Make three calls to display three charts

multi-chart-view.js

({
...
    renderChart: function () {
        if (!this.isChartReady()) {
            return;
        }

        d3.select(this.el).select('#example-chart1 svg')
            .datum(this.bluered)
            .transition().duration(500)
            .call(this.chart);
        d3.select(this.el).select('#example-chart2 svg')
            .datum(this.purpleteal)
            .transition().duration(500)
            .call(this.chart);
        d3.select(this.el).select('#example-chart3 svg')
            .datum(this.yellowgray)
            .transition().duration(500)
            .call(this.chart);
        
        this.chart_loaded = _.isFunction(this.chart.update);
    }
})