将JS对象转换为表单数据

Question

如何将我的JS对象转换为FormData？

我想要这样做的原因是，我有一个我用~100表单字段值构造的对象。

var item = {
   description: 'Some Item',
   price : '0.00',
   srate : '0.00',
   color : 'red',
   ...
   ...
}

现在我被要求将上传文件功能添加到我的表单中，当然不可能通过JSON，所以我打算转到FormData。那么有什么方法可以将我的JS对象转换为FormData？

Answer 1

如果您有一个对象，则可以轻松创建FormData对象，并将该对象的名称和值附加到formData。

您尚未发布任何代码，因此这是一般示例;

var form_data = new FormData();

for ( var key in item ) {
    form_data.append(key, item[key]);
}

$.ajax({
    url         : 'http://example.com/upload.php',
    data        : form_data,
    processData : false,
    contentType : false,
    type: 'POST'
}).done(function(data){
    // do stuff
});

MDN

上的文档中有更多示例

Answer 2

使用ES6和更多功能编程方法@ adeneo的答案可能如下所示：

function getFormData(object) {
    const formData = new FormData();
    Object.keys(object).forEach(key => formData.append(key, object[key]));
    return formData;
}

或者使用.reduce()和箭头功能：

getFormData = object => Object.keys(object).reduce((formData, key) => {
    formData.append(key, object[key]);
    return formData;
}, new FormData());

Answer 3

此函数将对象的所有数据添加到FormData

来自@ developer033的ES6版本：

function buildFormData(formData, data, parentKey) {
  if (data && typeof data === 'object' && !(data instanceof Date) && !(data instanceof File)) {
    Object.keys(data).forEach(key => {
      buildFormData(formData, data[key], parentKey ? `${parentKey}[${key}]` : key);
    });
  } else {
    const value = data == null ? '' : data;

    formData.append(parentKey, value);
  }
}

function jsonToFormData(data) {
  const formData = new FormData();

  buildFormData(formData, data);

  return formData;
}

const my_data = {
  num: 1,
  falseBool: false,
  trueBool: true,
  empty: '',
  und: undefined,
  nullable: null,
  date: new Date(),
  name: 'str',
  another_object: {
    name: 'my_name',
    value: 'whatever'
  },
  array: [
    {
      key1: {
        name: 'key1'
      }
    }
  ]
};

jsonToFormData(my_data)

jQuery版本：

function appendFormdata(FormData, data, name){
    name = name || '';
    if (typeof data === 'object'){
        $.each(data, function(index, value){
            if (name == ''){
                appendFormdata(FormData, value, index);
            } else {
                appendFormdata(FormData, value, name + '['+index+']');
            }
        })
    } else {
        FormData.append(name, data);
    }
}


var formData = new FormData(),
    your_object = {
        name: 'test object',
        another_object: {
            name: 'and other objects',
            value: 'whatever'
        }
    };
appendFormdata(formData, your_object);

Answer 4

我有一个场景，在构建表单数据时，嵌套JSON必须以线性方式序列化，因为这是服务器期望值的方式。所以，我写了一个小的递归函数来转换JSON，就像这样：

{
   "orderPrice":"11",
   "cardNumber":"************1234",
   "id":"8796191359018",
   "accountHolderName":"Raj Pawan",
   "expiryMonth":"02",
   "expiryYear":"2019",
   "issueNumber":null,
   "billingAddress":{
      "city":"Wonderland",
      "code":"8796682911767",
      "firstname":"Raj Pawan",
      "lastname":"Gumdal",
      "line1":"Addr Line 1",
      "line2":null,
      "state":"US-AS",
      "region":{
         "isocode":"US-AS"
      },
      "zip":"76767-6776"
   }
}

