Map Function In React (err: Typeerror: E.map Is Not A Function)
I want to render items from props, I can do it with initial state, but not with response from server. My render function : const { data } = this.props; return (
Solution 1:
Had to change parent component change this:
this.setState({
data: response
})
to
this.setState({
data: response.data
})
I've tried to reach the data from the child component, but it din't work (probably because of the map function)
Solution 2:
It looks like your response is just the raw response. If you're using fetch, this is what the promise chain should look like:
fetch(fromMySource).then(resp => resp.json()).then(data => doSomething(data));
It looks like you might be trying to use resp directly which would make your data array look like the response object you posted in your question.
Solution 3:
You can use default value of data, when response is pending. In this time data is not defined
const { data = [] } = this.props;
Or use condition in jsx:
render() {
if (!data || !data.length) returnnull;
...
}
Solution 4:
Just add these words to your map function, Because you need check if the array was existed then execute map function
const { data } = this.props;
return (
<div >
{data && data.length && data.map((item, index) =>
<divkey={index}className="row"><spandata = {data } className="number col-4 col-md-8">{item._id}</span><spandata = {data } className="date col-4 col-md-2">{item.date}</span><spandata = {data } className="tag col-4 col-md-2">{item.tag}</span><divclassName="col-md-12 ">
{item.text}
</div></div>
)}
</div>
)
}
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