Imagine a scenario where, as soon as you enter your credit card number, the form automatically undergoes a change without requiring a button click, similar to how a credit card logo pops up. The form detects changes instantly after the input field has been filled.
An illustration of a basic concept:
Using Angularjs
$scope.changeStyle=function(){
$scope.color="red";
} <form>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" ng-model="someName" ng-change="changeStyle()" id="exampleInputEmail1" ng-style="{'color':color}"
placeholder="Email">
</div>
<button type="submit" class="btn btn-default">Submit</button>
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