Re: [visualization-api] Chartwrapper, Map, infowindows and tooltips

['Simon Banton' via Google Visualization API]

Further to this, I have eliminated the "req id" error in Chrome by 
replacing the jsapi autoload:

        <script type="text/javascript" src=
'https://www.google.com/jsapi?autoload={
            "modules":[{
                "name":"visualization",
                "version":"1"
            }]
        }'></script>
        
        <script type="text/javascript">
            google.charts.load("current", {packages:["map"]});
            google.setOnLoadCallback(drawVisualization);
            var wrap;

with the following:

<script type="text/javascript" src="https://www.google.com/jsapi";></script>
        
        <script type="text/javascript">
            google.load("visualization", "1");
            google.charts.load("current", {packages:["map"]});
            google.setOnLoadCallback(drawVisualization);
            var wrap;



However, this now causes the intermittent occurrence of the error : "You 
called the draw() method with the wrong type of data rather than a 
DataTable or DataView".

This seems to be entirely down to network response time - reloading (or 
shift reloading) will result in the map appearing rather than the error. 
This is completely reproducible.

Here is a link to the page using the new code that doesn't trigger the 
Chrome console warning about missing req id but instead has the 
intermittent new error:

http://web.org.uk/tmp/barrowmap/v13.html

>From this I surmise that the Chrome "req id" error is related to the 
autoload mechanism for jsapi

So I have swapped one error (req id) for a different, intermittent, one 
(wrong type of data). Is there a way to correct this new error?

If there is, perhaps we can return to my original query :-)

Regards
Simon

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