CODEWITHSUNDEEP
javascriptreactjsnestedonbluronfocus
dmigo
dmigo

Reputation: 3029

How to implement onBlur/onFocus for a div with nested input fields?

There is a <div> and a couple of nested <input>s. onBlur fires every time user clicks on one of the <input>s.
This is a bit frustrating that onBlur happens when I hit something inside the div. After an hour of searching I still wasn't able to find any good solution.
This sample of code shows what I'm talking about:

class Thing extends React.Component {
  handleBlur(e) {
    console.log('blur');
  }
  handleFocus(e) {
    console.log('focus');
  }
  render() {
    return (
      <div onFocus={this.handleFocus} onBlur={this.handleBlur} tabIndex="1">
        <div>
          <input type="text" value="Hello," />
        </div>
        <div>
          <input type="text" value="Thing" />
        </div>
      </div>
    );
  }
}

You may play around with the code over here.
However my ultimate goal is to make this thing working properly.

Upvotes: 4

Views: 16256

Answers (4)

Dawson Booth
Dawson Booth

Reputation: 58

Just adding on to this with what I think is the best solution these days.

This ignores blur events by using the Node.contains method to check whether the element is a descendant of that which is already focused.

handleBlur({ currentTarget, relatedTarget }) {
   if (currentTarget.contains(relatedTarget)) return;

   /* otherwise normal actions to perform on blur */

   console.log('blur');
}
handleFocus(e) {
   console.log('focus');
}

Upvotes: 3

jfunk
jfunk

Reputation: 8162

This is from OP comments above, he found the following solution which worked for him (and now me) and posted it in a comment. I am reposting it here for anyone else who might not think to dig through comments.

Basically, I just check on every blur event if e.relativeTarget has e.currentTarget anywhere in the parentElement chain.

https://codesandbox.io/s/vo2opP0Nn?file=/index.js

Upvotes: 1

kind user
kind user

Reputation: 41893

How about splitting the inputs into a single, independent component?

app.js

class Thing extends React.Component {
  handleBlur(val, event) {
    console.log(val, event);
  }
  handleFocus(val, event) {
    console.log(val, event);
  }

  data = ['Hello, ', 'Thing'];

  render() {
    return (
      <div tabIndex="1">
        {this.data.map((v, i) => <Input value={v} key={i} onFocus={this.handleFocus} onBlur={this.handleBlur} />)}
      </div>
    );
  }
}

Input.js

import React from 'react';

export class Input extends React.PureComponent {

  handleF = () => {
    this.props.onFocus(this.props.value, 'focus');
  }

  handleB = () => {
    this.props.onBlur(this.props.value, 'blur');
  }

  render() {
    return <input type="text" onFocus={this.handleF} onBlur={this.handleB} />;
  }
}

export default Input;

https://codesandbox.io/s/J6o5Ey9Jg

Upvotes: 1

qiAlex
qiAlex

Reputation: 4346

You may want to ignore extra blur events.

handleBlur(e) {
   if (e.target.tagName == "INPUT") {
      return;
   }
   console.log('blur');
}
handleFocus(e) {
   console.log('focus');
}

Upvotes: 3

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