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How to change the duration of cursor fadein in IText using FabricJS?
In this tutorial, we are going to learn about how to change the duration of cursor fadein in 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. Likewise, we can change the duration of cursor fadein by using the cursorDuration property.
Syntax
new fabric.IText(text: String, { cursorDuration: Number }: Object)
Parameters
-
text ? This parameter accepts a String which is the text string that we want to display as our text.
-
options (optional) ? This parameter is an Object which provides additional customizations to our IText object. Using this parameter colour, cursor, stroke width and a lot of other properties can be changed related to the IText object of which cursorDuration is a property.
Options Keys
-
cursorDuration ? This property accepts a Number value which allows us to change the duration of cursor fade in in "ms". The default value is 600ms.
Example 1: Default Cursor Duration
Default appearance of IText object
Let's see a code example to see the default appearance of IText object when the cursorDuration property is not used. As we have not specified anything, the cursor fadein will have the default value of 600ms.
<!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's cursor duration</h2>
<p>You can click on the IText object to see the default cursor fadein</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: 50,
top: 70,
fill: "red",
});
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Example 2: Custom Cursor Duration
Passing the cursorDuration property as key with a custom value
In this example, we have passed the cursorDuration property as key with the value as 200ms. This will ensure that our cursor fadein happens more rapidly.
<!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 cursorDuration property as key with a custom value</h2>
<p>You can click on the IText object to see the cursor fadein occuring more rapidly</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: 50,
top: 70,
fill: "red",
cursorDuration: 200,
});
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
Key Points
- The default cursor fadein duration is 600ms
- Lower values create faster cursor animations
- Higher values create slower, more gradual cursor animations
- The property accepts numeric values in milliseconds
Conclusion
The cursorDuration property in FabricJS IText allows you to control the timing of cursor fade-in animations. By adjusting this value, you can create faster or slower cursor transitions to match your application's visual requirements.
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