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Editorial Team
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Asked: 2026-05-12T18:42:55+00:00

I’m actually coding a case where a child popup window transfer data to parent

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I’m actually coding a case where a child popup window transfer data to parent window as:

var childArrayData = new Array();
childArrayData[0] = 'Data text1';
childArrayData[1] = 'Data text2';
childArrayData[2] = 'Data text3';
window.opener.parentVariable = childArrayData;

I got an error which was solved like:

var childArrayData = new window.opener.Array();     <-----
childArrayData[0] = 'Data text1';
childArrayData[1] = 'Data text2';
childArrayData[2] = 'Data text3';
window.opener.parentVariable = childArrayData;

Why is Array class different between two different windows? Does it relate to namespacing? May you refer to any article about the answer?

Thanks in advance.

Best,

Esteve

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1 Answer

  1. Editorial Team

    It’s a known issue. Read this post on comp.lang.javascript written by Douglas Crockford.

    When you say Array, you are talking
    about window.Array. window is the
    browser’s context object, and you get
    one per page (or frame). All of the
    arrays created within a context will
    have their constructor property set to
    window.Array.

    An array created in a different
    context has a different window.Array,
    so your test

    myArray instanceof Array

    fails. The ECMAScript standard does
    not discuss multiple contexts, even
    though virtually all implementations
    support them. The ECMAScript standard
    also fails to provide a reliable
    technique for testing the type of
    arrays. The obvious thing would have
    been

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