Can only set one of `children` or `props.dangerouslySetInnerHTML` - reactjs

Question

I'm trying to set the inner HTML of an alert div, but receiving the error message : Can only set one of 'children' or props.dangerouslySetInnerHTML'.
Why does this happen ?
function alertContent(alert) { return {__html: alert.text} }
const Alerts = ({ alerts=[{level: 'warning', text:'<p>Warning message!</p>'}], onDismiss }) => (
<div className="alerts">
{alerts.map(alert =>
<Alert
bsStyle={alert.level}
key={alert.id}
onDismiss={onDismiss}
dangerouslySetInnerHTML={alertContent(alert)}
></Alert>
)}
</div>
)

Answer 1

I had this error message in a react application.
My issue was I had code as below
<p dangerouslySetInnerHTML={{ __html:stringContainingHtml}}> </p>
My issue was the space in the <p> </p> tags - since html gets injected inside these tags the space was causing an issue as it wasn't empty.
Hope this might help some people.

Answer 2

This happens because dangerouslySetInnerHTML can only be applied to one element. In your case, <Alert/> is a complex element made up of multiple children. That being said, the BS Alert component does accept HTML:
<Alert bsStyle="warning">
<strong>Holy guacamole!</strong> Best check yo self, you're not looking too good.
</Alert>
or
<Alert bsStyle="warning">
<span dangerouslySetInnerHTML={alertContent(alert)} />
</Alert>

Answer 3

Solution, You have to make a separate component to render element in which you are using dangerously set.....
For Example:
const RenderHTML = (props) => (<span dangerouslySetInnerHTML={{__html:props.HTML}}></span>)
YourData.map((d,i) => {
return <RenderHTML HTML={d.YOUR_HTML} />
})

Answer 4

you have to close the html tag short hand if there aren't inner HTML
<Alert dang...={} />
instead <Alert></Alert>

Answer 5

I have solved this issue myself.
When you are recursively rendering a component, you must separate out the part of the component where dangerouslySetInnerHTML is being used into another component and then use that component in the one you are recursively rendering.