如何在Submit函数上的React.js中将表单值作为FormData传递 [英] How to pass form values as FormData in reactjs on submit function

问题描述

我有一个使用json数据生成的动态表单，我需要在提交时传递表单输入值.我打算将值作为formdata发送.我已经创建了Submit函数，但是我不知道如何在formdata中附加值，并且需要使用Axios通过post方法.我是新来的反应者，谁能告诉我该怎么做.下面是我的代码.

I have a dynamic form generated using json data and I need to pass the form input values on submit. I'm planning to send the values as formdata. I have created submit function but i dont know how to append the values in formdata and need to pass through post method using Axios. Im new to react can anyone tell me how to do this. Below is my code.

var DATA = {
  "indexList": [{
    "Label": "Name",
    "Type": "text",
    "Regex": "",
    "Default_Val": "",
    "Values": {
      "Key": "",
      "Value": ""
    },
    "Validtion Msg": "",
    "Script": "",
    "Mandatory": "Y",
    "maxLength":"16",
    "minLength":"7",
    "format":"Alphanumeric",
    "cssClassName": "form-control",
    "Placeholder": ""
  },
  {
    "Label": "Select Language",
    "Type": "dropdown",
    "Regex": "",
    "Default_Val": "English",
    "Values": [{
      "Key": "option1",
      "Value": "English"
    },{
      "Key": "option2",
      "Value": "Spanish"
    }],
    "Validtion Msg": "",
    "Script": "",
    "Mandatory": "Y",
    "maxLength":"",
    "minLength":"",
    "format":"",
    "cssClassName": "form-control",
    "Placeholder": ""
  },

  {
    "Label": "Type",
    "Type": "radio",
    "Regex": "",
    "Default_Val": "",
    "Values": [{
      "Key": "option1",
      "Value": "Form1"
    }, {
      "Key": "option2",
      "Value": "Form2"
    }, {
      "Key": "option3",
      "Value": "Form3"
    },{
      "Key": "option4",
      "Value": "Form4"
    },{
      "Key": "option5",
      "Value": "Form5"
    }],
    "Validtion Msg": "",
    "Script": "",
    "Mandatory": "Y",
    "maxLength":"",
    "minLength":"",
    "format":"",
    "cssClassName": "form-control",
    "Placeholder": ""
  }
  ]
};

var Menu = React.createClass({

  getInitialState() {
    return {

    }
  },

  _renderElement: function(group){
    switch(group.Type){
      case 'text':
      return <input className={group.cssClassName} 
      id={group.Label} 
      placeholder={group.Placeholder}
      required={group.Mandatory == 'Y'? true:   false}/>

      case 'dropdown':
      return <select className={group.cssClassName}>
      <option value="">{group.Placeholder} </option>
      {group.Values.map(el => <option>{el.Value}</option>)}
      </select>


      case 'radio':
      return <div className={group.Type}>
      <div for="let value of group.Values">
      {group.Values.map(el=> <label><input
        name="radios"/>{el.Value}</label>)}
      </div>
      </div>
    }
  },

  renderForm: function () {

    var data = DATA.indexList;
    return data.map(group =>{
      return <div>
      <label for={group.Label}>{group.Label}</label>
      <div>
      {
       this._renderElement(group)
     }
     </div>
     </div>
   });
  },


    _onSubmit: function () {
    let formData = new FormData();
    var data1 = DATA.indexList;
    data1.map(group =>{
        formData.append(group.Label,);//How to get the input value here as a second parameter, so than i can pass the label name and corresponding value to form data.
    });

    const config = {     
        headers: { 'content-type': 'multipart/form-data' }
    }

    Axios.post('',formData, config)
        .then(response => {
                console.log(response);
        })
        .catch(error => {
            console.log(error);
        });

  },

  render: function() {
    return (    
      <div className="container">
      <br/>
      <div className="panel panel-primary">
      <div className="panel-heading">Form</div>
      <div className="panel-body">
      <form>
      <div className="form-group">
      <div className="col-xs-5">


      {this.renderForm()}
      <button type="submit" className="btn btn-primary" onSubmit={this._onSubmit()}>Submit</button>
      </div>
      </div>
      </form>
      </div>      
      </div>
      </div>
      )}
  });

ReactDOM.render(<Menu/>, document.getElementById('app'))

推荐答案

要使用axios发布FormData，您需要在header中指定要发送的FormData，因为content-type应该是multipart/form-data.

To post the FormData using axios, you need specify in header that you are sending FormData, for that content-type should be multipart/form-data.

选中此项，如何将FormData与axios一起使用:

Check this, how to use FormData with axios:

let formData = new FormData();    //formdata object

formData.append('name', 'ABC');   //append the values with key, value pair
formData.append('age', 20);

const config = {     
    headers: { 'content-type': 'multipart/form-data' }
}

axios.post(url, formData, config)
    .then(response => {
        console.log(response);
    })
    .catch(error => {
        console.log(error);
    });

这篇关于如何在Submit函数上的React.js中将表单值作为FormData传递的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！