feat(ajax): add params query string parameter configuration

spec/observables/dom/ajax-spec.ts

@@ -1366,6 +1366,173 @@ describe('ajax', () => {
 x-custom-header: test
 x-headers-are-fun: <whatever/> {"weird": "things"}`);
   });
+
+  describe('with params', () => {
+    it('should allow passing of search params as a dictionary', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: { foo: 'bar', whatever: '123' },
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?foo=bar&whatever=123');
+    });
+
+    it('should allow passing of search params as an entries array', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: [
+          ['foo', 'bar'],
+          ['whatever', '123'],
+        ],
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?foo=bar&whatever=123');
+    });
+
+    it('should allow passing of search params as a string', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: '?foo=bar&whatever=123',
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?foo=bar&whatever=123');
+    });
+
+    it('should allow passing of search params as a URLSearchParams object', () => {
+      const params = new URLSearchParams();
+      params.set('foo', 'bar');
+      params.set('whatever', '123');
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: '?foo=bar&whatever=123',
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?foo=bar&whatever=123');
+    });
+
+    it('should not screw things up if there is an existing search string in the url passed', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever?jays_face=is+a+param&lol=haha',
+        params: { foo: 'bar', whatever: '123' },
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?jays_face=is+a+param&lol=haha&foo=bar&whatever=123');
+    });
+
+    it('should overwrite existing args from existing search strings in the url passed', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever?terminator=2&uncle_bob=huh',
+        params: { uncle_bob: '...okayyyyyyy', movie_quote: 'yes' },
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?terminator=2&uncle_bob=...okayyyyyyy&movie_quote=yes');
+    });
+
+    it('should properly encode values', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: { 'this is a weird param name': '?#* value here rofl !!!' },
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?this+is+a+weird+param+name=%3F%23*+value+here+rofl+%21%21%21');
+    });
+
+    it('should handle dictionaries that have numbers, booleans, and arrays of numbers, strings or booleans', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: { a: 123, b: true, c: ['one', 'two', 'three'], d: [1, 3, 3, 7], e: [true, false, true] },
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?a=123&b=true&c=one%2Ctwo%2Cthree&d=1%2C3%2C3%2C7&e=true%2Cfalse%2Ctrue');
+    });
+
+    it('should handle entries that have numbers, booleans, and arrays of numbers, strings or booleans', () => {
+      ajax({
+        method: 'GET',
+        url: '/whatever',
+        params: [
+          ['a', 123],
+          ['b', true],
+          ['c', ['one', 'two', 'three']],
+          ['d', [1, 3, 3, 7]],
+          ['e', [true, false, true]],
+        ],
+      }).subscribe();
+
+      const mockXHR = MockXMLHttpRequest.mostRecent;
+
+      mockXHR.respondWith({
+        status: 200,
+        responseText: JSON.stringify({ whatever: 'I want' }),
+      });
+
+      expect(mockXHR.url).to.equal('/whatever?a=123&b=true&c=one%2Ctwo%2Cthree&d=1%2C3%2C3%2C7&e=true%2Cfalse%2Ctrue');
+    });
+  });
 });
 
 // Some of the older versions of node we test on don't have EventTarget.

src/internal/ajax/ajax.ts

@@ -275,15 +275,53 @@ const LOAD = 'load';
 
