FormData에 배열을 추가하고 AJAX를 통해 전송

FormData에 배열을 추가하고 AJAX를 통해 전송

---

ajax를 사용하여 배열, 텍스트 필드 및 파일이있는 다중 부분 양식을 제출하고 있습니다.

각 VAR을 기본 데이터에 추가합니다.

var attachments = document.getElementById('files'); 
var data= new FormData();

for (i=0; i< attachments.files.length; i++){
    data.append('file', attachments.files[i]);
    console.log(attachments.files[i]);

    data.append ('headline', headline);
    data.append ('article', article);
    data.append ('arr', arr);
    data.append ('tag', tag);

그런 다음 ajax 함수를 사용하여 PHP 파일로 보내 SQL DB에 저장합니다.

$.ajax({    
    type: "post",
    url: 'php/submittionform.php',
    cache: false,
    processData: false,
    contentType: false,
    data: data,
    success: function(request) {$('#box').html(request); }
})

그러나 PHP 측에서는 arr배열 인 변수가 문자열로 나타납니다.

폼 데이터로 ajax를 사용하지 않고 간단한 $.POST옵션을 사용 하면 PHP 측에서 배열로 가져 오지만 파일도 보낼 수 없습니다.

어떤 해결책?

---

몇 가지 옵션이 있습니다.

JSON 문자열로 변환 한 다음 PHP에서 구문 분석 (권장)

JS

var json_arr = JSON.stringify(arr);

PHP

$arr = json_decode($_POST['arr']);

---

또는 @Curios의 방법을 사용하십시오.

비아 어레이를 전송 FormData.

---

권장하지 않음 : 데이터를 직렬화 한 다음 PHP에서 역 직렬화

JS

// Use <#> or any other delimiter you want
var serial_arr = arr.join("<#>"); 

PHP

$arr = explode("<#>", $_POST['arr']);

---

FormData다음과 같은 방법으로 배열을 보낼 수도 있습니다 .

var formData = new FormData;
var arr = ['this', 'is', 'an', 'array'];
for (var i = 0; i < arr.length; i++) {
    formData.append('arr[]', arr[i]);
}

So you can write arr[] the same way as you do it with a simple HTML form. In case of PHP it should work.

You may find this article useful: How to pass an array within a query string?

---

This is an old question but I ran into this problem with posting objects along with files recently. I needed to be able to post an object, with child properties that were objects and arrays as well.

The function below will walk through an object and create the correct formData object.

// formData - instance of FormData object
// data - object to post
function getFormData(formData, data, previousKey) {
  if (data instanceof Object) {
    Object.keys(data).forEach(key => {
      const value = data[key];
      if (value instanceof Object && !Array.isArray(value)) {
        return this.getFormData(formData, value, key);
      }
      if (previousKey) {
        key = `${previousKey}[${key}]`;
      }
      if (Array.isArray(value)) {
        value.forEach(val => {
          formData.append(`${key}[]`, val);
        });
      } else {
        formData.append(key, value);
      }
    });
  }
}

This will convert the following json -

{
  name: 'starwars',
  year: 1977,
  characters: {
    good: ['luke', 'leia'],
    bad: ['vader'],
  },
}

into the following FormData

 name, starwars
 year, 1977
 characters[good][], luke
 characters[good][], leia
 characters[bad][], vader

---

Typescript version:

export class Utility {      
    public static convertModelToFormData(model: any, form: FormData = null, namespace = ''): FormData {
        let formData = form || new FormData();
        let formKey;

        for (let propertyName in model) {
            if (!model.hasOwnProperty(propertyName) || !model[propertyName]) continue;
            let formKey = namespace ? `${namespace}[${propertyName}]` : propertyName;
            if (model[propertyName] instanceof Date)
                formData.append(formKey, model[propertyName].toISOString());
            else if (model[propertyName] instanceof Array) {
                model[propertyName].forEach((element, index) => {
                    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;
    }
}

Using:

let formData = Utility.convertModelToFormData(model);

---

If you have nested objects and arrays, best way to populate FormData object is using recursion.

function createFormData(formData, data, key) {
    if ( ( typeof data === 'object' && data !== null ) || Array.isArray(data) ) {
        for ( let i in data ) {
            if ( ( typeof data[i] === 'object' && data[i] !== null ) || Array.isArray(data[i]) ) {
                createFormData(formData, data[i], key + '[' + i + ']');
            } else {
                formData.append(key + '[' + i + ']', data[i]);
            }
        }
    } else {
        formData.append(key, data);
    }
}

---

add all type inputs to FormData

const formData = new FormData();
for (let key in form) {
    Array.isArray(form[key])
        ? form[key].forEach(value => formData.append(key + '[]', value))
        : formData.append(key, form[key]) ;
}

---

Based on @YackY answer shorter recursion version:

function createFormData(formData, key, data) {
    if (data === Object(data) || Array.isArray(data)) {
        for (var i in data) {
            createFormData(formData, key + '[' + i + ']', data[i]);
        }
    } else {
        formData.append(key, data);
    }
}

Usage example:

var data = {a: '1', b: 2, c: {d: '3'}};
var formData = new FormData();
createFormData(formData, 'data', data);

Sent data:

data[a]=1&
data[b]=2&
data[c][d]=3

---

Next version valid for model containing arays of simple values:

function convertModelToFormData(val, formData = new FormData(), namespace = '') {
    if((typeof val !== 'undefined') && (val !== null)) {
        if(val instanceof Date) {
            formData.append(namespace, val.toISOString());
        } else if(val instanceof Array) {
            for(let element of val) {
                convertModelToFormData(element, formData, namespace + '[]');
            }
        } else if(typeof val === 'object' && !(val instanceof File)) {
            for (let propertyName in val) {
                if(val.hasOwnProperty(propertyName)) {
                    convertModelToFormData(val[propertyName], formData, namespace ? namespace + '[' + propertyName + ']' : propertyName);
                }
            }
        } else {
            formData.append(namespace, val.toString());
        }
    }
    return formData;
}

참고URL : https://stackoverflow.com/questions/16104078/appending-array-to-formdata-and-send-via-ajax