refactoring

docs/UrlUtils.js

@@ -0,0 +1,38 @@
+class UrlUtils {
+
+    static isSearchParamYES(urlParams, searchParam) {
+        return UrlUtils.#getSearchParam(urlParams, searchParam, 'NO').toUpperCase() == 'YES';
+    }
+
+    static getSearchParamOfCurrentUrl(searchParam) {
+        return UrlUtils.#getSearchParam(
+            new URLSearchParams(window.location.search), 
+            searchParam, 
+            null)
+    }
+
+    static setSearchParamOfCurrentUrl(nameOfSearchParam, valueOfSearchParam) {
+        UrlUtils.#setSearchParam(
+            new URL(window.location.href),
+            nameOfSearchParam,
+            valueOfSearchParam);
+    }
+
+    static downloadUrlAsFilename(url, filename) {
+        const a = document.createElement('a');
+        a.setAttribute('href', url);
+        a.setAttribute('download', filename);
+        a.click();
+    }
+
+    static #getSearchParam(urlParams, searchParam, defaultValue) {
+        return urlParams.has(searchParam) ?
+            urlParams.get(searchParam) :
+            defaultValue;
+    }
+
+    static #setSearchParam(url, nameOfSearchParam, valueOfSearchParam) {
+        url.searchParams.set(nameOfSearchParam, valueOfSearchParam);
+        window.history.replaceState(null, "", url);
+    }
+}