Angular Material Tutorial - 9 - Progress Spinner

Codevolution

28 Feb 201904:28

Summary

TLDRThis video tutorial introduces the use of progress spinners in Angular Material. It explains the import and utilization of the MatProgressSpinnerModule, detailing the determinate and indeterminate spinners. The determinate spinner is controlled by a value attribute, while the indeterminate spinner continuously spins to indicate background processes. The video also demonstrates how to bind the spinner to a user interface, showing how to manage its visibility during data loading. Additionally, it touches on customizing the spinner's color and suggests exploring the progress bar for further user engagement.

Takeaways

🌟 The script introduces the 'Mat Progress Spinner' module from Angular Material, which contains two types of spinners: 'MatProgressSpinner' and 'MatSpinner'.
🔄 'MatProgressSpinner' is a determinate spinner with a value attribute ranging from 0 to 100, representing the progress percentage.
🚫 A value of 0 for 'MatProgressSpinner' makes the spinner invisible, while a value of 100 shows a complete spinner.
🔄 'MatSpinner' is an indeterminate spinner that spins indefinitely, commonly used to indicate background processes or a busy UI state.
🔧 The script demonstrates how to bind the value attribute of 'MatProgressSpinner' programmatically to convey progress to the user.
🔴 An example is given where a button click triggers data loading, showing the spinner and hiding it after a set time to indicate data has been loaded.
🔵 A new property 'showSpinner' is created and managed within a method to control the visibility of the spinner based on data loading.
🎨 The script mentions the possibility of customizing the spinner's color using the 'color' attribute, with options like 'primary', 'accent', or 'warn'.
🚀 For better user experience, it's suggested to use a separate component with styling like an overlay and z-index when loading data or submitting forms.
🔄 The script briefly mentions the 'ProgressBar' indicator in Angular Material, which works similarly to the progress spinner.
📚 The video aims to educate viewers on using buttons and indicators in Angular Material, with an upcoming video focusing on navigation components.

Q & A

What is the first step in using the progress spinner in Angular Material?
-The first step is to import the MatProgressSpinnerModule from the @angular/material/components array.
How many types of spinner components does the Angular Material module provide?
-The module provides two spinner components: MatProgressSpinner and MatSpinner.
What is the difference between a determinate and an indeterminate spinner?
-A determinate spinner has a value attribute that represents a specific progress percentage, while an indeterminate spinner spins indefinitely without a specific value.
How can you set the value of a determinate spinner in Angular Material?
-You can set the value of a determinate spinner using the value attribute, which can range between 0 and 100.
What does an indeterminate spinner indicate to the user?
-An indeterminate spinner indicates that something is running in the background and the UI is busy, such as loading data or processing information.
How can you programmatically bind to the value attribute of a determinate spinner?
-You can bind to the value attribute by using Angular's data binding features, such as [(value)] or [(ngModel)] to convey progress to the user.
What is the default mode for the Angular Material progress spinner?
-The default mode for the progress spinner is 'determinate'.
How can you change the color of the spinner in Angular Material?
-You can change the color of the spinner by setting the color attribute to 'primary', 'accent', or 'warn'.
What is a recommended practice when using a spinner to indicate data loading?
-It is recommended to use a separate component with styling, such as an overlay and z-index, to prevent user interaction during data loading.
How does the progress bar indicator work in Angular Material?
-The progress bar indicator works almost the same as the progress spinner, providing a visual representation of progress completion.
What navigation-related components will be covered in the next video?
-The next video will cover different components related to navigation in Angular Material.

Outlines

00:00

🌟 Introduction to Progress Spinners in Angular Material

This paragraph introduces the concept of progress spinners in Angular Material, highlighting the two types of spinners available: the determinate spinner and the indeterminate spinner. The determinate spinner is represented by the 'MatProgressSpinner' module, which has a value attribute ranging from 0 to 100, visually indicating the progress percentage to the user. An example is given where the value is set to 40, and the paragraph explains how to hide the spinner by setting the value to 0 or display a complete spinner at 100%. The indeterminate spinner, represented by the 'MatSpinner' component, is used to inform the user that a process is ongoing in the background, such as loading data. The paragraph also discusses the practical use of the spinner in UI, including a demonstration of how to toggle the spinner's visibility programmatically using a button click and a timeout function to mimic data loading. Additionally, the paragraph touches on customizing the spinner's appearance, such as changing its color to accent or warn, and suggests exploring a separate component for more styling options like overlays and z-index.

