从现有的Google图表DataTable对象创建pivoted DataView [英] Creating pivoted DataView from existing google charts DataTable object
本文介绍了从现有的Google图表DataTable对象创建pivoted DataView的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个DataTable包含:
id,day,proj,col1,col2 ,子类型,时间
1,11月28日,项目A,1050,880,foo,17481
2,11月28日,项目A,1050,880,酒吧,16098 $ b $ 3,11月28日,projectA ,1080,40,foo,13509
4,11月28日,projectA,1080,40,bar,9031
但是想创建一个包含以下内容的新的数据视图:
$ b
id,day ,项目A,1050,880,17481,16098
3,11月28日,项目A,1080,40,13509,9031
然后我想创建一个堆叠的ColumnChart for。
在查询语言中有一个pivot子句,但是如何转换DataTable中的数据? 。
您可以在这个例子上看到jsfiddle被asgallant。它使用dataView来完成任务。
google.load('visualization','1',{packages:['表']});
google.setOnLoadCallback(drawChart);
函数drawChart(){
var data = new google.visualization.DataTable();
data.addColumn('number','A');
data.addColumn('string','B');
data.addColumn('number','C');
data.addRows([
[1,'foo',6],
[2,'foo',2],
[3,'foo',1] ,
[4,'foo',3],
[1,'bar',7],
[2,'bar',3],
[ 'baz',8],
[2,'baz',4]
]);
var table1 = new google.visualization.Table(document.getElementById('table1'));
table1.draw(data,{});
*手动调整数据表
*设置列A作为视图中的第一列
*然后我们必须将C值分离到它们自己的列
*根据B的值,使用带有计算列的DataView
* /
var view = new google.visualization.DataView(data);
view.setColumns([0,{
type:'number',
label:'foo',
calc:function(dt,row){
/ /只返回C的值,其中B =foo
return(dt.getValue(row,1)=='foo')?dt.getValue(row,2):null;
} {
type:'number',
label:'bar',
calc:function(dt,row){
//返回值C仅适用于B =bar的行
return(dt.getValue(row,1)=='bar')?dt.getValue(row,2):null;
}
},{
类型:'数字',
标签:'baz',
calc:函数(dt,row){
//仅返回C值对于B =baz
返回的行(dt.getValue(row,1)=='baz')?dt.getValue(row,2):null;
}
}]);
//接下来,我们对列A上的视图进行分组,从而获得旋转数据
var pivotedData = google.visualization.data.group(view,[0],[{
列:1,
类型:'数字',
标签:view.getColumnLabel(1),
聚合:google.visualization.data.sum
},{
列:2,
类型:'数字',
标签:view.getColumnLabel(2),
聚合:google.visualization.data.sum
}, {
列:3,
类型:'数字',
标签:view.getColumnLabel(3),
聚合:google.visualization.data.sum
} ]);
var table2 = new google.visualization.Table(document.getElementById('table2'));
table2.draw(pivotedData,{});
}
或者,您可以手动完成。
var data = new google.visualization.DataTable();
data.addColumn('string','First Column Title');
var baseline = chartData.getValue(chartData.getNumberOfRows() - 1,15); (var i = 0; i< chartData.getNumberOfRows(); i ++){
data.addColumn('number',chartData.getFormattedValue(i,0));
}; (var j = 0; j< chartData.getNumberOfColumns() - 2; j ++){
data.addRow();
data.setValue(j,0,chartData.getColumnLabel(j + 1)); (i,j + 1);
for(var i = 0; i< chartData.getNumberOfRows(); i ++){
data.setValue(j,i + 1,chartData.getValue(i,j + 1));
};
};
I have a DataTable that contains:
id,day,proj,col1,col2,subtype,time
1,Nov 28,projectA,1050,880,foo,17481
2,Nov 28,projectA,1050,880,bar,16098
3,Nov 28,projectA,1080,40,foo,13509
4,Nov 28,projectA,1080,40,bar,9031
But would like to create a new pivoted DataView containing:
id,day,proj,col1,col2,foo,bar
1,Nov 28,projectA,1050,880,17481,16098
3,Nov 28,projectA,1080,40,13509,9031
Which I'd then like to create a stacked columnChart for.
There's a pivot clause in the query language, but how do I pivot data that's already in a DataTable?
解决方案
Manually.
You can see this example on jsfiddle by asgallant. This uses a dataView to accomplish the task.
google.load('visualization', '1', {packages: ['table']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('number', 'A');
data.addColumn('string', 'B');
data.addColumn('number', 'C');
data.addRows([
[1, 'foo', 6],
[2, 'foo', 2],
[3, 'foo', 1],
[4, 'foo', 3],
[1, 'bar', 7],
[2, 'bar', 3],
[1, 'baz', 8],
[2, 'baz', 4]
]);
var table1 = new google.visualization.Table(document.getElementById('table1'));
table1.draw(data, {});
/* manually pivot the data table
* set column A as the first column in the view,
* then we have to separate out the C values into their own columns
* according to the value of B, using a DataView with calculated columns
*/
var view = new google.visualization.DataView(data);
view.setColumns([0, {
type: 'number',
label: 'foo',
calc: function (dt, row) {
// return values of C only for the rows where B = "foo"
return (dt.getValue(row, 1) == 'foo') ? dt.getValue(row, 2) : null;
}
}, {
type: 'number',
label: 'bar',
calc: function (dt, row) {
// return values of C only for the rows where B = "bar"
return (dt.getValue(row, 1) == 'bar') ? dt.getValue(row, 2) : null;
}
}, {
type: 'number',
label: 'baz',
calc: function (dt, row) {
// return values of C only for the rows where B = "baz"
return (dt.getValue(row, 1) == 'baz') ? dt.getValue(row, 2) : null;
}
}]);
// next, we group the view on column A, which gets us the pivoted data
var pivotedData = google.visualization.data.group(view, [0], [{
column: 1,
type: 'number',
label: view.getColumnLabel(1),
aggregation: google.visualization.data.sum
}, {
column: 2,
type: 'number',
label: view.getColumnLabel(2),
aggregation: google.visualization.data.sum
}, {
column: 3,
type: 'number',
label: view.getColumnLabel(3),
aggregation: google.visualization.data.sum
}]);
var table2 = new google.visualization.Table(document.getElementById('table2'));
table2.draw(pivotedData, {});
}
Alternatively, you can do it the manual way.
var data = new google.visualization.DataTable();
data.addColumn('string', 'First Column Title');
var baseline = chartData.getValue(chartData.getNumberOfRows() - 1, 15);
for (var i = 0; i < chartData.getNumberOfRows(); i++) {
data.addColumn('number', chartData.getFormattedValue(i, 0));
};
for (var j = 0; j < chartData.getNumberOfColumns() - 2; j++) {
data.addRow();
data.setValue(j, 0, chartData.getColumnLabel(j + 1));
for (var i = 0; i < chartData.getNumberOfRows(); i++) {
data.setValue(j, i + 1, chartData.getValue(i, j+1));
};
};
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