本頁說明如何在一個網頁上繪製多個圖表。
在單一頁面上繪製多個圖表
如果您想要在單一網頁中繪製多個圖表,請在網頁的 <head>
中加入下列程式碼:
- 透過單一呼叫
google.charts.load()
載入圖表所需的所有套件。 - 針對網頁上的每個圖表,新增呼叫
google.charts.setOnLoadCallback()
的回呼,並將圖表繪製成輸入內容,例如google.charts.setOnLoadCallback(myPieChart)
。
舉例來說,假設您想繪製兩張圓餅圖,顯示好友莎拉和安東尼在昨晚吃了多少披薩。以下範例顯示並排顯示這兩種圖表的方法。
<html> <head> <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script> <script type="text/javascript"> // Load Charts and the corechart package. google.charts.load('current', {'packages':['corechart']}); // Draw the pie chart for Sarah's pizza when Charts is loaded. google.charts.setOnLoadCallback(drawSarahChart); // Draw the pie chart for the Anthony's pizza when Charts is loaded. google.charts.setOnLoadCallback(drawAnthonyChart); // Callback that draws the pie chart for Sarah's pizza. function drawSarahChart() { // Create the data table for Sarah's pizza. var data = new google.visualization.DataTable(); data.addColumn('string', 'Topping'); data.addColumn('number', 'Slices'); data.addRows([ ['Mushrooms', 1], ['Onions', 1], ['Olives', 2], ['Zucchini', 2], ['Pepperoni', 1] ]); // Set options for Sarah's pie chart. var options = {title:'How Much Pizza Sarah Ate Last Night', width:400, height:300}; // Instantiate and draw the chart for Sarah's pizza. var chart = new google.visualization.PieChart(document.getElementById('Sarah_chart_div')); chart.draw(data, options); } // Callback that draws the pie chart for Anthony's pizza. function drawAnthonyChart() { // Create the data table for Anthony's pizza. var data = new google.visualization.DataTable(); data.addColumn('string', 'Topping'); data.addColumn('number', 'Slices'); data.addRows([ ['Mushrooms', 2], ['Onions', 2], ['Olives', 2], ['Zucchini', 0], ['Pepperoni', 3] ]); // Set options for Anthony's pie chart. var options = {title:'How Much Pizza Anthony Ate Last Night', width:400, height:300}; // Instantiate and draw the chart for Anthony's pizza. var chart = new google.visualization.PieChart(document.getElementById('Anthony_chart_div')); chart.draw(data, options); } </script> </head> <body> <!--Table and divs that hold the pie charts--> <table class="columns"> <tr> <td><div id="Sarah_chart_div" style="border: 1px solid #ccc"></div></td> <td><div id="Anthony_chart_div" style="border: 1px solid #ccc"></div></td> </tr> </table> </body> </html>
使用單一回呼繪製多個圖表
以上範例使用兩個回呼繪製圖表,因為兩個圖表的資料不同。如要針對相同資料繪製多個圖表,使用這兩種圖表編寫單一回呼可能更為方便。以下範例會說明這一點。
<html> <head> <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script> <script type="text/javascript"> // Load Charts and the corechart and barchart packages. google.charts.load('current', {'packages':['corechart']}); // Draw the pie chart and bar chart when Charts is loaded. google.charts.setOnLoadCallback(drawChart); function drawChart() { var data = new google.visualization.DataTable(); data.addColumn('string', 'Topping'); data.addColumn('number', 'Slices'); data.addRows([ ['Mushrooms', 3], ['Onions', 1], ['Olives', 1], ['Zucchini', 1], ['Pepperoni', 2] ]); var piechart_options = {title:'Pie Chart: How Much Pizza I Ate Last Night', width:400, height:300}; var piechart = new google.visualization.PieChart(document.getElementById('piechart_div')); piechart.draw(data, piechart_options); var barchart_options = {title:'Barchart: How Much Pizza I Ate Last Night', width:400, height:300, legend: 'none'}; var barchart = new google.visualization.BarChart(document.getElementById('barchart_div')); barchart.draw(data, barchart_options); } </script> </head> <body> <!--Table and divs that hold the pie charts--> <table class="columns"> <tr> <td><div id="piechart_div" style="border: 1px solid #ccc"></div></td> <td><div id="barchart_div" style="border: 1px solid #ccc"></div></td> </tr> </table> </body> </html>