Adding the submit Handler

The next step is for FormHandler to listen for the submit event on the <form> element and run a callback when it occurs.

To make the FormHandler module more reusable, you will not hardcode the submit handler code. You will instead write a method that accepts a function argument, adds the submit listener, and then calls the function argument inside that listener.

First, add a prototype method called addSubmitHandler to formhandler.js.

...
    if (this.$formElement.length === 0) {
      throw new Error('Could not find element with selector: ' + selector);
    }
  }

  FormHandler.prototype.addSubmitHandler = function () {
    console.log('Setting submit handler for form');
    // More code will go here
  }; App.FormHandler = FormHandler; ...

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