Gmap problem

[paleman]

Hello I have been reading the documentation about gmap in primefaces, I put according the documentation:

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<script src="https://maps.googleapis.com/maps/api/js? key=YOUR_API_KEY&callback=initMap" async defer></script>

I replace YOUR_API_KEY by my google api key and remove the space between ? and key

and

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<p:gmap center="41.381542, 2.122893" zoom="15" type="hybrid" style="width:600px;height:400px" />

but when I rendered the page there was an error: The reference to entity "callback" must end with the ';' delimiter.
So I search on google I replace & by & the line was

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<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&amp;callback=initMap" async defer></script>

then I have the error Attribute name "async" associated with an element type "script" must be followed by the ' = ' character.

reading on google I replace

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<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&amp;callback=initMap" async="async" defer></script>

then I have the error Attribute name "defer" associated with an element type "script" must be followed by the ' = ' character.

reading on google I replace

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<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&amp;callback=initMap" async="async" defer="defer" ></script>

then I have this errors:
ReferenceError: google is not defined
uncaught exception: InvalidValueError: initMap is not a function

What I am doing wrong?

[kukeltje]

Where in the documentation did you read this? And what version of the documentation? And what version are you using?