Change style on MouseOver event in reactJS, functional component

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I have a component and three div tag's in it. In one of the div tag, I created onMouseOver event and trying to change color of text onMouseOver.

React onMouseOver, onMouseEnter events and style are changing dynamically in React.

import React from 'react'

function Middle() {
    const styles = {


        'text-align': 'center',
        'padding': '30px',
    }
    function myName() {
        styles.color = "green"

    }
    function noName() {

    }

    return (
        <div className="middle">

            <div id="cspace" style={styles} onMouseEnter={myName} onMouseLeave={noName}>
                <h1>Hello World</h1>
            </div>

        </div>
    )
}

export default Middle

I am expecting the color of text in div to be changed. the output I am getting is:

"Cannot add property color, object is not extensible"

Instead of doing this with onMouseEnter & onMouseLeave, I would recommed you to go with CSS since those operations are lightweight when compared with the Javascript operations like onMouseEnter & onMouseLeave

function Middle() {
    const styles = {
        'text-align': 'center',
        'padding': '30px',
    }
    return (
        <div className="middle">

            <div id="cspace" style={styles}>
                <h1>Hello World</h1>
            </div>

        </div>
    )
}

ReactDOM.render(<Middle />, document.getElementById("root"));
#cspace:hover{
  color: green;
  cursor:pointer;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<div id="root"></div>

React onHover Event Handling (with Examples), A banner showing a title that reads onHover Event Handling in React, Therefore, React has provided the following event handlers for detecting the hover state for an element: App.css'; function App() { const [isShown, setIsShown] Example: Change the Background Color of an Element After Hovering  The changeBackground function receives the event object (which is passed automatically through any event handler to a function), and changes the style.background value to ‘red’. Save this component, jump over to your running React app in your browser and hover over the button. You should see the button’s background color change to red.

you can do this using css only. try this.

#cspace:hover{color:red;}

How to add onMouseEnter or onMouseOver in ReactJS, Use onMouseOver when you want it to trigger a selcted element and it's child elements. <style> #my_div { height: 120px; width: 120px; background-color: #​333; } in React, you must embed our event handler function to onMouseEnter . We set the base colors of the p tag to black and when we hover, we change the color and the cursor to mimic what happens when a button or a tag is hovered. There are 3 ways that we can achieve this. Styled-Components. Styled Components is one of my favorite libraries to use to style html. yarn add styled-components. npm install styled-components

For a functional component, this is a good scenario to use useState hook to store the color value.

function App() {
  const [color, setColor] = React.useState("");
  const styles = {
    "text-align": "center",
    padding: "30px",
    color: color
  };

  return (
    <div className="middle">
      <div
        id="cspace"
        style={styles}
        onMouseEnter={() => setColor("green")}
        onMouseLeave={() => setColor("")}
      >
        <h1>Hello World</h1>
      </div>
    </div>
  );
}

See CodeSandbox

How to add hover events to any React component, p and button tags aren't the only tags that can have hover events! tag to black and when we hover, we change the color and the cursor to Styled Components is one of my favorite libraries to use to style html. all posts; ReactJS; NodeJS; React Native; Misc; Windows; Deploying; Database; Networking. Best ways to style react components in 2019. Learn about Inline CSS, CSS modules with Sass, SCSS and Less, CSS in JS, Styled-Components, Stylabe. Scale your architecture with modular component styling

React Tutorial: Change State with React Hooks and Mouse Events , React Tutorial: Change State with React Hooks and Mouse Events I came across a really cool and useful hover effect on Colors & Fonts that Simply style your components with a global theme or based on different states. instance of useState with a state variable of font and a function of setFont . The onMouseOver event does not seem to trigger, no matter what I try. I can see that its bound to the component, but nothing happens when I mouse over. onClick works as expected. Where am I going astray? The code itself is a simple image gallery constructor that calls a 'Gallery' function from react-photo-gallery.

Best way to do an ng-mouseover class change for react? : reactjs, How do I "programmatically" change CSS properties in React, so to speak? listen to mouse events on the rendered elements, update the component's state in the callbacks, React Functional Components and Lodash High-Order Functions. The example above was of a functional component. If you’re using a Class component, you will have to bind the onChange event handler to the context of this. Example: Saving an Input Value Inside of State using onChange in a React Component. The final example we’ll explore today is how to store an input’s current value inside of a state value.

useHover React Hook, Just add the returned ref to any element whose hover state you want to monitor. that changes the element that hoverRef is added to then your event listeners will not import { useRef, useState, useEffect } from 'react'; // Usage function App(​)  The styles we define for one class in a component are available for the whole app. That means, that if we define a class "button" in component A and a class "button" in component B, we possibly end up with a mixture of both classes and the respective style properties. This is no new problem nor is it specific to react.

Comments
  • Why do you want to use the onMouseOver event? You could just add :hover to the css class of the div and change the color that way.
  • 1. You can do it with hooks. 2. Look at react-usestyles: github.com/andywer/react-usestyles
  • ideally, to make it work with CSS is the best way
  • yes you are right about :hover. I am just trying to understand why css changes are not working in that place after updating object using functions.