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#278 Implement react-a11y-no-onchange.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import * as ts from 'typescript'; | ||
| import * as Lint from 'tslint'; | ||
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| import {ErrorTolerantWalker} from './utils/ErrorTolerantWalker'; | ||
| import {ExtendedMetadata} from './utils/ExtendedMetadata'; | ||
| import {getJsxAttributesFromJsxElement} from './utils/JsxAttribute'; | ||
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| /** | ||
| * Implementation of the react-a11y-no-onchange rule. | ||
| */ | ||
| export class Rule extends Lint.Rules.AbstractRule { | ||
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| public static metadata: ExtendedMetadata = { | ||
| ruleName: 'react-a11y-no-onchange', | ||
| type: 'functionality', | ||
| description: 'For accessibility of select menus, onChange event handler should not be used with the select element.', | ||
| options: 'string[]', | ||
| optionsDescription: 'Additional tag name to validate.', | ||
| optionExamples: ['true', '[true, ["Select"]]'], | ||
| typescriptOnly: false, | ||
| issueClass: 'Non-SDL', | ||
| issueType: 'Warning', | ||
| severity: 'Important', | ||
| level: 'Opportunity for Excellence', | ||
| group: 'Accessibility' | ||
| }; | ||
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| public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] { | ||
| return sourceFile.languageVariant === ts.LanguageVariant.JSX ? | ||
| this.applyWithWalker(new ReactA11yNoOnchangeRuleWalker(sourceFile, this.getOptions())) : | ||
| []; | ||
| } | ||
| } | ||
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| class ReactA11yNoOnchangeRuleWalker extends ErrorTolerantWalker { | ||
| protected visitJsxSelfClosingElement(node: ts.JsxSelfClosingElement): void { | ||
| this.checkJsxOpeningElement(node); | ||
| super.visitJsxSelfClosingElement(node); | ||
| } | ||
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| protected visitJsxElement(node: ts.JsxElement): void { | ||
| this.checkJsxOpeningElement(node.openingElement); | ||
| super.visitJsxElement(node); | ||
| } | ||
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| private checkJsxOpeningElement(node: ts.JsxOpeningLikeElement) { | ||
| const tagName: string = node.tagName.getText(); | ||
| const options: any[] = this.getOptions(); | ||
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| const additionalTagNames: string[] = options.length > 0 ? options[0] : []; | ||
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| const targetTagNames: string[] = ['select', ...additionalTagNames]; | ||
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| if (!tagName || targetTagNames.indexOf(tagName) === -1) { | ||
| return; | ||
| } | ||
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| const attributes = getJsxAttributesFromJsxElement(node); | ||
| if (attributes.hasOwnProperty('onchange')) { | ||
| const errorMessage = `onChange event handler should not be used with the <${tagName}>. Please use onBlur instead.`; | ||
| this.addFailureAt(node.getStart(), node.getWidth(), errorMessage); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| import {TestHelper} from './TestHelper'; | ||
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| /** | ||
| * Unit tests. | ||
| */ | ||
| describe('reactA11yNoOnchangeRule', () : void => { | ||
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| const fileName : string = 'file.tsx'; | ||
| const ruleName : string = 'react-a11y-no-onchange'; | ||
| const errorMessage = (tagName: string): string => | ||
| `onChange event handler should not be used with the <${tagName}>. Please use onBlur instead.`; | ||
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| it('should pass if select element attributes without onChange event', () : void => { | ||
| const script: string = ` | ||
| import React = require('react'); | ||
| const selectElement = <select /> | ||
| const selectElementWithOnBlur = <select onBlur={} />`; | ||
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| TestHelper.assertNoViolation(ruleName, script); | ||
| }); | ||
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| it('should fail if select element attributes contains onChange event', () : void => { | ||
| const script : string = ` | ||
| import React = require('react'); | ||
| const selectElementWithOnChange = <select onChange={} />\`; | ||
| `; | ||
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| TestHelper.assertViolations(ruleName, script, [{ | ||
| failure: errorMessage('select'), | ||
| name: fileName, | ||
| ruleName, | ||
| ruleSeverity: "ERROR", | ||
| startPosition: {character: 47, line: 3} | ||
| }]); | ||
| }); | ||
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| it('should fail if additional tag name specified in options contains onChange event', () => { | ||
| const script : string = ` | ||
| import React = require('react'); | ||
| const selectElementWithOnChange = <Select onChange={} /> | ||
| const selectElementWithOnChange = <select onChange={} /> | ||
| `; | ||
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| TestHelper.assertViolationsWithOptions(ruleName, ['Select'], script, [{ | ||
| failure: errorMessage('Select'), | ||
| name: fileName, | ||
| ruleName, | ||
| ruleSeverity: "ERROR", | ||
| startPosition: {character: 47, line: 3} | ||
| }, { | ||
| failure: errorMessage('select'), | ||
| name: fileName, | ||
| ruleName, | ||
| ruleSeverity: 'ERROR', | ||
| startPosition: { | ||
| 'character': 47, | ||
| 'line': 4 | ||
| } | ||
| }]); | ||
| }); | ||
|
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| }); |
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