Add linter for ajax events

Covers these expressions:

    $(el).on("ajaxStart", ...)
    $(el).on("ajaxSend", ...)
    $(el).on("ajaxSuccess", ...)
    $(el).on("ajaxError", ...)
    $(el).on("ajaxComplete", ...)
    $(el).on("ajaxStop", ...)

README.md

@@ -29,6 +29,7 @@ Add `jquery` to the plugins section of your `.eslintrc` configuration file. You
   ],
   "rules": {
     "jquery/no-ajax": 2,
+    "jquery/no-ajax-events": 2,
     "jquery/no-animate": 2,
     "jquery/no-attr": 2,
     "jquery/no-bind": 2,

rules/no-ajax-events.js

@@ -0,0 +1,42 @@
+'use strict'
+
+const utils = require('./utils.js')
+
+const methodName = 'on'
+const disallowedEvents = {
+  ajaxStart: true,
+  ajaxSend: true,
+  ajaxSuccess: true,
+  ajaxError: true,
+  ajaxComplete: true,
+  ajaxStop: true
+}
+
+const MemberExpression = 'MemberExpression'
+const Literal = 'Literal'
+
+module.exports = function(context) {
+  return {
+    CallExpression: function(node) {
+      if (
+        node.callee.type === MemberExpression &&
+        node.callee.property.name === methodName &&
+        node.arguments.length >= 1
+      ) {
+        const arg = node.arguments[0]
+        if (
+          arg.type === Literal &&
+          arg.value in disallowedEvents &&
+          utils.isjQuery(node)
+        ) {
+          context.report({
+            node: node,
+            message: `Prefer remoteForm to ${arg.value}`
+          })
+        }
+      }
+    }
+  }
+}
+
+module.exports.schema = []

tests/no-ajax-events.js

@@ -0,0 +1,59 @@
+'use strict'
+
+const rule = require('../rules/no-ajax-events')
+const RuleTester = require('eslint').RuleTester
+
+const ruleTester = new RuleTester()
+ruleTester.run('no-ajax-events', rule, {
+  valid: [
+    '$(document).on("click", function(e){ })',
+    '$form.on("submit", function(e){ })',
+    '$form.on()',
+    'on("ajaxSuccess", ".js-select-menu", function(e){ })',
+    'form.on("ajaxSend")'
+  ],
+  invalid: [
+    {
+      code: '$(document).on("ajaxSend", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxSend',
+        type: 'CallExpression'
+      }]
+    },
+    {
+      code: '$(document).on("ajaxSuccess", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxSuccess',
+        type: 'CallExpression'
+      }]
+    },
+    {
+      code: '$form.on("ajaxError", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxError',
+        type: 'CallExpression'
+      }]
+    },
+    {
+      code: '$form.on("ajaxComplete", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxComplete',
+        type: 'CallExpression'
+      }]
+    },
+    {
+      code: '$form.on("ajaxStart", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxStart',
+        type: 'CallExpression'
+      }]
+    },
+    {
+      code: '$form.on("ajaxStop", function(e){ })',
+      errors: [{
+        message: 'Prefer remoteForm to ajaxStop',
+        type: 'CallExpression'
+      }]
+    }
+  ]
+})