vue/test/unit/features/directives/model-select.spec.js

import Vue from 'vue'
import { looseEqual } from 'shared/util'

// Android 4.4 Chrome 30 has the bug that a multi-select option cannot be
// deseleted by setting its "selected" prop via JavaScript.
function hasMultiSelectBug () {
  var s = document.createElement('select')
  s.setAttribute('multiple', '')
  var o = document.createElement('option')
  s.appendChild(o)
  o.selected = true
  o.selected = false
  return o.selected !== false
}

/**
 * setting <select>'s value in IE9 doesn't work
 * we have to manually loop through the options
 */
function updateSelect (el, value) {
  var options = el.options
  var i = options.length
  while (i--) {
    if (looseEqual(getValue(options[i]), value)) {
      options[i].selected = true
      break
    }
  }
}

function getValue (option) {
  return '_value' in option
    ? option._value
    : option.value || option.text
}

describe('Directive v-model select', () => {
  it('should work', done => {
    const vm = new Vue({
      data: {
        test: 'b'
      },
      template:
        '<select v-model="test">' +
          '<option>a</option>' +
          '<option>b</option>' +
          '<option>c</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    expect(vm.test).toBe('b')
    expect(vm.$el.value).toBe('b')
    expect(vm.$el.childNodes[1].selected).toBe(true)
    vm.test = 'c'
    waitForUpdate(function () {
      expect(vm.$el.value).toBe('c')
      expect(vm.$el.childNodes[2].selected).toBe(true)
      updateSelect(vm.$el, 'a')
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toBe('a')
    }).then(done)
  })

  it('should work with value bindings', done => {
    const vm = new Vue({
      data: {
        test: 2
      },
      template:
        '<select v-model="test">' +
          '<option value="1">a</option>' +
          '<option :value="2">b</option>' +
          '<option :value="3">c</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    expect(vm.$el.value).toBe('2')
    expect(vm.$el.childNodes[1].selected).toBe(true)
    vm.test = 3
    waitForUpdate(function () {
      expect(vm.$el.value).toBe('3')
      expect(vm.$el.childNodes[2].selected).toBe(true)
      updateSelect(vm.$el, '1')
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toBe('1')
    }).then(done)
  })

  it('should work with value bindings (object loose equal)', done => {
    const vm = new Vue({
      data: {
        test: { a: 2 }
      },
      template:
        '<select v-model="test">' +
          '<option value="1">a</option>' +
          '<option :value="{ a: 2 }">b</option>' +
          '<option :value="{ a: 3 }">c</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    expect(vm.$el.childNodes[1].selected).toBe(true)
    vm.test = { a: 3 }
    waitForUpdate(function () {
      expect(vm.$el.childNodes[2].selected).toBe(true)

      updateSelect(vm.$el, '1')
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toBe('1')

      updateSelect(vm.$el, { a: 2 })
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toEqual({ a: 2 })
    }).then(done)
  })

  it('should work with v-for', done => {
    const vm = new Vue({
      data: {
        test: 'b',
        opts: ['a', 'b', 'c']
      },
      template:
        '<select v-model="test">' +
          '<option v-for="o in opts">{{ o }}</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    expect(vm.test).toBe('b')
    expect(vm.$el.value).toBe('b')
    expect(vm.$el.childNodes[1].selected).toBe(true)
    vm.test = 'c'
    waitForUpdate(function () {
      expect(vm.$el.value).toBe('c')
      expect(vm.$el.childNodes[2].selected).toBe(true)
      updateSelect(vm.$el, 'a')
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toBe('a')
      // update v-for opts
      vm.opts = ['d', 'a']
    }).then(() => {
      expect(vm.$el.childNodes[0].selected).toBe(false)
      expect(vm.$el.childNodes[1].selected).toBe(true)
    }).then(done)
  })

