Displays tooltips when hovering over points.

How to create a line graph using ChartJS

You can smooth the lines by setting the curveType option to function :. The code to generate this chart is below. Note the use of the curveType: function option:. InGoogle announced guidelines intended to support a common look and feel across its properties and apps such as Android apps that run on Google platforms. We call this effort Material Design. We'll be providing "Material" versions of all our core charts; you're welcome to use them if you like how they look.

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You load the Google Visualization API although with the 'line' package instead of the 'corechart' packagedefine your datatable, and then create an object but of class google. Line instead of google. Note: Material Charts will not work in old versions of Internet Explorer. Material Line Charts have many small improvements over Classic Line Charts, including an improved color palette, rounded corners, clearer label formatting, tighter default spacing between series, softer gridlines, and titles and the addition of subtitles.

The Material Charts are in beta. The appearance and interactivity are largely final, but many of the options available in Classic Charts are not yet available in them. You can find a list of options that are not yet supported in this issue.

Drawing a Dotted Line

Also, the way options are declared is not finalized, so if you are using any of the classic options, you must convert them to material options by replacing this line: chart. Sometimes you'll want to display two series in a line chart, with two independent y-axes: a left axis for one series, and a right axis for another:.

DataTable ; data. Line chartDiv ; materialChart. LineChart chartDiv ; classicChart. Note that not only are our two y-axes labeled differently "Temps" versus "Daylight" but they each have their own independent scales and gridlines. If you want to customize this behavior, use the vAxis.

In the Material code below, the axes and series options together specify the dual-Y appearance of the chart. The series option specifies which axis to use for each 'Temps' and 'Daylight' ; they needn't have any relation to the column names in the datatable. The axes option then makes this chart a dual-Y chart, placing the 'Temps' axis on the left and the 'Daylight' axis on the right. In the Classic code, this differs slightly. Rather than the axes option, you will use the vAxes option or hAxes on horizontally oriented charts.

Also, instead of using names, you will use the index numbers to coordinate a series with an axis using the targetAxisIndex option. Note: Top-X axes are available only for Material charts i. If you want to put the X-axis labels and title on the top of your chart rather than the bottom, you can do that in Material charts with the axes. The google. For Material Line Charts, the google. Rows: Each row in the table represents a set of data points with the same x-axis location.

The duration of the animation, in milliseconds. For details, see the animation documentation.There are a number of options to allow styling an axis. There are settings to control grid lines and ticks.

The grid line configuration is nested under the scale configuration in the gridLines key. It defines options for the grid lines that run perpendicular to the axis. The tick configuration is nested under the scale configuration in the ticks key. It defines options for the tick marks that are generated by the axis.

The minorTick configuration is nested under the ticks configuration in the minor key. It defines options for the minor tick marks that are generated by the axis. Omitted options are inherited from ticks configuration.

The majorTick configuration is nested under the ticks configuration in the major key. It defines options for the major tick marks that are generated by the axis. These options are disabled by default. Styling There are a number of options to allow styling an axis. Grid Line Configuration The grid line configuration is nested under the scale configuration in the gridLines key. Name Type Default Description display boolean true If false, do not display grid lines for this axis.

If specified as an array, the first color applies to the first grid line, the second to the second grid line and so on. See MDN.

Line Charts in JavaScript

This is useful when there are multiple axes and you need to control which grid lines are drawn. This is set to true for a bar chart by default. Tick Configuration The tick configuration is nested under the scale configuration in the ticks key.

Name Type Default Description callback function Returns the string representation of the tick value as it should be displayed on the chart. See callback. Omitted options are inherited from options above. Useful when ticks are drawn on chart area.

Minor Tick Configuration The minorTick configuration is nested under the ticks configuration in the minor key. Major Tick Configuration The majorTick configuration is nested under the ticks configuration in the major key.

Name Type Default Description enabled boolean false If true, major tick options are used to show major ticks. No results matching " ". The color of the grid lines. Length and spacing of dashes on grid lines. Offset for line dashes. If true, draw lines on the chart area inside the axis lines. Length and spacing of dashes of the grid line for the first index index 0. Offset for line dashes of the grid line for the first index index 0. If true, grid lines will be shifted to be between labels.

