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LINE CHART

Index

Constructor Code

The below is the code for invoking a Linechart.

var lineChart = new LineChart(container_element, data, options)
  • container_element is the DOM element into which the Chart is to be appended.
  • data is the data required to draw the chart.
  • options are the optional features that can be used to alter the chart.

DOM Element

container_element is the element in which the graph is to be drawn. The container_element can be one of the following things,

  • Class Name of the element in the format .class-name. Eg: 
    <div class="chart-container" id="first-container"> </div>
    var element = '.chart-container';
  • ID of the element in the format #element-id. Eg: 
    <div class="chart-container" id="first-container"> </div>
    var element = '#first-container';
  • The whole DOM element itself. Eg: 
    <div class="chart-container" id="first-container"> </div>
    var element = document.querySelector('.chart-container'); // or
var element = document.querySelector('#first-container'); // or
var element = document.getElementsByClassName('chart-container')[0]; // or
var element = document.getElementById('first-container');

Data Format

The data format used for LineChart is simply an array of arrays. Each inner arrays contains the X and Y value of each co-ordinate.

Data Format:

[ [x1, y1], [x2, y2], ... , [xn, yn] ]

Example:

var data = [
    ['Jan', 10],
    ['Feb', 70],
    ['Mar', 30],
    ['Apr', 10],
    ['May', 60],
    ['Jun', 45],
    ['Jul', 76],
    ['Aug', 40],
    ['Sep', 40],
    ['Oct', 60],
    ['Nov', 40],
    ['Dec', 80]
];

Options

All the optional functionalities that is needed to be added to the graph are added in options part. This can be used for adding more functionalities or to customize the current graph. options is a javascript object. The following can be added in options part.

1. Line

Defines the attributes related to the Line of a line chart.

Attributes

  • color - The color of the line in the chart.
    • Expected Value: A valid HEX or RGB code or even name of the color.
  • width - Defines the width of the line in line Chart.
    • Expected Value: A positive real number.
  • icon - To specify the details of the icons used as plot points.
    • show - To specify whether the plot points need to be shown.
      • Expected Value: Boolean. true or false.
    • url - The URL for the image that need to be used as plot point.
      • Expected Value: The URL to the image, either relative path or whole URL. If no URL is provided and show is set to true, the color of the line is set as plot point.
    • toBase64 - To specify whether the image needs to be converted to Base64.
      • Expected Value: Boolean. true or false.
    • class - User defined CSS class name for image.
      • Expected Value: A user defined CSS class name.
    • width - Defines the width of the plot point image.
      • Expected Value: A positive real number.

Example:

var options = {
    line: {
        color : '#B8D551',
        width: 4,
        icon: {
            show: true,
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/green_circle.png',
            toBase64: false,
            class: 'point-icon',
            width : 10
        }
    }
};

2. Threshold

Helps to set the threshold value to each line, after which we can change the plot point image.

Attributes

  • value - The threshold value above which the plotpoint icon needs to be changed.
    • Expected Value: An integer.
  • icon - To specify the details of the icons used as plot points.
    • url - The URL for the image that need to be used as plot point.
      • Expected Value: The URL to the image, either relative path or whole URL. If no URL is provided and show is set to true, the color of the line is set as plot point.
    • toBase64 - To specify whether the image needs to be converted to Base64.
      • Expected Value: Boolean. true or false.
    • width - Defines the width of the plot point image.
      • Expected Value: A positive real number.

Example:

var options = {
    threshold: {
      value : 80,
        icon: {
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/orange_circle.png',
            toBase64: false
        }
    }
};

3. Connect Null

Defines what should be done, if the user data contains null as y-axis value.

Attributes

  • connectNull - Whether to avoid the null value and draw a single line or break the line into two when a null value is found.
    • Expected Value: Boolean. true or false. true will give output as a single line.

Example:

var options = {
    connectNull: true
};

4. Grids

Defines the properties of the grids lines that are to be added on the graph.

