Geting key value of the dropdown list in reactjs

Question

I'm trying to get the 'key' value of my dynamic dropdown list as follows:

searchSubmit(e){    
  const s = e.target.value;
  alert(s);
}

my dropdown list is as follows:

<select
  className="textboxstyle"
  onChange={this.searchSubmit}
>
  <option key='-1'>Select Brand</option>
  <option key='0'>ALL</option>
  {optionItems}
</select>

And my dynamic drop-down is populated as follows,

let brands = this.state.brands;
let optionItems = brands.map((brand) =>
  <option key={brand.id}>{brand.name}</option>
);

But when I select option, alert display the name of the selected value, not the key. How to get the 'key' value? Thanks

Tholle · Accepted Answer · 2018-11-15 17:04:06Z

2

The key prop is used by React to differentiate between all the elements in an array. If you want value to be the id of the brand, you can use it as value as well as key.

Example

class App extends React.Component {
  state = {
    brands: [{ id: 1, name: "Foo" }, { id: 2, name: "Bar" }]
  };

  searchSubmit = e => {
    const { value } = e.target;
    alert(value);
  };

  render() {
    const { brands } = this.state;

    return (
      <select onChange={this.searchSubmit}>
        <option value="-1">Select Brand</option>
        <option value="0">ALL</option>
        {brands.map(brand => (
          <option value={brand.id} key={brand.id}>
            {brand.name}
          </option>
        ))}
      </select>
    );
  }
}

ReactDOM.render(<App />, document.getElementById("root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id="root"></div>

answered Nov 15, 2018 at 17:04

Tholle

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1 Comment

Alexandra Over a year ago

and how do I get the 2 values brand.key and brand.name?

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