[英]How do you access array data in a computed function with Vue.js
I am new to Vue.js and I can't seem to figure out how to change the format of data. 我是Vue.js的新手,似乎无法弄清楚如何更改数据格式。 Currently it's using the following structure.
当前,它使用以下结构。
app.js: app.js:
new Vue({
el: '#app',
data: {
price: 0,
shipping: 0,
handling: 0,
discount: 0
},
computed: {
total: function () {
return ((
this.price * 100 +
this.shipping * 100 +
this.handling * 100 -
this.discount * 100
) / 100).toFixed(2)
}
}
})
index.html: index.html:
<div id="app" class="row">
<currency-input label="Price" v-model="price"></currency-input>
<currency-input label="Shipping" v-model="shipping"></currency-input>
<currency-input label="Handling" v-model="handling"></currency-input>
<currency-input label="Discount" v-model="discount"></currency-input>
<p class="medium-12 columns">Total: ${{ total }}</p>
</div>
http://codepen.io/pixelasticity/pen/rjeVgz http://codepen.io/pixelasticity/pen/rjeVgz
I want to change the data to the following, or some variation thereof, but it doesn't work. 我想将数据更改为以下内容,或对其进行某些更改,但是它不起作用。
app.js: app.js:
new Vue({
el: '#app',
data: {
products: [
{
price: 0,
shipping: 0,
handling: 0,
discount: 0
}
]
},
computed: {
total: function () {
return ((
this.products[0].price * 100 +
this.products[0].shipping * 100 +
this.products[0].handling * 100 -
this.products[0].discount * 100
) / 100).toFixed(2)
}
}
})
What am I missing? 我想念什么?
You have to update properties in v-model directives, too. 您还必须更新v-model指令中的属性。
<currency-input label="Price" v-model="products[0].price"></currency-input>
<currency-input label="Shipping" v-model="products[0].shipping"></currency-input>
<currency-input label="Handling" v-model="products[0].handling"></currency-input>
<currency-input label="Discount" v-model="products[0].discount"></currency-input>
This ansewers your question. 这回答了您的问题。 However, your data structure seems wired.
但是,您的数据结构似乎是有线的。 Why you need a array here while you sum only first product?
为什么在只累加第一个乘积时需要在这里放置一个数组? Your
total
computed property do not sum all other products anyway. 无论如何,您的
total
计算属性不会对所有其他乘积求和。
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