CODEWITHSUNDEEP
javascriptreactjsreact-select
Noob
Noob

Reputation: 156

React select npm onBlur function returns An error

Hi everyone I am having an issue with the react-select onBlur function, I did a lot of research and looked into relevant git issues but still couldn't find an answer. OnBlur function does not get the selected values, the value in onBlur is shown undefined. if the answer available please suggest me. Thanks for the help

Codesanbox Link for reference:

Edit strange-sun-uojxs

import React, { useState } from "react";
import Select from "react-select";
import "./styles.css";

export default function App() {
  const [value, setValue] = useState();
  const options = [
    {
      label: "first option",
      value: 1
    },
    {
      label: "second option",
      value: 2
    },
    {
      label: "third option",
      value: 3
    }
  ];

  const onSelect = (value) => {
    setValue(value);
  };
  const onBlurValue = (value) => {
    console.log(value);
  };

  return (
    <div>
      <Select
        value={options.label}
        options={options}
        onChange={onSelect}
        blurInputOnSelect
        onBlur={onBlurValue}
      />
    </div>
  );
}

Upvotes: 5

Views: 1547

Answers (4)

Olivier Boiss&#233;
Olivier Boiss&#233;

Reputation: 18143

You can add an instance variable to store the selected value (maybe not the best solution but it should work)

export default function App() {
  const [value, setValue] = useState();
  const valueRef = useRef();  

  const onSelect = value => {
    valueRef.current = value;
    setValue(value);
  };

  const onBlurValue = () => {
    console.log(valueRef.current);
  };

  return (
    <div>
      <Select
        value={value}
        options={options}
        onChange={onSelect}
        blurInputOnSelect
        onBlur={onBlurValue}
      />
    </div>
  );
}

The problem with this solution is that you store the selected value in two places (the state variable and the reference instance variable).

The question is, why do you need the get the selected value inside the onBlur handler ? The onChange handler might be sufficient in your case, isn't it ?

Upvotes: 1

Alex Kogan
Alex Kogan

Reputation: 76

Consider this code (check out the comments):

import React, { useState } from "react";
import Select from "react-select";
import "./styles.css";

export default function App() {  
  const [value, setValue] = useState();
  const options = [
    {
      label: "first option",
      value: 1
    },
    {
      label: "second option",
      value: 2
    },
    {
      label: "third option",
      value: 3
    }
  ];

  // destructuring the object to get 'value' property
  // (the passed object looks like { label, value } )
  const onSelect = ({value}) => {
    // here the 'value' variable is being set
    console.debug("selected value:", value )
    setValue(value);
  };

  // destructuring event object to get 'target' property
  const onBlurValue = ({target}) => {
    console.log("onBlur target value:", target.value);
    // the value is not updated yet, so it holds the previously set value
    console.log("onBlur value:", value || "undefined");
  };

  return (
    <div>
      Current value is: {value || "undefined" }
      <Select
        // the value prop does nothing here
        // value={options.label}
        options={options}
        onChange={onSelect}
        blurInputOnSelect
        onBlur={onBlurValue}
      />
    </div>
  );
}

Edit relaxed-ellis-y1z2d

As @a.mola said - the setValue hook is asynchronous, and the value variable isn't updated yet when the onBlur event fires, so it holds the previously set value.

I'm not sure about what are you trying to achieve within the onBlur event, it may not be the right place to do it.

If you need to output the value somehow - you can do so within the return part (as is done in code above).

If you need to validate the value or do something based on its newly selected value - you can do so within the onSelect function.

Upvotes: 1

a.mola
a.mola

Reputation: 4011

The prop blurInputOnSelect you pass to the Select component, removes focus from the Component after the value has changed and since useState and setState are asynchronous, the value isn't updated immediately. That is why the value logged to the console is undefined.

The solution will be to remove the blurInputOnSelect prop from the Select component

Edit bitter-sun-s81se

Upvotes: 0

Ryan Le
Ryan Le

Reputation: 8412

That might be a problem with React of that version, or conflicting between react-select and that specific version of react

Try to upgrade both react and react-dom to the latest version (17.0.2) and react-select to 4.3.1 solve the issue.

Working Example:

Edit distracted-wright-cp0ws

Upvotes: 0

Related Questions