Js that would fill a textbox with info after a button click?

Let's say there are three buttons and one big text box.

If I click the first button, some certain info is copied in the text box etc. Is that possible?

 

2 simple methods:

- document.form_name.name_of_inutbox.value = 'info';
- document.getElementById('id_of_inputbox').value = 'info';

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Thank you.

 

What do you think about this?

Let's say from your example, I replace the 'info' with a php variable that is for example
$lala = "info";

it works that way, but if it contains line breaks, it doesn't:

$lala = "info
more info";

why is that?