htmlhint · thedaviddias · May 16, 2020 · Jul 14, 2016
diff --git a/src/rules/index.js b/src/rules/index.js
@@ -16,6 +16,7 @@ export { default as idClassValue } from './id-class-value';
 export { default as idUnique } from './id-unique';
 export { default as inlineScriptDisabled } from './inline-script-disabled';
 export { default as inlineStyleDisabled } from './inline-style-disabled';
+export { default as inputRequiresLabel } from './input-requires-label';
 export { default as scriptDisabled } from './script-disabled';
 export { default as spaceTabMixedDisabled } from './space-tab-mixed-disabled';
 export { default as specCharEscape } from './spec-char-escape';

diff --git a/src/rules/input-requires-label.js b/src/rules/input-requires-label.js
@@ -0,0 +1,46 @@
+export default {
+    id: 'input-requires-label',
+    description: 'All [ input ] tags must have a corresponding [ label ] tag. ',
+    init: function(parser, reporter){
+        var self = this,
+            labelTags = [],
+            inputTags = [];
+
+        parser.addListener('tagstart', function(event) {
+            var tagName = event.tagName.toLowerCase(),
+              mapAttrs = parser.getMapAttrs(event.attrs),
+              col = event.col + tagName.length + 1;
+
+            if (tagName === 'input') {
+                inputTags.push({event: event, col: col, id: mapAttrs['id']});
+            }
+
+            if (tagName === 'label') {
+                if (('for' in mapAttrs) && mapAttrs['for'] !== '') {
+                    labelTags.push({event: event, col: col, forValue: mapAttrs['for']});
+                }
+            }
+
+        });
+
+        parser.addListener('end', function() {
+            inputTags.forEach(function(inputTag) {
+                if (!hasMatchingLabelTag(inputTag)) {
+                    reporter.warn('No matching [ label ] tag found.', inputTag.event.line, inputTag.col, self, inputTag.event.raw);
+                }
+            });
+        });
+
+
+        function hasMatchingLabelTag(inputTag) {
+            var found = false;
+            labelTags.forEach(function(labelTag){
+                if (inputTag.id && (inputTag.id === labelTag.forValue)) {
+                    found = true;
+                }
+            });
+            return found;
+
+        }
+    }
+};
diff --git a/test/rules/input-requires-label.spec.js b/test/rules/input-requires-label.spec.js
@@ -0,0 +1,71 @@
+const expect  = require("expect.js");
+
+const HTMLHint = require('../../dist/htmlhint.js').HTMLHint;
+
+const ruleId = 'input-requires-label';
+const ruleOptions = {};
+
+ruleOptions[ruleId] = true;
+
+describe(`Rules: ${ruleId}`, function(){
+
+    describe('Successful cases', function() {
+
+        it('Input tag with a matching label before should result in no error', function () {
+            var code = '<label for="some-id"/><input id="some-id" type="password" />';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(0);
+        });
+
+        it('Input tag with a matching label after should result in no error', function () {
+            var code = '<input id="some-id" type="password" /> <label for="some-id"/>';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(0);
+        });
+    });
+
+
+    describe('Error cases', function() {
+
+        it('Input tag with no matching label should result in an error', function () {
+            var code = '<input type="password">';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(1);
+            expect(messages[0].rule.id).to.be(ruleId);
+            expect(messages[0].line).to.be(1);
+            expect(messages[0].col).to.be(7);
+            expect(messages[0].type).to.be('warning');
+        });
+
+        it('Input tag with label that doesn\'t match id should result in error', function () {
+            var code = '<input id="some-id" type="password" /> <label for="some-other-id"/>';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(1);
+            expect(messages[0].rule.id).to.be(ruleId);
+            expect(messages[0].line).to.be(1);
+            expect(messages[0].col).to.be(7);
+            expect(messages[0].type).to.be('warning');
+        });
+
+        it('Input tag with blank label:for should result in error', function () {
+            var code = '<input id="some-id" type="password" /> <label for=""/>';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(1);
+            expect(messages[0].rule.id).to.be(ruleId);
+            expect(messages[0].line).to.be(1);
+            expect(messages[0].col).to.be(7);
+            expect(messages[0].type).to.be('warning');
+        });
+
+        it('Input tag with no id should result in error', function () {
+            var code = '<input type="password" /> <label for="something"/>';
+            var messages = HTMLHint.verify(code, ruleOptions);
+            expect(messages.length).to.be(1);
+            expect(messages[0].rule.id).to.be(ruleId);
+            expect(messages[0].line).to.be(1);
+            expect(messages[0].col).to.be(7);
+            expect(messages[0].type).to.be('warning');
+        });
+    });
+
+});