Google GPT - googletag.cmd queue re-order - google-dfp

Question

Could somebody help me with the Google GPT googletag.cmd queue re-order issue?
(1) in the home HTML page, I have this:
googletag.cmd.push(function() { defineSlot1(); });
googletag.cmd.push(function() { defineSlot2(); });
googletag.cmd.push(function() { defineSlot3(); });
googletag.cmd.push(function() { defineSlot4(); });
(2) in attached js, I dynamically added:
googletag.cmd.push(function() { defineSlot5(); });
(3) So right now in the googletag.cmd queue, the sequence like this:
[slot1, slot2, slot3, slot4, slot5];
My question is, how to move the slot5 to the second place after slot1, like this:
[slot1, slot5, slot2, slot3, slot4];
In https://developers.google.com/doubleclick-gpt/reference,
googletag.commandArray only has push(f) method, and the googletag.cmd is not a standard array.
How to do this? Thanks.

Answer 1

Google GPT library is loaded in async mode and it initially defines googletag.cmd as a regular Array.
<script type='text/javascript'>
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
(function() {
var gads = document.createElement('script');
gads.async = true;
gads.type = 'text/javascript';
var useSSL = 'https:' == document.location.protocol;
gads.src = (useSSL ? 'https:' : 'http:') +
'//www.googletagservices.com/tag/js/gpt.js';
var node = document.getElementsByTagName('script')[0];
node.parentNode.insertBefore(gads, node);
})();
</script>
When the main library gets downloaded (it occurs in parallel with page rendering) it converts the initially defined array into a custom object (https://developers.google.com/doubleclick-gpt/reference#googletag.CommandArray) so you indeed won’t be able to modify it.
Back to your question:
If you use
googletag.pubads().enableSingleRequest() (https://developers.google.com/doubleclick-gpt/reference#googletag.PubAdsService_enableSingleRequest) all of your adslots will be queried and displayed on the first googletag.display(…) call.
If you don’t use enableSingleRequest an individual query will be sent each time you call googletag.display(…) for a particular ad slot regardless of its definition order
Considering p.1 and p.2 I don’t get why would you care the order of slots definition.
Anyway, if you really need it you might define your own queue variable
window.custom_cmd = [];
and use it instead of googletag.cmd throughout your page so it would look as follows:
custom_cmd.push(function() {
// regular defineSlot(…) calls
});
and then somewhere after your attached js file is loaded just
// reorder it or whatever else
…
// copy your queue into the regular queue
for (var i = 0; i < custom_cmd.length; i++) {
googletag.cmd.push(custom_cmd[i]);
}
this code would trigger the ad calls