As per the HTML:
<input class="form-control m-input ng-pristine ng-valid ng-touched" name="contact" pattern="^((0091)|(\+91)|0?)[789]{1}\d{9}$" placeholder="Enter contact number" required="" type="text">
none of the attibutes caters to the value change within the HTML DOM on sending text to the <input> element.
Deep Dive
The change in the DOM Tree occurs incase the <input> element contains the following attributes and evenets:
- change event: The
change event is fired for <input>, <select>, and <textarea> elements when an alteration to the element's value is committed by the user. Unlike the <input> event, the change event is not necessarily fired for each alteration to an element's value. Examples:
example#a:
<input type="text" class="form-control" (input)="onSearchChange($event.target.value)">
example#b:
<input type="text" [ngModel]="mymodel" (ngModelChange)="valuechange($event)" />
example#c:
<input type="text" [ngModel]="mymodel" (keypress)="mymodel=$event.target.value"/>
example#d:
<textarea [(ngModel)]="smsMessage" (change)="changeSMSMessage()"></textarea>
Note: The HTML specification lists the <input> types that should fire the change event.
Example
As an example, for some elements, including <input type="text">, the change event doesn't fire until the control loses focus. On entering something into the field below, and then click somewhere else to trigger the event.
HTML:
<input placeholder="Enter some text" name="name"/>
<p id="log"></p>
JavaScript:
const input = document.querySelector('input');
const log = document.getElementById('log');
input.addEventListener('change', updateValue);
function updateValue(e) {
log.textContent = e.target.value;
}
References
You can find a couple of relevant detailed discussions in:
