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How to check if the IText object has fill using FabricJS?
In this tutorial, we are going to learn about how to check if the IText object has fill 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 check if an IText object has fill by using the hasFill method.
Syntax
hasFill()
Return Value
The hasFill() method returns a boolean value:
-
true- if the object has a visible fill color -
false- if the fill is transparent or not set
Example 1: Using hasFill method when transparent fill is used
Let's see a code example to see the logged output when hasFill method is used along with a transparent fill. The hasFill method returns a true value if the object has a fill colour. In this example, we have set the fill colour as "transparent". Therefore, the logged output will be false.
<!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>Using hasFill method when transparent fill is used</h2>
<p>You can open console from dev tools and see that the logged output is false</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: 60,
top: 70,
fill: "transparent",
fontStyle: "bold",
backgroundColor: "#f8f4ff",
stroke: "black",
}
);
// Add it to the canvas
canvas.add(itext);
// Using the hasFill method
console.log("The value is: ", itext.hasFill());
</script>
</body>
</html>
The value is: false
Example 2: Using the hasFill method with color fill
Let's see a code example to see the logged output when the hasFill method is used. In this case a true value will be returned since the IText object has a fill colour.
<!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>Using the hasFill method</h2>
<p>You can open console from dev tools and see that the value is being displayed in the console</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 \ndolor sit amet",{
width: 300,
left: 60,
top: 70,
fill: "#b666d2",
fontStyle: "bold",
backgroundColor: "#f8f4ff",
stroke: "black",
}
);
// Using the hasFill method
console.log("The value is: ", itext.hasFill());
// Add it to the canvas
canvas.add(itext);
</script>
</body>
</html>
The value is: true
Key Points
- The
hasFill()method is useful for checking if text has visible fill before applying certain operations - A transparent fill is considered as no fill, returning
false - Any visible color value (hex, rgb, color names) will return
true - This method helps in conditional styling and canvas operations
Conclusion
The hasFill() method provides a simple way to check if an IText object has a visible fill color. Use it to conditionally apply styling or determine rendering behavior in your FabricJS applications.
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