Attributes

  • vertical - To define the properties of vertical grid lines.
    • show - To specify whether the vertical grid lines need to be displayed or not.
      • Expected Value: Boolean. true or false.
    • color - The color of the vertical grid line of the chart.
      • Expected Value: A valid HEX or RGB code or even name of the color.
    • opacity - To mention the opacity of the vertical grid lines.
      • Expected Value: A real number between 0 and 1 (both inclusive).
    • values - The values in x-axis to which the vertical line needs to be drawn.
      • Expected Value: An array of values, which are in the x-axis value of the graph.
  • horizontal - To define the properties of horizontal grid lines.
    • show - To specify whether the horizontal grid lines need to be displayed or not.
      • Expected Value: Boolean. true or false.
    • color - The color of the horizontal grid line of the chart.
      • Expected Value: A valid HEX or RGB code or even name of the color.
    • opacity - To mention the opacity of the horizontal grid lines.
      • Expected Value: A real number between 0 and 1 (both inclusive).
    • values - The values in y-axis to which the horizontal line needs to be drawn.
      • Expected Value: An array of values, which are defined in the y-axis of the graph.
    • skipFirst - To specify whether to skip the first grid line.
      • Expected Value: Boolean. true or false.
    • skipLast - To specify whether to skip the last grid line.
      • Expected Value: Boolean. true or false.

Example:

var options = {
    grids : {
        vertical : {
            show : true,
            color : '#999',
            opacity : .5,
            values : [ 'Jan', 'Mar', 'May', 'Aug', 'Oct', 'Dec']
        },
        horizontal : {
          show : true,
          color : '#999',
          opacity : .5,
          values : [0, 10, 30, 50, 70, 90],
          skipFirst : false,
          skipLast : false
        }
    }
};

5. Transition

Defines the transition or animation of the lines involved in the graph.

Attributes

  • animate - To specify whether animation is needed or not.
    • Expected Value: Boolean. true or false.
  • duration - To specify the duration of animation of drawing the line.
    • Expected Value: A positive integer which is duration in milliseconds.

Example:

var options = {
    transition: {
        animate: true,
        duration : 2000
    }
};

6. Margin

Defines the margin that should be added to the canvas by the user.

Attributes

  • left - The amount of margin on left side.
    • Expected Value: A non negative integer.
  • right - The amount of margin on right side.
    • Expected Value: A non negative integer.
  • top - The amount of margin at the top.
    • Expected Value: A non negative integer.
  • bottom - The amount of margin at the bottom.
    • Expected Value: A non negative integer.

Example:

var options = {
    margin : {
        left : 20,
        right : 20,
        top : 0,
        bottom : 0
    }
};

7. Goal Line

Defines about an additional horizontal line, user can draw on the graph as a reference base line.

Attributes

  • value - The value on Y Axis at which the line is to be drawn.
    • Expected Value: A defined value on Y-axis.
  • class - User defined CSS class for goal line.
    • Expected Value: A user defined CSS class name.
  • icon - An image that can be on the top of the line.
    • url - URL to the image that needs to be added.
      • Expected Value: The URL to the image, either relative path or whole URL.
    • toBase64 - To specify whether the image needs to be converted to Base64.
      • Expected Value: Boolean. true or false.
    • class - User defined CSS class name for image.
      • Expected Value: A user defined CSS class name.
    • height - Height of the image that is added.
      • Expected Value: A positive integer value.
    • width - Width of the image that is added.
      • Expected Value: A positive integer value.
    • left - Amount by which the added image must be shifted to left.
      • Expected Value: A non negative integer value.

Example:

var options = {
    goalLine : {
        value : 50,
        class : 'goal-line-class',
        icon: {
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/goal_arrow.png',
            toBase64: true,
            class: 'goal-icon-class',
            height : 15,
            width : 13,
            left: 0
        }
    }
};

8. Tooltip

Defines about the tooltip that shows co-ordinates details. The co-ordinates values are available in the scope and can be accessed by using this.xValue and this.yValue for X and Y axis values.

