hi i'm new to reactjs and i want to learn how to hide and show a div on button click. This is the view part i want to hide
<div className="comment_usr_details">
<div>
<img className="comment_usr_pic" src={profilePicture} alt=""/>
</div>
<div className="b">
<p className="c">John Smith</p>
<p className="d">1 minutes ago</p>
</div>
<img className="e" src={downarrow} alt=""/>
</div>
The most common pattern to this is selectively rendering the element based on state.
class Foo extends React.Component {
state = { showing: true };
render() {
const { showing } = this.state;
return (
<div>
<button onClick={() => this.setState({ showing: !showing })}>toggle</button>
{ showing
? <div>This is visible</div>
: null
}
</div>
)
}
}
You can also use a style based on state. This is less common, but can be useful when you have complex components inside that div - one recent example, I had a complex non-React D3 graph within a toggle-able component, initially, I used the first method above, but caused quite a bit of lagging when flicking the div on/off because D3 was cycling up again.
Generally use the first approach though, unless you have a reason to use the alternative.
class Foo extends React.Component {
state = { showing: true };
render() {
const { showing } = this.state;
return (
<div>
<button onClick={() => this.setState({ showing: !showing })}>toggle</button>
<div style={{ display: (showing ? 'block' : 'none') }}>This is visible</div>
</div>
)
}
}
I use the ?: ternary operator instead of && - I'm a strong believer that the use of && is relying on a side effect of that operator to achieve a certain outcome. It works, don't get me wrong, but the ternary operator, in my opinion, is far more expressive and was designed to be a conditional.
This last bit is just my opinion - so I'm not questioning the use of &&.
In React you just don't render that portion of the HTML. So make it part of a conditional:
{ this.props.display &&
<div className="comment_usr_details">
...
</div>
}
So if this.props.display is true the div shows and if it's false it doesn't.
class HideAndShowDivOnClick extends React.Component {
state = {
showDiv: true
}
render() {
const { showDiv } = this.state
return (
<div>
<button onClick={() => this.setState({ showDiv: !showDiv })}>
{ showDiv ? 'hide' : 'show' }
</button>
{ showDiv && (
<div id="the div you want to show and hide">Peek a boo</div>
)}
</div>
)
}
}