ng-if-block-ui
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    1.0.2-5.1 • Public • Published

    NG Block UI

    A Block UI implementation for Angular

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    Installation

    Add to your project via npm

    npm install ng-if-block-ui --save

    Include the BlockUIModule in your main app module.

    // All other imports
    import { BlockUIModule } from 'ng-if-block-ui';
    
    @NgModule({
      imports: [
        BlockUIModule.forRoot()
      ],
      ...
    })
    export class AppModule { }

    Quick Start

    Wrap your main components in your app root template with a block-ui component.

    Import the BlockUI decorator into your component and declare a property with the decorator. This decorator will auto wire this property to the main Block UI instance of your app.

    To start blocking your app, simply invoke the start method. This method also can take a custom message to display while blocking. Once finished call the stop method to stop blocking the app.

    import { Component } from '@angular/core';
    
    // Import BlockUI decorator & optional NgBlockUI type
    import { BlockUI, NgBlockUI } from 'ng-if-block-ui';
    
    @Component({
      selector: 'app-root',
      template: `
        <block-ui>
          <!-- Your app markup here -->
        </block-ui>
      `
    })
    export class AppComponent {
      // Decorator wires up blockUI instance
      @BlockUI() blockUI: NgBlockUI;
    
      constructor() {
        this.blockUI.start('Loading...'); // Start blocking
    
        setTimeout(() => {
          this.blockUI.stop(); // Stop blocking
        }, 2000);
      }

    Settings

    Settings can be changed on the module level and component/directive level. Also, in some cases settings can be overwritten via the method level.

    Default Message

    A default message can be configured to be shown instead of passing a message each time to the start method. The default message will be shown any time blocking is activated.

    Setting Type Description
    message string Custom message to be displayed while blocking.

    Module Level

    @NgModule({
      imports: [
        BlockUIModule.forRoot({
          message: 'Default Message'
        })
      ],
      ...
    })
    export class AppModule { }

    Component Level

    <block-ui message="Default Message">
      <!-- Markup here -->
    </block-ui>

    Method Level

    @Component({
      ...,
      template: `
        <block-ui message="Default Message">
          <!-- Your markup here -->
        </block-ui>
      `
    })
    export class Cmp {
      @BlockUI() blockUI: NgBlockUI;
    
      defaultMessage() {
        this.blockUI.start(); // "Default Message" will display
      }
    
      customMessage() {
        this.blockUI.start('Updating...'); // "Updating..." will display
      }
    }

    Delay Start/Stop

    When blocking with fast service calls the block overlay can flicker for a small amount of time. To prevent this a delayStart and a delayStop can be configured to prevent this scenario.

    Setting Type Description
    delayStart number Waits given amount of milliseconds before starting to block.
    delayStop number Waits given amount of milliseconds before stopping current block.

    Module Level

    @NgModule({
      imports: [
        BlockUIModule.forRoot({
          delayStart: 500,
          delayStop: 500
        })
      ],
      ...
    })
    export class AppModule { }

    Component Level

    <block-ui [delayStart]="500" [delayStop]="500">
      <!-- Your app markup here -->
    </block-ui>

    Custom Template

    If you want to display other markup than the default spinner and message then you can provide a custom template. Custom templates can be provided as a Component or TemplateRef. The template will then be used instead of the default template whenever blocking.

    Setting Type Description
    template Component | TemplateRef Custom template to be used when blocking

    Component Custom Template

    Create a component and declare it in your app module. The component also will need to be added to the entryComponents property of the module.

    Example Component:

    Note: When providing a Component as a template just add the {{message}} interpolation to your template and it will display your default message or the message passed to the start method.

