TrainSignManage/WebFrame/bower_components/chart.js/docs/02-Bar-Chart.md

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---
title: Bar Chart
anchor: bar-chart
---

### Introduction
A bar chart is a way of showing data as bars.

It is sometimes used to show trend data, and the comparison of multiple data sets side by side.

<div class="canvas-holder">
	<canvas width="250" height="125"></canvas>
</div>

### Example usage
```javascript
var myBarChart = new Chart(ctx).Bar(data, options);
```

### Data structure

```javascript
var data = {
	labels: ["January", "February", "March", "April", "May", "June", "July"],
	datasets: [
		{
			label: "My First dataset",
			fillColor: "rgba(220,220,220,0.5)",
			strokeColor: "rgba(220,220,220,0.8)",
			highlightFill: "rgba(220,220,220,0.75)",
			highlightStroke: "rgba(220,220,220,1)",
			data: [65, 59, 80, 81, 56, 55, 40]
		},
		{
			label: "My Second dataset",
			fillColor: "rgba(151,187,205,0.5)",
			strokeColor: "rgba(151,187,205,0.8)",
			highlightFill: "rgba(151,187,205,0.75)",
			highlightStroke: "rgba(151,187,205,1)",
			data: [28, 48, 40, 19, 86, 27, 90]
		}
	]
};
```
The bar chart has the a very similar data structure to the line chart, and has an array of datasets, each with colours and an array of data. Again, colours are in CSS format.
We have an array of labels too for display. In the example, we are showing the same data as the previous line chart example.

The label key on each dataset is optional, and can be used when generating a scale for the chart.

### Chart Options

These are the customisation options specific to Bar charts. These options are merged with the [global chart configuration options](#getting-started-global-chart-configuration), and form the options of the chart.

```javascript
{
	//Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
	scaleBeginAtZero : true,

	//Boolean - Whether grid lines are shown across the chart
	scaleShowGridLines : true,