I am building a pulldown menu React component that should close when the user clicks anywhere in the DOM outside of the component.
Using jQuery I would typically add an event listener to the body
when the pulldown is opened, and remove it again when the pulldown is closed. (The event listener itself closes the pulldown – any click events within the component are not propagated to prevent the body click handler from firing.)
Is there any way to attach a listener to the body
element from within a React component? Or should I just use jQuery? (I'm a bit wary of mixing React and jQuery.)
React is just JavaScript so attaching a click handler to any element is done as normal by using addEventListener()
. Doing this in componentDidMount
is normally very nice and tidy and clean up after yourself in componentWillUnmount
by removing the added event handler.
var Component = React.createClass({
componentDidMount: function () {
document.body.addEventListener('click', this.myHandler);
},
componentWillUnmount: function () {
document.body.removeEventListener('click', this.myHandler);
},
myHandler: function () {
alert('click');
},
render: function() {
return <div>Hello {this.props.name}</div>;
}
});
It's help who used function based components:
import React, { useEffect } from 'react';
const ZSideBar = (props) => {
useEffect(() => {
document.body.addEventListener('click', closeSidemenu );
return function cleanup() {
window.removeEventListener('click', closeSidemenu );
}
},[]);
let closeSidemenu = () => {
document.getElementById("sidebar-tree").style.left = "-310px";
}
return (
<div></div>
)
}
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