Google chart tooltips - google-visualization

I am using google spreadsheet to feed to my Column chart. To get the single columns to be a different color I used sort of a hack by setting values to 0 on opposite columns in the spreadsheet for each column in the chart. This gave me the the difference in color I needed for each column in the chart. The issue I am now having is the tooltips do not work for each column and was wondering how I can implement to work correctly in my code.
google.load('visualization', '1', {packages: ['corechart']});
</script>
<script type="text/javascript">
var visualization;
function drawVisualization() {
var query = new google.visualization.Query(
'http://spreadsheets.google.com/tq?key=0AjlSK7_zXoNHdDhrU2xiaHVIQmR1WldYZm1yMTNkM3c&pub=1');
// Apply query language statement.
// Send the query with a callback function.
query.send(handleQueryResponse);
}
function handleQueryResponse(response) {
if (response.isError()) {
alert('Error in query: ' + response.getMessage() + ' ' + response.getDetailedMessage());
return;
}
var data = response.getDataTable();
// set the 3rd column to the "tooltip" role
data.setColumnProperty(3, 'role', 'tooltip');
visualization = new google.visualization.ColumnChart(document.getElementById('visualization'));
visualization.draw(data, {legend: 'none', colors:['blue','red'],is3D:'True', isStacked:'true'});
}
google.setOnLoadCallback(drawVisualization);

Option A:
Adjust your underlying data so that you have 4 columns instead of 3, with the same values in column 2 (after the first set of data) as you have in your current column 3 (with the tooltip). Use the setColumnProperty() on the new columns 2 and 4 as tooltip.
Option B:
Copy your tooltip column 3 in Javascript to Column 2 (after the first data set) using insertColumn(), this should have the same effect as Option A. You will have to loop through to copy over the values, or otherwise add the same data via javascript.

Related

passing a tuple in a Google charts table using Django

Good afternoon everyone,
I am implementing Google Charts API in my Django project. I would like to draw two different charts, a pie chart and a table chart. I am able to display the Pie chart without problems. However, I am having trouble with the table chart. I am passing a tuple to the data.setCell() method. When I do that the table chart does not render.
Hereunder is the code that I wrote:
function drawTable() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Company Name');
data.addColumn('number', '52 week high');
data.addColumn('number', '52 week low');
data.addRows(5);
{% for company in data_cell|safe %}
data.setCell(company);
{% endfor %}
// data.setCell(0, 0, 'John');
var table = new google.visualization.Table(document.getElementById('table_div'));
table.draw(data, {showRowNumber: true, width: '50%', height: '50%'});
google.visualization.events.addListener(table, 'select', function() {
var row = table.getSelection()[0].row;
alert('You selected ' + data.getValue(row, 0));
});
}
data_cell is a variable that contains a list of tuples and it is part of the context dictionary in my views.py file. As follows you can find an example; ('Facebook', 384.33, 244.61)
I have tried looping through the list of tuples without the safe method and it does not work.
Any hints?
instead of using setCell, try the addRow method...
data.addRow(company);
setCell requires three arguments --> row index, column index, and value.
you cannot pass all in one variable.

Google Column chart customizing legend

I would like to customize my column chart API as below
1) When I click on the legend the data set associated with it should return null and show the legend in a disabled color. My code is below.
function drawVisualization() {
// Create and populate the data table.
var chart_div = document.getElementById('visualization2');
var data2 = google.visualization.arrayToDataTable([["Sections","Client Scored",{ role: "style" },"Client Confidence",{ role: "style" },"Average Mark",{ role: "style" },"Average Confidence",{ role: "style" }],["Set 1",90,"opacity: 1",95,"opacity: 0.5",78,"opacity: 1",69,"opacity: 0.5"],["Set 2",65,"opacity: 1",73,"opacity: 0.5",99,"opacity: 1",99,"opacity: 0.5"]]);
var options = {
title:"Understanding",
width:'100%', height:600,seriesType: "bars"
,series:{1: {type: "line",pointSize: 10,lineWidth :0},3: {type: "line",pointSize: 10,lineWidth :0}}
,colors: ['#fafe14','#fafe14','#05afed','#05afed']
,vAxis: {title: "%Score",format: '##', minValue: '1', maxValue: '8'},
hAxis: {title: "",slantedText: true,slantedTextAngle:60, maxTextLines: 5, maxAlternation: 10 },
chartArea: {height: '60%',top:10}
};
var chart = new google.visualization.ColumnChart(chart_div);
chart.draw(data2, options);
}
for this, I tried the hideColumns feature and it worked but the problem is that legend also fades out with the dataset and if I remove second column third column will become second and 4 will become 3 and 5 will become 4.
2) My second question is column 1 and column 3 are lines with line width zero as shown below.
Is there any way to move this to the exact middle of the first bar as shown below
If I'm understanding the first part of your question correctly you're trying to hide a column without removing it from your DataTable.
To have a column in a DataTable not display in a chart drawn from it you can change the column's role to something that doesn't display on the chart.
For example, the annotationText role for a column applies to the annotation column that comes before it, but if there isn't an annotation column before it then the annotationText column will simply be ignored.
So if you want to hide column 2, the following code snippet would do so:
data_table.setColumnProperty(2,'role','annotationText');
And if you want to show the column again you would just change the role back to data
data_table.setColumnProperty(2,'role','data');

