Set default value to option select menu

问题

I want to bind a custom attribute to an option select menu. The <option> tag would simply have an attribute of selected="selected"

<template>
  <div>
    <select>
      <option v-for="" v-bind:selected="[condition ? selected : notSelected]" value="">{{ resource.xprm_name }}</option>
    </select>
  </div>
</template>

data: {
  selected: "selected",
  notSelected: ""
}

This does not work, but if I change v-bind:selected to v-bind:class then it receives the appropriate class, so the logic is working, but not with the selected attribute.

Any way to make it work with such custom attributes?

回答1:

You can just use v-model for selecting a default value on a select box:

Markup:

<div id="app">
  <select v-model="selected">
     <option value="foo">foo</option>
     <option value="bar">Bar</option>
     <option value="baz">Baz</option>
  </select>
</div>

View Model:

new Vue({
  el: "#app",
  data: {
    selected: 'bar'
  }
});

Here's the JSFiddle: https://jsfiddle.net/Lxfxyqmf/

回答2:

html:

<div id="myComponent">
    <select v-model="selectedValue">
        <option 
            v-for="listValue in valuesList" 
            :selected="selectedValue == listValue.id"
            :value="listValue.id"
        >
            @{{listValue.name}}
        </option>
    </select>
    <span>Chosen item: @{{ selectedValue }}</span>
</div>

js:

var app = new Vue({
    el: '#myComponent',
    data: {
        selectedValue: 2,
        valuesList: [
            {name: 'One', id: 1},
            {name: 'Two', id: 2},
            {name: 'Three', id: 3},
        ]
    },

来源：https://stackoverflow.com/questions/41122028/set-default-value-to-option-select-menu

标签

vue-component

Vue.js

vuejs2