 export function fromAjax<T>(config: AjaxConfig): Observable<AjaxResponse<T>> {
   return new Observable((destination) => {
+    // Here we're pulling off each of the configuration arguments
+    // that we don't want to add to the request information we're
+    // passing around.
+    const { params, body: configuredBody, headers: configuredHeaders, ...remainingConfig } = config;
+
+    let { url } = remainingConfig;
+    if (!url) {
+      throw new TypeError('url is required');
+    }
+
+    if (params) {
+      let searchParams: URLSearchParams;
+      if (url.includes('?')) {
+        // If the user has passed a URL with a querystring already in it,
+        // we need to combine them. So we're going to split it. There
+        // should only be one `?` in a valid URL.
+        const parts = url.split('?');
+        if (2 < parts.length) {
+          throw new TypeError('invalid url');
+        }
+        // Add the passed params to the params already in the url provided.
+        searchParams = new URLSearchParams(parts[1]);
+        // params is converted to any because the runtime is *much* more permissive than
+        // the types are.
+        new URLSearchParams(params as any).forEach((value, key) => searchParams.set(key, value));
+        // We have to do string concatenation here, because `new URL(url)` does
+        // not like relative URLs like `/this` without a base url, which we can't
+        // specify, nor can we assume `location` will exist, because of node.
+        url = parts[0] + '?' + searchParams;
+      } else {
+        // There is no pre-existing querystring, so we can just use URLSearchParams
+        // to convert the passed params into the proper format and encodings.
+        // params is converted to any because the runtime is *much* more permissive than
+        // the types are.
+        searchParams = new URLSearchParams(params as any);
+        url = url + '?' + searchParams;
+      }
+    }
+
     // Normalize the headers. We're going to make them all lowercase, since
     // Headers are case insenstive by design. This makes it easier to verify
     // that we aren't setting or sending duplicates.
     const headers: Record<string, any> = {};
-    const requestHeaders = config.headers;
-    if (requestHeaders) {
-      for (const key in requestHeaders) {
-        if (requestHeaders.hasOwnProperty(key)) {
-          headers[key.toLowerCase()] = requestHeaders[key];
+    if (configuredHeaders) {
+      for (const key in configuredHeaders) {
+        if (configuredHeaders.hasOwnProperty(key)) {
+          headers[key.toLowerCase()] = configuredHeaders[key];
         }
       }
     }
@@ -301,8 +339,8 @@ export function fromAjax<T>(config: AjaxConfig): Observable<AjaxResponse<T>> {
 
     // Allow users to provide their XSRF cookie name and the name of a custom header to use to
     // send the cookie.
-    const { withCredentials, xsrfCookieName, xsrfHeaderName } = config;
-    if ((withCredentials || !config.crossDomain) && xsrfCookieName && xsrfHeaderName) {
+    const { withCredentials, xsrfCookieName, xsrfHeaderName } = remainingConfig;
+    if ((withCredentials || !remainingConfig.crossDomain) && xsrfCookieName && xsrfHeaderName) {
       const xsrfCookie = document?.cookie.match(new RegExp(`(^|;\\s*)(${xsrfCookieName})=([^;]*)`))?.pop() ?? '';
       if (xsrfCookie) {
         headers[xsrfHeaderName] = xsrfCookie;
@@ -311,7 +349,7 @@ export function fromAjax<T>(config: AjaxConfig): Observable<AjaxResponse<T>> {
 
     // Examine the body and determine whether or not to serialize it
     // and set the content-type in `headers`, if we're able.
-    const body = extractContentTypeAndMaybeSerializeBody(config.body, headers);
+    const body = extractContentTypeAndMaybeSerializeBody(configuredBody, headers);
 
     const _request: AjaxRequest = {
       // Default values
@@ -323,20 +361,16 @@ export function fromAjax<T>(config: AjaxConfig): Observable<AjaxResponse<T>> {
       responseType: 'json' as XMLHttpRequestResponseType,
 
       // Override with passed user values
-      ...config,
+      ...remainingConfig,
 
       // Set values we ensured above
+      url,
       headers,
       body,
     };
 
     let xhr: XMLHttpRequest;
 
-    const { url } = _request;
-    if (!url) {
-      throw new TypeError('url is required');
-    }
-
     // Create our XHR so we can get started.
     xhr = config.createXHR ? config.createXHR() : new XMLHttpRequest();
 

src/internal/ajax/types.ts

@@ -195,4 +195,22 @@ export interface AjaxConfig {
    * be emitted from the resulting observable.
    */
   includeUploadProgress?: boolean;
+
+  /**
+   * Query string parameters to add to the URL in the request.
+   * <em>This will require a polyfill for `URL` and `URLSearchParams` in Internet Explorer!</em>
+   *
+   * Accepts either a query string, a `URLSearchParams` object, a dictionary of key/value pairs, or an
+   * array of key/value entry tuples. (Essentially, it takes anything that `new URLSearchParams` would normally take).
+   *
+   * If, for some reason you have a query string in the `url` argument, this will append to the query string in the url,
+   * but it will also overwrite the value of any keys that are an exact match. In other words, a url of `/test?a=1&b=2`,
+   * with params of `{ b: 5, c: 6 }` will result in a url of roughly `/test?a=1&b=5&c=6`.
+   */
+  params?:
+    | string
+    | URLSearchParams
+    | Record<string, string | number | boolean | string[] | number[] | boolean[]>
+    | [string, string | number | boolean | string[] | number[] | boolean[]][]
+    | undefined;
 }