这样的事情：

{
   "orderPrice":"11",
   "cardNumber":"************1234",
   "id":"8796191359018",
   "accountHolderName":"Raj Pawan",
   "expiryMonth":"02",
   "expiryYear":"2019",
   "issueNumber":null,
   "billingAddress.city":"Wonderland",
   "billingAddress.code":"8796682911767",
   "billingAddress.firstname":"Raj Pawan",
   "billingAddress.lastname":"Gumdal",
   "billingAddress.line1":"Addr Line 1",
   "billingAddress.line2":null,
   "billingAddress.state":"US-AS",
   "billingAddress.region.isocode":"US-AS",
   "billingAddress.zip":"76767-6776"
}

服务器将接受采用此转换格式的表单数据。

这是功能：

function jsonToFormData (inJSON, inTestJSON, inFormData, parentKey) {
    // http://stackoverflow.com/a/22783314/260665
    // Raj: Converts any nested JSON to formData.
    var form_data = inFormData || new FormData();
    var testJSON = inTestJSON || {};
    for ( var key in inJSON ) {
        // 1. If it is a recursion, then key has to be constructed like "parent.child" where parent JSON contains a child JSON
        // 2. Perform append data only if the value for key is not a JSON, recurse otherwise!
        var constructedKey = key;
        if (parentKey) {
            constructedKey = parentKey + "." + key;
        }

        var value = inJSON[key];
        if (value && value.constructor === {}.constructor) {
            // This is a JSON, we now need to recurse!
            jsonToFormData (value, testJSON, form_data, constructedKey);
        } else {
            form_data.append(constructedKey, inJSON[key]);
            testJSON[constructedKey] = inJSON[key];
        }
    }
    return form_data;
}

调用：

        var testJSON = {};
        var form_data = jsonToFormData (jsonForPost, testJSON);

我正在使用testJSON来查看转换后的结果，因为我无法提取form_data的内容。 AJAX发布电话：

        $.ajax({
            type: "POST",
            url: somePostURL,
            data: form_data,
            processData : false,
            contentType : false,
            success: function (data) {
            },
            error: function (e) {
            }
        });

Answer 5

其他答案对我来说不完整。我从@Vladimir Novopashin回答并修改了它。以下是我需要的东西以及我发现的错误：

• 支持文件
• 支持数组
• 错误：需要使用.prop而不是[prop]添加复杂对象内的文件。例如，formData.append('photos[0][file]', file)在谷歌浏览器上不起作用 formData.append('photos[0].file', file)工作
• 忽略对象中的某些属性

以下代码适用于IE11和常绿浏览器。

function objectToFormData(obj, rootName, ignoreList) {
    var formData = new FormData();

    function appendFormData(data, root) {
        if (!ignore(root)) {
            root = root || '';
            if (data instanceof File) {
                formData.append(root, data);
            } else if (Array.isArray(data)) {
                for (var i = 0; i < data.length; i++) {
                    appendFormData(data[i], root + '[' + i + ']');
                }
            } else if (typeof data === 'object' && data) {
                for (var key in data) {
                    if (data.hasOwnProperty(key)) {
                        if (root === '') {
                            appendFormData(data[key], key);
                        } else {
                            appendFormData(data[key], root + '.' + key);
                        }
                    }
                }
            } else {
                if (data !== null && typeof data !== 'undefined') {
                    formData.append(root, data);
                }
            }
        }
    }

    function ignore(root){
        return Array.isArray(ignoreList)
            && ignoreList.some(function(x) { return x === root; });
    }

    appendFormData(obj, rootName);

    return formData;
}

Answer 6

对于迟到的回答感到抱歉，但由于Angular 2目前不支持文件上传，我一直在努力解决这个问题。因此，执行此操作的方法是发送XMLHttpRequest FormData。所以，我创建了一个功能来完成它。我正在使用 Typescript 。要将其转换为 Javascript ，只需删除数据类型声明。

