CODEWITHSUNDEEP
javascriptreactjs
chk.buddi
chk.buddi

Reputation: 603

Geting key value of the dropdown list in reactjs

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

Upvotes: 1

Views: 5614

Answers (1)

Tholle
Tholle

Reputation: 112797

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>

Upvotes: 2

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