javascript - 单击按钮时添加输入字段

Question

我有一个用于添加配方的表单，其中有配料按钮。一个食谱可以有很多成分。单击该按钮时，用于添加成分的输入字段应出现在成分按钮下方。我试图做的是？

import Input from './Input.jsx';

export default class Sell extends Component {
    constructor()
    {
        super();
        this.state = {
          inputValues : {}
        }
        this.onHandleSubmit =this.onHandleSubmit.bind(this);
    }

    onChange( name, { target : { value } })
    {
         const inputValues = this.state.inputValues;
         inputValues[name] = value;
         this.setState({ inputValues })
    }

    onHandleSubmit()
    {
        console.log('clicked');
        const name = `ingrediant-${Object.keys(this.state.inputValues).length}`;
        let inputbox = <Input name={ name }
                              onChange={ this.onChange.bind(this, name )} />

    }

    onSubmit(event){
        event.preventDefault();
    }

    render() {
        return (
            <div className="row">
                <h2 className="flow-text text-center">Add Recipe</h2>
                <form onSubmit={this.onSubmit} className="col offset-s4 s4">
                  <div className="row">
                    <div className="input-field col s12">
                      <input ref="name" id="name" type="text" className="validate flow-text" />
                      <label htmlFor="name">Name of Recipe</label>
                    </div>
                  </div>
                    <div className="input-field col s12">
                        <a onClick={this.onHandleSubmit} className="waves-effect waves-light btn btn-block"><i className="material-icons right">add</i>Ingredients</a>
                    </div>
                  </div>
                  {this.state.inputValues}
                  <div className="row">
                    <button className="waves-effect waves-light btn btn-block">Submit</button>
                  </div>
                </form>
            </div>
        );
    }
}

如何在单击按钮时为成分创建新的动态(新创建的输入框的不同 ref)输入字段？

Answer 1

在你的情况下，我会让输入成为一个单独的组件，比如

class Input extends Component
{

    render()
    {
      const { name, onChange } = this.props;
      return(<div className="row">
                <div className="input-field col s12">
                  <input id={name} 
                         type="text" 
                         className="validate flow-text" 
                         onChange={ this.props.onChange } />
                  <label htmlFor={name}>Name of Recipe</label>
                </div>
         </div>)
    }

}

并从 Sell 组件传递一个 onChange 回调，Sell 组件将维护输入的值，当你想将值发送到服务器时，你把它放在州里。像这样的东西:

class Sell extends Component
{
    constructor()
    {
        super();
        this.state = {
          inputValues = {},
          inputs : []
        }
    }

    onChange( name, { target : { value } })
    {
         const inputValues = this.state.inputValues;
         inputValues[name] = value;
         this.setState({ inputValues })
    }

    onHandleSubmit()
    {
        const name = `incrediant-${this.state.inputs.length}`;
        let inputbox = <Input name={ name }
                              key={this.state.inputs.length}
                              onChange={ this.onChange.bind(this, name )} />

       const inputs = this.state.inputs;
       inputs.push( inputbox );
       this.setState( { inputs } );

    }

   ...
   ....

   render()
   {
       ...
       ...
       {
           this.state.inputs.map( i => i );
       }
   }

}

在那种情况下你不必保留refs