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108 lines
2.4 KiB
Markdown
108 lines
2.4 KiB
Markdown
# Fallback Option
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In some rare cases, you may fill the value but not the corresponding options. For example in async cases, or simply you passed a bad value. If you want to control the way of the value to be displayed, use `fallback-option` prop to control how to create a option using the value.
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If you don't need fallback options, simply set it to `false`. Now only the value appeared in the options will be viewed as a valid value. Invalid values will be cleared in the operations of the component.
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```html
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<n-select
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v-model="singleValue"
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:options="options"
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/>
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<n-select
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v-model="multipleValue"
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multiple
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:fallback-option="trim"
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:options="options"
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/>
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<n-select
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v-model="singleValue"
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placeholder="No Fallback"
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:fallback-option="false"
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:options="options"
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/>
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<n-select
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v-model="multipleValue"
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placeholder="No Fallback"
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multiple
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:fallback-option="false"
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:options="options"
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/>
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```
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```js
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export default {
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data () {
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return {
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trim (value) {
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return {
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label: value.split(' ')[0],
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value
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}
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},
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singleValue: 'A Nowhere Value',
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multipleValue: ['First Nowhere Value', 'Second Nowhere Value'],
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options: [
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{
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label: "Everybody's Got Something to Hide Except Me and My Monkey",
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value: 'song0',
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disabled: true
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},
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{
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label: 'Drive My Car',
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value: 'song1'
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},
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{
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label: 'Norwegian Wood',
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value: 'song2'
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},
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{
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label: 'You Won\'t See',
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value: 'song3',
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disabled: true
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},
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{
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label: 'Nowhere Man',
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value: 'song4'
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},
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{
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label: 'Think For Yourself',
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value: 'song5'
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},
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{
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label: 'The Word',
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value: 'song6'
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},
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{
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label: 'Michelle',
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value: 'song7',
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disabled: true
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},
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{
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label: 'What goes on',
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value: 'song8'
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},
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{
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label: 'Girl',
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value: 'song9'
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},
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{
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label: 'I\'m looking through you',
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value: 'song10'
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},
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{
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label: 'In My Life',
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value: 'song11'
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},
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{
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label: 'Wait',
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value: 'song12'
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}
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]
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}
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}
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}
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```
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```css
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.n-select {
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width: 180px;
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margin: 0 12px 8px 0;
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}
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``` |