I have a React component, and inside the render method of the component I have something like this:
render() {
return (
<div>
<div>
// removed for brevity
</div>
{ switch(...) {} }
<div>
// removed for brevity
</div>
</div>
);
}
Now the point is that I have two div elements, one at the top and one at the bottom, that are fixed. In the middle I want to have a switch statement, and according to a value in my state I want to render a different component. So basically, I want the two div elements to be fixed always, and just in the middle to render a different component each time. I'm using this to implement a multi-step payment procedure). Though, as is the code currently it doesn't work, as it gives me an error saying that switch is unexpected. Any ideas how to achieve what I want?
Try this, which is way cleaner too: Get that switch out of the render in a function and just call it passing the params you want. For example:
renderSwitch(param) {
switch(param) {
case 'foo':
return 'bar';
default:
return 'foo';
}
}
render() {
return (
<div>
<div>
// removed for brevity
</div>
{this.renderSwitch(param)}
<div>
// removed for brevity
</div>
</div>
);
}
In contrast to other answers, I would prefer to inline the "switch" in the render function. It makes it more clear what components can be rendered at that position. You can implement a switch-like expression by using a plain old javascript object:
render () {
return (
<div>
<div>
{/* removed for brevity */}
</div>
{
{
'foo': <Foo />,
'bar': <Bar />
}[param]
}
<div>
{/* removed for brevity */}
</div>
</div>
)
}
That's happening, because switch statement is a statement, but here javascript expects an expression.
Although, it's not recommended to use switch statement in a render method, you can use self-invoking function to achieve this:
render() {
// Don't forget to return a value in a switch statement
return (
<div>
{(() => {
switch(...) {}
})()}
</div>
);
}