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封装seltiplist组件

封装seltiplist组件

1.编写组件

1.清单

依赖清单：

  • underscore.min.js JavaScript工具库

编写清单：

  • seltipoption.vue SelectTipOption，SelectTipList的子组件
  • seltiplist.vue SelectTipList，SelectTipOption的父组件
  • emitter.js 用于父子组件通讯

2.seltipoption.vue

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<template>
  <span class="tip" @click="selectOptionClick" :class="{'active':itemSelected }">{{currentLabel}}</span>
</template>
<script type="text/ecmascript-6">
import Emitter from '../util/emitter'
var underscore = require('../lib/underscore.min')
export default{
  mixins: [Emitter],
  componentName: 'seltipoption',
  props: {
    value: {
      required: true
    },
    label: [String, Number]
  },
  computed: {
    currentLabel () {
      return this.label || ((typeof this.value === 'string' || typeof this.value === 'number') ? this.value : '')
    },
    parent () {
      let result = this.$parent
      while (!result.istipSelect) {
        result = result.$parent
      }
      return result
    },
    itemSelected () {
      if (!this.parent.multiple) {
        return underscore._.isEqual(this.parent.value, this.value)
      } else {
        let isSelected = false
        this.parent.value.forEach((item, index) => {
          if (underscore._.isEqual(item, this.value)) {
            isSelected = true
          }
        })
        return isSelected
      }
    }
  },
  methods: {
    selectOptionClick () {
      this.dispatch('seltiplist', 'handleOptionClick', this.value)
    }
  }
}
</script>

3.seltiplist.vue

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<template>
  <div>
    <slot></slot>
  </div>
</template>
<script type="text/ecmascript-6">
import Emitter from '../util/emitter'
var underscore = require('../lib/underscore.min')
export default{
  mixins: [Emitter],
  componentName: 'seltiplist',
  data () {
    return {
      istipSelect: true
    }
  },
  props: {
    value: {},
    multiple: {
      type: Boolean,
      default: false
    }
  },

  mounted () {
    this.$on('handleOptionClick', this.handleOptionSelect)
  },
  methods: {
    handleOptionSelect (val) {
      if (this.multiple && underscore._.isArray(this.value)) {
        let optionIndex = this.value.indexOf(val)
        this.value.forEach((item, index) => {
          if (underscore._.isEqual(item, val)) {
            optionIndex = index
          }
        })
        if (optionIndex < 0) {
          this.value.push(val)
        } else {
          this.value.splice(optionIndex, 1)
        }
      } else {
        if (val !== this.value) {
          this.$emit('input', val)
        } else {
          this.$emit('input', '')
        }
      }
    }
  }
}
</script>

4.emitter.js

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function broadcast (componentName, eventName, params) {
  this.$children.forEach(child => {
    var name = child.$options.componentName
    if (name === componentName) {
      child.$emit.apply(child, [eventName].concat(params))
    } else {
      broadcast.apply(child, [componentName, eventName].concat(params))
    }
  })
}
export default {
  methods: {
    dispatch (componentName, eventName, params) {
      var parent = this.$parent || this.$root
      var name = parent.$options.componentName

      while (parent && (!name || name !== componentName)) {
        parent = parent.$parent

        if (parent) {
          name = parent.$options.componentName
        }
      }
      if (parent) {
        parent.$emit.apply(parent, [eventName].concat(params))
      }
    },
    broadcast (componentName, eventName, params) {
      broadcast.call(this, componentName, eventName, params)
    }
  }
}

