File Size Pipe in Angular

This post will teach us how to recognize an event in an Angular application when a user clicks outside of a component.

Required conditions

Basic familiarity with Visual Studio Code, Angular 2 or higher, Node and NPM installed, and Bootstrap

Make an Angular Project
The command to create an Angular project is as follows.

Create an Angular Project

Create an Angular project by using the following command.

Now install Bootstrap by using the following command,

Now open the styles.css file and add Bootstrap file reference. To add a reference in the styles.css file add this line.

Now open actionmenu.component.html file and add the following code.

<span class="token tag"><span class="token punctuation">&lt;</span>div <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>sidebar {{show}} panel-group<span class="token punctuation">"</span></span> <span class="token attr-name">clickOutside</span> <span class="token attr-name">(clickOutside)</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>works()<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token punctuation">&lt;</span>div <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span> panel panel-default<span class="token punctuation">"</span></span> <span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token punctuation">&lt;</span>div<span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token punctuation">&lt;</span>div <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>panel-body<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>Panel Body<span class="token tag"><span class="token punctuation">&lt;/</span>div<span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token punctuation">&lt;</span>div <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>panel-footer<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>Panel Footer<span class="token tag"><span class="token punctuation">&lt;/</span>div<span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token punctuation">&lt;/</span>div<span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token punctuation">&lt;/</span>div<span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token punctuation">&lt;/</span>div<span class="token punctuation">&gt;</span></span>

<div>

<div class="panel-body">Panel Body</div>

<div class="panel-footer">Panel Footer</div>

</div>

Now open actionmenu.component.ts file and add the following code.

<span class="token keyword module keyword-import">import</span> <span class="token imports"><span class="token punctuation">{</span> <span class="token maybe-class-name">Component</span><span class="token punctuation">,</span> <span class="token maybe-class-name">Input</span> <span class="token punctuation">}</span></span> <span class="token keyword module keyword-from">from</span> <span class="token string">'@angular/core'</span><span class="token punctuation">;</span>

@<span class="token function"><span class="token maybe-class-name">Component</span></span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token literal-property property">selector</span><span class="token operator">:</span> <span class="token string">'app-actionmenu'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">templateUrl</span><span class="token operator">:</span> <span class="token string">'./actionmenu.component.html'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">styleUrls</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'./actionmenu.component.css'</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token keyword module keyword-export">export</span> <span class="token keyword keyword-class">class</span> <span class="token class-name">ActionmenuComponent</span> <span class="token punctuation">{</span>
  @<span class="token function"><span class="token maybe-class-name">Input</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span> show<span class="token operator">:</span> boolean<span class="token operator">=</span><span class="token boolean">true</span><span class="token punctuation">;</span>

  <span class="token function">works</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword keyword-this">this</span><span class="token punctuation">.</span><span class="token property-access">show</span> <span class="token operator">=</span> <span class="token operator">!</span><span class="token keyword keyword-this">this</span><span class="token punctuation">.</span><span class="token property-access">show</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

import { Component, Input } from '@angular/core';

@Component({

selector: 'app-actionmenu',

templateUrl: './actionmenu.component.html',

styleUrls: ['./actionmenu.component.css']

})

export class ActionmenuComponent {

@Input() show: boolean=true;

works() {

this.show = !this.show;

}

Now open actionmenu.component.css file and add the following code.

Now open app.component.html file and add the following code.

<span class="token operator">&lt;</span>div <span class="token keyword keyword-class">class</span><span class="token operator">=</span><span class="token string">"container"</span> style<span class="token operator">=</span><span class="token string">"margin-top:10px;margin-bottom: 24px;"</span><span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span>div <span class="token keyword keyword-class">class</span><span class="token operator">=</span><span class="token string">"col-sm-12 btn btn-info"</span><span class="token operator">&gt;</span>
    <span class="token maybe-class-name">How</span> to detect clicks outside <span class="token keyword keyword-in">in</span> <span class="token maybe-class-name">Angular</span>  <span class="token maybe-class-name">Application</span>
  <span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span>div <span class="token keyword keyword-class">class</span><span class="token operator">=</span><span class="token string">"container"</span><span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span>button type<span class="token operator">=</span><span class="token string">"button"</span> <span class="token keyword keyword-class">class</span><span class="token operator">=</span><span class="token string">"btn btn-success"</span> <span class="token punctuation">(</span>click<span class="token punctuation">)</span><span class="token operator">=</span><span class="token string">"show = !show"</span><span class="token operator">&gt;</span><span class="token maybe-class-name">Primary</span><span class="token operator">&lt;</span><span class="token operator">/</span>button<span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span>app<span class="token operator">-</span>actionmenu <span class="token punctuation">[</span>show<span class="token punctuation">]</span><span class="token operator">=</span><span class="token string">"show"</span><span class="token operator">&gt;</span><span class="token operator">&lt;</span><span class="token operator">/</span>app<span class="token operator">-</span>actionmenu<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>

How to detect clicks outside in Angular Application

</div>

<button type="button" class="btn btn-success" (click)="show = !show">Primary</button>

<app-actionmenu [show]="show"></app-actionmenu>

</div>

Now open app.component.ts file and add the following code.

<span class="token keyword module keyword-import">import</span> <span class="token imports"><span class="token punctuation">{</span> <span class="token maybe-class-name">Component</span> <span class="token punctuation">}</span></span> <span class="token keyword module keyword-from">from</span> <span class="token string">'@angular/core'</span><span class="token punctuation">;</span>

@<span class="token function"><span class="token maybe-class-name">Component</span></span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token literal-property property">selector</span><span class="token operator">:</span> <span class="token string">'app-root'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">templateUrl</span><span class="token operator">:</span> <span class="token string">'./app.component.html'</span><span class="token punctuation">,</span>
  <span class="token literal-property property">styleUrls</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'./app.component.css'</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token keyword module keyword-export">export</span> <span class="token keyword keyword-class">class</span> <span class="token class-name">AppComponent</span> <span class="token punctuation">{</span>
  title <span class="token operator">=</span> <span class="token string">'Angular App'</span><span class="token punctuation">;</span>
  <span class="token literal-property property">show</span><span class="token operator">:</span>boolean<span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

import { Component } from '@angular/core';

@Component({

selector: 'app-root',

templateUrl: './app.component.html',

styleUrls: ['./app.component.css']

})

export class AppComponent {

title = 'Angular App';

show:boolean= false;

}

Now create a new directive by using the following command, and the following code in this directive.

Now open app.module.ts and following code.

Now run the application using npm start and check the result.

This article teaches us how to build a custom file size pipe that transforms a file’s bytes into a format that can be read by humans.

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