Two-way binding form data

1. Checkbox

checkedNames is the value of the value of the selected check box, the array values are arranged in the order of check box selection

// Multiple checkboxes are bound to the array
<div id='example-3'>
  <input type="checkbox" id="jack" value="Jack" v-model="checkedNames">
  <label for="jack">Jack</label>
  <input type="checkbox" id="john" value="John" v-model="checkedNames">
  <label for="john">John</label>
  <input type="checkbox" id="mike" value="Mike" v-model="checkedNames">
  <label for="mike">Mike</label>
  <br>
  <span>Checked names: {{ checkedNames }}</span>
</div>


new View ({
  the: '# example-3' ,
  data: {
    checkedNames: []
  }
})

2. Radio button

The picked output value is the value of the value of the selected radio button

<div id="example-4">
  <input type="radio" id="one" value="One" v-model="picked">
  <label for="one">One</label>
  <br>
  <input type="radio" id="two" value="Two" v-model="picked">
  <label for="two">Two</label>
  <br>
  <span>Picked: {{ picked }}</span>
</div>


new View ({
  the: '# example-4' ,
  data: {
    picked: ''
  }
})

3. Selection box

1. When single selection

selected is the selected option value

Note: If v-model the initial value of the expression fails to match any option, the <select> element will be rendered as "unselected"

<div id="example-5">
  <select v-model="selected">
    <option disabled value="">请选择</option>
    <option>A</option>
    <option>B</option>
    <option>C</option>
  </select>
  <span>Selected: {{ selected }}</span>
</div>

new View ({
  the: '...' ,
  data: {
    selected: ''
  }
})

2. When multiple selection

The selected value is the selected option, the sorting in the array is sorted according to the option, different from the checkbox according to the order

<div id="example-6">
  <select v-model="selected" multiple style="width: 50px;">
    <option>A</option>
    <option>B</option>
    <option>C</option>
  </select>
  <br>
  <span>Selected: {{ selected }}</span>
</div>

new View ({
  the: '# example-6' ,
  data: {
    selected: []
  }
})

3. Use v-for to render radio

The option displays text, and what we selected is the value. example:

<select v-model="selected">
  <option v-for="option in options" v-bind:value="option.value">
    {{ option.text }}
  </option>
</select>
<span>Selected: {{ selected }}</span>


new View ({
  the: '...' ,
  data: {
    selected: 'A',
    options: [
      { text: 'One', value: 'A' },
      { text: 'Two', value: 'B' },
      { text: 'Three', value: 'C' }
    ]
  }
})

Two-way binding form data

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