element/select.md at 6c1ea22cd455a1cdde64465d3b8c5efdc2179610

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杨奕 f14628254a add popper-class for DatePicker, Select and Tooltip (#1806 )

2016-12-20 16:38:47 +08:00

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Select

When there are plenty of options, use a drop-down menu to display and select desired ones.

Basic usage

:::demo v-model is the value of el-option that is currently selected.

<template>
  <el-select v-model="value" placeholder="Select">
    <el-option
      v-for="item in options"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2'
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value: ''
      }
    }
  }
</script>

:::

Disabled option

:::demo Set the value of disabled in el-option to true to disable this option.

<template>
  <el-select v-model="value2" placeholder="Select">
    <el-option
      v-for="item in options2"
      :label="item.label"
      :value="item.value"
      :disabled="item.disabled">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options2: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2',
          disabled: true
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value2: ''
      }
    }
  }
</script>

:::

Disabled select

Disable the whole component.

:::demo Set disabled of el-select to make it disabled.

<template>
  <el-select v-model="value3" disabled placeholder="Select">
    <el-option
      v-for="item in options"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>
  
<script>
  export default {
    data() {
      return {
        options: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2'
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value3: ''
      }
    }
  }
</script>

:::

Clearable single select

You can clear Select using a clear icon.

:::demo Set clearable attribute for el-select and a clear icon will appear. Note that clearable is only for single select.

<template>
  <el-select v-model="value4" clearable placeholder="Select">
    <el-option
      v-for="item in options"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2'
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value4: ''
      }
    }
  }
</script>

:::

Basic multiple select

Multiple select uses tags to display selected options.

:::demo Set multiple attribute for el-select to enable multiple mode. In this case, the value of v-model will be an array of selected options.

<template>
  <el-select v-model="value5" multiple placeholder="Select">
    <el-option
      v-for="item in options"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2'
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value5: []
      }
    }
  }
</script>

:::

Custom template

You can customize HTML templates for options.

:::demo Insert customized HTML templates into the slot of el-option.

<template>
  <el-select v-model="value6" placeholder="Select">
    <el-option
      v-for="item in cities"
      :label="item.label"
      :value="item.value">
      <span style="float: left">{{ item.label }}</span>
      <span style="float: right; color: #8492a6; font-size: 13px">{{ item.value }}</span>
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        cities: [{
          value: 'Beijing',
          label: 'Beijing'
        }, {
          value: 'Shanghai',
          label: 'Shanghai'
        }, {
          value: 'Nanjing',
          label: 'Nanjing'
        }, {
          value: 'Chengdu',
          label: 'Chengdu'
        }, {
          value: 'Shenzhen',
          label: 'Shenzhen'
        }, {
          value: 'Guangzhou',
          label: 'Guangzhou'
        }],
        value6: ''
      }
    }
  }
</script>

:::

Grouping

Display options in groups.

:::demo Use el-option-group to group the options, and its label attribute stands for the name of the group.

<template>
  <el-select v-model="value7" placeholder="Select">
    <el-option-group
      v-for="group in options3"
      :label="group.label">
      <el-option
        v-for="item in group.options"
        :label="item.label"
        :value="item.value">
      </el-option>
    </el-option-group>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options3: [{
          label: 'Popular cities',
          options: [{
            value: 'Shanghai',
            label: 'Shanghai'
          }, {
            value: 'Beijing',
            label: 'Beijing'
          }]
        }, {
          label: 'City name',
          options: [{
            value: 'Chengdu',
            label: 'Chengdu'
          }, {
            value: 'Shenzhen',
            label: 'Shenzhen'
          }, {
            value: 'Guangzhou',
            label: 'Guangzhou'
          }, {
            value: 'Dalian',
            label: 'Dalian'
          }]
        }],
        value7: ''
      }
    }
  }
</script>

:::

Option filtering

You can filter options for your desired ones.

:::demo Adding filterable to el-select enables filtering. By default, Select will find all the options whose label attribute contains the input value. If you prefer other filtering strategies, you can pass the filter-method. filter-method is a Function that gets called when the input value changed, and its parameter is the current input value.

<template>
  <el-select v-model="value8" filterable placeholder="Select">
    <el-option
      v-for="item in options"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'Option1',
          label: 'Option1'
        }, {
          value: 'Option2',
          label: 'Option2'
        }, {
          value: 'Option3',
          label: 'Option3'
        }, {
          value: 'Option4',
          label: 'Option4'
        }, {
          value: 'Option5',
          label: 'Option5'
        }],
        value8: ''
      }
    }
  }
</script>

:::

Remote Search

Enter keywords and search data from server.

