Hey, what's up? This is part 3 of our charts in five minutes series. Let's make a line chart.

how to make a line chart

Line Chart Breakdown

We have a basic HTML template for all chart types included in our download package here

HTML

The easiest way to get started is referencing our CDN link. Place this in the head of your HTML Document. Next, create a <div> to hold your chart. Give it an ID we can reference later.

<!DOCTYPE html>  
<html>  
  <head>
  <script src= "https://cdn.zingchart.com/zingchart.min.js"></script>
  </head>
  <body>
    <div id="chart-div"></div>
  </body>
</html>  

CSS

Give your chart <div> some height & width. Your chart will not render otherwise.

#chart-div {
  height: 350px;
  width: 600px;
}

JavaScript

Declare a variable to hold your chart data. The type attribute is used to declare your chart type. In this case, we will be using 'line'.

var chartData ={  
  type: 'line', //'line3d' & 'vline' (vertical line) also available
};

Place your data into the series attribute. You can hard code into an array or refer from a database.

var chartData ={  
  type: 'line',
  series: [
  {
    values: [35,42,67,89]
  }
  ]
};

Finally, use the ZingChart render function to display the chart.

zingchart.render({  
  id: 'chart-div',
  data: chartData
});

When you finish all of that, your document should look like this:

<!DOCTYPE html>  
<html>  
  <head>
    <script src= "https://cdn.zingchart.com/zingchart.min.js"></script>
    <style>
      #chart-div {
        height: 200px;
        width: 200px;
      }
    </style>
  </head>
  <body>
    <div id="chart-div"></div>
    <script>
      var chartData ={
        type: 'line',
        series: [
        {
          values: [35,42,67,89]
        }
        ]
        };
      zingchart.render({
        id: 'chart-div',
        data: chartData
      });
    </script>
  </body>
</html>  

Line Chart Overview

  1. Line charts show how quantitative values change over time

  2. Y-axis will be your 'quantities' values

  3. X-axis will be your 'time' values

Which Data Is Best Suited For line Charts

Single Series: A single array of consecutive numbers. This is the easiest way to use our line charts & it will output one line chart.

Multiple Series: You can have multiple arrays along with multiple values attributes in the series attribute. Each values attribute represents a new line.

Common Ways To Input Data Into Line Charts

Variables & Arrays

var adRevenue = [100, 125, 75, 200];  
var organicRevenue = [225, 215, 255, 300];

var myConfig = {  
  type: 'line',
  series: [
  {
    values: adRevenue
  },
  {
    values: organicRevenue
  }
  ]
};

This will be the output.
how to make a line chart

Variables & Array Of Arrays

var adRevenue = [['Jan', 100], ['Feb', 125], ['Mar', 75], ['Apr', 200]];  
var organicRevenue = [['Jan', 225], ['Feb', 215], ['Mar', 255], ['Apr', 300]];

var myConfig = {  
  type: 'line',
  series: [
  {
    values: adRevenue
  },
  {
    values: organicRevenue
  }
  ]
};

This will be your output:
how to make a line chart

How To Use Line Charts

  1. Comparing how quantitative values for different categories have changed over time.

How Not To Use Line Charts

  1. Start at a 0 baseline.

  2. Make sure your scales are correct (to scale haha).

  3. Use an interactive legend for multiple series. This way you can isolate certain pieces of data.

Most Relevant Interactive Features

  1. Legend: Allows you to toggle through data. Very useful for comparisons.

  2. Markers: Allows you highlight significant thresholds in data like sales goals.

  3. Labels: Allows you to highlight significant points across data sets.

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