JavaScript Reference
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Quick Reference

The Window opener property returns a reference to the window that created the window.

<!-- html element to place output -->
<p id="my_output"></p>

<button onclick="my_function()">Click Here</button>

The following function is called when the above button is clicked by the user.

It opens a new window, and then the new window writes back to the “opener” window “Hello world”.

// function
function my_function() {
    let my_window = window.open('', '', 'width=500,height=500');
    my_window.opener.document.getElementById('my_output').innerHTML = 'Hello World';
}

Output

Hello World

Syntax

window.opener

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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