Mindmap

Keywords

💡progress spinner

A progress spinner is a user interface element that indicates to the user that a process is ongoing, typically by displaying a rotating graphic. In the context of the video, it is a component from the Material Design library that can be programmed to show a determinate progress (with a value between 0 and 100) or an indeterminate progress (spinning indefinitely). The determinate spinner is used to show the percentage of completion of a task, while the indeterminate spinner is used to inform the user that a process is running without specifying the progress.

💡module

In the context of the video, a module refers to a software component that contains a set of functions or features that can be imported and used in a programming environment. The Material Design module mentioned in the video provides various UI components, such as the progress spinner, which can be utilized in an application to enhance the user experience. Modules are essential in modern development as they promote code reusability and organization.

💡value attribute

The value attribute is a property associated with certain HTML elements that allows developers to set or retrieve a value. In the case of the progress spinner in the video, the value attribute is used to define the progress state of the spinner, where it can be set to a number between 0 and 100 to represent the percentage of completion. A value of 0 would mean no progress is shown, while a value of 100 indicates the task is fully completed.

💡indeterminate spinner

An indeterminate spinner is a type of progress indicator that does not convey specific progress information but rather indicates that a process is ongoing. Unlike a determinate spinner, which shows the exact progress, an indeterminate spinner spins indefinitely to inform the user that the application is busy and a task is being processed. This type of spinner is useful when the duration of a task is unknown or variable.

💡binding

Binding in programming refers to the process of linking data or a data source to an element in the user interface. This allows the UI element to be dynamically updated based on changes in the data source. In the context of the video, the value attribute of the progress spinner can be bound programmatically to reflect changes in the progress of a task or process.

💡UI

UI stands for User Interface, which is the space where interactions between users and a program occur. It encompasses all the visual elements and interactive components that allow users to navigate and use the application. In the video, the UI is enhanced by using progress spinners to provide feedback to the user about ongoing processes, such as data loading.

💡button click

A button click is a user action that involves pressing and releasing a button on a user interface. In the context of the video, a button click is used as a trigger for an event, such as模拟数据加载. This action initiates a function or a series of instructions that are executed as a response to the user's input.

💡property

In programming, a property is a characteristic or attribute of an object that can be used to store data or define behavior. In the context of the video, the property 'show spinner' is a boolean value that is used to control the visibility of the progress spinner based on the state of the application, such as whether data is being loaded or not.

💡ng if

NgIf is a structural directive in Angular, a popular web application framework, that adds, removes, or manipulates a portion of the DOM (Document Object Model) based on the truthiness of an expression. It is commonly used to conditionally display elements in the UI, such as showing or hiding components based on certain conditions.

💡color attribute

The color attribute in UI development is used to define the color of an element. In the context of the video, the color attribute can be set to various values such as 'primary', 'accent', or 'warn' to change the appearance of the spinner to match the design theme or to convey different statuses or priorities.

💡navigation

Navigation in web development refers to the process of moving from one page or section to another within an application. It is a critical aspect of user experience design, as it allows users to interact with different parts of the application in a seamless and intuitive manner. The video suggests that the next topic will cover various components and techniques related to navigation within Angular Material.

Highlights

Importing the Mat Progress Spinner module from Angular Material.

Two types of spinners provided by the module: Mat Progress Spinner and Mat Spinner.

Mat Progress Spinner is a determinate spinner with a value attribute ranging from 0 to 100.

Demonstration of a Mat Progress Spinner set to 40% value.

Hiding the spinner by setting the value attribute to 0.

Showing a complete spinner with a value of 100.

Binding the value attribute programmatically to indicate progress.

Introduction to the indeterminate Mat Spinner for continuous spinning.

Use of the indeterminate spinner to indicate background processes or a busy UI.

Creating a 'showSpinner' property and a 'loadData' method to control spinner visibility.

Mocking data loading with a button click and using setTimeout for demonstration.

Using ngIf to conditionally display the spinner based on 'showSpinner'.

Adding a button to trigger data loading and spinner visibility.

Explanation of the behavior change in the UI upon button click to indicate data fetching.

Changing the spinner color to accent using the 'color' attribute.

Brief mention of the progress bar indicator similar to the progress spinner.

Encouragement for users to experiment and understand the progress bar indicator.

Summary of the video content on buttons and indicators in Angular Material.

Anticipation for the next video on navigation components.

Call to action for viewers to subscribe for more content.