fix v-on .left .right compat with keyboard events (fix #5046)

src/compiler/codegen/events.js

@@ -29,9 +29,9 @@ const modifierCode: { [key: string]: string } = {
   shift: genGuard(`!$event.shiftKey`),
   alt: genGuard(`!$event.altKey`),
   meta: genGuard(`!$event.metaKey`),
-  left: genGuard(`$event.button !== 0`),
-  middle: genGuard(`$event.button !== 1`),
-  right: genGuard(`$event.button !== 2`)
+  left: genGuard(`'button' in $event && $event.button !== 0`),
+  middle: genGuard(`'button' in $event && $event.button !== 1`),
+  right: genGuard(`'button' in $event && $event.button !== 2`)
 }
 
 export function genHandlers (events: ASTElementHandlers, native?: boolean): string {
@@ -60,12 +60,16 @@ function genHandler (
     for (const key in handler.modifiers) {
       if (modifierCode[key]) {
         code += modifierCode[key]
+        // left/right
+        if (keyCodes[key]) {
+          keys.push(key)
+        }
       } else {
         keys.push(key)
       }
     }
     if (keys.length) {
-      code = genKeyFilter(keys) + code
+      code += genKeyFilter(keys)
     }
     const handlerCode = simplePathRE.test(handler.value)
       ? handler.value + '($event)'
@@ -75,7 +79,7 @@ function genHandler (
 }
 
 function genKeyFilter (keys: Array<string>): string {
-  return `if(${keys.map(genFilterCode).join('&&')})return null;`
+  return `if(!('button' in $event)&&${keys.map(genFilterCode).join('&&')})return null;`
 }
 
 function genFilterCode (key: string): string {

test/unit/features/directives/on.spec.js

@@ -266,6 +266,7 @@ describe('Directive v-on', () => {
       e.keyCode = 1
     })
     expect(spy).toHaveBeenCalled()
+    Vue.config.keyCodes = Object.create(null)
   })
 
   it('should override build-in keyCode', () => {
@@ -288,6 +289,7 @@ describe('Directive v-on', () => {
       e.keyCode = 40
     })
     expect(spy).toHaveBeenCalledTimes(3)
+    Vue.config.keyCodes = Object.create(null)
   })
 
   it('should bind to a child component', () => {
@@ -483,4 +485,45 @@ describe('Directive v-on', () => {
       triggerEvent(vm.$el, 'click')
     }).not.toThrow()
   })
+
+  // Github Issue #5046
+  it('should support keyboard modifier', () => {
+    const spyLeft = jasmine.createSpy()
+    const spyRight = jasmine.createSpy()
+    const spyUp = jasmine.createSpy()
+    const spyDown = jasmine.createSpy()
+    vm = new Vue({
+      el,
+      template: `
+        <div>
+          <input ref="left" @keydown.left="foo"></input>
+          <input ref="right" @keydown.right="foo1"></input>
+          <input ref="up" @keydown.up="foo2"></input>
+          <input ref="down" @keydown.down="foo3"></input>
+        </div>
+      `,
+      methods: {
+        foo: spyLeft,
+        foo1: spyRight,
+        foo2: spyUp,
+        foo3: spyDown
+      }
+    })
+    triggerEvent(vm.$refs.left, 'keydown', e => { e.keyCode = 37 })
+    triggerEvent(vm.$refs.left, 'keydown', e => { e.keyCode = 39 })
+
+    triggerEvent(vm.$refs.right, 'keydown', e => { e.keyCode = 39 })
+    triggerEvent(vm.$refs.right, 'keydown', e => { e.keyCode = 38 })
+
+    triggerEvent(vm.$refs.up, 'keydown', e => { e.keyCode = 38 })
+    triggerEvent(vm.$refs.up, 'keydown', e => { e.keyCode = 37 })
+
+    triggerEvent(vm.$refs.down, 'keydown', e => { e.keyCode = 40 })
+    triggerEvent(vm.$refs.down, 'keydown', e => { e.keyCode = 39 })
+
+    expect(spyLeft.calls.count()).toBe(1)
+    expect(spyRight.calls.count()).toBe(1)
+    expect(spyUp.calls.count()).toBe(1)
+    expect(spyDown.calls.count()).toBe(1)
+  })
 })

test/unit/modules/compiler/codegen.spec.js

@@ -229,27 +229,27 @@ describe('codegen', () => {
   it('generate events with keycode', () => {
     assertCodegen(
       '<input @input.enter="onInput">',
-      `with(this){return _c('input',{on:{"input":function($event){if(_k($event.keyCode,"enter",13))return null;onInput($event)}}})}`
+      `with(this){return _c('input',{on:{"input":function($event){if(!('button' in $event)&&_k($event.keyCode,"enter",13))return null;onInput($event)}}})}`
     )
     // multiple keycodes (delete)
     assertCodegen(
       '<input @input.delete="onInput">',
-      `with(this){return _c('input',{on:{"input":function($event){if(_k($event.keyCode,"delete",[8,46]))return null;onInput($event)}}})}`
+      `with(this){return _c('input',{on:{"input":function($event){if(!('button' in $event)&&_k($event.keyCode,"delete",[8,46]))return null;onInput($event)}}})}`
     )
     // multiple keycodes (chained)
     assertCodegen(
       '<input @keydown.enter.delete="onInput">',
-      `with(this){return _c('input',{on:{"keydown":function($event){if(_k($event.keyCode,"enter",13)&&_k($event.keyCode,"delete",[8,46]))return null;onInput($event)}}})}`
+      `with(this){return _c('input',{on:{"keydown":function($event){if(!('button' in $event)&&_k($event.keyCode,"enter",13)&&_k($event.keyCode,"delete",[8,46]))return null;onInput($event)}}})}`
     )
     // number keycode
     assertCodegen(
       '<input @input.13="onInput">',
-      `with(this){return _c('input',{on:{"input":function($event){if($event.keyCode!==13)return null;onInput($event)}}})}`
+      `with(this){return _c('input',{on:{"input":function($event){if(!('button' in $event)&&$event.keyCode!==13)return null;onInput($event)}}})}`
     )
     // custom keycode
     assertCodegen(
       '<input @input.custom="onInput">',
-      `with(this){return _c('input',{on:{"input":function($event){if(_k($event.keyCode,"custom"))return null;onInput($event)}}})}`
+      `with(this){return _c('input',{on:{"input":function($event){if(!('button' in $event)&&_k($event.keyCode,"custom"))return null;onInput($event)}}})}`
     )
   })