2.使用组件

App.vue

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<template>
  <div style="width: 1100px;margin: 40px auto">
    <div class="conditionbox">
      <div class="selectlist">
        <div class="title">地区</div>
        <div class="select-box">
          <seltiplist  v-model="loacl_select">
            <seltipoption v-for=" item in local " :label="item.label" :value="item" :key="item.id"></seltipoption>
          </seltiplist>
        </div>
      </div>
      <div class="selectlist">
        <div class="title">薪资要求</div>
        <div class="select-box">
          <seltiplist  v-model="salary_select">
            <seltipoption v-for=" item in salary " :label="item.label" :value="item" :key="item.id"></seltipoption>
          </seltiplist>
        </div>
      </div>
      <div class="selectlist">
        <div class="title">福利待遇</div>
        <div class="select-box">
          <seltiplist :multiple="true"  v-model="treatment_select">
            <seltipoption v-for=" item in treatment " :label="item.label" :value="item" :key="item.id"></seltipoption>
          </seltiplist>
        </div>
      </div>
      <div class="selectlist">
        <div class="title">已选条件</div>
        <div class="select-box">
          <span class="tip active" v-if="loacl_select">{{loacl_select.label}}</span>
          <span class="tip active" v-if="salary_select">{{salary_select.label}}</span>
          <span class="tip active" v-for="item in treatment_select" :key="item.id">{{item.label}}</span>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import seltiplist from './components/seltiplist.vue'
import seltipoption from './components/seltipoption.vue'

export default {
  components: {
    seltiplist,
    seltipoption
  },
  data () {
    return {
      loacl_select: '',
      treatment_select: [
        {
          id: 4,
          label: '项目奖金'
        }
      ],
      salary_select: '',
      local: [
        {
          id: 1,
          label: '北京'
        },
        {
          id: 2,
          label: '安徽'
        },
        {
          id: 3,
          label: '上海'
        },
        {
          id: 4,
          label: '广州'
        },
        {
          id: 5,
          label: '青岛'
        }
      ],
      treatment: [
        {
          id: 1,
          label: '五险一金'
        },
        {
          id: 2,
          label: '交通补助'
        },
        {
          id: 3,
          label: '带薪年假'
        },
        {
          id: 4,
          label: '项目奖金'
        }
      ],
      salary: [
        {
          id: 1,
          label: '4000以下'
        },
        {
          id: 2,
          label: '4000-6000'
        },
        {
          id: 3,
          label: '6000-8000'
        },
        {
          id: 4,
          label: '8000以上'
        }
      ]
    }
  },
  methods: {}
}
</script>
<style>
body,
html {
  margin: 0;
  padding: 0;
  font-family: PingFang SC, Hiragino Sans GB, Microsoft Yahei, SimSun, Arial,
    Helvetica Neue, Helvetica;
  -webkit-font-smoothing: antialiased;
  line-height: 1.42857143;
  color: #666;
  font-size: 14px;
  background: #fdfbfb;
}

.conditionbox {
  width: 100%;
  margin-top: 10px;
  background: #fff;
  padding: 20px;
}

.selectlist {
  padding-top: 10px;
  padding-bottom: 10px;
}

.selectlist .title {
  display: inline-block;
  width: 98px;
  margin-left: 10px;
  font-weight: 700;
  font-size: 15px;
  margin-top: 3px;
}

.selectlist .select-box {
  width: 897px;

  position: relative;
  display: inline-block;
}
span.tip {
  padding: 3px 6px;
  cursor: pointer;
  border-radius: 3px;
  font-weight: 600;
  margin: 1px 2px;
  color: #465364;
}
span.tip:hover {
  color: #fff;
  background: #465364;
}
span.tip.active {
  color: #fff;
  background: #465364;
}
</style>

3.代码解释

1.两个组件

一个标签组件seltipoption，方便用v-for进行渲染

一个父组件seltiplist，管理v-model、接收seltipoption事件

2.实现自定义组件v-model数据双向绑定

如果要让组件的v-model生效，则这个组件它必须：

  1. 接收一个value属性。

  2. 在有新的value时触发input事件，直接赋值给this.value是无效的，无法触发更新。

  3. 当为多选项时，更新seltiplist的value数组即可，但是当为单选项时，需要使用this.$emit('input', val)来触发更新

3.父子组件通讯

当seltipoption.vue响应click事件后，通过this.dispatch('seltiplist', 'handleOptionClick', this.value)触发父组件seltiplist.vue的监听this.$on('handleOptionSelect')实现组件间的通讯。

4.seltipoption的选择状态判断

  • 当为单选时，判断seltipoption的value是都等于seltiplist的value
  • 当为多选时，seltipoption的value存在seltiplist的value数组中

5.为了判断两个value值是否相等

此处引入工具库underscore.min.js