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How to lock the vertical movement of Textbox using FabricJS?
In this tutorial, we are going to learn how to lock the vertical movement of a Textbox using FabricJS. Just as we can specify the position, colour, opacity and dimension of a textbox object in the canvas, we can also specify whether we want it to move only in the X-axis. This can be done by using the lockMovementY property.
Syntax
new fabric.Textbox(text: String, { lockMovementY: Boolean }: Object)
Parameters
text − This parameter accepts a String which is the text string that we want to display inside our textbox.
options (optional) − This parameter is an Object which provides additional customizations to our Textbox. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the object of which lockMovementY is a property.
Options Keys
lockMovementY − This property accepts a Boolean value. If we assign it a ‘true’ value, then the object will no longer be able to move in the vertical direction.
Example 1
Default behaviour of a Textbox object in the canvas
Let’s see a code example to understand how we can move our textbox object in the X-axis or the Y-axis freely when lockMovementY property is not assigned a "true" value.
<!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 behaviour of a Textbox object in the canvas</h2> <p>Drag the Textbox across the X-axis or Y-axis and observe that movement is allowed in both directions.</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 textbox object var textbox = new fabric.Textbox("If you're not confused, you're not paying attention.", { backgroundColor: "#fffff0", width: 400, left: 110, top: 70, fill: "violet", strokeWidth: 2, stroke: "pink", textAlign: "center", }); // Add it to the canvas canvas.add(textbox); </script> </body> </html>
Example 2
Passing lockMovementY as key with "true" value
In this example, we will see how we can lock the vertical movement of a textbox object. By assigning the lockMovementY property a "true" value, we essentially cease movement in the vertical direction.
<!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 lockMovementY as key with "true" value</h2> <p>Drag the Textbox across the X-axis or Y-axis and observer that movement is no longer allowed in the vertical direction</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 textbox object var textbox = new fabric.Textbox("If you're not confused, you're not paying attention.", { backgroundColor: "#fffff0", width: 400, left: 110, top: 70, fill: "violet", strokeWidth: 2, stroke: "pink", textAlign: "center", lockMovementY: true, }); // Add it to the canvas canvas.add(textbox); </script> </body> </html>
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