What kind of Input field is being provided as an argument to a TypeScript function?

Currently, I am working through an Angular 2 tutorial where an input element is being passed to a function through a click event.

The tutorial includes an addTodo function with the following signature: addTodo(event, todoText){ }. However, there is a warning stating that Parameter 'todoText' has an implicit 'any' type.

I am contemplating if there exists a TypeScript object that can be used instead of any specifically meant to represent a form input control.

Example Angular 2 HTML

<div class="add-todo-form text-center">
  <h1>Add ToDo</h1>
  <div class="form-group">
    <input class="form-control input-lg" placeholder="Add Todo.." autofocus #todoText>
    <br>
    <button (click)="addTodo($event, todoText)" class="btn btn-primary btn-block">Create</button>
  </div>
</div>

Example Typescript

addTodo(event: any, todoText: any){
  console.log('xxxxxxxxxxx');
  var result: any;

  var newTodo = {
    text: todoText,
    isCompleted: false
  };

  result = this._todoService.saveTodo(newTodo);

  result.subscribe( (x: any)=> {
    this.todos.push(newTodo);
    todoText.value = '';
  })
}

Answer №1

Thanks to the informative response from @Gunter, I was able to navigate my way through lib.es6.d.ts and discover the definition for HTMLInputElement, an extension of HTMLElement.

Answer №2

In the case that it is a component or directive, the specific instance of said component or directive will be provided; otherwise, an HTMLElement would be used.

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