/**
     * Transforms the json data into form data.
     *
     * Example:
     *
     * Input:
     * 
     * fd = new FormData();
     * dob = {
     *  name: 'phone',
     *  photos: ['myphoto.jpg', 'myotherphoto.png'],
     *  price: '615.99',
     *  color: {
     *      front: 'red',
     *      back: 'blue'
     *  },
     *  buttons: ['power', 'volup', 'voldown'],
     *  cameras: [{
     *      name: 'front',
     *      res: '5Mpx'
     *  },{
     *      name: 'back',
     *      res: '10Mpx'
     *  }]
     * };
     * Say we want to replace 'myotherphoto.png'. We'll have this 'fob'.
     * fob = {
     *  photos: [null, <File object>]
     * };
     * Say we want to wrap the object (Rails way):
     * p = 'product';
     *
     * Output:
     *
     * 'fd' object updated. Now it will have these key-values "<key>, <value>":
     *
     * product[name], phone
     * product[photos][], myphoto.jpg
     * product[photos][], <File object>
     * product[color][front], red
     * product[color][back], blue
     * product[buttons][], power
     * product[buttons][], volup
     * product[buttons][], voldown
     * product[cameras][][name], front
     * product[cameras][][res], 5Mpx
     * product[cameras][][name], back
     * product[cameras][][res], 10Mpx
     * 
     * @param {FormData}  fd  FormData object where items will be appended to.
     * @param {Object}    dob Data object where items will be read from.
     * @param {Object =   null} fob File object where items will override dob's.
     * @param {string =   ''} p Prefix. Useful for wrapping objects and necessary for internal use (as this is a recursive method).
     */
    append(fd: FormData, dob: Object, fob: Object = null, p: string = ''){
        let apnd = this.append;

        function isObj(dob, fob, p){
            if(typeof dob == "object"){
                if(!!dob && dob.constructor === Array){
                    p += '[]';
                    for(let i = 0; i < dob.length; i++){
                        let aux_fob = !!fob ? fob[i] : fob;
                        isObj(dob[i], aux_fob, p);
                    }
                } else {
                    apnd(fd, dob, fob, p);
                }
            } else {
                let value = !!fob ? fob : dob;
                fd.append(p, value);
            }
        }

        for(let prop in dob){
            let aux_p = p == '' ? prop : `${p}[${prop}]`;
            let aux_fob = !!fob ? fob[prop] : fob;
            isObj(dob[prop], aux_fob, aux_p);
        }
    }

Answer 7

尝试如下JSON.stringify函数

var postData = JSON.stringify(item);
var formData = new FormData();
formData.append("postData",postData );

Answer 8

递归

const toFormData = (f => f(f))(h => f => f(x => h(h)(f)(x)))(f => fd => pk => d => {
  if (d instanceof Object) {
    Object.keys(d).forEach(k => {
      const v = d[k]
      if (pk) k = `${pk}[${k}]`
      if (v instanceof Object && !(v instanceof Date) && !(v instanceof File)) {
        return f(fd)(k)(v)
      } else {
        fd.append(k, v)
      }
    })
  }
  return fd
})(new FormData())()

let data = {
  name: 'John',
  age: 30,
  colors: ['red', 'green', 'blue'],
  children: [
    { name: 'Max', age: 3 },
    { name: 'Madonna', age: 10 }
  ]
}
console.log('data', data)
document.getElementById("data").insertAdjacentHTML('beforeend', JSON.stringify(data))

let formData = toFormData(data)

for (let key of formData.keys()) {
  console.log(key, formData.getAll(key).join(','))
  document.getElementById("item").insertAdjacentHTML('beforeend', `<li>${key} = ${formData.getAll(key).join(',')}</li>`)
}

<p id="data"></p>
<ul id="item"></ul>

Answer 9

这是使用Object.entries()的简短解决方案，甚至可以处理嵌套的对象。

// If this is the object you want to convert to FormData...
const item = {
    description: 'First item',
    price: 13,
    photo: File
};

const formData = new FormData();

Object.entries(item).forEach(([key, value]) => {
    formData.append(key, value);
});

// At this point, you can then pass formData to your handler method

在此处详细了解有关Object.entries()的信息-https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries

Answer 10

您只需安装qs：

npm i qs

只需导入：

import qs from 'qs'

将对象传递到qs.stringify()：

var item = {
   description: 'Some Item',
   price : '0.00',
   srate : '0.00',
   color : 'red',
   ...
   ...
}

qs.stringify(item)

