我怎样才能将我的JS对象转换为FormData?
我这样做的原因是，我有一个用~100个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，当然，通过JSON是不可能的，所以我计划移动到FormData。那么有什么方法可以将我的JS对象转换为FormData呢?
当前回答
该函数将object中的所有数据添加到FormData中
ES6版本来自@developer033:
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'){
$.each(data, function(index, value){
if (name == ''){
appendFormdata(FormData, value, index);
} else {
appendFormdata(FormData, value, name + '['+index+']');
}
})
} else {
FormData.append(name, data);
}
}
var formData = new FormData(),
your_object = {
name: 'test object',
another_object: {
name: 'and other objects',
value: 'whatever'
}
};
appendFormdata(formData, your_object);
其他回答
这个方法将一个JS对象转换为一个FormData:
function convertToFormData(params) { return Object.entries(params) .reduce((acc, [key, value]) => { if (Array.isArray(value)) { value.forEach((v, k) => acc.append(`${key}[${k}]`, value)); } else if (typeof value === 'object' && !(value instanceof File) && !(value instanceof Date)) { Object.entries(value).forEach((v, k) => acc.append(`${key}[${k}]`, value)); } else { acc.append(key, value); } return acc; }, new FormData()); }
在我的例子中，我的对象也有属性，即文件数组。因为它们是二进制的，所以应该以不同的方式处理——索引不需要是键的一部分。所以我修改了@Vladimir Novopashin和@developer033的答案:
export function convertToFormData(data, formData, parentKey) {
if(data === null || data === undefined) return null;
formData = formData || new FormData();
if (typeof data === 'object' && !(data instanceof Date) && !(data instanceof File)) {
Object.keys(data).forEach(key =>
convertToFormData(data[key], formData, (!parentKey ? key : (data[key] instanceof File ? parentKey : `${parentKey}[${key}]`)))
);
} else {
formData.append(parentKey, data);
}
return formData;
}
你可以简单地使用:
formData.append('item', JSON.stringify(item));
使用ES6和更函数式的编程方法@adeneo的答案可能是这样的:
function getFormData(object) {
const formData = new FormData();
Object.keys(object).forEach(key => formData.append(key, object[key]));
return formData;
}
或者使用.reduce()和箭头函数:
const getFormData = object => Object.keys(object).reduce((formData, key) => {
formData.append(key, object[key]);
return formData;
}, new FormData());
递归地
const toFormData = (f => f(f))(h => f => f(x => h(h)(f)(x)))(f => fd => pk => d => { if (d instanceof Object) { Object.keys(d).forEach(k => { const v = d[k] if (pk) k = `${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>
