Overload ElementError to allow either a message or options

In cases where we want a very different error message, we can now just pass that directly.
alphagov · Oct 19, 2023 · 2205fd7 · 2205fd7
1 parent 4f17a54
commit 2205fd7
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Showing 15 changed files with 136 additions and 76 deletions.
diff --git a/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs b/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs
@@ -120,9 +120,10 @@ export class Accordion extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Accordion',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/button/button.mjs b/packages/govuk-frontend/src/govuk/components/button/button.mjs
@@ -35,9 +35,10 @@ export class Button extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Button',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs b/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs
@@ -75,9 +75,10 @@ export class CharacterCount extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Character count',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 
@@ -88,10 +89,11 @@ export class CharacterCount extends GOVUKFrontendComponent {
         $textarea instanceof HTMLInputElement
       )
     ) {
-      throw new ElementError('.govuk-js-character-count', {
+      throw new ElementError({
         componentName: 'Character count',
         element: $textarea,
-        expectedType: 'HTMLTextareaElement or HTMLInputElement'
+        expectedType: 'HTMLTextareaElement or HTMLInputElement',
+        identifier: 'Form field (`.govuk-js-character-count`)'
       })
     }
 
@@ -140,9 +142,10 @@ export class CharacterCount extends GOVUKFrontendComponent {
     const textareaDescriptionId = `${this.$textarea.id}-info`
     const $textareaDescription = document.getElementById(textareaDescriptionId)
     if (!$textareaDescription) {
-      throw new ElementError(`#${textareaDescriptionId}`, {
+      throw new ElementError({
         componentName: 'Character count',
-        element: $textareaDescription
+        element: $textareaDescription,
+        identifier: `#${textareaDescriptionId}`
       })
     }
 

diff --git a/...ges/govuk-frontend/src/govuk/components/character-count/character-count.puppeteer.test.js b/...ges/govuk-frontend/src/govuk/components/character-count/character-count.puppeteer.test.js
@@ -865,7 +865,8 @@ describe('Character count', () => {
           })
         ).rejects.toEqual({
           name: 'ElementError',
-          message: 'Character count: .govuk-js-character-count not found'
+          message:
+            'Character count: Form field (`.govuk-js-character-count`) not found'
         })
       })
 
@@ -884,7 +885,7 @@ describe('Character count', () => {
         ).rejects.toEqual({
           name: 'ElementError',
           message:
-            'Character count: .govuk-js-character-count is not of type HTMLTextareaElement or HTMLInputElement'
+            'Character count: Form field (`.govuk-js-character-count`) is not of type HTMLTextareaElement or HTMLInputElement'
         })
       })
 

diff --git a/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs b/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs
@@ -31,16 +31,18 @@ export class Checkboxes extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError(`[data-module="${Checkboxes.moduleName}"]`, {
+      throw new ElementError({
         componentName: 'Checkboxes',
-        element: $module
+        element: $module,
+        identifier: `[data-module="${Checkboxes.moduleName}"]`
       })
     }
 
     const $inputs = $module.querySelectorAll('input[type="checkbox"]')
     if (!$inputs.length) {
-      throw new ElementError('input[type="checkbox"]', {
-        componentName: 'Checkboxes'
+      throw new ElementError({
+        componentName: 'Checkboxes',
+        identifier: 'input[type="checkbox"]'
       })
     }
 
@@ -57,8 +59,9 @@ export class Checkboxes extends GOVUKFrontendComponent {
 
       // Throw if target conditional element does not exist.
       if (!document.getElementById(targetId)) {
-        throw new ElementError(`#${targetId}`, {
-          componentName: 'Checkboxes'
+        throw new ElementError({
+          componentName: 'Checkboxes',
+          identifier: `#${targetId}`
         })
       }
 

diff --git a/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs b/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs
@@ -29,9 +29,10 @@ export class ErrorSummary extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Error summary',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs b/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs
@@ -82,18 +82,20 @@ export class ExitThisPage extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Exit this page',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 
     const $button = $module.querySelector('.govuk-exit-this-page__button')
     if (!($button instanceof HTMLAnchorElement)) {
-      throw new ElementError('Button', {
+      throw new ElementError({
         componentName: 'Exit this page',
         element: $button,
-        expectedType: 'HTMLAnchorElement'
+        expectedType: 'HTMLAnchorElement',
+        identifier: 'Button'
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/header/header.mjs b/packages/govuk-frontend/src/govuk/components/header/header.mjs
@@ -45,9 +45,10 @@ export class Header extends GOVUKFrontendComponent {
     super()
 
     if (!$module) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Header',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 
@@ -63,16 +64,18 @@ export class Header extends GOVUKFrontendComponent {
 
     const menuId = $menuButton.getAttribute('aria-controls')
     if (!menuId) {
-      throw new ElementError('.govuk-js-header-toggle[aria-controls]', {
-        componentName: 'Header'
+      throw new ElementError({
+        componentName: 'Header',
+        identifier: '.govuk-js-header-toggle[aria-controls]'
       })
     }
 
     const $menu = document.getElementById(menuId)
     if (!$menu) {
-      throw new ElementError(`#${menuId}`, {
+      throw new ElementError({
         componentName: 'Header',
-        element: $menu
+        element: $menu,
+        identifier: `#${menuId}`
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs b/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs
@@ -26,9 +26,10 @@ export class NotificationBanner extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Notification banner',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/radios/radios.mjs b/packages/govuk-frontend/src/govuk/components/radios/radios.mjs
@@ -31,16 +31,18 @@ export class Radios extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLElement)) {
-      throw new ElementError(`[data-module="${Radios.moduleName}"]`, {
+      throw new ElementError({
         componentName: 'Radios',
-        element: $module
+        element: $module,
+        identifier: `[data-module="${Radios.moduleName}"]`
       })
     }
 
     const $inputs = $module.querySelectorAll('input[type="radio"]')
     if (!$inputs.length) {
-      throw new ElementError('input[type="radio"]', {
-        componentName: 'Radios'
+      throw new ElementError({
+        componentName: 'Radios',
+        identifier: 'input[type="radio"]'
       })
     }
 
