以编程方式格式化Google图表

Question

使用以下代码如何设置格式,以便CurrencyValue1和CurrencyValue2在图表中以美元(作为货币值)显示？

function drawChart() {
    var data = new google.visualization.DataTable();
    data.addColumn('date', 'Date');
    data.addColumn('number', 'CurrencyValue1');
    data.addColumn('number', 'CurrencyValue2');

    data.addRows(1);
    data.setValue(0, 0, new Date(2011, 8, 12));
    data.setValue(0, 1, 300.0000);
    data.setValue(0, 2, 759.1707);

    var chart = new google.visualization.LineChart(document.getElementById('chart_div'));

    chart.draw(data, { width: 660, height: 470, title: 'Heading', is3D: true, backgroundColor: '#f5f3e5' });
}

Answer 1

请参阅文档:http://code.google.com/intl/cs-CZ/apis/chart/interactive/docs/reference.html#numberformatter

var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'CurrencyValue1');
data.addColumn('number', 'CurrencyValue2');

var formatter = new google.visualization.NumberFormat(
      {prefix: '$', negativeColor: 'red', negativeParens: true});
formatter.format(data, 1);
formatter.format(data, 2);

这将格式化第二列和第三列,如钱(前缀为美元符号,如"$ 15.00")