Returns the string representation of the tick value as it should be displayed on the chart. Font style for the tick labels, follows CSS font-style options i.This tutorial shows how to create a chart with historical actual data and future projected data, with the historical data formatted with a solid line and the future data with dashed lines.

I have a population data for to and projected population data forand only. What I would like to do is a full line from to and a dotted line from to to to Is that possible? I made a simple chart of this data, using a chart type of Scatter with Straight Lines. Then I selected the first line segment for the projected data select one line segment by selecting the entire line with one click, and selecting the specific line segment with a second clickand I formatted it to have dashed lines.

So far, so good, except that legend went a bit funny. When individual points re formatted differently, and there is only one series in the chart, Excel helpfully changes the legend to show each individual point, taking up half the chart. No big deal, the legend is redundant anyway, so delete it. Then reformat the rest of the projected line segments.

Hard enough to select each itty bitty one, then your brain begins to turn into mush from the repetition. The better way to make the chart is to start with better data. Put the Actual data in one column and the Projected data into the next. Repeat the last Actual value in the Projected column.

Now plot the data. Above I simply jumped ahead to a scatter chart without explanation, but anyone who knows me knows I love to explain stuff. So the first part of the chart has data every year, and it looks okay, but then the projected data comes at irregular intervals 7, 5, and 10 years. Treating these years as labels, the widely spaced projections are still plotted one slot apart, so the orange projected line does not extend smoothly from the actual data. So use Scatter with Straight Lines as your chart type.

But there are reasons to avoid the smoothed lines. Here all you have to do is select the entire Projected series, and format it once, changing the color to blue and the line style to dashed. I removed the legend, adjusted the X axis scale, and added data labels on the last visible point of each series.

In case you missed them, here they are:. Posted: Wednesday, July 11th, under Formatting. Comments: 6. This chart is so simple and yet so powerful. At a glance, the user can immediately determine whether the projection is a reasonable extrapolation of history. I use this all the time. The real challenge is coming up with the projected values. When I am doing pure extrapolation of the historical data, I like to use linear regression with a logarithmic transformation.

Is there a way to do something similar with column charts? As progresses, every month one projected column would change to actual. I need a different formatting for the actual and different for the projected Using ChartJS 2. You can get the code of this tutorial from my GitHub repository. We will create a line chart for two teams namely, TeamA and TeamB and their score for 5 matches - match1, match2, Now inside the css folder create a default.

This will contain the default stylesheet. Inside the js folder create line. In this file we will be writing the code to create line graphs. Kindly ignore other files shown in the above image. They were created when I saved this project in my GitHub repository.

chart js dotted line

Copy the HTML structure from the index. Now in the head include the default. Inside the body create a div and give it a class chart-container. And inside this div create a canvas and give it an id line-chartcanvas. And lastly before closing of the body tag include the line.

Time to write some css that will style the line. Open default. In the above code we are targeting class. Feel free to define your own style. I will always encourage you to experiment with the code and try it yourself.

First we will get the canvas using its id line-chartcanvas by writing the following code. Now we will define options for the chart. For this we will create an options object variable and set its responsive, title and legend properties. To create title for the line graph we will set the following for the title data object.

You can check the ChartJS documentation and set some other properties as well. But for this tutorial we will stick to the above mentioned properties. Now its time to create a data variable that will hold the score of the two teams - TeamA and TeamB for the 5 matches. We create a variable chart and instantiate the Chart class. We pass ctx which holds the canvas and a data object. The data object contains the type property set to linedata property set to data variable and the options property set to options.

chart js dotted line

If we want to limit the minimum and maximum value for the y-axis then we can add the scales property to the options and set the yAxes property. In the following example we are setting the minimum value for the y-axis to and maximum value to 80 and we are also defining the stepSize of Click here for the complete code from my GitHub repository.

Home Sign Up Log In. Boolean Algebra. IP Address.The linear scale is used to chart numerical data. As the name suggests, linear interpolation is used to determine where a value lies in relation the center of the axis.

