Google Script - Sidebar button keeps opening a new tab

Question

I\'m creating an extremely basic script to assist me in one of my google spreadsheets.

I\'ve successfully got a sidebar showing, with a few buttons (which function).

Answer 1

When I saw your issue, I thought that this is due to <form>. So I proposed the following modifications.

1. Modify <form> to <form onsubmit="event.preventDefault()">.

2. Modify <base target="_top"> to <base target="_self">.

3. Remove <base target="_top">.

Note:

• I think that @TheMaster's answer is more useful information.

References:

• Event.preventDefault()
• The Document Base URL element

Answer 2

Issue:

• <button> type, if not specified defaults to type=submit. So, The form automatically submits the data to the server. This is not preferable in a iframe.

Solution:

• Explicitly specify button type as button. <button type='button'>
• Use event.preventDefault() to prevent automatic form submission.

References:

• Button#Default
• Sample Form