Answer 11

您可以简单地使用：

formData.append('item', JSON.stringify(item));

Answer 12

• 处理嵌套对象和数组
• 处理文件
• 类型支持
• 在Chrome中测试

const buildFormData = (formData: FormData, data: FormVal, parentKey?: string) => {
    if (isArray(data)) {
        data.forEach((el) => {
            buildFormData(formData, el, parentKey)
        })

    } else if (typeof data === "object" && !(data instanceof File)) {
        Object.keys(data).forEach((key) => {
            buildFormData(formData, (data as FormDataNest)[key], parentKey ? `${parentKey}.${key}` : key)
        })

    } else {
        if (isNil(data)) {
            return
        }

        let value = typeof data === "boolean" || typeof data === "number" ? data.toString() : data
        formData.append(parentKey as string, value)
    }
}

export const getFormData = (data: Record<string, FormDataNest>) => {
    const formData = new FormData()

    buildFormData(formData, data)

    return formData
}

示例和测试

const data = {
    filePhotos: imageArray,
}

yourAjaxCall({
   ...,
   data: getFormData(data)
})

Chrome开发者工具的屏幕截图-网络-标头：

const data = {
    nested: {
        a: 1,
        b: ["hello", "world"],
        c: {
            d: 2,
            e: ["hello", "world"],
        }
    }
}

yourAjaxCall({
   ...,
   data: getFormData(data)
})

Answer 13

也许您正在寻找的是一种代码，该代码可以接收您的javascript对象，并从中创建一个FormData对象，然后使用新的Fetch API将其发布到服务器中：

    let myJsObj = {'someIndex': 'a value'};

    let datos = new FormData();
    for (let i in myJsObj){
        datos.append( i, myJsObj[i] );
    }

    fetch('your.php', {
        method: 'POST',
        body: datos
    }).then(response => response.json())
        .then(objson => {
            console.log('Success:', objson);
        })
        .catch((error) => {
            console.error('Error:', error);
        });

Answer 14

TypeScript版本：

static convertModelToFormData(model: any, form: FormData = null, namespace = ''): FormData {
    let formData = form || new FormData();
    for (let propertyName in model) {
      if (!model.hasOwnProperty(propertyName) || model[propertyName] == undefined) continue;
      let formKey = namespace ? `${namespace}[${propertyName}]` : propertyName;
      if (model[propertyName] instanceof Date) {        
        formData.append(formKey, this.dateTimeToString(model[propertyName]));
      }
      else if (model[propertyName] instanceof Array) {
        model[propertyName].forEach((element, index) => {
          if (typeof element != 'object')
            formData.append(`${formKey}[]`, element);
          else {
            const tempFormKey = `${formKey}[${index}]`;
            this.convertModelToFormData(element, formData, tempFormKey);
          }
        });
      }
      else if (typeof model[propertyName] === 'object' && !(model[propertyName] instanceof File)) {        
        this.convertModelToFormData(model[propertyName], formData, formKey);
      }
      else {        
        formData.append(formKey, model[propertyName].toString());
      }
    }
    return formData;
  }

https://gist.github.com/Mds92/091828ea857cc556db2ca0f991fee9f6

Answer 15

我用它来发布对象数据作为表单数据。

const encodeData = require('querystring');

const object = {type: 'Authorization', username: 'test', password: '123456'};

console.log(object);
console.log(encodeData.stringify(object));

Answer 16

在我的情况下，我的对象还具有属性，即文件数组。由于它们是二进制的，因此应该以不同的方式处理-索引不必是键的一部分。所以我修改了@Vladimir Novopashin和@ developer033的答案：

export function convertToFormData(data, formData, parentKey) {
  if(data === null || data === undefined) return null;

  formData = formData || new FormData();

  if (typeof data === 'object' && !(data instanceof Date) && !(data instanceof File)) {
    Object.keys(data).forEach(key => 
      convertToFormData(data[key], formData, (!parentKey ? key : (data[key] instanceof File ? parentKey : `${parentKey}[${key}]`)))
    );
  } else {
    formData.append(parentKey, data);
  }

