Using console.log as an event listener

Question

Using console.log as an event listener

Check out this fiddle for reference: http://jsfiddle.net/calvintennant/jBh3A/

I am interested in utilizing console.log as an event listener:

badButton.addEventListener('click', console.log);

However, the fiddle demonstrates that this approach will trigger an error.

I am aware of the workaround to resolve the error (by enclosing console.log in another function). My query is regarding the reason behind this error. Could there be a security measure preventing the usage of native functions in this manner?

javascript

Answer 1

Answer №1

The reason for this behavior is that within the log function, the value of this refers to the console (implementation may vary). If you directly pass it as an event handler, this will refer to the widget, as demonstrated below:

goodButton.addEventListener('click', function(e) { console.log(this);});

Another approach to avoid creating a separate function is to use console.log.bind(console), although this method may not be compatible with Internet Explorer 8:

goodButton.addEventListener('click', console.log.bind(console));

Answer 2

The reason for this behavior is that within the log function, the value of this refers to the console (implementation may vary). If you directly pass it as an event handler, this will refer to the widget, as demonstrated below:

goodButton.addEventListener('click', function(e) { console.log(this);});

Another approach to avoid creating a separate function is to use console.log.bind(console), although this method may not be compatible with Internet Explorer 8:

goodButton.addEventListener('click', console.log.bind(console));

Using console.log as an event listener

Answer №1

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