Exploring the focus() method of refs in Vue 3

I'm struggling to comprehend why my straightforward test case keeps failing. As I delve into the world of testing in Vue, I've created a simple test where the element.focus() is triggered

onMount(() => /* see implementation 👇*/)
.

Below is my component:

const myInputRef = ref<HTMLInputElement | null>(null);
  onMounted(() => {
    if (myInputRef.value) {
      myInputRef.value.focus()
    }
  })
</script>

<template>
  <input ref="myInputRef" name="my-input" type="text">
  <label for="my-input">input:</label>
</template>

And here's my test scenario:

describe('App', () => {
  it('should auto focus input element', async () => {
    const wrapper = mount(App);

    const inputElement = wrapper.find('input');

    expect(inputElement.exists()).toBeTruthy()

    await nextTick()

    expect(document.activeElement).toBe(inputElement.element)
  })
})

While

expect(inputElement.exists()).toBeTruthy()
works as expected, the issue arises with
expect(document.activeElement).toBe(inputElement.element)
, resulting in:

AssertionError: expected <body></body> to be <input name="my-input" …(1)></input> // Object.is equality

https://i.sstatic.net/wrKTe.png

What am I misunderstanding?

Answer â„–1

JavaScript Issue with enzyme.js and document.activeElement

We are currently addressing a common JavaScript problem, regardless of the specific framework or library being used.

In order to resolve this issue, it is important for the wrapper to be connected to the body of the document.

const wrapper = mount(App, { attachTo: document.body });
  • Sandbox Testing Environment
  • View Test Results Image

If you disable the line myInputRef.value.focus(), you will notice that the default value of activeElement shifts to the body element, as dictated by the attachTo parameter.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Steps for transforming an array of arrays into a JSX element within a React component, where each nested array contains its own clipPath

The array_groups variable consists of an array containing multiple arrays. Each inner array holds the coordinates of regular circles that are closely spaced together. The intention is to clipPath these inner circle arrays as a whole. When the mouse hovers ...

Implementing $modal.open functionality in AngularJS controller using Ui-Bootstrap 0.10.0

Is there a way to properly call $modal.open from the controller in AngularJS since the removal of the dialog feature in ui-bootstrap 0.1.0? What is the alternative method available in the current version? In previous versions like 0.1.0, it was simply don ...

Building an npm module locally: A step-by-step guide

Imagine I'm in the process of working on an application called MyApp and I want to create an NPM module for it, named MyModule. Currently, I can think of two approaches to developing it: Make changes -> save -> npm install /path/to/module in M ...

How to eliminate spaces while preserving line breaks in a textarea using JS or jQuery

I have been trying to figure out how to remove extra spaces from the beginning and end of lines while keeping the line breaks intact. Here's what I attempted: function removeSpaces(string) { return string.split(' ').join(''); } ...

Use a unique mockReturnValue for every test case in Vitest

During my unit testing for a React application, I encountered an issue with mocking a custom hook that returns data objects used to determine the rendering of certain elements in the component. While I was able to successfully mock the hook useGetStatusPag ...

Gathering information from an HTML form and displaying it through JavaScript by utilizing Bootstrap's card component

I've been working on integrating form data from my index.html page into a card component using Bootstrap. I've successfully collected the data in the backend, but now I'm struggling to display it on the frontend as a card component. Any help ...

Tips for tackling drag and drop functionality with only HTML, CSS, and JavaScript

Currently, I am faced with a challenge involving drag and drop TEST. Observing the image provided below, you will notice 3 columns each containing 3 small boxes of varying colors. These boxes are draggable, meaning they can be moved between columns follow ...

Techniques for incorporating a variable into the value field in JavaScript

let y = data[1]; cell1.innerHTML ='<input id="text" type="text" value= "'y'"/>' ; This snippet of code does not render any content when attempting to pass the variable, but if you provide a specific value like "h", it will displa ...

Generating Random Numbers Using Python and JavaScript Pseudo-Random Number Generation Algorithm

I am seeking a means to produce an identical series of pseudo-random integer numbers using both Python and JavaScript. Upon seeding in Python as shown below, I obtain the following outcomes: random.seed(3909461935) random.randint(0, 2147483647) = 1620 ...

Cycle through the list and populate the table with the data

My attempt to clarify this explanation is my best, as articulating exactly what I am trying to achieve is quite challenging: Initially, I have a list of names: { "Items": [ { "Id": 0, "Name": "Robinson" }, ...

The JavaScript library known as Microsoft JScript Angular is not recognized

While integrating Angular into my .Net MVC website, I keep running into a runtime error that reads as follows: 0x800a1391 - Microsoft JScript Runtime Error: 'angular' is undefined. This essentially means that the 'angular' object ...

Steps for adding a row as the penultimate row in a table

There aren't many solutions out there that don't rely on jQuery, but I'm looking to avoid it. The row content needs to be generated dynamically. Here is my flawed approach: function addRow() { let newRow = '<tr><td>B ...

Adding AngularJS to Syncfusion grid or making the rows clickable and running AngularJS functions can be achieved by following these steps

I'm currently incorporating angularJs and Syncfusion to display data in a table using the Syncfusion grid (). However, I'm encountering difficulties in utilizing angularjs functions within this grid: <div class="table-responsive grid-tog ...

Allowing Cross-Origin Resource Sharing on an Express Server hosted using Firebase Cloud Functions

Hey there, I have a simple Express setup on Firebase, shown below: import { onRequest } from 'firebase-functions/v2/https'; import express from 'express'; import bodyParser from 'body-parser'; import router from './router ...

Knockout.js Introduction - Identifying the Reason for Data Binding Failure

Trying out the most basic example of Knockout.js as showcased on their documentation page: I've followed the documentation instructions to set everything up correctly, and there are no errors showing on the page. However, the span that should display ...

What is the best way to handle a select input that may have varying options in

I'm struggling to figure out how to make each select input independent of each other when rendering them through a map function. How can I correctly implement this, especially considering that the data will be coming from a redux store in the future? ...

Arrange the objects in the array in React based on their time and date of creation

As a newcomer to the world of React.js and Redux, I am faced with an array of objects structured like this: quizList = [ { createdDate : 1543314832505, id:5bfd1d90d4ed830001f589fc, name:'abc'}, { createdDate : 1543314152180, id:5bfd1ae8d4ed83000 ...

Ensuring grid columns are equal for varying text sizes

I am looking to achieve equal width and spacing for columns without using the width, min-width, max-width properties. Can anyone help me accomplish this using flex or any other method? https://i.sstatic.net/xo56M.png .d-flex { display: flex; } .d-fl ...

String includes another String not refreshing automatically

How come myCtrl.greeting doesn't automatically update when I change myCtrl.name? angular.module('MyApp', []) .controller('MainController', [function(){ var mCtrl = this; mCtrl.name = ''; mCt ...

Unable to retrieve props from server-side page to client-side component in a Next.js application router

Currently, I am utilizing app router alongside Next.js version 13.5. Within my /dashboard page (which is a server component), there is an ApiKeyOptions client component embedded. However, when attempting to pass props from the dashboard page to the ApiKeyO ...