使用 Vue.js 将复选框设置为选中状态 [英] Setting a checkbox as checked with Vue.js

问题描述

我一直在谷歌上搜索并使用我知道的每个组合，但我无法将我的复选框初始化为选中状态.

示例:

<li v-for="模块中的模块"><label v-bind:for="module.id"><input type="checkbox" v-model="form.modules" v-bind:value="module.id" v-bind:id="module.id"><span>@{{module.name }}</span>

模块数据示例:

<预><代码>[{身份证":1，"name": "业务",检查":真},{身份证":2，"name": "业务 2",检查":假},]

我可以做些什么来初始设置复选框的选中状态?

解决方案

要设置复选框的值，需要将 v-model 绑定到一个值.如果值为真，则复选框将被选中.在这种情况下，您正在迭代 modules 并且每个 module 都有一个 checked 属性.

以下代码将复选框与该属性绑定:

---

请注意，我删除了 v-bind:value=module.id".你不应该在同一个元素上使用 v-model 和 v-bind:value .来自 vue 文档:><块引用>

只是语法糖:

因此，通过使用 v-model 和 v-bind:value，您实际上最终拥有 v-bind:value 两次，这可能会导致未定义的行为.

I have been googling and playing with every combination I know but I cannot get my checkboxes to be initialised as checked.

Example:

<ul class="object administrator-checkbox-list">
    <li v-for="module in modules">
        <label v-bind:for="module.id">
            <input type="checkbox" v-model="form.modules" v-bind:value="module.id" v-bind:id="module.id">
            <span>@{{ module.name }}</span>
        </label>
    </li>
</ul>

An example of the modules data:

[
    {
        "id": 1,
        "name": "Business",
        "checked": true
    },
    {
        "id": 2,
        "name": "Business 2",
        "checked": false
    },
]

What can I do to initially set the checked status of the checkboxes?

解决方案

To set the value of the checkbox, you need to bind the v-model to a value. The checkbox will be checked if the value is truthy. In this case, you are iterating over modules and each module has a checked property.

The following code will bind the checkbox with that property:

<input type="checkbox" v-model="module.checked" v-bind:id="module.id">

---

Notice that I removed v-bind:value="module.id". You shouldn't use v-model and v-bind:value on the same element. From the vue docs:

<input v-model="something">

is just syntactic sugar for:

<input v-bind:value="something" v-on:input="something = $event.target.value">

So, by using v-model and v-bind:value, you actually end up having v-bind:value twice, which could lead to undefined behavior.

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