  it('should work with v-for & value bindings', done => {
    const vm = new Vue({
      data: {
        test: 2,
        opts: [1, 2, 3]
      },
      template:
        '<select v-model="test">' +
          '<option v-for="o in opts" :value="o">optio {{ o }}</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    expect(vm.$el.value).toBe('2')
    expect(vm.$el.childNodes[1].selected).toBe(true)
    vm.test = 3
    waitForUpdate(function () {
      expect(vm.$el.value).toBe('3')
      expect(vm.$el.childNodes[2].selected).toBe(true)
      updateSelect(vm.$el, 1)
      triggerEvent(vm.$el, 'change')
      expect(vm.test).toBe(1)
      // update v-for opts
      vm.opts = [0, 1]
    }).then(() => {
      expect(vm.$el.childNodes[0].selected).toBe(false)
      expect(vm.$el.childNodes[1].selected).toBe(true)
    }).then(done)
  })

  it('should work with select which has no default selected options', (done) => {
    const spy = jasmine.createSpy()
    const vm = new Vue({
      data: {
        id: 4,
        list: [1, 2, 3],
        testChange: 5
      },
      template:
        '<div>' +
          '<select @change="test" v-model="id">' +
            '<option v-for="item in list" :value="item">{{item}}</option>' +
          '</select>' +
          '{{testChange}}' +
        '</div>',
      methods: {
        test: spy
      }
    }).$mount()
    document.body.appendChild(vm.$el)
    vm.testChange = 10
    waitForUpdate(() => {
      expect(spy.calls.count()).toBe(0)
    }).then(done)
  })

  if (!hasMultiSelectBug()) {
    it('multiple', done => {
      const vm = new Vue({
        data: {
          test: ['b']
        },
        template:
          '<select v-model="test" multiple>' +
            '<option>a</option>' +
            '<option>b</option>' +
            '<option>c</option>' +
          '</select>'
      }).$mount()
      var opts = vm.$el.options
      expect(opts[0].selected).toBe(false)
      expect(opts[1].selected).toBe(true)
      expect(opts[2].selected).toBe(false)
      vm.test = ['a', 'c']
      waitForUpdate(() => {
        expect(opts[0].selected).toBe(true)
        expect(opts[1].selected).toBe(false)
        expect(opts[2].selected).toBe(true)
        opts[0].selected = false
        opts[1].selected = true
        triggerEvent(vm.$el, 'change')
        expect(vm.test).toEqual(['b', 'c'])
      }).then(done)
    })

    it('multiple + v-for', done => {
      const vm = new Vue({
        data: {
          test: ['b'],
          opts: ['a', 'b', 'c']
        },
        template:
          '<select v-model="test" multiple>' +
            '<option v-for="o in opts">{{ o }}</option>' +
          '</select>'
      }).$mount()
      var opts = vm.$el.options
      expect(opts[0].selected).toBe(false)
      expect(opts[1].selected).toBe(true)
      expect(opts[2].selected).toBe(false)
      vm.test = ['a', 'c']
      waitForUpdate(() => {
        expect(opts[0].selected).toBe(true)
        expect(opts[1].selected).toBe(false)
        expect(opts[2].selected).toBe(true)
        opts[0].selected = false
        opts[1].selected = true
        triggerEvent(vm.$el, 'change')
        expect(vm.test).toEqual(['b', 'c'])
        // update v-for opts
        vm.opts = ['c', 'd']
      }).then(() => {
        expect(opts[0].selected).toBe(true)
        expect(opts[1].selected).toBe(false)
        expect(vm.test).toEqual(['c']) // should remove 'd' which no longer has a matching option
      }).then(done)
    })
  }

  it('multiple with static template', () => {
    const vm = new Vue({
      template:
      '<select multiple>' +
        '<option selected>a</option>' +
        '<option selected>b</option>' +
        '<option selected>c</option>' +
      '</select>'
    }).$mount()
    var opts = vm.$el.options
    expect(opts[0].selected).toBe(true)
    expect(opts[1].selected).toBe(true)
    expect(opts[2].selected).toBe(true)
  })

