vue2/test/unit/specs/directives/if_spec.js

var _ = require('../../../../src/util')
var Vue = require('../../../../src/vue')

if (_.inBrowser) {
  describe('v-if', function () {

    var el
    beforeEach(function () {
      el = document.createElement('div')
      spyOn(_, 'warn')
    })

    function wrap (content) {
      return '<!--v-if-start-->' + content + '<!--v-if-end-->'
    }

    it('normal', function (done) {
      var vm = new Vue({
        el: el,
        data: { test: false, a: 'A' },
        template: '<div v-if="test"><test></test></div>',
        components: {
          test: {
            inherit: true,
            template: '{{a}}'
          }
        }
      })
      // lazy instantitation
      expect(el.innerHTML).toBe(wrap(''))
      expect(vm._children.length).toBe(0)
      vm.test = true
      _.nextTick(function () {
        expect(el.innerHTML).toBe(wrap('<div><test>A</test><!--v-component--></div>'))
        expect(vm._children.length).toBe(1)
        vm.test = false
        _.nextTick(function () {
          expect(el.innerHTML).toBe(wrap(''))
          expect(vm._children.length).toBe(0)
          vm.test = true
          _.nextTick(function () {
            expect(el.innerHTML).toBe(wrap('<div><test>A</test><!--v-component--></div>'))
            expect(vm._children.length).toBe(1)
            var child = vm._children[0]
            vm.$destroy()
            expect(child._isDestroyed).toBe(true)
            done()
          })
        })
      })
    })

    it('template block', function (done) {
      var vm = new Vue({
        el: el,
        data: { test: false, a: 'A', b: 'B' },
        template: '<template v-if="test"><p>{{a}}</p><p>{{b}}</p></template>'
      })
      // lazy instantitation
      expect(el.innerHTML).toBe(wrap(''))
      vm.test = true
      _.nextTick(function () {
        expect(el.innerHTML).toBe(wrap('<p>A</p><p>B</p>'))
        vm.test = false
        _.nextTick(function () {
          expect(el.innerHTML).toBe(wrap(''))
          done()
        })
      })
    })

    it('v-if + v-component', function (done) {
      var attachSpy = jasmine.createSpy()
      var detachSpy = jasmine.createSpy()
      var readySpy = jasmine.createSpy()
      var vm = new Vue({
        el: el,
        data: { ok: false },
        template: '<test v-if="ok"></test>',
        components: {
          test: {
            data: function () {
              return { a: 123 }
            },
            template: '{{a}}',
            ready: readySpy,
            attached: attachSpy,
            detached: detachSpy
          }
        }
      })
      vm.$appendTo(document.body)
      expect(el.innerHTML).toBe(wrap(''))
      expect(vm._children.length).toBe(0)
      vm.ok = true
      _.nextTick(function () {
        expect(el.innerHTML).toBe(wrap('<test>123</test><!--v-component-->'))
        expect(vm._children.length).toBe(1)
        expect(attachSpy).toHaveBeenCalled()
        expect(readySpy).toHaveBeenCalled()
        vm.ok = false
        _.nextTick(function () {
          expect(detachSpy).toHaveBeenCalled()
          expect(el.innerHTML).toBe(wrap(''))
          expect(vm._children.length).toBe(0)
          vm.$remove()
          done()
        })
      })
    })

    it('v-if + dynamic component', function (done) {
      var vm = new Vue({
        el: el,
        data: {
          ok: false,
          view: 'a'
        },
        template: '<component type="{{view}}" v-if="ok"></component>',
        components: {
          a: {
            template: 'AAA'
          },
          b: {
            template: 'BBB'
          }
        }
      })
      expect(el.innerHTML).toBe(wrap(''))
      expect(vm._children.length).toBe(0)
      // toggle if with lazy instantiation
      vm.ok = true
      _.nextTick(function () {
        expect(el.innerHTML).toBe(wrap('<component>AAA</component><!--v-component-->'))
        expect(vm._children.length).toBe(1)
        // switch view when if=true
        vm.view = 'b'
        _.nextTick(function () {
          expect(el.innerHTML).toBe(wrap('<component>BBB</component><!--v-component-->'))
          expect(vm._children.length).toBe(1)
          // toggle if when already instantiated
          vm.ok = false
          _.nextTick(function () {
            expect(el.innerHTML).toBe(wrap(''))
            expect(vm._children.length).toBe(0)
            // toggle if and switch view at the same time
            vm.view = 'a'
            vm.ok = true
            _.nextTick(function () {
              expect(el.innerHTML).toBe(wrap('<component>AAA</component><!--v-component-->'))
              expect(vm._children.length).toBe(1)
              done()
            })
          })
        })
      })
    })

