Material directives?

    -You can use directives such as `matDialogTitle` for the title, `matDialogContent` for the content, and `matDialogActions` for the actions (buttons) within the dialog.

  • What is the 'afterClosed' observable used for in Angular Material dialogs?

    -The 'afterClosed' observable is used to perform actions after the dialog is closed, such as logging the result of the user's choice (e.g., staying logged in or logging out).

  • How do you pass data to a dialog component in Angular Material?

    -You pass data to a dialog component by specifying it as the second parameter to the `dialog.open` method, and then using the `MAT_DIALOG_DATA` injection token to access the data within the dialog component.

  • Can you customize the height and width of a dialog in Angular Material?

    -Yes, you can customize the height and width of a dialog by passing a configuration object with the desired properties to the `dialog.open` method.

Outlines

00:00

📌 Introduction to Angular Material Dialogs

This paragraph introduces the concept of dialogues in Angular Material, explaining that they are a type of modal window used to present information or prompt for input. It compares their usage to that of the snack bar component previously discussed. The paragraph outlines the steps to implement a dialogue, starting with importing the MatDialogModule and creating a button in HTML to open the dialogue. It then describes defining the openDialogue method, utilizing the MatDialog service from Angular Material. The process includes generating a component using the Angular CLI, configuring it, and testing the dialogue functionality in the browser.

05:03

🔄 Handling Dialogue Results and Passing Data

This paragraph delves into handling the results of a dialogue and the process of passing data to a dialogue component. It explains using the afterClosed observable to capture the result when a dialogue is closed, allowing actions based on whether the user chooses to stay logged in or log out. The paragraph also covers how to pass data to the dialogue component by including it as a second parameter in the open method and injecting it using the MAT_DIALOG_DATA token. The summary touches on the ability to customize the dialogue's appearance, such as setting height and width, and encourages further exploration of the Angular Material documentation for additional properties and options.

Mindmap

Keywords

💡Angular

Angular is an open-source, framework by Google, used by millions of developers for building single-page applications. In the context of this video, Angular is the platform where the dialogues and material components are being implemented, specifically referring to Angular Material which is a UI framework that combines Angular's reactiveness with Material Design.

💡Dialogues

Dialogues, in the context of this video, refer to modal windows that appear on top of an application's content to provide information or prompt the user for input. They are a key component in user interface design and are used to engage users without disrupting the flow of the main application.

💡Material Design

Material Design is a design language developed by Google, that dictates the use of grid-based layouts, responsive design, and depth effects such as lighting and shadows. It is applied here in the form of Angular Material, which is a library of Angular components that adhere to the Material Design guidelines.

💡Modal

A modal is a user interface element that requires users to interact with it before they can access the rest of the application. It is often used for tasks such as login prompts, alerts, or data input forms. In this video, the term is used to describe the nature of dialogues, which are a type of modal window.

💡Component

In the context of Angular, a component is a piece of code that encapsulates functionality and can be reused throughout an application. Components are the building blocks of an Angular app, and they can include HTML, CSS, and logic.

💡MatDialog

MatDialog is a service in Angular Material that facilitates the creation and management of dialogues within an application. It is used to display modal windows that can contain various types of content and actions.

💡Button

A button is a user interface element that users click to trigger an action or event. In web applications, buttons can be styled and programmed to perform a variety of functions, such as opening dialogues, submitting forms, or navigating to different pages.

💡Directives

Directives in Angular are markers on a DOM element that tell Angular to perform certain actions or transformations on that element. They are used to bind data, manipulate the DOM, or integrate with other Angular features.

💡Observable

In the context of Angular and RxJS, an observable is a collection of values and events that can be subscribed to, allowing components to react to changes over time. Observables are a key concept in reactive programming and are used extensively in Angular for managing asynchronous data flow.

💡Data Injection

Data injection is a software design pattern where the dependencies of a class are supplied through its constructor or other external means, rather than being created within the class itself. This promotes modularity and makes the code more maintainable and testable.

