Check If Parent Element Contains Child Element in JavaScript

Imran Alam
Updated on 01-Jul-2022 08:51:52

7K+ Views

In this tutorial, we are going to look at how we can return true if the parent element contains the child element in JavaScript. Assuming you have two HTML elements, a parent element, and a child element, and you want to know if the parent element contains the child element.Using the Node.contains() methodThe Node interface's contains() method returns a Boolean value, indicating whether a node is a descendant of a given node or not.If you want to know if the parent element contains the child element, you can use the Node.contains() method.Here's a simple example −    Some text The ... Read More

Difference Between Microtask Queue and Callback Queue in Asynchronous JavaScript

Imran Alam
Updated on 01-Jul-2022 08:41:46

3K+ Views

In asynchronous JavaScript, there are two ways to schedule tasks – microtask queue and callback queue. Both queues are handled differently by the JavaScript engine.Microtask QueueA Microtask queue is a queue of tasks that are executed after the current task. The microtask queue is handled by the JavaScript engine before it moves on to the next task in the callback queue.ExampleHere’s an example of how microtask queue works −    Examples               console.log('start');         setTimeout(function() {          console.log('setTimeout');       }, 0);   ... Read More

Remove Elements from Array Until Function Returns True in JavaScript

Imran Alam
Updated on 01-Jul-2022 08:33:48

455 Views

In JavaScript, there are various ways to remove elements from an array until the passed function returns true. In this tutorial, we are going to look at 3 methods in detail.Using Array.prototype.filter()The Array.prototype.filter() method can be used to remove elements from an array until the passed function returns true. Please refer to the Array filter() method for more details.Example 1The following code shows how to use this method −    Examples                   var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];       function ... Read More

Set Width of Stroke for Rectangle Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:45:35

491 Views

In this tutorial, we are going to learn how to set the width of stroke of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.The strokeWidth property allows us to specify the width of a stroke for an object.Syntaxnew fabric.Rect( { strokeWidth: Number }: Object)ParametersOptions (optional) − This parameter is an Object which provides additional customizations to our rectangle. Using this parameter, properties such as colour, cursor, stroke width and a lot of ... Read More

Set Vertical Scale Factor of Rectangle Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:44:19

186 Views

In this tutorial, we are going to learn how to set the vertical scale factor of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also set the vertical scale of a rectangle object. This can be done by using the scaleY property.Syntaxnew fabric.Rect({ scaleY : Number }: Object)ParametersOptions (optional) − This parameter is ... Read More

Set Style of Controlling Corners of a Rectangle Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:42:55

236 Views

In this tutorial, we are going to learn how to set the style of controlling corners of Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the style by using the cornerStyle property.Syntaxnew fabric.Rect({ cornerStyle: String ... Read More

Set Size of Controlling Corners of Rectangle using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:41:49

319 Views

In this tutorial, we are going to learn how to set the size of the controlling corners of a Rectangle using FabricJS. The controlling corners of an object allow us to scale, stretch or change its position.We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the size by using the cornerSize property.Syntaxnew fabric.Rect({ cornerSize: Number }: Object)ParametersOptions (optional) − This parameter is an Object which provides additional customizations to our rectangle. Using this parameter, properties such as colour, cursor, stroke width, and a lot of ... Read More

Set Position of Rectangle from Top Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:40:21

394 Views

In this tutorial, we are going to set the position of Rectangle using FabricJS. The top property allows us to manipulate the position of the object. By default, the top position is relative to the object’s top.Syntaxnew fabric.Rect({ top: Number }: Object)ParametersOptions (optional) − This parameter is an Object which provides additional customizations to our rectangle. 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 the top is a property.Options keystop − This property accepts a Number which allows us to set the top ... Read More

Set Padding of a Rectangle Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:37:35

627 Views

In this tutorial, we are going to learn how to set the padding of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also set the padding of a rectangle object. This can be done by using the padding property.Syntaxnew fabric.Rect({ padding : Number }: Object)ParametersOptions (optional) − This parameter is an Object which ... Read More

Set Opacity of a Rectangle Using Fabric.js

Rahul Gurung
Updated on 30-Jun-2022 14:35:25

488 Views

In this tutorial, we are going to learn how to set the opacity of Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.We can customize a rectangle object by adding a fill colour to it, eliminate its borders or even make changes in its dimensions. Similarly, we can also change its opacity by using the opacity property.Syntaxnew fabric.Rect({ opacity: Number }: Object)ParametersOptions (optional) − This parameter is an Object which provides additional customizations to ... Read More

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