Attributes

  • show - To specify whether the tooltip needs to be displayed or not.
    • Expected Value: Boolean. true or false.
  • class - User defined CSS class name for the tooltip.
    • Expected Value: A user defined CSS class name.
  • listener - Listeners to which the tooltip should appear/disappear.
    • Expected Value: Valid listeners. If more than one, separated by space.
  • body - Predefined template for body of tooltip.
    • title - Title to be shown on tooltip body.
      • Expected Value: A string value for title.
    • xLabel - Label for X Axis values.
      • Expected Value: A string value for x axis value label.
    • yLabel - Label for Y Axis values.
      • Expected Value: A string value for y axis value label.
  • formatter - User defined function that can be used to create the customized tooltip. Within the function, user can get the current x-axis and y-axis value as shown below
    • this.xValue - Contains the x axis value for the point.
    • this.yValue - Contains the y axis value for the point.

Example:

var options = {
    tooltip: {
        show : true,
        listener : 'click touchstart',
        class : 'custom-tooltip',
        body : {
            title : 'SALES 2017',
            xLabel : 'Month',
            yLabel : 'Units sold'
        },
        formatter : function() {
            return this.yValue + ' units <br>in ' + this.xValue;
        }
    }
};

9. Axis

Defines about the various attributes of X and Y axis.

Attributes

  • xAxis - Details and specifications about the x-axis.
    • orientation - To specify the position of the x-axis.
      • Expected Value: top or bottom.
    • showAxisLine - To specify whether to show the x-axis line or not.
      • Expected Value: Boolean. true or false.
    • firstLabel - To specify whether the first label in the x-axis should be shown or not.
      • Expected Value: Boolean. true or false.
    • ticks - To details about the ticks that should appear in x-axis.
      • values - Values for which ticks need to be shown. - Expected Value: This can be done in 2 ways as the user wants. i) Array of valid values in x-axis for which the ticks needs to be shown. [value1, value2, ..., valuen] ii) Array of objects which contains valid x-axis values and its required labels. [{ value : value1, label : label1 }, { value : value2, label : label2 }, ..., { value : value3, label : label3 } ]
      • fontSize - Font size of the tick values of the x-axis.
        • Expected Value: A positive number or a positive number along with its unit.
      • padding - Amount of padding that needed to be given from x-axis.
        • Expected Value: A positive number or a positive number along with its unit.
      • position - To specify the changes in x and y co-ordinates and rotation.
        • angle - The angle by which the label needs to be rotated.
          • Expected Value: A real number.
        • x - Amount needed to be shifted along the x-axis.
          • Expected Value: A real number.
        • y - Amount needed to be shifted along the y-axis.
          • Expected Value: A real number.
        • formatter - User defined function that can be used to create the customized axis labels. The value of the current tick is available as parameter of the function.
  • yAxis - Details and specifications about the y-axis.
    • orientation - To specify the position of the y-axis.
      • Expected Value: left or right.
    • showAxisLine - To specify whether to show the y-axis line or not.
      • Expected Value: Boolean. true or false.
    • firstLabel - To specify whether the first label in the y-axis should be shown or not.
      • Expected Value: Boolean. true or false.
    • ticks - To details about the ticks that should appear in y-axis.
      • values - Values for which ticks need to be shown. - Expected Value: This can be done in 2 ways as the user wants. i) Array of valid values in x-axis for which the ticks needs to be shown. [value1, value2, ..., valuen] ii) Array of objects which contains valid y-axis values and its required labels. [{ value : value1, label : label1 }, { value : value2, label : label2 }, ..., { value : value3, label : label3 } ]
      • fontSize - Font size of the tick values of the y-axis.
        • Expected Value: A positive number or a positive number along with its unit.
      • padding - Amount of padding that needed to be given from y-axis.
        • Expected Value: A positive number or a positive number along with its unit.
      • position - To specify the changes in x and y co-ordinates and rotation.
        • angle - The angle by which the label needs to be rotated.
          • Expected Value: A real number.
        • x - Amount needed to be shifted along the x-axis.
          • Expected Value: A real number.
        • y - Amount needed to be shifted along the y-axis.
          • Expected Value: A real number.
        • formatter - User defined function that can be used to create the customized axis labels. The value of the current tick is available as parameter of the function.

