我试图创建复合图表与给定的数据,即,[日期,值1,值],但我不能处理这样的输入:处理在谷歌图表空数据
// [["Day","Dose","INR"],["17/04",1.5,null]]
// [["Day","Dose","INR"]]
// [["Day","Dose","INR"],["17/04",1.5,null],["18/04",2.5,null]]
即,当有一组具有特定值的数据全部由空值组成时,我无法在图上绘制它。这样的输入是好的:
// [["Day","Dose","INR"],["17/04",1.5,null],["18/04",2.5,0.9]]
// [["Day","Dose","INR"],["17/04",1.5,null],["18/04",2.5,0.9],["19/04",null,1.4]]
这里是我的JavaScript代码绘制图。数据来自Ruby模型。
$(function() {
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawVisualization);
function drawVisualization() {
// Some raw data (not necessarily accurate)
var data = google.visualization.arrayToDataTable(<%= DrugInr.generate_array(@patient) %>);
var options = {
vAxes: { 1: {title: 'Dose', format: '#.#', maxValue: 20},
0: {title: 'INR',format: '#.#', minValue: -1, baselineColor:"#CCCCCC"} },
hAxis: {title: 'Day'},
seriesType: 'bars',
bar: {
groupWidth: 2
},
series: {
0:{ type: "bars", targetAxisIndex: 1 },
1:{ type: 'line', targetAxisIndex: 0}
}
};
var chart = new google.visualization.ComboChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
});
如何处理这些半空值?