Monday, 2 March 2015

Dealing with events with Google Charts / Tables

Here are the web references I have used for this articles

  • https://developers.google.com/chart/interactive/docs/gallery
  • https://developers.google.com/chart/interactive/docs/events
  • https://developers.google.com/chart/interactive/docs/basic_interactivity
  • https://google-developers.appspot.com/chart/interactive/docs/gallery/table


Let's take the previous example, with pie chart (adding  'pieHole': 0.5 option to get a like-donut pie chart) ; if you would like to add a listener to catch the click event, you will have to add the following code in 'orange' :

<html>
    <head>
 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
        <script type="text/javascript" src="http://www.google.com/jsapi"></script>

        <script type='text/javascript'>

            //https://google-developers.appspot.com/chart/interactive/docs/quick_start
            //https://google-developers.appspot.com/chart/interactive/docs/gallery/table
            //https://developers.google.com/chart/interactive/docs/gallery
         
            function drawChart() {
                var json = $.ajax({
                    url: "http://localhost/angularjs/get_repartition_order_status_todaygoogle_pie.php?type=graph",
                    dataType:"json",
                    async: false
                }).responseText;
                jsondata = eval(json);
                // Create the data table.
                var data = new google.visualization.DataTable();
                data.addColumn('string', 'Topping');
                data.addColumn('number', 'Slices');
                data.addRows(jsondata);

                // Set chart options
                var options = {'title':'Order Status for today ',
                    'width':500, 'pieHole': 0.5,
                    'height':400};
                //var options = {'title':'Order Status for today ','width':600, 'pieHole': 0.5,'height':600, 'is3D': true};
                // Instantiate and draw our chart, passing in some options.
                var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
                chart.draw(data, options);
           
                google.visualization.events.addListener(chart, 'select', selectHandler);

                // Notice that e is not used or needed.
                function selectHandler(e) {
                    var selectedItem = chart.getSelection()[0];
                    if (selectedItem) {
                        var value = data.getValue(selectedItem.row, 0);
                        alert('The user selected ' + value);
                    };
                }
            }
     
            // Set a callback to run when the Google Visualization API is loaded.
            google.setOnLoadCallback(drawChart);
            // Load the Visualization API and the piechart package.
            google.load('visualization', '1.0', {'packages':['corechart']});
        </script>
    </head>

    <body>
        <!--Div that will hold the pie chart-->
        <div id="chart_div"></div>
        <div id="table_div"></div>
    </body>
</html>


Now, I would like to trigger a draw of an associated table according to the selected value:

<html>
    <head>
        <!--Load the AJAX API-->
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
        <script type="text/javascript" src="http://www.google.com/jsapi"></script>

        <script type='text/javascript'>
         
            function drawChart() {
                var json = $.ajax({
                    url: "http://localhost/angularjs/get_repartition_order_status_todaygoogle_pie.php?type=graph",
                    dataType:"json",
                    async: false
                }).responseText;
                jsondata = eval(json);
                // Create the data table.
                var data = new google.visualization.DataTable();
                data.addColumn('string', 'Topping');
                data.addColumn('number', 'Slices');
                data.addRows(jsondata);

                // Set chart options
                var options = {'title':'Order Status for today ',
                    'width':500, 'pieHole': 0.5,
                    'height':400,'margin' : 0};
                //var options = {'title':'Order Status for today ','width':600, 'pieHole': 0.5,'height':600, 'is3D': true};
                // Instantiate and draw our chart, passing in some options.
                var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
                chart.draw(data, options);
                // orgChart is my global orgchart chart variable.
                google.visualization.events.addListener(chart, 'select', selectHandler);

                // Notice that e is not used or needed.
                function selectHandler(e) {
                    var selectedItem = chart.getSelection()[0];
                    if (selectedItem) {
                        var value = data.getValue(selectedItem.row, 0);
                        // alert('The user selected ' + value);
                        google.setOnLoadCallback(drawTable(value));
                    };
                }
            }
            function drawTable(etat) {
                var json = $.ajax({
                    url: "http://localhost/angularjs/get_repartition_order_status_todaygoogle_pie.php?type=table&status=" + etat,
                    dataType:"json",
                    async: false
                }).responseText;
                JSONObject = eval(json);  
                var new_json = "[";
                for (var key in JSONObject) {
                    if (JSONObject.hasOwnProperty(key)) {
                        new_json += "['" + JSONObject[key]["order_id"] + "'";
                        new_json += ",'" + JSONObject[key]["store_id"] + "'";
                        new_json += ",'" + JSONObject[key]["purchase_serial_number"] + "'";
                        new_json += ",'" + JSONObject[key]["purchase_creation_date"]  + "'";
                        new_json += ",'" + JSONObject[key]["lastmod"]  + "'";
                        new_json += ",'" + JSONObject[key]["status"]  + "'],";
                    }
                }
                //console.log(new_json.length);
                new_json=new_json.substring(0,new_json.length - 1)
                new_json += "]";
                //console.log(eval(new_json));
                var options = {'showRowNumber': true};
                
                var data = new google.visualization.DataTable();
                data.addColumn('string', 'order_id');
                data.addColumn('string', 'store_id');
                data.addColumn('string', 'PSN');
                data.addColumn('string', 'Creation Date');
                data.addColumn('string', 'Modif. Date');
                data.addColumn('string', 'Status');

                data.addRows(eval(new_json));

                var table = new google.visualization.Table(document.getElementById('table_div'));
                
                table.draw(data, options);
            }
            // Set a callback to run when the Google Visualization API is loaded.
            google.setOnLoadCallback(drawChart);
            // Load the Visualization API and the piechart package.
            google.load('visualization', '1.0', {'packages':['corechart','table']});
        </script>
    </head>

    <body>
        <!--Div that will hold the pie chart-->
        <div id="chart_div"></div>
        <div id="table_div"></div>
    </body>
</html>


The result is the following one :