How to add line height to multiline text in Text using FabricJS?

In this tutorial, we are going to learn about how to add line height to multiline text in Text object using FabricJS. We can display text on canvas by adding an instance of fabric.Text. Not only does it allow us to move, scale and change the dimensions of the text but it also provides additional functionality like text alignment, text decoration, line height which can be obtained by the properties textAlign, underline and lineHeight respectively. We can add extra height between lines by using the lineHeight property.

Syntax

new fabric.Text(text: String, { lineHeight: Number }: Object)

Parameters

  • text − This parameter accepts a String which is the text string that we want to display.

  • options (optional) − This parameter is an Object which provides additional customizations to our text. Using this parameter colour, cursor, border width and a lot of other properties can be changed related to the object of which lineHeight is a property.

Options Keys

  • ineHeight − This property accepts a Number that allows us to control the height between each line. Default value of lineHeight property is 1.16.

Example 1

Default appearance of a text object

Let’s see a code example to see how our text object looks like with the default value of lineHeight property. We will not pass any lineHeight key to the class in this example as given below:

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Default appearance of a text object</h2>
   <p>You can see the default line height in this example</p>
   <canvas id="canvas"></canvas>

   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);

      // Initiate a text object
      var text = new fabric.Text("Add sample 
 text here", {
         left: 50,
         top: 70,
      });

      // Add it to the canvas
      canvas.add(text);
   </script>
</body>
</html>

Example 2

Passing the lineHeight property as key

In this example, we will see how assigning a value to the lineHeight property changes the space between each line in a text object. Here we have used 2 as lineHeight which thus increases the height between each line.

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Passing the lineHeight property as key</h2>
   <p>You can see our text object now has a line height of 2</p>
   <canvas id="canvas"></canvas>

   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);

      // Initiate a text object
      var text = new fabric.Text("Add sample 
 text here", {
         left: 50,
         top: 70,
         lineHeight: 2,
      });

      // Add it to the canvas
      canvas.add(text);
   </script>
</body>
</html>

Updated on: 13-Sep-2022

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