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Lets you use data layer pushes with no 'event' for a GTM Trigger.
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| <script> | |
| /** | |
| * Data layer pushes should always have an event (even in simple <head> snippets). | |
| * But if you're dealing with an event-less push upon which you need to be able | |
| * to fire a Trigger, and you cannot change the push snippet, this code will | |
| * let you detect the push and add an event dynamically. | |
| * | |
| * Tested in Chrome, Firefox, and IE9. | |
| */ | |
| (function(){ | |
| var dataLayer = window.dataLayer, origPushFn = dataLayer.push; | |
| dataLayer.push = function(){ | |
| var i, obj, args = [].slice.call(arguments,0); | |
| try{ | |
| for( i=0; i<args.length; i++ ){ | |
| if( !( obj=args[i] ) || obj.event ) continue; | |
| // v v v CUSTOM CODE HERE v v v | |
| /* | |
| At this point, `obj` is data that was pushed without an 'event' value. | |
| Test `obj` for conditions of the push on which you want base a Trigger, | |
| and set `obj.event`. | |
| EXAMPLE: | |
| if( obj.userId ){ | |
| obj.event = 'provideUserId'; | |
| } | |
| */ | |
| // ^ ^ ^ CUSTOM CODE HERE ^ ^ ^ | |
| } | |
| }catch(ex){} | |
| return origPushFn.apply( dataLayer, args ); | |
| }; | |
| })() | |
| </script> |
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