React: Mixing javascript with jsx

Question

I have a simple method which returns jsx that looks as follows:

renderNewsItems = newsItems => {
    return(
        newsItems.map(newsItem => 
        <NewsItem title={newsItem.title} imageUrl={newsItem.imageUrl} />)
    );
  }

and this works fine however when I try to add markup to layout the individual <NewsItem /> components, I'm struggling to figure out how to get it to work. My current, broken attempt looks as follows:

renderNewsItems = newsItems => {
    return(
        <div className="row">
            newsItems.map(newsItem => 
            <div className="col-4">
                <NewsItem title={newsItem.title} imageUrl={newsItem.imageUrl} />
            </div>
        </div>
    );
  }

which results in the error:

'newsItem' is not defined no-undef

In case it's not clear, I'm trying to use the bootstrap grid system to set the layout for how my individual <NewsItem/> components should be rendered

You're not returning anything when mapping...

SakoBu
– SakoBu

2019-02-19 19:57:19 +00:00
Commented Feb 19, 2019 at 19:57 — SakoBu
– SakoBu, Commented Feb 19, 2019 at 19:57

Arup Rakshit · Accepted Answer · 2019-02-19 19:49:41Z

3

You were close. Write it:

renderNewsItems = newsItems => {
  return (
    <div className="row">
      {newsItems.map(newsItem => (
        <div className="col-4">
          <NewsItem
            key={newsItem.id}
            title={newsItem.title}
            imageUrl={newsItem.imageUrl}
          />
        </div>
      ))}
    </div>
  );
};

Note: I assume you have id property on newsItem. If you don't have, you can use title too as key value, until they are uniq across the all the array elements.

answered Feb 19, 2019 at 19:49

Arup Rakshit

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