  it('multiple selects', (done) => {
    const spy = jasmine.createSpy()
    const vm = new Vue({
      data: {
        selections: ['', ''],
        selectBoxes: [
          [
            { value: 'foo', text: 'foo' },
            { value: 'bar', text: 'bar' }
          ],
          [
            { value: 'day', text: 'day' },
            { value: 'night', text: 'night' }
          ]
        ]
      },
      watch: {
        selections: spy
      },
      template:
        '<div>' +
          '<select v-for="(item, index) in selectBoxes" v-model="selections[index]">' +
            '<option v-for="element in item" v-bind:value="element.value" v-text="element.text"></option>' +
          '</select>' +
          '<span ref="rs">{{selections}}</span>' +
        '</div>'
    }).$mount()
    document.body.appendChild(vm.$el)
    var selects = vm.$el.getElementsByTagName('select')
    var select0 = selects[0]
    select0.options[0].selected = true
    triggerEvent(select0, 'change')
    waitForUpdate(() => {
      expect(spy).toHaveBeenCalled()
      expect(vm.selections).toEqual(['foo', ''])
    }).then(done)
  })

  it('.number modifier', () => {
    const vm = new Vue({
      data: {
        test: 2
      },
      template:
        '<select v-model.number="test">' +
          '<option value="1">a</option>' +
          '<option :value="2">b</option>' +
          '<option :value="3">c</option>' +
        '</select>'
    }).$mount()
    document.body.appendChild(vm.$el)
    updateSelect(vm.$el, '1')
    triggerEvent(vm.$el, 'change')
    expect(vm.test).toBe(1)
  })

  it('should respect different pritive type value', (done) => {
    const vm = new Vue({
      data: {
        test: 0
      },
      template:
        '<select v-model.number="test">' +
          '<option value="">a</option>' +
          '<option value="0">b</option>' +
          '<option value="1">c</option>' +
          '<option value="false">c</option>' +
          '<option value="true">c</option>' +
        '</select>'
    }).$mount()
    var opts = vm.$el.options
    expect(opts[0].selected).toBe(false)
    expect(opts[1].selected).toBe(true)
    expect(opts[2].selected).toBe(false)
    expect(opts[3].selected).toBe(false)
    expect(opts[4].selected).toBe(false)
    vm.test = 1
    waitForUpdate(() => {
      expect(opts[0].selected).toBe(false)
      expect(opts[1].selected).toBe(false)
      expect(opts[2].selected).toBe(true)
      expect(opts[3].selected).toBe(false)
      expect(opts[4].selected).toBe(false)
      vm.test = ''
    }).then(() => {
      expect(opts[0].selected).toBe(true)
      expect(opts[1].selected).toBe(false)
      expect(opts[2].selected).toBe(false)
      expect(opts[3].selected).toBe(false)
      expect(opts[4].selected).toBe(false)
      vm.test = false
    }).then(() => {
      expect(opts[0].selected).toBe(false)
      expect(opts[1].selected).toBe(false)
      expect(opts[2].selected).toBe(false)
      expect(opts[3].selected).toBe(true)
      expect(opts[4].selected).toBe(false)
      vm.test = true
    }).then(() => {
      expect(opts[0].selected).toBe(false)
      expect(opts[1].selected).toBe(false)
      expect(opts[2].selected).toBe(false)
      expect(opts[3].selected).toBe(false)
      expect(opts[4].selected).toBe(true)
    }).then(done)
  })

  it('should warn inline selected', () => {
    const vm = new Vue({
      data: {
        test: null
      },
      template:
        '<select v-model="test">' +
          '<option selected>a</option>' +
        '</select>'
    }).$mount()
    expect(vm.$el.selectedIndex).toBe(-1)
    expect('inline selected attributes on <option> will be ignored when using v-model')
      .toHaveBeenWarned()
  })

  it('should warn multiple with non-Array value', done => {
    new Vue({
      data: {
        test: 'meh'
      },
      template:
        '<select v-model="test" multiple></select>'
    }).$mount()
    // IE warns on a setTimeout as well
    setTimeout(() => {
      expect('<select multiple v-model="test"> expects an Array value for its binding, but got String')
        .toHaveBeenWarned()
      done()
    }, 0)
  })
})