Angular Material Tutorial - 8 - Badges

Codevolution
28 Feb 201908:03

Summary

TLDRThis video script introduces the use of material badges in Angular, highlighting their function as UI status descriptors. It explains the process of importing the badge module and demonstrates how to create, position, size, color, and control the overlap of badges. The script also covers conditional rendering and binding values to badges, offering a comprehensive guide to implementing badges effectively in an Angular application.

Takeaways

  • 📌 Familiarity with Bootstrap's material badges for UI elements is beneficial.
  • 🔧 To use Angular Material Badges, import the BadgeModule from '@angular/material/badge'.
  • 📦 Add the BadgeModule to the 'imports' array of the NgModule.
  • 🎨 Create a badge by using the `matBadge` attribute on an HTML element, with the value you wish to display.
  • 🔄 Default badge position is top right of the associated element, but it can be changed using `matBadgePosition` attribute.
  • 🔢 Positional variations include 'above before', 'below before', 'below after', and 'above after'.
  • 📏 Badge sizing can be adjusted with `matBadgeSize` attribute, with options 'small', 'medium', and 'large'.
  • 🎨 Color the badge using `matBadgeColor` attribute, with 'primary', 'accent', and 'warn' as possible values.
  • 🚫 Control badge overlap with text using `matBadgeOverlap` attribute, set to 'false' to avoid overlap.
  • 🔗 Bind badge values dynamically using property binding with the `matBadge` attribute.
  • 🚫 Conditionally render badges based on a condition, e.g., hide the badge when the notification count is zero using `matBadgeHidden`.

Q & A

  • What are material badges used for in UI design?

    -Material badges are used as small status descriptors for UI elements, such as displaying notifications or the number of unread messages in an inbox.

  • How do you import the badge module in Angular Material?

    -To use badges in Angular Material, you first need to import the BadgeModule from '@angular/material/badge' and add it to the MATERIAL_COMPONENTS array.

  • How can you create a basic badge in Angular Material?

    -You can create a basic badge by using the matBadge attribute on an HTML element, such as a span tag, and setting its value to the desired number or text.

  • What are the default and possible positions for a badge in Angular Material?

    -The default position for a badge is above and after the associated element (top right). You can change the position using the matBadgePosition attribute with values like 'below before', 'below after', 'above before', and 'above after'.

  • How can you adjust the size of a badge in Angular Material?

    -You can specify the badge size using the matBadgeSize attribute with possible values being 'small', 'medium' (default), and 'large'.

  • What are the available color options for badges in Angular Material?

    -The background color of a badge can be set using the matBadgeColor attribute with possible values such as 'primary' (default), 'accent', and 'warn'. The actual color is determined by the theme of the application.

  • How does the overlap attribute affect the appearance of a badge in Angular Material?

    -The matBadgeOverlap attribute controls whether the badge overlaps with the text or icon it is associated with. By default, it is set to 'true', but you can set it to 'false' for the badge to not overlap.

  • How can you bind a dynamic value to a badge in Angular Material?

    -To bind a dynamic value such as a number of notifications to a badge, you can use property binding with the matBadge attribute, using square brackets around the property name.

  • How can you conditionally render a badge based on a condition in Angular Material?

    -You can conditionally render a badge using the *matBadgeHidden attribute, which can be bound to a condition, such as 'notifications === 0', to hide the badge when the condition is true.

  • Where can one find the official documentation for Angular Material badges?

    -The official documentation for Angular Material badges can be found at 'material.io' under the 'Components' section, then selecting 'Buttons and indicators' and finally choosing 'Badge' to access the API tab.

  • What is the recommended practice for badge overlap with icons versus text?

    -According to the material documentation, it is advised to overlap badges with icons but avoid overlapping them with text whenever possible.

  • What is the purpose of the matBadgeHidden attribute in Angular Material?

    -The matBadgeHidden attribute is used to conditionally hide the badge based on a certain condition, such as when the number of notifications is zero, to avoid displaying unnecessary or misleading information.

Outlines

00:00

🌟 Introduction to Angular Material Badges

This paragraph introduces the concept of material badges in the context of Angular, drawing a comparison with Bootstrap's badges. It explains that badges are small status descriptors for UI elements, commonly used to display notifications or counts, such as the number of unread messages in an inbox. The paragraph outlines the initial steps to use Angular Material Badges, including importing the Badge module from the Angular Material library and adding it to the material components array. It then demonstrates how to create a basic badge by using the mat-badge attribute on a span tag, with an example of displaying the value '5'. The paragraph also touches on how to customize badges, starting with their position.

