Stacked Bar Chart with Chart.js
This is a simple example of using Chart.js to create a stacked bar chart (sometimes called a stacked column chart).
It allows you to create all types of bar, line, area, and other charts in HTML. It uses the canvas standard. While I do prefer using SVG when working with data visualization on the web, Chart.js is a popular option, so it’s worth checking out.
Starting with a basic :
In the body, we’ll need a element to bind to. This is where the chart will appear.
And we’ll pull in the Chart.js library.
We’ll first need a reference to the element we wrote earlier.
And we’ll instantiate a new chart on this element. The first argument is the bound element, and the second is a definition of our chart. The definition will have three properties: type, data, and options.
Notice we’ve told Chart.js that this will be a type chart.
In the property, we’ll define datasets and their labels. In my example, I have three datasets — all with the same label.
Each dataset will have a label, data array, and backgroundColor. In a stacked bar chart, each dataset will have only one point of data.
We’ve told Chart.js that we want a bar chart, we’ve told it about our data, the last step is to tell it that this is chart should be stacked. We do this in the property.
The end result is a stacked bar chart.
And here’s the complete code:
We can make creating charts on a web page easy with Chart.js.
In this article, we’ll look at how to create charts with Chart.js.
Stacked Bar Chart
We can create a stacked bar chart with Chart.js.
For example, we can write:
to create a stacked bar chart with 2 datasets.
We have the properties within the property to make them stacked.
Horizontal Bar Chart
We can create a horizontal bar chart by changing the type to .
For example, we can write:
We just changed the property and change the bars to display horizontally.
A radar chart is a way of showing multiple data points and variations between them.
To create one, we can write:
We have 3 datasets to display in the chart.
And we have labels for each dataset.
has the background color for each shape displayed
We should now see a triangle for the chart datasets.
Also, we can change many other options like border color, border dash, borer width, point radius, point border color, point style, and more.
Line styles like background color, border color, border dash, fill, point hover radius, etc. can also be changed.
We can change the scaling with the property.
For example, we can write:
to change the scale of the radar chart. The changes the intervals of the lines in the chart.
makes the angle line display if it’s .
We can create stacked bar charts and radial charts with Chart.js.
# Bar Chart
A bar chart provides a way of showing data values represented as vertical bars. It is sometimes used to show trend data, and the comparison of multiple data sets side by side.
# Dataset Properties
- - options for this dataset only
- - options for all bar datasets
- - options for all bar elements
- - options for the whole chart
The bar chart allows a number of properties to be specified for each dataset. These are used to set display properties for a specific dataset. For example, the color of the bars is generally set this way. Only the option needs to be specified in the dataset namespace.
All these values, if , fallback to the scopes described in option resolution
# Example dataset configuration
|Base value for the bar in data units along the value axis. If not set, defaults to the value axis base value.|
|How to clip relative to chartArea. Positive value allows overflow, negative value clips that many pixels inside chartArea. = clip at chartArea. Clipping can also be configured per side:|
|Should the bars be grouped on index axis. When , all the datasets at same index value will be placed next to each other centering on that index value. When , each bar is placed on its actual index-axis value.|
|The base axis of the dataset. for vertical bars and for horizontal bars.|
|The label for the dataset which appears in the legend and tooltips.|
|The drawing order of dataset. Also affects order for stacking, tooltip and legend. more|
|If , null or undefined values will not be used for spacing calculations when determining bar size.|
|The ID of the group to which this dataset belongs to (when stacked, each group will be a separate stack). more|
|The ID of the x-axis to plot this dataset on.|
|The ID of the y-axis to plot this dataset on.|
The style of each bar can be controlled with the following properties:
|The bar background color.|
|The bar border color.|
|The edge to skip when drawing bar.|
|The bar border width (in pixels).|
|The bar border radius (in pixels).|
|Set this to ensure that bars have a minimum length in pixels.|
|Style of the point for legend. more...|
All these values, if , fallback to the associated options.
