How can I access a hover state in reactjs

Question

I have a sidenav with a bunch of basketball teams  So I would like to display something different for each team when one of them is being hovered over  Also  I am using Reactjs so if I could have a variable that I could pass to another component that would be awesome

User · Answer

I know the accepted answer is great but for anyone who is looking for a hover like feel you can use setTimeout on mouseover and save the handle in a map (of let's say list ids to setTimeout Handle). On mouseover clear the handle from setTimeout and delete it from the map

onMouseOver={() => this.onMouseOver(someId)}
onMouseOut={() => this.onMouseOut(someId)

And implement the map as follows:

onMouseOver(listId: string) {
  this.setState({
    ... // whatever
  });

  const handle = setTimeout(() => {
    scrollPreviewToComponentId(listId);
  }, 1000); // Replace 1000ms with any time you feel is good enough for your hover action
  this.hoverHandleMap[listId] = handle;
}

onMouseOut(listId: string) {
  this.setState({
    ... // whatever
  });

  const handle = this.hoverHandleMap[listId];
  clearTimeout(handle);
  delete this.hoverHandleMap[listId];
}

And the map is like so,

hoverHandleMap: { [listId: string]: NodeJS.Timeout } = {};

I prefer onMouseOver and onMouseOut because it also applies to all the children in the HTMLElement. If this is not required you may use onMouseEnter and onMouseLeave respectively.

User · Answer

React components expose all the standard Javascript mouse events in their top-level interface   Of course  you can still use  hover in your CSS  and that may be adequate for some of your needs  but for the more advanced behaviors triggered by a hover you ll need to use the Javascript  So to manage hover interactions  you ll want to use onMouseEnter and onMouseLeave   You then attach them to handlers in your component like so   lt ReactComponent     onMouseEnter       gt  this someHandler      onMouseLeave       gt  this someOtherHandler    gt   You ll then use some combination of state props to pass changed state or properties down to your child React components

User · Answer

ReactJs defines the following synthetic events for mouse events    onClick onContextMenu onDoubleClick onDrag onDragEnd onDragEnter onDragExit onDragLeave onDragOver onDragStart onDrop onMouseDown onMouseEnter onMouseLeave onMouseMove onMouseOut onMouseOver onMouseUp   As you can see there is no hover event  because browsers do not  define a hover event natively    You will want to add handlers for onMouseEnter and onMouseLeave for hover behavior   ReactJS Docs - Events

User · Answer

For having hover effect you can simply try this code  import React from  react     import    styles css        export default function App            function MouseOver event            event target style background    red                 function MouseOut event           event target style background                   return            lt div className  App  gt             lt button onMouseOver  MouseOver  onMouseOut  MouseOut  gt Hover over me  lt  button gt           lt  div gt                   Or if you want to handle this situation using useState   hook then you can try this piece of code  import React from  react   import    styles css     export default function App        let  over setOver  React useState false       let buttonstyle       backgroundColor           if over       buttonstyle backgroundColor  green         else      buttonstyle backgroundColor            return        lt div className  App  gt         lt button style  buttonstyle        onMouseOver      gt setOver true          onMouseOut      gt setOver false          gt Hover over me  lt  button gt       lt  div gt           Both of the above code will work for hover effect but first procedure is easier to write and understand

[hover] How can I access a hover state in reactjs?

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