URLSearchParams Polyfill 

This is a polyfill library for JavaScript's URLSearchParams class.

$3

* Implemented all features from MDN document.
* Can use for both browsers and Node.js.
* Detect if browsers have full support for URLSearchParams and extend it
* Compatible with IE8 and above

Installation

This can also be installed with npm.

``sh
$ npm install url-search-params-polyfill --save
`


For Babel and ES2015+, make sure to import the file:

`javascript
import 'url-search-params-polyfill';
`

For ES5:

`javascript
require('url-search-params-polyfill');
`

For browser, copy the index.js file to your project, and add a script tag in your html:

`html

`




Usage

Use URLSearchParams directly. You can instantiate a new instance of URLSearchParams from a string or an object.

`javascript
// new an empty object
var search1 = new URLSearchParams();

// from a string
var search2 = new URLSearchParams("id=1&from=home");

// from an object
var search3 = new URLSearchParams({ id: 1, from: "home" });

// from location.search, will remove first "?" automatically
var search4 = new URLSearchParams(window.location.search);

// from anther URLSearchParams object
var search5 = new URLSearchParams(search2);

// from a sequence
var search6 = new URLSearchParams([["foo", 1], ["bar", 2]]);
`




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`javascript
var search = new URLSearchParams();

search.append("id", 1);
`

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`javascript
search.delete("id");
`

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`javascript
search.get("id");
`

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`javascript
search.getAll("id");
`

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`javascript
search.has("id");
`

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`javascript
search.set("id", 2);
`

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`javascript
search.toString();
`

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`javascript
search.sort();
`

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`javascript
search.forEach(function (item) {
console.log(item);
});
`

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`javascript
for (var key of search.keys()) {
console.log(key);
}
`

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`javascript
for (var value of search.values()) {
console.log(value);
}
`

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`javascript
for (var item of search) {
console.log('key: ' + item[0] + ', ' + 'value: ' + item[1]);
}
`

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`javascript
console.log(search.size)
`

Known Issues

#### Use with fetch (#18)
Via fetch spec, when passing a URLSearchParams object as a request body, the request should add a header with Content-Type: application/x-www-form-urlencoded; charset=UTF-8, but browsers which have fetch support and not URLSearchParams support do not have this behavior.

Via the data of caniuse, there are many browsers which support fetch but not URLSearchParams:

| Edge | Chrome | Opera | Samsung Internet | QQ | Baidu |
| --- | --- | --- | --- | --- | --- |
| 14 - 16 | 40 - 48 | 27 - 35 | 4 | 1.2 | 7.12 |

If you want to be compatible with these browsers, you should add a Content-Type header manually:

`js
function myFetch(url, { headers = {}, body }) {
headers = headers instanceof Headers ? headers : new Headers(headers);

if (body instanceof URLSearchParams) {
headers.set('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
}

fetch(url, {
headers,
body
});
}
``

LICENSE

MIT license