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How to add linethrough to IText using FabricJS?
In this tutorial, we are going to learn about how to add linethrough to IText object using FabricJS. The IText class was introduced in FabricJS version 1.4, extends fabric.Text and is used to create IText instances. An IText instance gives us the freedom to select, cut, paste or add new text without additional configurations. There are also various supported key combinations and mouse/touch combinations which make text interactive which are not provided in Text.
Textbox, however, which is based on IText allows us to resize the text rectangle and wraps lines automatically. This is not true for IText as height is not adjusted based on the wrapping of lines. We can manipulate our IText object by using various properties. Similarly, we can add linethrough by using the linethrough property.
Syntax
new fabric.IText(text: String, { linethrough: Boolean }: 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 IText object. Using this parameter colour, cursor, border width and a lot of other properties can be changed related to the object of which linethrough is a property.
Options Keys
linethrough ? This property accepts a Boolean value that allows us to specify whether we want text decoration linethrough or not.
Example 1: Default appearance of IText object
Let's see a code example to see how our IText object looks like when linethrough property is not used.
<!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 IText object</h2>
<p>You can see that there is no linethrough on text</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 an itext object
var itext = new fabric.IText("Add Sample Text Here.", {
width: 300,
left: 60,
top: 70,
fill: "green",
});
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Example 2: Using linethrough property
In this example, we are passing the linethrough property as key, with a value as true which will add linethrough to our IText object.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/510/fabric.min.js"></script>
</head>
<body>
<h2>Passing the linethrough property as key with the value as true</h2>
<p>You can see that the linethrough has been added</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 an itext object
var itext = new fabric.IText("Add Sample Text Here.", {
width: 300,
left: 60,
top: 70,
fill: "green",
linethrough: true,
});
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Key Points
- The
linethroughproperty accepts a Boolean value (true/false) - Setting
linethrough: trueadds a horizontal line through the text - This property can be combined with other text styling options like fill, fontSize, and fontFamily
- The linethrough decoration is applied to the entire IText object
Conclusion
The linethrough property in FabricJS provides an easy way to add strikethrough text decoration to IText objects. Simply set it to true in the options object to apply the effect.
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