Answers for "refs react js"

TypeScript

refs react js

class Lesson9Refs extends Component {

    onAddProduct = () => {
        alert(this.refs.productname.value);
    }
    
    
    return (

            <div>

                <div className="container">
                    <div class="card mt-10">
                        <div class="card-header">
                            Featured
                        </div>
                        <div class="card-body">
                          
                            <label> Product Name: </label>
                            <input type='text' className="form-control" ref="productname" />  

                            <button type="submit" className="btn btn-primary" onClick={ this.onAddProduct } >
                                Add Product
                            </button>

                        </div>
                    </div>
                    <div className="row mt-10">
                        { elements }
                    </div>
                </div>
            </div>
        );

    }
}

export default Lesson9Refs;

Posted by: Guest on November-03-2020

cre&atRefs react js

const node = this.myRef.current;

Posted by: Guest on June-07-2020

Source

when to use react ref

WHEN TO USE REACT'S REF ATTRIBUTE?
But it is not always a good idea to use the ref attribute. The general rule of thumb is to avoid it. The official React documentation mentions three occasions where you can use it because you have no other choice.

Managing focus, text selection, or media playback.
Integrating with third-party DOM libraries.
Triggering imperative animations.

Posted by: Guest on June-25-2020

Source

-1

use ref in component reactjs

class CustomTextInput extends React.Component {
  constructor(props) {
    super(props);

    this.textInput = null;
    this.setTextInputRef = element => {      this.textInput = element;    };
    this.focusTextInput = () => {      // Donne le focus au champ texte en utilisant l’API DOM native.      if (this.textInput) this.textInput.focus();    };  }

  componentDidMount() {
    // Focus automatique sur le champ au montage
    this.focusTextInput();  }

  render() {
    // Utilise la fonction de rappel `ref` pour stocker une référence à l’élément
    // DOM du champ texte dans une propriété d’instance (ex. this.textInput)
    return (
      <div>
        <input
          type="text"
          ref={this.setTextInputRef}        />
        <input
          type="button"
          value="Donner le focus au champ texte"
          onClick={this.focusTextInput}        />
      </div>
    );
  }
}

Posted by: Guest on March-02-2021

Source

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