:::demo Set the value of filterable and remote with true to enable remote search, and you should pass the remote-method. remote-method is a Function that gets called when the input value changes, and its parameter is the current input value. Note that if el-option is rendered with the v-for directive, you should add the key attribute for el-option. Its value needs to be unique, such as item.value in the following example.

<template>
  <el-select
    v-model="value9"
    multiple
    filterable
    remote
    placeholder="Please enter a keyword"
    :remote-method="remoteMethod"
    :loading="loading">
    <el-option
      v-for="item in options4"
      :key="item.value"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options4: [],
        value9: [],
        list: [],
        loading: false,
        states: ["Alabama", "Alaska", "Arizona",
        "Arkansas", "California", "Colorado",
        "Connecticut", "Delaware", "Florida",
        "Georgia", "Hawaii", "Idaho", "Illinois",
        "Indiana", "Iowa", "Kansas", "Kentucky",
        "Louisiana", "Maine", "Maryland",
        "Massachusetts", "Michigan", "Minnesota",
        "Mississippi", "Missouri", "Montana",
        "Nebraska", "Nevada", "New Hampshire",
        "New Jersey", "New Mexico", "New York",
        "North Carolina", "North Dakota", "Ohio",
        "Oklahoma", "Oregon", "Pennsylvania",
        "Rhode Island", "South Carolina",
        "South Dakota", "Tennessee", "Texas",
        "Utah", "Vermont", "Virginia",
        "Washington", "West Virginia", "Wisconsin",
        "Wyoming"]
      }
    },
    mounted() {
      this.list = this.states.map(item => {
        return { value: item, label: item };
      });
    },
    methods: {
      remoteMethod(query) {
        if (query !== '') {
          this.loading = true;
          setTimeout(() => {
            this.loading = false;
            this.options4 = this.list.filter(item => {
              return item.label.toLowerCase()
                .indexOf(query.toLowerCase()) > -1;
            });
          }, 200);
        } else {
          this.options4 = [];
        }
      }
    }
  }
</script>

:::

Create new items

Create and select new items that are not included in select options :::demo By using the allow-create attribute, users can create new items by typing in the input box. Note that for allow-create to work, filterable must be true.

<template>
  <el-select
    v-model="value10"
    multiple
    filterable
    allow-create
    placeholder="Choose tags for your article">
    <el-option
      v-for="item in options5"
      :label="item.label"
      :value="item.value">
    </el-option>
  </el-select>
</template>

<script>
  export default {
    data() {
      return {
        options5: [{
          value: 'HTML',
          label: 'HTML'
        }, {
          value: 'CSS',
          label: 'CSS'
        }, {
          value: 'JavaScript',
          label: 'JavaScript'
        }],
        value10: []
      }
    }
  }
</script>

:::

Select Attributes

Attribute	Description	Type	Accepted Values	Default
multiple	whether multiple-select is activated	boolean	—	false
disabled	whether Select is disabled	boolean	—	false
size	size of Input	string	large/small/mini	—
clearable	whether single select can be cleared	boolean	—	false
multiple-limit	maximum number of options user can select when `multiple` is `true`. No limit when set to 0	number	—	0
name	the name attribute of select input	string	—	—
placeholder	placeholder	string	—	Select
filterable	whether Select is filterable	boolean	—	false
allow-create	whether creating new items is allowed. To use this, `filterable` must be true	boolean	—	false
filter-method	custom filter method	function	—	—
remote	whether options are loaded from server	boolean	—	false
remote-method	custom remote search method	function	—	—
loading	whether Select is loading data from server	boolean	—	false
loading-text	displayed text while loading data from server	string	—	Loading
no-match-text	displayed text when no data matches the filtering query	string	—	No matching data
no-data-text	displayed text when there is no options	string	—	No data
popper-class	custom class name for Select's dropdown	string	—	—

Select Events

Event Name	Description	Parameters
change	triggers when the selected value changes	current selected value
visible-change	triggers when the dropdown appears/disappears	true when it appears, and false otherwise

Option Group Attributes

Attribute	Description	Type	Accepted Values	Default
label	name of the group	string	—	—
disabled	whether to disable all options in this group	boolean	—	false

Option Attributes

Attribute	Description	Type	Accepted Values	Default
value	value of option	string/number/object	—	—
label	label of option, same as `value` if omitted	string/number	—	—
disabled	whether option is disabled	boolean	—	false

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