Question

I have this javascript code, from google charts api right in the bottom of my view :

<div id='visualization'></div>
...
<script type="text/javascript">
function drawVisualization() {
        // Create and populate the data table.

        var data = google.visualization.arrayToDataTable(<%=raw @pie_gender %>)

        // Create and draw the visualization.
        new google.visualization.PieChart(document.getElementById('visualization')).
            draw(data, {title:"Men and Women"});
      }
      google.setOnLoadCallback(drawVisualization);
</script>

I’ve tried to put this js code in my assets folder under a .js file, and include it in my headers, as well as replacing <%=raw @pie_gender %> with this.getAttribute('data-message') and putting my div as ‘, but then i get a javascript error "getAttribute" does not exist for object window

I have also tried to pass my array as an input argument like : onload="drawVisualization(<%=raw @pie_gender %>), but then I get “Error: Not an array”

What might I be doing wrong ?

EDIT

@pie_gender = [[‘Gender’, ‘Occurences’][‘M’, 10][‘F’, 5]]

Based on example from google

EDIT 2
If i print the json output

<% logger.debug "Pie Gender : #{@pie_gender.to_json}" %>
        <div id="visualization" onload="drawVisualization(<%= @pie_gender.to_json %>)" > </div>

,it seems just fine :

Pie Gender : [["Gender","Receipts"],["",25000],["F",8658]]

but it seems that something happens while sending this as an argument to my js function, because it still says that message is not an array :

function drawVisualization(message) {
        // Create and populate the data table.
        var data = google.visualization.arrayToDataTable(message);

        // Create and draw the visualization.
        new google.visualization.PieChart(document.getElementById('visualization')).
            draw(data, {title:"Men and Women"});
      }
      google.setOnLoadCallback(drawVisualization);

Answer 1

To workaround this, I inserted my javascript code in a partial

_googlescript.html.erb

<script type="text/javascript">
function drawVisualization() {
        // Create and populate the data table.

        var data = google.visualization.arrayToDataTable(<%=raw data_array %>)

        // Create and draw the visualization.
        new google.visualization.PieChart(document.getElementById('visualization')).
            draw(data, {title:"Men and Women"});
      }
      google.setOnLoadCallback(drawVisualization);
</script>

in my view I rendered the partial in the bottom of the page, and removed the onload, which just seemed not to be doing a thing… :

<div id="visualization" > </div>
...
<%= render partial: 'shared/googlescript', locals: {data_array:@pie_gender} %>

Now i can see the chart again…but i still feel there is a better answer to my question.