@@ -57,8 +59,9 @@ export class Radios extends GOVUKFrontendComponent {
 
       // Throw if target conditional element does not exist.
       if (!document.getElementById(targetId)) {
-        throw new ElementError(`#${targetId}`, {
-          componentName: 'Radios'
+        throw new ElementError({
+          componentName: 'Radios',
+          identifier: `#${targetId}`
         })
       }
 

diff --git a/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs b/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs
@@ -27,10 +27,11 @@ export class SkipLink extends GOVUKFrontendComponent {
     super()
 
     if (!($module instanceof HTMLAnchorElement)) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Skip link',
         element: $module,
-        expectedType: 'HTMLAnchorElement'
+        expectedType: 'HTMLAnchorElement',
+        identifier: 'Root element (`$module`)'
       })
     }
 
@@ -51,20 +52,19 @@ export class SkipLink extends GOVUKFrontendComponent {
 
     // Check for link hash fragment
     if (!linkedElementId) {
-      throw new ElementError('$module.hash', {
-        componentName: 'Skip link',
-        element: this.$module,
-        expectedType: 'string'
-      })
+      throw new ElementError(
+        'Skip link: Root element (`$module`) attribute (`href`) has no URL fragment'
+      )
     }
 
     const $linkedElement = document.getElementById(linkedElementId)
 
     // Check for link target element
     if (!$linkedElement) {
-      throw new ElementError(`$module.hash target #${linkedElementId}`, {
+      throw new ElementError({
         componentName: 'Skip link',
-        element: $linkedElement
+        element: $linkedElement,
+        identifier: `Linked element #${linkedElementId}`
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.puppeteer.test.js b/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.puppeteer.test.js
@@ -118,7 +118,7 @@ describe('Skip Link', () => {
       ).rejects.toEqual({
         name: 'ElementError',
         message:
-          'Skip link: $module.hash target #this-element-does-not-exist not found'
+          'Skip link: Linked element #this-element-does-not-exist not found'
       })
     })
 
@@ -130,7 +130,8 @@ describe('Skip Link', () => {
         })
       ).rejects.toEqual({
         name: 'ElementError',
-        message: 'Skip link: $module.hash is not of type string'
+        message:
+          'Skip link: Root element (`$module`) attribute (`href`) has no URL fragment'
       })
     })
   })

diff --git a/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs b/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs
@@ -51,16 +51,18 @@ export class Tabs extends GOVUKFrontendComponent {
     super()
 
     if (!$module) {
-      throw new ElementError('Root element (`$module`)', {
+      throw new ElementError({
         componentName: 'Tabs',
-        element: $module
+        element: $module,
+        identifier: 'Root element (`$module`)'
       })
     }
 
     const $tabs = $module.querySelectorAll('a.govuk-tabs__tab')
     if (!$tabs.length) {
-      throw new ElementError(`a.govuk-tabs__tab`, {
-        componentName: 'Tabs'
+      throw new ElementError({
+        componentName: 'Tabs',
+        identifier: `a.govuk-tabs__tab`
       })
     }
 
@@ -78,14 +80,16 @@ export class Tabs extends GOVUKFrontendComponent {
     )
 
     if (!$tabList) {
-      throw new ElementError(`.govuk-tabs__list`, {
-        componentName: 'Tabs'
+      throw new ElementError({
+        componentName: 'Tabs',
+        identifier: `.govuk-tabs__list`
       })
     }
 
     if (!$tabListItems.length) {
-      throw new ElementError(`.govuk-tabs__list-item`, {
-        componentName: 'Tabs'
+      throw new ElementError({
+        componentName: 'Tabs',
+        identifier: `.govuk-tabs__list-item`
       })
     }
 

diff --git a/packages/govuk-frontend/src/govuk/errors/index.jsdom.test.mjs b/packages/govuk-frontend/src/govuk/errors/index.jsdom.test.mjs
@@ -28,33 +28,42 @@ describe('errors', () => {
   describe('ElementError', () => {
     it('is an instance of GOVUKFrontendError', () => {
       expect(
-        new ElementError('variableName', {
-          componentName: 'Component name'
+        new ElementError({
+          componentName: 'Component name',
+          identifier: 'variableName'
         })
       ).toBeInstanceOf(GOVUKFrontendError)
     })
     it('has its own name set', () => {
       expect(
-        new ElementError('variableName', {
-          componentName: 'Component name'
+        new ElementError({
+          componentName: 'Component name',
+          identifier: 'variableName'
         }).name
       ).toBe('ElementError')
     })
+    it('accepts a string and does not process it in any way', () => {
+      expect(new ElementError('Complex custom error message').message).toBe(
+        'Complex custom error message'
+      )
+    })
     it('formats the message when the element is not found', () => {
       expect(
-        new ElementError('variableName', {
-          componentName: 'Component name'
+        new ElementError({
+          componentName: 'Component name',
+          identifier: 'variableName'
         }).message
       ).toBe('Component name: variableName not found')
     })
     it('formats the message when the element is not the right type', () => {
       const element = document.createElement('div')
 
       expect(
-        new ElementError('variableName', {
+        new ElementError({
           componentName: 'Component name',
           element,
-          expectedType: 'HTMLAnchorElement'
+          expectedType: 'HTMLAnchorElement',
+          identifier: 'variableName'
         }).message
       ).toBe('Component name: variableName is not of type HTMLAnchorElement')
     })