提交后,如何使输入字段中的文本显示在屏幕上?

时间:2019-07-25 02:34:22

标签: javascript reactjs forms onsubmit

我想接受输入字段中输入的内容,并在用户单击“提交”后将其显示在屏幕上。我知道这似乎很基础,但是我是React的新手。提前谢谢!

import React, { Component } from 'react';


class TextInput extends Component {
  constructor(props){
    super(props);
    this.state = { info: "", showName: false };
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(evt) {
    evt.preventDefault();
    this.setState({ info: evt.target.value })
  }

  handleSubmit(evt){
    evt.preventDefault();
  }

  render() {
    return (
      <div>
        <form onSubmit={this.handleSubmit}>
          <input
            type="text"
            value={this.state.info}
            onChange={this.handleChange}/>

          <button>Submit</button>
        </form>

      //text from input appears here
      </div>
    );
  }

}

export default TextInput;

2 个答案:

答案 0 :(得分:2)

如果我的理解正确,您只想在用户单击提交后显示文本。在这种情况下,您可以使用handleSubmit在状态submittedInfo中设置一个特殊值,然后显示该值。

import React, { Component } from 'react';


class TextInput extends Component {
  constructor(props){
    super(props);
    this.state = { info: "", submittedInfo: "", showName: false };
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(evt) {
    evt.preventDefault();
    this.setState({ info: evt.target.value })
  }

  handleSubmit(evt){
    evt.preventDefault();
    this.setState({submittedInfo: this.state.info})
  }

  render() {
    return (
      <div>
        <form onSubmit={this.handleSubmit}>
          <input
            type="text"
            value={this.state.info}
            onChange={this.handleChange}/>

          <button>Submit</button>
        </form>

        //text from input appears here
        <div>{this.state.submittedInfo}</div>
      </div>
    );
  }

}

export default TextInput;

另一种方法可能是将布尔值isSubmitted存储在状态中,指示用户是否已提交表单,然后如果this.state.info为{{1},则显示isSubmitted }

答案 1 :(得分:0)

您已经具有类似状态

this.state = { info: "", showName: false };

您可以使用showName状态显示文本,

return (
      <div>
        <form onSubmit={this.handleSubmit}>
          <input
            type="text"
            value={this.state.info}
            onChange={this.handleChange}/>

          <button>Submit</button>
        </form>

        //text from input appears here
        {this.state.showName && <div>{this.state.info}</div>}

      </div>
    );

您的handleSubmit函数应该是

handleSubmit(evt){
    evt.preventDefault();
    this.setState({showName:true})
}