💡Configuration

Configuration in software development refers to the process of setting up and defining the parameters and settings for a system or application. In the context of this video, it relates to customizing the behavior and appearance of dialogues in Angular Material.

Highlights

Exploring dialogues in Angular Material, a modal window used for interaction.

Similarity between dialogues and snack bar components in Angular Material.

Importing the Mat Dialogue module and adding it to the material array.

Creating a button in HTML with the attribute mat-raised-button to open the dialogue.

Defining the openDialogue method and injecting the Mat Dialog service.

Using Angular CLI to generate a new component for the dialogue with ng generate component.

Including the dialogue component in the entryComponents array for usage in dialogues.

Structuring dialogue content with specific directives like mat-dialog-title, mat-dialog-content, and mat-dialog-actions.

Adding the mat-dialog-close directive to buttons for closing the dialogue upon click events.

Utilizing the afterClosed observable to handle button click events and determine user actions within the dialogue.

Assigning a value to the matDialogClosed directive to indicate the user's choice in the dialogue.

Passing data to the dialogue component using the dialogue open method and Mat Dialogue Data injection token.

Accessing and displaying passed data within the dialogue component using interpolation.

Customizing the dialogue box with properties like height and width through the configuration object.

Encouraging further exploration of the API documentation for additional properties and customization options.

Providing a comprehensive understanding of working with dialogues in Angular Material for practical applications.

