JavaScript to move text from one box to another

[Daniel28747008qxn5]

Hi. I have limited knowledge with JavaScript but I am trying to find something or a way to do the following:

I want to have a text box that is read only that users can add more and more text to without deleting or overwriting what is already there. The way they add text into the box is via a second box where they can type into and press a button to send it to the read only box. Once the text sends to the read only box, the input box is then empty again, ready to type in more text again. 

In summary box 1 can be written in and by pressing a button it sends to box 2. Box 1 is then clear ready to be written in again. Box 2 keeps all the text that is being input into it as a record of all the entries. 

can anyone help with how to do this in a PDF?

thanks in advance

[Nesa Nurani]

You can try this as 'On Blur' action of 'Box 1' field:

this.getField("Box 2").value += event.target.value + "\n";
event.target.value = "";

It will trigger on mouse click outside of field or on tab, or did you mean to send text with click on actual button field?