我有这个URL:

site.fwx?position=1&archiveid=5000&columns=5&rows=20&sorting=ModifiedTimeAsc

我需要的是能够改变'行' url参数值我指定的东西,让我们说10。如果“行”不存在,我需要将它添加到url的末尾,并添加我已经指定的值(10)。


当前回答

     // usage: clear ; cd src/js/node/js-unit-tests/01-set-url-param ; npm test ; cd -
     // prereqs: , nodejs , mocha
     // URI = scheme:[//authority]path[?paramName1=paramValue1&paramName2=paramValue2][#fragment]
     // call by: uri = uri.setUriParam("as","md")
     String.prototype.setUriParam = function (paramName, paramValue) {
        var uri = this
        var fragment = ( uri.indexOf('#') === -1 ) ? '' : uri.split('#')[1]
        uri = ( uri.indexOf('#') === -1 ) ? uri : uri.split('#')[0]
        if ( uri.indexOf("?") === -1 ) { uri = uri + '?&' }
        uri = uri.replace ( '?' + paramName , '?&' + paramName)
        var toRepl = (paramValue != null) ? ('$1' + paramValue) : ''
        var toSrch = new RegExp('([&]' + paramName + '=)(([^&#]*)?)')
        uri = uri.replace(toSrch,toRepl)
        if (uri.indexOf(paramName + '=') === -1 && toRepl != '' ) {
           var ampersandMayBe = uri.endsWith('&') ? '' : '&'
           uri = uri + ampersandMayBe + paramName + "=" + String(paramValue)
        }
        uri = ( fragment.length == 0 ) ? uri : (uri+"#"+fragment) //may-be re-add the fragment
        return uri
     }

     var assert = require('assert');
     describe('replacing url param value', function () {

        // scheme://authority/path[?p1=v1&p2=v2#fragment
        // a clean url
        it('http://org.com/path -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with num value
        it('http://org.com/path?prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=57'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? but string value
        it('http://org.com/path?prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=boo-bar'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=boo-bar-baz'
           var uriActual = uri.setUriParam("bid","boo-bar-baz")
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& but string value
        it('http://org.com/path?&prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with other param
        it('http://org.com/path?prm=src_v&other_p=other_v -> http://org.com/path?&prm=tgt_v&other_p=other_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p=other_v'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& with other param
        it('http://org.com/path?&prm=src_v&other_p=other_v -> http://org.com/path?&prm=tgt_v&other_p=other_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p&other_v'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p&other_v'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with other param with fragment
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& with other param with fragment
        it('http://org.com/path?&prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p&other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p&other_v#f'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // remove the param-name , param-value pair
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",null)
           assert.equal(uriActual, uriExpected);
        });

        // remove the param-name , param-value pair
        it('http://org.com/path?&prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",null)
           assert.equal(uriActual, uriExpected);
        });

        // add a new param name , param value pair
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v&bid=foo-bar#f'
           var uriActual = uri.setUriParam("bid","foo-bar")
           assert.equal(uriActual, uriExpected);
        });

     });

其他回答

想想这个例子:

const myUrl = new URL("http://www.example.com?columns=5&rows=20");
myUrl.searchParams.set('rows', 10);
console.log(myUrl.href); // http://www.example.com?columns=5&rows=10
myUrl.searchParams.set('foo', 'bar'); // add new param
console.log(myUrl.href); // http://www.example.com?columns=5&rows=10&foo=bar

它会做和你要求的完全一样的事情。请注意URL必须有正确的格式。在你的例子中,你必须指定协议(http或https)

下面是一个使用query-string库的简单解决方案。

const qs = require('query-string')
function addQuery(key, value) {
  const q = qs.parse(location.search)
  const url = qs.stringifyUrl(
    {
      url: location.pathname,
      query: {
      ...q,
      [key]: value,
      },
    },
    { skipEmptyString: true }
  );
  window.location.href = url
  // if you are using Turbolinks
  // add this: Turbolinks.visit(url)
}
// Usage
addQuery('page', 2)

如果你使用react而不使用react-router

export function useAddQuery() {
  const location = window.location;
  const addQuery = useCallback(
    (key, value) => {
      const q = qs.parse(location.search);
      const url = qs.stringifyUrl(
        {
          url: location.pathname,
          query: {
            ...q,
            [key]: value,
          },
        },
        { skipEmptyString: true }
      );
      window.location.href = url
    },
    [location]
  );

  return { addQuery };
}
// Usage
const { addQuery } = useAddQuery()
addQuery('page', 2)

如果你使用react和react-router

export function useAddQuery() {
  const location = useLocation();
  const history = useHistory();

  const addQuery = useCallback(
    (key, value) => {
      let pathname = location.pathname;
      let searchParams = new URLSearchParams(location.search);
      searchParams.set(key, value);
      history.push({
        pathname: pathname,
        search: searchParams.toString()
      });
    },
    [location, history]
  );

  return { addQuery };
}

// Usage
const { addQuery } = useAddQuery()
addQuery('page', 2)

PS: qs是从query-string模块导入的。

在这里,我引用了Adil Malik的回答,并修正了我认为的3个问题。

/**
 * Adds or updates a URL parameter.
 *
 * @param {string} url  the URL to modify
 * @param {string} param  the name of the parameter
 * @param {string} paramVal  the new value for the parameter
 * @return {string}  the updated URL
 */
self.setParameter = function (url, param, paramVal){
  // http://stackoverflow.com/a/10997390/2391566
  var parts = url.split('?');
  var baseUrl = parts[0];
  var oldQueryString = parts[1];
  var newParameters = [];
  if (oldQueryString) {
    var oldParameters = oldQueryString.split('&');
    for (var i = 0; i < oldParameters.length; i++) {
      if(oldParameters[i].split('=')[0] != param) {
        newParameters.push(oldParameters[i]);
      }
    }
  }
  if (paramVal !== '' && paramVal !== null && typeof paramVal !== 'undefined') {
    newParameters.push(param + '=' + encodeURI(paramVal));
  }
  if (newParameters.length > 0) {
    return baseUrl + '?' + newParameters.join('&');
  } else {
    return baseUrl;
  }
}

一个可行的替代字符串操作的方法是建立一个html表单,只修改rows元素的值吗?

html就像是

<form id='myForm' target='site.fwx'>
    <input type='hidden' name='position' value='1'/>
    <input type='hidden' name='archiveid' value='5000'/>
    <input type='hidden' name='columns' value='5'/>
    <input type='hidden' name='rows' value='20'/>
    <input type='hidden' name='sorting' value='ModifiedTimeAsc'/>
</form>

使用下面的JavaScript提交表单

var myForm = document.getElementById('myForm');
myForm.rows.value = yourNewValue;
myForm.submit();

可能不适合所有情况,但可能比解析URL字符串更好。

我也写了一个库获取和设置URL查询参数在JavaScript。

下面是它用法的一个例子。

var url = Qurl.create()
  , query
  , foo
  ;

获取查询参数作为对象,通过键,或添加/更改/删除。

// returns { foo: 'bar', baz: 'qux' } for ?foo=bar&baz=qux
query = url.query();

// get the current value of foo
foo = url.query('foo');

// set ?foo=bar&baz=qux
url.query('foo', 'bar');
url.query('baz', 'qux');

// unset foo, leaving ?baz=qux
url.query('foo', false); // unsets foo