Example:

var options = {
    axis : {
        xAxis : {
            showAxisLine : true,
            firstLabel : true,
            orientation: 'bottom',
            ticks : {
                values : [ { value : 'Jan',  label : 'January' },
                           { value : 'Mar',  label : 'March' },
                           { value : 'May',  label : 'May' },
                           { value : 'Aug',  label : 'August' },
                           { value : 'Oct',  label : 'October' },
                           { value : 'Dec',  label : 'December' } ],
                fontSize : '12px',
                padding : 10,
            }
        },
        yAxis : {
            showAxisLine : true,
            firstLabel : true,
            orientation: 'left',
            ticks : {
                values: [ 10, 30, 50, 70, 90],
                fontSize : '12px',
                formatter : function(value) {
                    return String(value) + 'k units';
                },
                position :  {
                    angle : 30,
                    x : -5,
                    y : -10
                },
            }
        }
    }
};

Examples

Here are the examples of the chart drawn, without using any options and with using the options that are available.

<div class="chart-container" id="first-container"> </div>
var element = document.querySelector('.chart-container');

var data = [
    ['Jan', 10],
    ['Feb', 70],
    ['Mar', 30],
    ['Apr', 10],
    ['May', 60],
    ['Jun', 45],
    ['Jul', 76],
    ['Aug', 40],
    ['Sep', 40],
    ['Oct', 60],
    ['Nov', 40],
    ['Dec', 80]
];

Basic Chart Example

Code Snippet:

var chart = new LineChart(element, data);

Output:

Basic Line Chart Example

Live example:

Editable working example here

Full option Chart Example

Code Snippet:

var chart = new LineChart(element, data, {
    line: {
        color: '#B8D551',
        width: 4,
        icon: {
            show: true,
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/green_circle.png',
            toBase64: false,
            class: 'point-icon',
            width: 10
        }
    },
    threshold: {
        value: 50,
        icon: {
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/orange_circle.png',
            toBase64: false,
        }
    },
    grids: {
        vertical: {
            show: true,
            color: '#999',
            opacity: .5,
        },
        horizontal: {
            show: true,
            color: '#999',
            opacity: .5,
            skipFirst: false,
            skipLast: false,
            values: [10, 30, 50, 70, 80]
        }
    },
    transition: {
        animate: true,
        duration: 2000
    },
    margin: {
        left: 0,
        right: 0,
        top: 0,
        bottom: 0
    },
    goalLine: {
        value: 50,
        class: 'goalline',
        icon: {
            url: 'https://bharadhwajcn.github.io/fubar-charts/images/goal_arrow.png',
            class: 'goal-icon',
            height: 15,
            width: 13,
            left: 0
        }
    },
    axis: {
        xAxis: {
            showAxisLine: false,
            firstLabel: true,
            orientation: 'bottom',
            ticks: {
                values: ['Jan', 'Mar', 'May', 'Aug', 'Oct', 'Dec'],
                padding: 10,
                formatter: function(value) {
                    return value + " '17";
                }
            }
        },
        yAxis: {
            showAxisLine: false,
            firstLabel: false,
            orientation: 'left',
            ticks: {
                values: [
                    { value: 10, label: '10 m unit' },
                    { value: 30, label: '30 m unit' },
                    { value: 50, label: '50 m unit' },
                    { value: 70, label: '70 m unit' },
                    { value: 90, label: '90 m unit' },
                ],
                position : {
                    x : 0,
                    y : 10
                },
                font_size: '12px',
            }
        }
    },
    tooltip: {
        show: true,
        listener: 'click touchstart',
        class: 'custom-tooltip',
        formatter: function() {
          return this.yValue + ' units <br>in ' + this.xValue;
        }
    },
    connectNull: true
});

Output:

Full option Line Chart Example

Live example:

Editable working example here