Google Visualization - Select Events w/ Dashboard

I am creating a dashboard with Google Viz and am having trouble with the select event when the data is filtered. It works fine when the page loads and nothing is filtered. However, after filtering the data, it does not select the correct row from the dataTable on 'select' events. Here is my jsfiddle and my listener:
http://jsfiddle.net/5E7zX/1/
google.visualization.events.addListener(rBubbleChart, 'select', function() {
var selection = rBubbleChart.getChart().getSelection();
var item = selection[0];
var school = data.getValue(item.row, 1);
alert('school is: ' + school);
});
When it is unfiltered, the alert box displays the school that was selected. However, when it is filtered on a school, the alert box does not display the correct school (the exception is Air Base Elem because that is the first school in the list).
Any thoughts on how to get the correct row of data once the data is filtered? Thanks.
The selection indices refer to the data as seen by the chart, which is not necessarily the same as your base DataTable, so you need to check against the data used by the chart by calling the getDataTable method to fetch the chart's data, and then referencing that when getting a value:
google.visualization.events.addListener(rBubbleChart, 'select', function() {
var selection = rBubbleChart.getChart().getSelection();
// get the data used by the chart
var dt = rBubbleChart.getDataTable();
// test selection array length, since it can be zero when a user deselects a point!
if (selection.length) {
var item = selection[0];
var school = dt.getValue(item.row, 1);
alert('school is: ' + school);
}
});

options to create google charts Line Chart with annotations

Here is my data:
dataToDisplay=[[156,"2013-12-01","note one"],
[206,"2013-12-02","note two"],
[280,"2013-12-03","note three"],
[320,"2013-12-04","note four"],
[0,"2013-12-05",""]]
Here is the code to make a line chart:
chartData = new google.visualization.DataTable();
chartData.addColumn('number', 'Miles');
chartData.addColumn('string', 'Date');
chartData.addColumn({type:'string', role:'annotationText'});
chartData.addRows(dataToDisplay);
graphTitle = 'Mileage'
var options = {
title: graphTitle,
height:600
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(chartData, options);
and the error:
"Data column(s) for axis #0 cannot be of type string"
I'm at a loss as to what's going on. Which column is axis #0?
Also, is there a way to build a line graph with annotations using something like:
var chartData = google.visualization.arrayToDataTable(dataArray);
If so, how would dataArray have to be constructed?
LineChart's accept strings only as annotation columns or domain columns. The first column is the domain column, and annotation columns have to be specified as such. In your case, the "date" column is causing the problem, as it is the second column, and therefore is expected to be either a data ("number" type) column or an annotation column. You did not specify it as an annotation column, which is why you get the error.
Is your intent to have the dates be annotations or values? if they are intended to be values, you must put them in the first column:
chartData = new google.visualization.DataTable();
chartData.addColumn('string', 'Date');
chartData.addColumn('number', 'Miles');
chartData.addColumn({type:'string', role:'annotation'});
In order to use the "annotationText" data role, the preceeding column must be an "annotation" role column. The "annotation" role creates a text label on the chart at the associated data point, and the "annotationText" role creates a tooltip to show when the user hovers over the label.

Easy way to see if DataView is empty?

Using the Google visualization api, is there an easy way to see if a DataView is empty?
https://developers.google.com/chart/interactive/docs/reference#DataView
I can see perhaps using dataView.getValue(0, 1) etc to check for nulls, but it also contains column headings.
I'm guessing it's tricky as the dataview could have many different formats, but is there a good generic way of checking for empty data views? I'm using the dataview for a pie chart.
If I remember right, this can be easily done this way
var predata = response.getDataTable();
var vals = new Array();
var rownum = predata.getNumberOfRows();
// Make sure our data isn't empty.
if (null==predata) // yoda was here
return;
Returns the data table as returned by the data source. Returns null if
the query execution failed and no data was returned.
From reading the documentation, it seems like dataView.getNumberOfRows() is what you're looking for. Before calling that, however, you need to get the filtered rows which are null and then hide them. Here is an example using the Google Code Playground where I am checking one column for null and then hiding the row if it is null. Replace Google Code's default JavaScript for that example with what's below:
function drawVisualization() {
var dataTable = google.visualization.arrayToDataTable([
['Name', 'Age', 'Instrument', 'Color'],
[null, null, null, null],
['Paul', 52, 'Sitar', 'Red'],
['George', 16, 'Guitar', 'Green'],
['Ringo', 72, 'Drums', 'White']
]);
var table = new google.visualization.Table(document.getElementById('table'));
table.draw(dataTable, null);
var dataView = new google.visualization.DataView(dataTable);
// Get rows where the 2nd column contains null
var filteredRows = dataView.getFilteredRows([{column: 1, value:null}]);
console.log(filteredRows);
dataView.setColumns([0, 1]);
// Hide the filtered rows returned
dataView.hideRows(filteredRows);
// Check the number of rows that now exist
console.log(dataView.getNumberOfRows());
var chart = new google.visualization.ColumnChart(document.getElementById('chart'));
chart.draw(dataView, {width: 400, height: 200});
}
getDistinctValues may help you with that. It works fine for line charts, when applied to columns which are visualized along Y-axis.
It doesn't seem quite right...
Perhaps I should replace null with 0 on the server-side before the client side even sees the data....
I've resorted to:
if (dataView.getValue(0, 1) === null || dataView.getValue(1, 1) === null || dataView.getValue(2, 1)) === null)
Where my dataview strucuture is:
Column Title 1 | Data
Column Title 2 | Data
Column Title 3 | Data