[visualization-api] it does not show chart but if you create it

[Daniel Mendez]

Hi I am tryning, display a pie chart by call ajax. The call ajax works, 
when I inspect page I see the div with many somethings, namely, It is not 
empty. 

<script type="text/javascript" 
src="https://www.gstatic.com/charts/loader.js";></script>
google.charts.load('current', {'packages': ['corechart', 'bar', 'table'], 
'language': 'es', callback: function(){
            $("#formDiarioango").submit(drawChart);
        }            
    });



 function drawChart(event) {
        event.preventDefault();
               
        // viene la petición ajax
        $.ajax({
             url: $(this).attr('action'),
             type: 'post',
             data: $(this).serialize(),
             dataType: "json",
             success: function(rta){
                                                   
                // material en el mes
                var data = google.visualization.arrayToDataTable([
                    ['Material', 'cantidad'],
                    ['Organico', rta.tipoMateriales["organico"]],
                    ['Reciclable', rta.tipoMateriales["reciclable"]],
                    ['No aprovechable', 
rta.tipoMateriales["noAprovechable"]]
                ]);

                var options = {
                    title: 'Tipo de materiales recolectados (Kg) en el mes'
                };
                var chart = new 
google.visualization.PieChart(document.getElementById('tipo_material_mes'));
                chart.draw(data, options);  
             }
        });
}

The div is empty  before of call with ajax, it has content later of the 
call, but does not show anything apart from the title of the graph and 
inspecting the code has something inside [as seen in the attached image]. 



Alguna idea, sugerencia para resolver mi problema estaré muy agradecido. Lo 
siento por mi inglés 

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