refactor: Do not rely on prototype.js

Jenkins has been using a very old version of Prototype.js.
Starting with 2.406 of Jenkins, prototype is being gradually removed.

This change removes direct calls to prototype in the git-parameter plugin.

Refs: JENKINS-71298

src/main/resources/net/uaznia/lukanus/hudson/plugins/gitparameter/javascript/git-parameter-select.js

@@ -4,74 +4,99 @@ function gitParameterUpdateSelect(listBox, url, divId, config) {
     config = config || {};
     config = object(config);
     var originalOnSuccess = config.onSuccess;
-    var l = $(listBox);
+    // TODO Inline this variable, maybe?
+    var l = listBox;
     // TODO - Remove '.firstChild?.nextSibling' once this plugin targets https://github.com/jenkinsci/jenkins/pull/6460 or higher
     var status = findFollowingTR(listBox, "validation-error-area").firstChild?.nextSibling || findFollowingTR(listBox, "validation-error-area");
     if (status.firstChild && status.firstChild.getAttribute('data-select-ajax-error')) {
         status.innerHTML = "";
     }
     config.onSuccess = function (rsp) {
-        l.removeClassName("select-ajax-pending");
+        l.classList.remove("select-ajax-pending");
         var currentSelection = l.value;
 
         // clear the contents
         while (l.length > 0) l.options[0] = null;
 
         var selectionSet = false; // is the selection forced by the server?
         var possibleIndex = null; // if there's a new option that matches the current value, remember its index
-        var opts = eval('(' + rsp.responseText + ')').values;
-        for (var i = 0; i < opts.length; i++) {
-            l.options[i] = new Option(opts[i].name, opts[i].value);
-            if (opts[i].selected) {
-                l.selectedIndex = i;
-                selectionSet = true;
+        rsp.json().then(json => {
+            var opts = json.values;
+            for (var i = 0; i < opts.length; i++) {
+                l.options[i] = new Option(opts[i].name, opts[i].value);
+                if (opts[i].selected) {
+                    l.selectedIndex = i;
+                    selectionSet = true;
+                }
+                if (opts[i].value === currentSelection)
+                    possibleIndex = i;
             }
-            if (opts[i].value === currentSelection)
-                possibleIndex = i;
-        }
 
-        // if no value is explicitly selected by the server, try to select the same value
-        if (!selectionSet && possibleIndex != null)
-            l.selectedIndex = possibleIndex;
+            // if no value is explicitly selected by the server, try to select the same value
+            if (!selectionSet && possibleIndex != null)
+                l.selectedIndex = possibleIndex;
 
-        if (originalOnSuccess !== undefined)
-            originalOnSuccess(rsp);
+            if (originalOnSuccess !== undefined)
+                originalOnSuccess(rsp);
 
-        var errors = eval('(' + rsp.responseText + ')').errors
-        let error_div = $("git_parameter_errors_" + divId);
-        if (errors.length !== 0) {
-            error_div.show();
-            error_div.addClassName("error");
-            let $error_ul = $("git_parameter_errors_ul_" + divId);
-            var lis = "";
-            for (var j = 0; j < errors.length; j++) {
-                lis += "<li>" + escapeHTML(errors[j]) + "</li>"
+            var errors = json.errors
+            let error_div = document.getElementById("git_parameter_errors_" + divId);
+            if (errors.length !== 0) {
+                error_div.style.display = "";
+                error_div.classList.add("error");
+                let $error_ul = document.getElementById("git_parameter_errors_ul_" + divId);
+                var lis = "";
+                for (var j = 0; j < errors.length; j++) {
+                    lis += "<li>" + escapeHTML(errors[j]) + "</li>"
+                }
+                $error_ul.update(lis);
+            } else {
+                error_div.style.display = "none";
             }
-            $error_ul.update(lis);
-        }
-        else {
-            error_div.hide()
-        }
-
+        });
     };
     config.onFailure = function (rsp) {
-        l.removeClassName("select-ajax-pending");
-        status.innerHTML = rsp.responseText;
-        if (status.firstChild) {
-            status.firstChild.setAttribute('data-select-ajax-error', 'true')
-        }
-        Behaviour.applySubtree(status);
-        // deleting values can result in the data loss, so let's not do that unless instructed
-        var header = rsp.getResponseHeader('X-Jenkins-Select-Error');
-        if (header && "clear" === header.toLowerCase()) {
-            // clear the contents
-            while (l.length > 0) l.options[0] = null;
-        }
+        rsp.text().then(text => {
+            l.classList.remove("select-ajax-pending");
+            status.innerHTML = text;
+            if (status.firstChild) {
+                status.firstChild.setAttribute('data-select-ajax-error', 'true')
+            }
+            Behaviour.applySubtree(status);
+            // deleting values can result in the data loss, so let's not do that unless instructed
+            var header = rsp.headers.get('X-Jenkins-Select-Error');
+            if (header && "clear" === header.toLowerCase()) {
+                // clear the contents
+                while (l.length > 0) l.options[0] = null;
+            }
+        });
 
     };
 
-    l.addClassName("select-ajax-pending");
-    new Ajax.Request(url, config);
+    l.classList.add("select-ajax-pending");
+
+    fetch(url, {
+        method: 'POST',
+        body: stringify(config.parameters),
+        headers: crumb.wrap({})
+    }).then((response) => {
+        if (response.ok) {
+            config.onSuccess(response);
+        } else {
+            config.onFailure(response);
+        }
+    });
+}
+
+function stringify(obj) {
+  // TODO simplify when Prototype.js is removed
+  if (Object.toJSON) {
+    // Prototype.js
+    return Object.toJSON(obj);
+  } else {
+    // Standard
+    return JSON.stringify(obj);
+  }
 }
 
 Behaviour.specify("SELECT.gitParameterSelect", 'gitParameterSelect', 1000, function (e) {
@@ -120,4 +145,4 @@ Behaviour.specify("SELECT.gitParameterSelect", 'gitParameterSelect', 1000, funct
 
 function escapeHTML(str) {
     return str.replace(/&/g, "&#38;").replace(/"/g, "&#34;").replace(/'/g, "&#39;").replace(/</g, "&#60;");
-}
+}

src/main/resources/net/uaznia/lukanus/hudson/plugins/gitparameter/javascript/git-parameter.js

@@ -127,8 +127,7 @@ var GitParameter = GitParameter || (function($) {
             var regex = new RegExp(search,"gi");
 
             var filteredOptions = Array();
-            $.each(originalOptions, function(i) {
-                var option = originalOptions[i];
+            originalOptions.forEach(option => {
                 if(option.text.match(regex) !== null) {
                     filteredOptions.push(option)
                 }