    // Template component
    // Use block-ui-template class to center div if desired
    @Component({
      template: `
        <div class="block-ui-template">
          <img src="logo.png" />
          <p>{{message}}</p>
        </div>
      `
    })
    export class BlockTemplateCmp {}
    Module Level
    @NgModule({
      imports: [
        BlockUIModule.forRoot({
          template: BlockTemplateCmp
        })
      ],
      declarations: [
        ...,
        BlockTemplateCmp // Declare template component
      ],
      entryComponents: [ BlockTemplateCmp ]
    })
    export class AppModule { }
    Component Level
    @Component({
      selector: 'app-root',
      template: `
        <block-ui [template]="blockTemplate">
          <!-- Your markup here -->
        </block-ui>
      `
    })
    export class AppComponent {
      // Declare template component
      blockTemplate: BlockTemplateCmp = BlockTemplateCmp;
    }

    TemplateRef Custom Template

    Add a <ng-template> with a template reference variable to the view. Then pass the template reference variable to the blockUI component using the [template] property.

    Note: TemplateRef templates can only be set on a Component level.

    Component Level
    @Component({
      selector: 'cmp',
      template: `
        <ng-template #blockTemplate>
          <div class="block-ui-template">
            <img src="logo.png" />
          </div>
        </ng-template>
    
        <block-ui [template]="blockTemplate">
          <!-- Your app markup here -->
        </block-ui>
      `
    })
    export class Cmp {}

    Block UI Directive

    Sometimes you want to only apply blocking to a certain element in your app. The Block UI directive can be added to an element to apply blocking only to that specific element.

    Add the *blockUI structural directive to any element and pass it an instance name *blockUI="'contact-list'".

    Then in a component create a class property using the Block UI decorator with the instance name @BlockUI('contact-list'). This will then take care of wiring up that property to point to that specific instance in your app.

    @Component({
      selector: 'app-cmp',
      template: `
        <div>
          <div *blockUI="'contact-list'">
            <!-- List markup -->
          </div>
        </div>
      `
    })
    export class AppComponent {
      // Pass instance name to decorator
      @BlockUI('contact-list') blockUIList: NgBlockUI;
    
      constructor() {
        this.blockUIList.start('Loading...'); // Start blocking element only
        this.blockUIList.stop(); // Stop blocking
      }

    Directive Settings

    Angular has a specific syntax for passing properties to structural directives. Properties are passed in key: value; pair. To pass settings to a Block UI directive they must be passed as shown below.

    <div *blockUI="'instance-name'; message: 'Loading'; template: blockTemplate">
    </div>

    NgBlockUI Instance

    Below highlights all the properties that can be found on a BlockUI instance when a class property is decorated with the @BlockUI() decorator.

    Property Description
    name Name of the targeted instance (defaults to main instance).
    isActive Indicates if the targeted instance is blocking.
    start Starts blocking for instance, can be passed an optional message.
    stop Stops blocking for instance.
    reset Stops blocking for all currently blocking instances app wide regardless of the delayStop option.
    update Updates current instances blocking message with the passed message.
    unsubscribe Unsubscribe an instance so it no longer can be blocked. All BlockUI components/directives unsubscribe by default during onDestroy

    BlockUIService

    In some cases you may want to have more control over all the instances in you app. Instead of declaring seperate instances with the @BlockUI() decorator you can use the BlockUIService. This service allows you to easily target multiple instance across your app.

    Method Parameters Description
    isActive target: string | string[] Indicates if the targeted instance(s) is blocking.
    start target: string | string[], message?: any Starts blocking for a single instance or multiple instances by passing instance name(s).
    stop target: string | string[] Stops blocking for a single instance or multiple instances by passing instance name(s).
    reset target: string | string[] Resets blocking for a single instance or multiple instances by passing instance name(s).
    unsubscribe target: string | string[] Unsubscribes a single instance or multiple instances by passing instance name(s).

    Other Modules

    Http Module - Automatically block during http requests

    Router Module - Prevent route changes while blocking

    Guides

    Upgrading to 2.0.0

    SystemJS Config

    Examples

    BlockUI Component - Stackblitz

    BlockUI Component Default Message - Stackblitz

    BlockUI Directive - Stackblitz

    BlockUI Custom Spinner Styles - Stackblitz

    BlockUI Custom Template - Stackblitz

    Install

    npm i ng-if-block-ui

    DownloadsWeekly Downloads

    97

    Version

    1.0.2-5.1

    License

    MIT

    Unpacked Size

    855 kB

    Total Files

    113

    Last publish

    Collaborators

    • rohit.sindhu90