How Can I Preserve `this` Binding with jQuery's `$(this)` Inside ES6 Arrow Functions?

Preserving Lexical This Binding with jQuery $(this) in ES6 Arrow Functions

When working with jQuery click bindings, developers may encounter an issue when attempting to use ES6 arrow functions with lexical this binding. This is because arrow functions in ES6 lexically bind this, which can lead to unexpected behavior when using jQuery, which expects a closure with a different this value.

In the example provided:

this._pads.on('click', () => {
  if (this.go) { $(this).addClass('active'); }
});

The arrow function is lexically binding this, causing $(this) to refer to the Game object rather than the clicked element. To resolve this issue, it is necessary to use event.currentTarget instead of $(this):

this._pads.on('click', (event) => {
  if (this.go) { $(event.currentTarget).addClass('active'); }
});

This ensures that $(this) correctly references the clicked element, as jQuery explicitly provides event.currentTarget to handle scenarios where the this value may not be consistent.

Understanding Lexical Binding in ES6

ES6 arrow functions have lexical this binding, meaning they inherit the this value of their surrounding context. This can be both advantageous and challenging, as it can prevent accidental binding issues but also requires careful consideration when working with callbacks.

Conclusion

When using ES6 arrow functions with jQuery click bindings, it is important to be mindful of the lexical this binding and consider using event.currentTarget to explicitly access the clicked element. This ensures correct functionality and prevents unexpected behavior due to varying this values.

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