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Home/ Questions/Q 8085011
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Editorial Team
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Editorial Team
Asked: June 5, 20262026-06-05T17:58:36+00:00 2026-06-05T17:58:36+00:00

This code: if(typeof(Listings.page_num) != ‘undefined’) { // something } Triggers this notice in firebug

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This code:

if(typeof(Listings.page_num) != 'undefined') {
   // something
}

Triggers this notice in firebug console:

Listings is not defined http://mysite.com/js/content_ads.js Line 13

Well duh, that’s why I checked! Is there any way to get rid of this notice?

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  1. Editorial Team
    Editorial Team
    2026-06-05T17:58:39+00:00Added an answer on June 5, 2026 at 5:58 pm

    Do this.

    var Listings = Listings || {};
    if (typeof Listings.page_num !== "undefined") // page_num isset
    
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