Unable to trigger dispatchEvent on an input element for the Tab key in Angular 5

In my pursuit of a solution to move from one input to another on the press of the Enter key, I came across various posts suggesting custom directives. However, I prefer a solution that works without having to implement a directive on every component.

My attempt to use dispatchEvent with the key Tab did not yield the desired outcome. It seemed like it should have been straightforward. I am hopeful that someone can help me identify what went wrong with this stackblitz example.

<input (keyup)="handleChange($event)">

 public handleChange(e: KeyboardEvent)
 {
    if (e && e.keyCode === 13)
    {
      // Dispatching keyboard events for Tab key
      e.srcElement.dispatchEvent(new KeyboardEvent('keydown', { key: '9' }));
      e.srcElement.dispatchEvent(new KeyboardEvent('keypress', { key: '9' }));
      e.srcElement.dispatchEvent(new KeyboardEvent('keyup', { key: '9' }));

      // Other attempts at dispatching Tab key events

      console.log("Should move. Event was dispatched on", e.target, e.srcElement);
    }
 }

Answer №1

While this response may be three years late, it could still offer valuable insights to help save others hours of unnecessary searching...

The Solution Won't Yield Results

It appears that achieving focus using dispatchEvent is not a viable option. The simulated use of the Tab key does not produce the same result as a user physically pressing it, therefore failing to change the focus as intended.

What Should I Do Instead?

One potential workaround is to create a function that locates the next (or previous) tabbable element and triggers the focus() method on it. It's important to note that "tabbable" elements differ from those that are simply "focusable". Elements with tabindex="-1" can be programmatically focused using focus(), but aren't accessible via keyboard tabbing by the user. You can learn more about this distinction here.

Alternatively, you might consider utilizing an existing solution such as Joel Purra's EmulateTab. Though it is built in jQuery, the underlying principle remains consistent: locate the appropriate element and invoke focus() for achieving focus.

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