Hi Marc,
How the google.load() call behaves depends on *when* it is called. You can
call it within a function, but then it depends on *when* that function is
called. The key difference regarding *when* is whether the document is
still being loaded or the document has already finished loading. If the
document has finished loading, then you need to add a 'callback' property
to your google.load() call, like so:
google.load('visualization', '1', {'packages':['corechart'],
*'callback': drawChart*})
The reason is that, without the 'callback' property, google.load will
assume the document is still being loaded, and when it writes a script tag
out to load the visualization library, that will *replace* your already
loaded document rather than add to it.
On Thu, Apr 17, 2014 at 2:41 AM, Marc Locchi <[email protected]> wrote:
> I am using Google Charts for the first time. I have copied their basic
> example of pie chart into my page and have included Google jsapi in my
> header.
>
> I have added the following code to my page:
>
> <div id="mychartid"></div>
>
> <script type="text/javascript">
> // Load the Visualization API and the piechart package.
> google.load('visualization', '1', {'packages':['corechart']});
>
> // Set a callback to run when the Google Visualization API is loaded.
> google.setOnLoadCallback(drawChart);
>
> // Callback that creates and populates a data table,
> // instantiates the pie chart, passes in the data and
> // draws it.
> function drawChart() {
>
> // Create and populate the data table.
> var data = google.visualization.arrayToDataTable([
> ['Products', '# Products'],
> ['New', eval(sessionStorage.new_menu)],
> ['Current', eval(sessionStorage.cur_menu)],
> ['Retired', eval(sessionStorage.ret_menu)]
> ]);
>
> // Create and draw the visualization.
> new
> google.visualization.PieChart(document.getElementById('mychartid')).
> draw(data, {title:"Dishes Status Mix"});
> }</script>
>
> When i load the page it all works OK, chart shows. I then wrap the Google
> code in my own function and call it (loadHQCharts();) at the end of the
> main script.
>
> <script type="text/javascript"> function loadHQCharts() {
> // Load the Visualization API and the piechart package.
> google.load('visualization', '1', {'packages':['corechart']});
> .
> . }</script>
>
> The page loads and then it goes blank with an empty BODY and no errors in
> inspect/Firebug. I am using Wordpress if it helps. Any ideas welcome!
>
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--
Daniel LaLiberte <https://plus.google.com/100631381223468223275?prsrc=2> -
978-394-1058
[email protected] <[email protected]> 5CC, Cambridge MA
[email protected] <[email protected]> 9 Juniper Ridge
Road, Acton MA
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