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javascript - 如何使用 for 循环在另一个对象中设置属性值？

问题描述

我在设置对象属性值时遇到了一个大问题（对我来说这很大）。我有一个这样的对象：

const newPlan = {
    name: '',
    description: '',
    number: '',
    monday: {
        breakfast: '',
        secondBreakfast: '',
        soup: '',
        secondMeal: '',
        supper: '',
    }
};

键的值取决于用户输入。设置前 3 个值很容易，但对象值中的对象有问题，我必须使用这个循环。

有类似的HTML：

<tr>
  <td>PONIEDZIAŁEK</td>
  <td>
    <input list="monday-breakfast" id="monday-1">
    <datalist id="monday-breakfast">
    </datalist>
  </td>
  <td>
    <input list="monday-second-breakfast" id="monday-2">
    <datalist id="monday-second-breakfast">
    </datalist>
  </td>
  <td>
    <input list="monday-soup" id="monday-3">
    <datalist id="monday-soup">
    </datalist>
  </td>
  <td>
    <input list="monday-second-meal" id="monday-4">
    <datalist id="monday-second-meal">

    </datalist>
  </td>
  <td><input list="monday-supper" id="monday-5">
    <datalist id="monday-supper">
    </datalist></td>
</tr>

和我的js：

newPlan.name = planName.value;
newPlan.description = planDescription.value;
newPlan.number = planWeekNumber.value;
for (let i = 0; i < Object.keys(newPlan.monday).length; i++) {
    for (let j = 0; j < allDays.length; j++) {
        Object.values(newPlan.monday)[i] = 'abc';
        break
    }
}

'abc' 值只是示例 - 我想根据用户选择的输入列表值设置值。所以有<input list="monday-breakfast">等等，并且来自这个输入的每个值都应该是正确的键值。最后它应该是这样的，例如：

const newPlan = {
    name: 'some string from input',
    description: 'some string from input',
    number: 'some string from input',
    monday: {
        breakfast: 'some string from input list',
        secondBreakfast: 'some string from input list',
        soup: 'some string from input list',
        secondMeal: 'some string from input list',
        supper: 'some string from input list',
    }
};

标签： javascripthtmlobjectfor-loopdom

解决方案

您需要遍历 的条目newPlan.monday，index因此您可以将当前的值设置为key适当的元素值。在这种情况下，它是monday-index（星期一 1）。

这是一个例子：

const newPlan = {
  name: '',
  description: '',
  number: '',
  monday: {
    breakfast: '',
    secondBreakfast: '',
    soup: '',
    secondMeal: '',
    supper: '',
  }
};

let index = 1;

newPlan.name = document.getElementById('planName').innerHTML;
newPlan.description = document.getElementById('planDescription').innerHTML;
newPlan.number = document.getElementById('planWeekNumber').innerHTML;

for (let [key, value] of Object.entries(newPlan.monday)) {
  newPlan.monday[key] = document.getElementById(`monday-${index}`).value;
  index++;
}

console.log(newPlan);
<tr>
  <td>PONIEDZIAŁEK</td>
  <div id="planName">Plan 1</div>
  <div id="planDescription">Tasty food.</div>
  <div id="planWeekNumber">1</div>
  <td>
    <input list="monday-breakfast" id="monday-1" value="Ham and eggs">
    <datalist id="monday-breakfast"></datalist>
  </td>
  <td>
    <input list="monday-second-breakfast" id="monday-2" value="Cereal">
    <datalist id="monday-second-breakfast"></datalist>
  </td>
  <td>
    <input list="monday-soup" id="monday-3" value="Meat soup">
    <datalist id="monday-soup"></datalist>
  </td>
  <td>
    <input list="monday-second-meal" id="monday-4" value="Hamburger">
    <datalist id="monday-second-meal"></datalist>
  </td>
  <td>
    <input list="monday-supper" id="monday-5" value="Toast">
    <datalist id="monday-supper"></datalist>
  </td>
</tr>

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