05:02

📌 Customizing Badge Position, Size, and Color

This paragraph delves into the customization options available for Angular Material Badges. It begins by explaining how to control the position of badges using the mat-badge-position attribute, with options like 'above and after', 'below and before', 'below and after', and 'above and before'. The paragraph also discusses how to adjust the size of badges using the mat-badge-size attribute, with 'small', 'medium', and 'large' as possible values, and 'medium' as the default. The paragraph then moves on to discuss badge coloring, highlighting how the background color can be set using the mat-badge-color attribute, with 'primary', 'accent', and 'warn' as potential values, all of which are theme-dependent. It emphasizes that while badges can overlap with icons, it's recommended to avoid overlap with text for better readability. The paragraph concludes with a brief mention of binding values and conditional rendering, hinting at how dynamic content can be managed within badges.

Mindmap

Keywords

💡Material Badges

Material Badges are UI elements used in web applications to provide status information or notifications. In the context of this video, they are small status descriptors that can be used, for instance, to display the number of unread messages in an inbox. They are circular and can be positioned in different ways relative to the associated UI element, as demonstrated in the video with various examples.

💡Bootstrap

Bootstrap is a popular front-end framework that provides pre-designed UI components, including badges. For users familiar with Bootstrap, the concept of badges in Angular Material will be similar, as both are used to highlight important information or status updates within an application.

💡Angular Material

Angular Material is a UI framework by Google that provides Material Design components for Angular applications. It includes a wide range of pre-built, customizable UI elements that follow the Material Design guidelines. The video focuses on how to implement and customize badges within this framework.

💡mat badge attribute

The 'mat badge' attribute is a directive in Angular Material used to add badge functionality to an HTML element. By applying this attribute to an element, developers can turn it into a badge that can display numerical values, text, or other status information.

💡Positioning

Positioning refers to the placement of the badge relative to the associated UI element. In Angular Material, the position can be controlled using the 'mat badge position' attribute, which allows developers to place the badge above, below, before, or after the element.

💡Sizing

Sizing in the context of badges refers to the dimensions of the badge element. Angular Material allows for specifying the size of a badge using the 'mat badge size' attribute, with options such as 'small', 'medium' (default), and 'large'.

💡Coloring

Coloring for badges in Angular Material is about setting the background color of the badge, which can be done using the 'mat badge color' attribute. The available values include 'primary', 'accent', and 'warn', with 'primary' being the default. The choice of color is influenced by the application's theme and can help convey different statuses or priorities.

💡Overlapping

In the context of badges, overlapping refers to whether the badge content overlays the associated UI element or not. The 'mat badge overlap' attribute controls this behavior in Angular Material. By default, badges overlap their content, but this can be changed to prevent the badge from overlapping the text or icon it is associated with.

💡Property Binding

Property binding is a concept in Angular where the value of a property in a class is bound to a value in the template. This allows dynamic values to be displayed and updated in the UI. In the context of badges, property binding can be used to link the badge's value to a variable in the component class.

💡Conditional Rendering

Conditional rendering is a technique in Angular that allows developers to display or hide elements based on certain conditions. The 'mat badge hidden' attribute can be used to conditionally render a badge, showing it only when a specific condition is met, such as when the number of notifications is greater than zero.

💡Documentation

Documentation in the context of software development refers to the official guides and reference materials provided by the creators of a framework or library. These resources help developers understand how to use the components and features effectively. In the video, the speaker refers to the Angular Material documentation for more information on implementing and customizing badges.

Highlights

Introduction to material badges in Bootstrap and Angular Material

Badges as status descriptors for UI elements, useful for notifications and unread message counts

Importing the BadgeModule from @angular/material/badge to use material badges

Creating a basic badge with the matBadge attribute on a span tag

Customizing badge position using the matBadgePosition attribute with values like above, after, below, and before

Adding margins to div tags for spacing between badge elements

Adjusting badge sizing with the matBadgeSize attribute, with options small, medium, and large

Changing badge background color with the matBadgeColor attribute, using theme colors like primary, accent, and warn

Controlling badge overlap with the matBadgeOverlap attribute, advised to overlap for icons, not text

Binding dynamic values to badges using property binding in Angular

Conditionally rendering badges based on a condition, e.g., hiding the badge when notifications are zero

Using matBadgeHidden attribute to hide the badge when the condition is met, e.g., notifications equal to zero

Guidance on best practices for badge usage, such as avoiding overlap for text and using it for icons

Reference to official Angular Material documentation for Badges for further reading and API details

Summary of the video content and encouragement for viewers to engage with the content

