无法使用输入更新 v-model [英] Impossible to update v-model with inputs

问题描述

我在这样的答案中生成对象:

I generate objects in answers like this:

<el-input :id="'question_' + question.id" v-model="answers[question.id]"></el-input>

...当我填写输入时给出以下输出:

...which gives the following output when I fill in inputs:

Answers: object
{
 "19":"Hello",
 "20":"Test",
 "22":"04718810200",
 "26":"Belgium"
}

当用户返回页面时，我希望他们看到他们的答案.我在 axios 调用中像这样收集它们:

When users come back to the page, I want them to see their answers. I collect them like this in my axios call:

axios.get('/bilan/' + this.$route.params.id).then(response => {
  this.questions = response.data.data

  this.questions.questions.forEach(question => {
    if (question.answer) {
      this.answers[question.id] = question.answer.answer
    }
  })
})

它满足了我的对象答案，并且我的输入正确地填充了保存的答案，但不幸的是，它没有预期的行为.当我想修改输入时，它不起作用.什么都填不满.

It fulfills my object answers, and my inputs are correctly filled with the answers saved, but unfortunately, it does not have the expected behavior. When I want to modify an input, it does not work. Nothing fills up.

为什么?

推荐答案

正如@skirlte 所说，有 更改检测警告.

As @skirlte stated, there are change detection caveats.

由于 JavaScript 的限制，Vue 无法检测到以下内容对数组的更改:

Due to limitations in JavaScript, Vue cannot detect the following changes to an array:

当您直接使用索引设置项目时，例如vm.items[indexOfItem] = newValue.修改长度时数组，例如vm.items.length = newLength.所以改变这行代码:

When you directly set an item with the index, e.g. vm.items[indexOfItem] = newValue. When you modify the length of the array, e.g. vm.items.length = newLength. So change this lined of code:

this.answers[question.id] = question.answer.answer

到

this.$set(this.answers, question.id, question.answer.answer)

这篇关于无法使用输入更新 v-model的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！