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Angular's  <ng-template>  element defines a template that is not rendered by default.   Description : With  <ng-template> , you can define template content that is only being rendered by Angular when you, whether directly or indirectly, specifically instruct it to do so, allowing you to have full control over how and when the content is displayed. Note that if you wrap content inside an  <ng-template>  without instructing Angular to render it, such content will not appear on a page. For example, see the following HTML code, when handling it Angular won't render the middle "Hip!" in the phrase "Hip! Hip! Hooray!" because of the surrounding  <ng-template> . <p> Hip! </p> <ng-template>   <p> Hip! </p> </ng-template> <p> Hooray! </p>   You must utilise ng-template combined with structural derivatives like ngIf , ngFor , and ngSwitch in order to render the items inside the template.

The keyup event occurs when the user releases a key (on the keyboard). (keyup)  is an Angular event binding to respond to any DOM event. It is a synchronous event that is triggered as the user is interacting with the text-based input controls.  When a user  presses and releases a key, the (keyup) event occurs.  For using in text-based input controls it is generally used to get values after every keystroke. [app.component.html] <div   class = "content" >    <p> Entered values :  {{ this.values }} </p>    <p> KeyCode :  {{ this.keycode }} </p>    <p> Key :  {{ this.key }} </p>    <input   id = "textbox"   #TB   placeholder = "Enter any key"   (keyup) = "onKey($event)"   /> </div>   [app.component.ts] export   class   AppComponent  {    values  =  '' ;    keycode  =  '' ;    key  =  '' ;    onKey ( event :  any

 You can dynamically render elements or content or components using ngIf in angular.   What is ngIf in Angular? The ngIf Directive in Angular10 is used to remove or recreate a portion of an HTML element based on an expression. If the expression inside it is false then the element is removed and if it is true then the element is added to the DOM.   In the following example, a button component is used to dynamically render an input textbox and a paragraph tag.   Example : https://stackblitz.com/edit/angular-ivy-vuls2v?file=src%2Fapp%2Fapp.component.html,src%2Fapp%2Fapp.component.ts,src%2Fapp%2Fapp.component.css [app.component.html] <div   class = "button" >    <button   (click) = "NgIf()" > What is NgIf inangular </button>    <button   (click) = "TextBox()" > Show TextBox </button> </div> <div   class = "content_div" >    <div   *ngIf = "condition" &g

  Angular Change Event : The (change) is a DOM event fires when changes to the form fields like <input> , <select> , and <textarea> are committed by the user.   Video  tutorial  :   https://youtu.be/qou1SDN_m2Y  This Event Fires When : ·        user changes the input & moves the focus away from the text box (blur event) ·        On <select> it fires when the user selects a new option either by a mouse click or using a keyboard. ·         Fires when the state of a check box or radio button change due to users action   Change Event Example : The following example shows how to use the change event in Angular. [app.component.html] <label> Enter a Text  </label> <input   class = "textInput"   type = "text"   (change) = "changeHandler($event)"   />   [app.component.ts] export   class   AppComponent  {    changeHandler ( args ) {      console . log ( ar

Learn how to add and remove a class name to an element with angular   We can able to add and remove a class to an element in angular. In the following example, we have added/removed a class for the input element using a button component.   Example :   Video  tutorial :   https://youtu.be/vMM05geNQJ4   [app.component.html] <input   class = "myInput"   type = "text"   value = "subscribe for more videos"   /> <br   /> <button   (click) = "addClass()"   class = "button" > Add Class </button> <button   (click) = "romveClass()"   class = "button" > Remove Class </button>   [app.component.css] .myInput  {    font-weight :  bold ; } .inputStyle  {    width :  300px ;    color :  coral ;    border-radius :  5px ;    height :  25px ;    padding :  3px ; } .button  {    color :  aliceblue ;    backgrou