Transcripts

00:00

let's take a look at material badges in

00:03

this video if you work with bootstrap

00:06

badges should seem familiar to you

00:09

they are basically small status

00:11

descriptors for UI elements for example

00:16

if you have to display notifications for

00:18

a user or the number of unread messages

00:21

in your Inbox badges are the way to go

00:24

so let's see what is possible with

00:27

angular material badges in this video to

00:30

be able to use them we first need to

00:33

import the badge module in material dot

00:37

module dot es import mat badge module

00:42

from angular slash material slash badge

00:46

and then add it to the material

00:49

components array

00:51

now let's create our first badge in AB

00:55

component dot HTML I'm going to include

00:58

a span tag with the text notifications

01:03

to add a badge to the span tag we make

01:07

use of the mat badge attribute

01:12

so mad badge and this attribute is equal

01:16

to the value you want to indicate let's

01:19

go with five if we save this and take a

01:23

look at the browser you should see the

01:25

badge in action the small circular

01:28

element on the top right of the span

01:30

text now this is the most basic badge

01:34

you can have let's see how to customize

01:37

this and let's start with the position

01:40

by default a badge is placed above and

01:45

after the element it is associated with

01:48

that is to the top right we can control

01:52

the position using the mat badge

01:55

position attribute so back in the HTML

01:58

I'm going to make three more copies of

02:01

this div tag

02:06

and I'm going to specify the Matt badge

02:09

position attribute

02:17

below and before

02:21

below and after

02:26

above and before let me also add some

02:30

margin to the div tags to make sure that

02:32

there is enough spacing between the

02:34

elements so div margin three realms now

02:41

if you save the files and take a look at

02:43

the browser you can see the different

02:46

positions above and after below and

02:50

before below and after above and before

02:56

so Matt badge position attribute to

02:59

control the position of the badge next

03:03

let's talk about badge sizing we can

03:06

specify the size using the Matt badge

03:09

size attribute the possible values are

03:12

small medium and large with medium being

03:16

the default value I'm going to make

03:20

three more copies of our notification

03:22

badge and for the first one I'm going to

03:26

add Matt badge size is equal to small

03:31

the second one medium which is also the

03:34

default and for the third one large if

03:39

you now save the file and take a look at

03:41

the browser you can see the badges which

03:43

are small medium and large

03:47

alright next we have badge coloring the

03:51

badge background color can be set using

03:54

the mat badge color attribute possible

03:58

values our primary accent and born with

04:02

primary being the default value the

04:05

color of course is determined by the

04:07

theme your application is using so back

04:11

in vs code I'm going to make three more

04:13

copies of the original notification

04:16

badge

04:20

for the first one I'm going to add math

04:23

badge color is equal to primary which is

04:27

the default for the second one it is

04:30

going to be accent and for the third one

04:32

it's going to be warned if we save this

04:36

and take a look at the browser you can

04:38

see primary accent and worn colors based

04:42

on your theme

04:44

now you might have noticed in all the

04:46

notification badges the badge overlaps

04:49

with the text the overlap flag though

04:53

can be controlled as well we specify the

04:56

Matt badge overlap attribute and set it

04:58

defaults so back in vs code on the last

05:02

badge I'm going to add the attribute

05:06

Matt batch overlap is equal to false if

05:11

you go back to the browser you can see

05:14

that the batch doesn't overlap with the

05:16

text anymore

05:17

in fact material documentation advises

05:21

us to overlap badges for icons and not

05:25

for text for example if you have the

05:28

inbox icon then overlapping might be a

05:31

good choice for text however try

05:34

avoiding overlap as much as possible

05:38

finally let's talk about binding values

05:41

and also conditional rendering the value

05:44

for a batch is usually stored in a class

05:47

property to bind the value we simply use

05:50

property binding so I'm going to open

05:53

app component es and over here I'm going

05:58

to create a new property notifications

06:02

is equal to two and then in the HTML on

06:07

the very first badge I'm going to have

06:10

property binding on the mat batch

06:12

attribute so square brackets for

06:16

property binding and the property we

06:18

want to bind to is notifications

06:23

this property right here so now if we go

06:27

back to the browser

06:28

the very first badge now indicates two

06:32

now sometimes you might also want to

06:34

conditionally render based on the number

06:37

of notifications for example when

06:39

notifications is zero it doesn't really

06:42

make sense to indicate that we rather

06:45

hide the badge itself we can do that

06:49

using Mod Podge hidden attribute so back

06:52

an app component I'm going to add the

06:55

condition property binding with mat

06:58

badge hidden

07:02

and this is going to be equal to the

07:05

condition notifications is equal to zero

07:10

now if we take a look at the browser you

07:15

can still see the badge to go back to vs

07:19

code change the value to zero

07:23

and you can see that the batch is now

07:26

hidden that is how you conditionally

07:29

render a batch in angular material using

07:33

the matte batch hidden attribute alright

07:37

that's pretty much what I have about

07:39

badges

07:40

let me quickly point you to the

07:42

documentation so go to material dot io

07:45

components under buttons and indicators

07:49

there is badge and if you go to the API

07:52

tab you will know what has to be

07:55

imported alright then thank you guys for

07:58

watching don't forget to subscribe I'll

08:00

see you guys in the next video

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Related Tags
Angular MaterialBadge TutorialUI EnhancementNotification DisplayStatus DescriptorsWeb DevelopmentFrontend DesignBadge PositioningBadge SizingBadge ColoringConditional Rendering