How to remove some parameters from an URL string?

问题:

I have this var storing a string that represents a URL full of parameters. I'm using AngularJS, and I'm not sure if there is any useful module (or maybe with plain JavaScript) to remove the unneeded URL parameters without having to use regex?

For example I need to remove &month=05 and also &year=2017 from:

var url = "at merge ?derivate=21&gear_type__in=13&engine=73&month=05&year=2017"

回答1:

You can use this function that take 2 parameters: the param you are trying to remove and your source URL:

function removeParam(key, sourceURL) {
    var rtn = sourceURL.split("?")[0],
        param,
        params_arr = [],
        queryString = (sourceURL.indexOf("?") !== -1) ? sourceURL.split("?")[1] : "";
    if (queryString !== "") {
        params_arr = queryString.split("&");
        for (var i = params_arr.length - 1; i >= 0; i -= 1) {
            param = params_arr[i].split("=")[0];
            if (param === key) {
                params_arr.splice(i, 1);
            }
        }
        rtn = rtn + "?" + params_arr.join("&");
    }
    return rtn;
}

var url = "at merge ?derivate=21&gear_type__in=13&engine=73&month=05&year=2017";

var url2 = removeParam("month", url);
var url3 = removeParam("year", url2);

console.log(url3);

---

Alternative solution with a regex

回答2:

Use the URLSearchParams API:

var url = "at merge ?derivate=21&gear_type__in=13&engine=73&month=05&year=2017"
var urlParts = url.split('?');
var params = new URLSearchParams(urlParts[1]);
params.delete('month');
params.delete('year')
var newUrl = urlParts[0] + '?' + params.toString()
console.log(newUrl);

The advantage of using this API is that it works with and creates strings with correct percent encoding.

For more information, see MDN Developer Reference - URLSearchParams API.

回答3:

Using string replace:

var url = "at merge ?derivate=21&gear_type__in=13&engine=73&month=05&year=2017";
var modifiedUrl = url.replace('&month=05','').replace('&year=2017','');
console.log(modifiedUrl);

回答4:

Sure you can use RegExr: ((&)year=([^&]))|((&)month=([^&]))

use:

url = url.replace(/(year=([^&]*))|(month=([^&]*))/g, '');

Read more regex :)...

function removeParam(name, url){
     return url.replace('/((&)*' + name + '=([^&]*))/g','');
}

var url = "?derivate=21&gear_type__in=13&engine=73&month=05&year=2017"

function removeParam(name, _url){
         var reg = new RegExp("((&)*" + name + "=([^&]*))","g");
         return _url.replace(reg,'');
}

url = removeParam('year', url);
url = removeParam('month', url);

document.getElementById('url-replace').innerHTML = url;

<div id="url-replace"></div>

回答5:

You can use the library https://www.npmjs.com/package/query-string

Convert the params to an object and then just use delete params.year delete params.month and convert it back and add it to the original url

const queryString = require('query-string');

console.log(location.search);
//=> '?foo=bar'

const parsed = queryString.parse(location.search);
console.log(parsed);
//=> {foo: 'bar'}

console.log(location.hash);
//=> '#token=bada55cafe'

const parsedHash = queryString.parse(location.hash);
console.log(parsedHash);
//=> {token: 'bada55cafe'}

parsed.foo = 'unicorn';
parsed.ilike = 'pizza';

const stringified = queryString.stringify(parsed);
//=> 'foo=unicorn&ilike=pizza'

location.search = stringified;
// note that `location.search` automatically prepends a question mark
console.log(location.search);
//=> '?foo=unicorn&ilike=pizza'