The axis has configuration properties for ticks, angle lines line that appear in a radar chart outward from the centerpointLabels labels around the edge in a radar chart. The following sections define each of the properties in those sections. The following options are provided by the linear scale. They are all located in the ticks sub options. The common tick configuration options are supported by this axis. Given the number of axis range settings, it is important to understand how they all interact with each other.

The suggestedMax and suggestedMin settings only change the data values that are used to scale the axis. These are useful for extending the range of the axis while maintaining the auto fit behaviour. In this example, the largest positive value is 50, but the data maximum is expanded out to However, because the lowest data value is below the suggestedMin setting, it is ignored. When these are set, some data points may not be visible.

If set, the scale ticks will be enumerated by multiple of stepSizehaving one tick per increment. If not set, the ticks are labeled automatically using the nice numbers algorithm. This example sets up a chart with a y axis that creates ticks at 0, 0. The following options are used to configure angled lines that radiate from the center of the chart to the point labels. They can be found in the angleLines sub options. The following options are used to configure the point labels that are shown on the perimeter of the scale.

They can be found in the pointLabels sub options.

chart js dotted line

Linear Radial Axis The linear scale is used to chart numerical data. The following additional configuration options are provided by the radial linear scale. Configuration Options The axis has configuration properties for ticks, angle lines line that appear in a radar chart outward from the centerpointLabels labels around the edge in a radar chart.

Name Type Description angleLines object Angle line configuration. Tick Options The following options are provided by the linear scale. Axis Range Settings Given the number of axis range settings, it is important to understand how they all interact with each other. Step Size If set, the scale ticks will be enumerated by multiple of stepSizehaving one tick per increment.

Name Type Default Description display boolean true if true, angle lines are shown. See MDN. Point Label Options The following options are used to configure the point labels that are shown on the perimeter of the scale. Name Type Default Description display boolean true if true, point labels are shown.

The default implementation simply returns the current string. No results matching " ". User defined minimum number for the scale, overrides minimum value from data.

User defined maximum number for the scale, overrides maximum value from data. Adjustment used when calculating the maximum data value. Adjustment used when calculating the minimum data value. Length and spacing of dashes on angled lines. Offset for line dashes.A line chart is a way of plotting data points on a line. Often, it is used to show trend data, or the comparison of two data sets. The line 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 colour of a line is generally set this way. All these values, if undefinedfallback first to the dataset options then to the associated elements. If the value is undefinedshowLine and spanGaps fallback to the associated chart configuration options. The rest of the values fallback to the associated elements. The 'default' algorithm uses a custom weighted cubic interpolation, which produces pleasant curves for all types of datasets.

If left untouched undefinedthe global options. If the steppedLine value is set to anything other than false, lineTension will be ignored. The line chart defines the following configuration options. These options are merged with the global chart configuration options, Chart. It is common to want to apply a configuration setting to all created line charts. The global line chart settings are stored in Chart. Changing the global options only affects charts created after the change.

Existing charts are not changed. When the data array is an array of numbers, the x axis is generally a category. The points are placed onto the axis using their position in the array. When a line chart is created with a category axis, the labels property of the data object must be specified. This alternate is used for sparse datasets, such as those in scatter charts. Each data point is specified using an object containing x and y properties.

Line charts can be configured into stacked area charts by changing the settings on the y axis to enable stacking.

Stacked area charts can be used to show how one data trend is made up of a number of smaller pieces. Line A line chart is a way of plotting data points on a line.

No results matching " ". Cap style of the line. See MDN.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I would like to draw dotted line using chartjs. I did not see any options in creating dotted lines.

I feel we need to extend the chartjs to support this. Can some one help me in this? In Chart. It takes an array of two numbers. See this codepen. Note - the alternative would be to just override bezierCurveTo using the chart object. This works because bezierCurveTo is only used to draw the line. If you wanted to do this for straight lines it wouldn't work because lineTo is used for other stuff axis, grid lines For dotted lines use borderDash and borderCapStyle.

The following example creates a dotted line 3px diameter :. Output better contrast for demonstration. Learn more. How can I draw dotted line using chartjs? Ask Question.

chart js dotted line

Asked 4 years, 4 months ago. Active 10 months ago. Viewed 9k times. Srinivas Raju Srinivas Raju 2 2 silver badges 4 4 bronze badges. Active Oldest Votes.