This setting is used to avoid drawing the bar stroke at the base of the fill, or disable the border radius. In general, this does not need to be changed except when creating chart types that derive from a bar chart.
For negative bars in a vertical chart, and are flipped. Same goes for and in a horizontal chart.
- (only valid on stacked bars: the borders between bars are skipped)
If this value is a number, it is applied to all sides of the rectangle (left, top, right, bottom), except . If this value is an object, the property defines the left border width. Similarly, the , , and properties can also be specified. Omitted borders and are skipped.
If this value is a number, it is applied to all corners of the rectangle (topLeft, topRight, bottomLeft, bottomRight), except corners touching the . If this value is an object, the property defines the top-left corners border radius. Similarly, the , , and properties can also be specified. Omitted corners and those touching the are skipped. For example if the border is skipped, the border radius for the corners and will be skipped as well.
When the border radius is supplied as a number and the chart is stacked, the radius will only be applied to the bars that are at the edges of the stack or where the bar is floating. The object syntax can be used to override this behavior.
The interaction with each bar can be controlled with the following properties:
|The bar background color when hovered.|
|The bar border color when hovered.|
|The bar border width when hovered (in pixels).|
|The bar border radius when hovered (in pixels).|
All these values, if , fallback to the associated options.
Percent (0-1) of the available width each bar should be within the category width. 1.0 will take the whole category width and put the bars right next to each other. more...
Percent (0-1) of the available width each category should be within the sample width. more...
If this value is a number, it is applied to the width of each bar, in pixels. When this is enforced, and are ignored.
If set to , the base sample widths are calculated automatically based on the previous and following samples so that they take the full available widths without overlap. Then, bars are sized using and . There is no gap when the percentage options are 1. This mode generates bars with different widths when data are not evenly spaced.
If not set (default), the base sample widths are calculated using the smallest interval that prevents bar overlapping, and bars are sized using and . This mode always generates bars equally sized.
Set this to ensure that bars are not sized thicker than this.
# Scale Configuration
The bar chart sets unique default values for the following configuration from the associated options:
|If true, extra space is added to both edges and the axis is scaled to fit into the chart area.|
|If true, the bars for a particular data point fall between the grid lines. The grid line will move to the left by one half of the tick interval. If false, the grid line will go right down the middle of the bars. more...|
# Example scale configuration
# Offset Grid Lines
If true, the bars for a particular data point fall between the grid lines. The grid line will move to the left by one half of the tick interval, which is the space between the grid lines. If false, the grid line will go right down the middle of the bars. This is set to true for a category scale in a bar chart while false for other scales or chart types by default.
# Default Options
It is common to want to apply a configuration setting to all created bar charts. The global bar chart settings are stored in . Changing the global options only affects charts created after the change. Existing charts are not changed.
# barPercentage vs categoryPercentage
The following shows the relationship between the bar percentage option and the category percentage option.
# Data Structure
All of the supported data structures can be used with bar charts.
# Stacked Bar Chart
Bar charts can be configured into stacked bar charts by changing the settings on the X and Y axes to enable stacking. Stacked bar charts can be used to show how one data series is made up of a number of smaller pieces.
# Horizontal Bar Chart
A horizontal bar chart is a variation on a vertical bar chart. It is sometimes used to show trend data, and the comparison of multiple data sets side by side. To achieve this you will have to set the property in the options object to . The default for this property is and thus will show vertical bars.
# Horizontal Bar Chart config Options
The configuration options for the horizontal bar chart are the same as for the bar chart. However, any options specified on the x-axis in a bar chart, are applied to the y-axis in a horizontal bar chart.
# Internal data format
where is an optional object defining stacked bar properties: . and are the input values. Those two are repeated in (closer to origin), (further from origin), and .
Last Updated:8/18/2021, 12:12:37 PM
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Bar chartjs example stacked
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