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How to set the text overline of IText using FabricJS?
In this tutorial, we are going to learn how to set the text overline of IText 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 also set the text overline by using the overline property
Syntax
new fabric.IText(text: String , { overline : 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 object. Using this parameter colour, cursor, border width and a lot of other properties can be changed related to the object of which overline is a property.
Options Keys
overline ? This property accepts a Boolean value which allows us to control the text overline.
Example 1: Default appearance of the IText object
Let's see a code example to see how our IText object looks when the overline property is not used. In this case, our IText object will not contain text decoration overline.
<!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 the IText object</h2>
<p>You can see that the IText object does not contain text decoration overline</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.\nLorem ipsum dolor sit amet",{
width: 300,
left: 210,
top: 70,
fill: "#e7bb22",
}
);
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Example 2: Passing the overline property as key with a value
In this example, we will see how assigning a value to the overline property creates text decoration overline. Since we have passed the value as true, the IText object will now contain text that is overlined.
<!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 overline property as key with a value</h2>
<p>You can see that the IText object contains text decoration overline</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.\nLorem ipsum dolor sit amet",{
width: 300,
left: 210,
top: 70,
fill: "#e7bb22",
overline: true,
}
);
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Key Points
The
overlineproperty accepts a Boolean value (true/false)When set to
true, it adds a line above the textThis property works in combination with other text decoration properties like underline and linethrough
The overline appears above all lines of text in multi-line IText objects
Conclusion
The overline property in FabricJS IText provides an easy way to add decorative lines above text. Simply set overline: true in the options object to enable this text decoration feature.
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