Your onchange event handler for the <select> element does not process the
selected value correctly. Remove the "onchange" event handler from the
<select> element, and change the name parameter to id:
<select id="users">
Then, in your javascript, add a callback from the google loader that sets
up the event handler:
function init () {
$('#users').change(function () {
var val = $(this).find(':selected').val();
drawChart(val);
});
}
google.load('visualization', '1', {'packages':['corechart', 'table'],
callback: init});
This ensures that the Visualization API is loaded and ready to use before
you can attempt to draw a chart.
On Tuesday, May 27, 2014 11:59:25 AM UTC-4, Guillaume DIGOIN wrote:
>
> I want to do something like what you will find attached.[image: Images
> intégrées 1][image: Images intégrées 2][image: Images intégrées 3]
> Step 1 : select your countries
> Step 2 : Push the select bottom
> Step 3 : Show different kind of google graphs with data refers to the
> country you ticked.
>
> For that, i found that website :
> http://sophiedogg.com/creating-a-google-pie-chart-using-sql-data/ (and
> here
> https://developers.google.com/chart/interactive/docs/php_example?hl=fr)
> where the person did exactly what i want to do but with a pie chart. I
> would like to do it with other kind of charts.
> Let's take an example of what i want to do:
>
> the user select canada and the US. then push the send button. on the same
> page i want to be able to show google graphs with preselected factors i
> want to put in. For example, i want to show the GDP of those two countries
> on a graph like this one
> https://google-developers.appspot.com/chart/interactive/docs/gallery/linechart
> over
> 10 years.
> Then a second graphs which would take the 10 best values of a table and
> show it.
> For that, i built a database like this:[image: Images intégrées 4]
>
> where "facteurs" are my factors (GDP for instance)
> Nom is the name of the factor
> Pays is the name of the countries
> Valeur is the value and annee is the year.
>
> I'm currently trying to do the pie chart with my data, just to see if it
> works. You can check my php files. The next step would be to implement this
> on a wordpress page.
>
> I don't know why it's not working.
>
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