  return formData;
}

Answer 17

我从Gudradain's answer中引用了此内容。我以Typescript格式对其进行了一些编辑。

class UtilityService {
    private appendFormData(formData, data, rootName) {

        let root = rootName || '';
        if (data instanceof File) {
            formData.append(root, data);
        } else if (Array.isArray(data)) {
            for (var i = 0; i < data.length; i++) {
                this.appendFormData(formData, data[i], root + '[' + i + ']');
            }
        } else if (typeof data === 'object' && data) {
            for (var key in data) {
                if (data.hasOwnProperty(key)) {
                    if (root === '') {
                        this.appendFormData(formData, data[key], key);
                    } else {
                        this.appendFormData(formData, data[key], root + '.' + key);
                    }
                }
            }
        } else {
            if (data !== null && typeof data !== 'undefined') {
                formData.append(root, data);
            }
        }
    }

    getFormDataFromObj(data) {
        var formData = new FormData();

        this.appendFormData(formData, data, '');

        return formData;
    }
}

export let UtilityMan = new UtilityService();

Answer 18

我可能要晚一点参加聚会，但这就是我将单一对象转换为FormData所创建的。

function formData(formData, filesIgnore = []) {
  let data = new FormData();

  let files = filesIgnore;

  Object.entries(formData).forEach(([key, value]) => {
    if (typeof value === 'object' && !files.includes(key)) {
      data.append(key, JSON.stringify(value) || null);
    } else if (files.includes(key)) {
      data.append(key, value[0] || null);
    } else {
      data.append(key, value || null);
    }
  })

  return data;
}

它如何工作？ 它将转换并使用JSON.stringify将所有您希望在忽略列表中设置的File对象的属性（第二个参数。如果有人可以告诉我一种更好的方法来确定这一点，将有所帮助！）返回到json字符串中。然后在服务器上，您只需要将其转换回JSON对象即可。

示例：

let form = {
  first_name: 'John',
  last_name: 'Doe',
  details: {
    phone_number: 1234 5678 910,
    address: '123 Some Street',
  },
  profile_picture: [object FileList] // set by your form file input. Currently only support 1 file per property.
}

function submit() {
  let data = formData(form, ['profile_picture']);

  axios.post('/url', data).then(res => {
    console.log('object uploaded');
  })
}

我仍然对Http请求和JavaScript还是陌生的，因此我们将不胜感激！

Answer 19

此方法将JS对象转换为FormData：

function convertToFormData(params) {
    return Object.entries(params)
        .reduce((acc, [key, value]) => {
            if (Array.isArray(value)) {
                value.forEach((v, k) => acc.append(`${key}[${k}]`, value));
            } else if (typeof value === 'object' && !(value instanceof File) && !(value instanceof Date)) {
                Object.entries(value).forEach((v, k) => acc.append(`${key}[${k}]`, value));
            } else {
                acc.append(key, value);
            }

            return acc;
        }, new FormData());
}

Answer 20

这很简单：

var item: { some1: "ajbd" , some2: "dds".. }
let myFormData = new FormData();
      
       const abc = item.some1;
       const xyz = item.some2;

          myFormData.append('field1', abc);
          myFormData.append('field2', xyz);
    
    fetch('http:url', {
      method: 'POST',
      headers: {
        'Content-Type': false,
      },
      body: myFormData,
    }).
do promise ..

Answer 21

function toFormData(o) {
  return Object.entries(o).reduce((d,e) => (d.append(...e),d), new FormData())
}

var object = {
  username: 'JohnDoe',
  file: new File(['foo'], 'foo.txt', {type: 'text/plain'})
}

fetch('https://httpbin.org/post', {
  method: 'POST',
  body: toFormData(object)
}).then(r => r.json()).then(console.log)

Answer 22

尝试obj2fd => https://www.npmjs.com/package/obj2fd

import obj2fd from 'obj2fd'

let data = {a:1, b:2, c:{ca:1}};
let dataWithFormData = obj2fd(data);
//result => [a=>1, b=>2, c=>[ca=>1]]