    it('v-if with different truthy values', function (done) {
      var vm = new Vue({
        el: el,
        data: {
          a: 1
        },
        template: '<div v-if="a">{{a}}</div>'
      })
      expect(el.innerHTML).toBe(wrap('<div>1</div>'))
      vm.a = 2
      _.nextTick(function () {
        expect(el.innerHTML).toBe(wrap('<div>2</div>'))
        done()
      })
    })

    it('invalid warn', function () {
      el.setAttribute('v-if', 'test')
      var vm = new Vue({
        el: el
      })
      expect(hasWarned(_, 'already mounted instance')).toBe(true)
    })

    it('v-if with content transclusion', function (done) {
      var vm = new Vue({
        el: el,
        data: {
          a: 1,
          show: true
        },
        template: '<test show="{{show}}">{{a}}</test>',
        components: {
          test: {
            props: ['show'],
            template: '<div v-if="show"><content></cotent></div>'
          }
        }
      })
      expect(el.textContent).toBe('1')
      vm.a = 2
      _.nextTick(function () {
        expect(el.textContent).toBe('2')
        vm.show = false
        _.nextTick(function () {
          expect(el.textContent).toBe('')
          vm.show = true
          vm.a = 3
          _.nextTick(function () {
            expect(el.textContent).toBe('3')
            done()
          })
        })
      })
    })

    it('call attach/detach for transcluded components', function (done) {
      document.body.appendChild(el)
      var attachSpy = jasmine.createSpy('attached')
      var detachSpy = jasmine.createSpy('detached')
      var vm = new Vue({
        el: el,
        data: { show: true },
        template: '<outer><transcluded></transcluded></outer>',
        components: {
          outer: {
            template: '<div v-if="$parent.show"><content></content></div>'
          },
          transcluded: {
            template: 'transcluded',
            attached: attachSpy,
            detached: detachSpy
          }
        }
      })
      expect(attachSpy).toHaveBeenCalled()
      vm.show = false
      _.nextTick(function () {
        expect(detachSpy).toHaveBeenCalled()
        document.body.removeChild(el)
        done()
      })
    })

    it('call attach/detach for dynamicly created components inside if block', function (done) {
      document.body.appendChild(el)
      var attachSpy = jasmine.createSpy('attached')
      var detachSpy = jasmine.createSpy('detached')
      var vm = new Vue({
        el: el,
        data: {
          show: true,
          list: [{a:0}]
        },
        template:
          '<outer>' +
            '<div>' + // an extra layer to test components deep inside the tree
              '<transcluded v-repeat="list"></transcluded>' +
            '</div>' +
          '</outer>',
        components: {
          outer: {
            template:
              '<div v-if="$parent.show">' +
                '<content></content>' +
              '</div>' +
              // this is to test that compnents that are not in the if block
              // should not fire attach/detach when v-if toggles
              '<transcluded></transcluded>'
          },
          transcluded: {
            template: '{{a}}',
            attached: attachSpy,
            detached: detachSpy
          }
        }
      })
      assertMarkup()
      expect(attachSpy.calls.count()).toBe(2)
      vm.show = false
      _.nextTick(function () {
        assertMarkup()
        expect(detachSpy.calls.count()).toBe(1)
        vm.list.push({a:1})
        vm.show = true
        _.nextTick(function () {
          assertMarkup()
          expect(attachSpy.calls.count()).toBe(2 + 2)
          vm.list.push({a:2})
          vm.show = false
          _.nextTick(function () {
            assertMarkup()
            expect(attachSpy.calls.count()).toBe(2 + 2 + 1)
            expect(detachSpy.calls.count()).toBe(1 + 3)
            document.body.removeChild(el)
            done()
          })
        })
      })

      function assertMarkup () {
        var showBlock = vm.show
          ? '<div><div>' +
              vm.list.map(function (o) {
                return '<transcluded>' + o.a + '</transcluded>'
              }).join('') + '<!--v-repeat-->' +
            '</div></div>'
          : ''
        var markup = '<outer>' +
          '<!--v-if-start-->' +
            showBlock +
          '<!--v-if-end-->' +
          '<transcluded></transcluded><!--v-component-->' +
        '</outer><!--v-component-->'
        expect(el.innerHTML).toBe(markup)
      }
    })

  })
}