Transcripts

00:00

alright guys in this video we are going

00:02

to take a look at dialogues in angular

00:04

material a dialogue is a type of modal

00:08

window that appears in front of the app

00:10

content to provide information or ask

00:13

for information the usage of a dialog is

00:18

very similar to that of the snack bar

00:20

component we looked at in the last video

00:23

so this video should be pretty

00:25

straightforward if you've understood how

00:28

a snack bar works alright let's get

00:31

started

00:32

first step import mat dialogue module

00:37

and add it to the material array next in

00:41

the HTML create a button that can open

00:45

the dialogue so button add the attribute

00:50

mat rais'd button add a click handler

00:57

which is open dialogue and then the

01:03

button text is going to be open dialogue

01:07

now let's define the open dialogue

01:09

method

01:12

to be able to actually open the dialogue

01:15

we need the Matt dialog service so

01:19

import Matt dialog from angular slash

01:22

material after importing we need to

01:26

inject it

01:26

so constructor let's go with public

01:31

dialog of type Matt dialog and then we

01:36

can define the open dialogue method

01:40

within the body we are going to have

01:42

this dot dialogue dot open and the open

01:48

method on dialogue accepts two

01:51

parameters the first parameter is a

01:54

component and the second parameter is

01:57

optional configuration to pass in a

02:01

component parameter let's first create

02:03

it so in the terminal we use angular CLI

02:08

and run the command ng G for generate C

02:13

for component and the name of the

02:15

component which is going to be dialogue

02:17

- example and I'm also going to skip the

02:22

test files the command creates a folder

02:25

for the component and adds it to the app

02:28

module but a component that is used for

02:31

a dialogue also has to be included in

02:34

the entry components array so over here

02:38

dialog example component now we can pass

02:43

this component as our parameter so nav

02:45

dot component es this dot dialogue dot

02:49

open and the first parameter is going to

02:52

be dialog example component

02:56

all right let's go back to the browser

02:57

and test this out if I click on the

03:01

button a dialog pops up with the content

03:05

dialog example works and this is the

03:09

HTML corresponding to our dialog example

03:12

component right now we just have a

03:16

paragraph tag but there are several

03:18

directives meant specifically to

03:21

structure the dialogue content let's use

03:24

them instead so envious code I'm going

03:27

to open the file dialog example dot HTML

03:30

and first we specify a dialogue title

03:36

using the mat dialogue title directive

03:39

so I'm going to add an h2 tag and the

03:44

directive is going to be mat dialogue

03:47

title this is going to be session

03:52

timeout next for the content we have mat

03:57

dialogue content so this is going to be

04:00

Matt dialogue content and the text is

04:05

going to be you will be logged out due

04:09

to inactivity next for the dialogue

04:12

action we have the mat dialogue actions

04:16

let's create two buttons one to stay

04:20

signed in and want to log out so keep me

04:24

logged in or log out now on both these

04:28

buttons if you want the click event to

04:31

close the dialogue we need to add the

04:34

mat dialogue close directive so on both

04:37

the buttons mat dialogue close

04:42

alright let's test this out if you go

04:45

back to the browser and I click on the

04:47

button we have the model with the title

04:51

content and the buttons when I click the

04:56

button it closes the dialogue as well

04:59

now we have two buttons intended for

05:02

different purposes how would we know

05:05

whether to log the user out or keep them

05:08

signed in when the dialog closes on the

05:11

button click we can do that using the

05:15

after closed observable which

05:17

conveniently returns a result

05:20

so back in vs code in the component

05:23

class first create a reference to the

05:26

dialogue so let dialogue ref is going to

05:30

be this dot dialogue dot open now we can

05:35

subscribe to the observable dialogue ref

05:39

dot after closed dot subscribe we get a

05:45

result and let's simply log that to the

05:49

console dialog result is result finally

05:57

we assign a value to the mat dialogue

06:00

closed directive which is accessed as

06:02

the result so in the HTML for the

06:06

dialogue on keep me logged in button mat

06:10

dialogue closed

06:12

is going to be equal to true for the

06:18

first case and false for logout let's go

06:24

back to the browser and test this out

06:25

I'm going to open the console click on

06:30

open dialogue and click on keep me

06:33

logged in you can see that it says

06:36

dialogue result true and click on log

06:39

out

06:40

it says dialogue result false so in the

06:45

subscription method you can have the

06:47

code that checks for the result if

06:49

result is equal to true keep them signed

06:52

in and if result is equal to false log

06:56

the final point to discuss with

06:59

dialogues is passing in the data to the

07:02

dialogue component and there are a

07:05

couple of steps so let's go over each of

07:07

them the first step specify the data as

07:11

the second parameter to the dialogue

07:14

open method so this is going to be an

07:17

object the key is going to be data which

07:21

in turn is going to be an object I'm

07:23

going to pass a name called vishwas so

07:29

this is the second argument to the open

07:31

method next open the component class for

07:35

the dialogue example component so

07:37

dialogue example component dot TS to

07:42

access the data in the dialogue

07:44

component we have to use the mat

07:47

dialogue data injection token so first

07:52

import inject from angular slash core

07:56

next import mat dialogue data from

08:01

angular slash material and then we

08:04

inject it in the constructor so

08:07

constructor is going to be at inject and

08:11

we are injecting mat dialogue data and

08:16

then we say public data of type ami so

08:22

basically we are now making the dialogue

08:24

component capable of receiving any type

08:27

of data now in the dialogue component

08:30

HTML we can simply interpolate the data

08:33

object so in math dialogue content I'm

08:36

going to add high data dot name if you

08:42

now go back to the browser and click on

08:45

open dialogue you can see that content

08:48

says Huayra choise you will be logged

08:51

out due to inactivity so we are able to

08:54

pass data to the dialogue component now

08:58

if you want to specify height and width

09:01

for the dialogue it can be passed into

09:04

the configuration object there are a

09:08

bunch of properties you can use

09:09

based on your requirement so I leave

09:12

that for you guys to explore browse the

09:15

API tab in the documentation and you

09:17

will find everything you need alright I

09:21

hope you now have a good understanding

09:23

of how to work with dialogues in angular

09:26

material thank you guys for watching

09:29

don't forget to subscribe and from the

09:31

next video let's get started with data

09:33

tables

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