通过匹配数组检索值

Question

选中复选框的值与数组交叉匹配以过滤结果。如何选择price和lot值？var inputElements = document.getElementsByName("fruits"); const item = [{"lychee":{ price:10, lot:8}}, {"orange" :{ price:12, lot:6}},{"apple" :{ price:8, lot:3}},{"mango"  :{ price:12, lot:5}},{"banana" :{ price:4, lot:1}}];    var checked = [...inputElements].map(item => {   if(item.checked){     return item.value   }}).filter(item => item);console.log(checked); <input type="checkbox" name="fruits" value="lychee" checked> <input type="checkbox" name="fruits" value="orange">

Answer 1

具有正确选择器的QuerySelectorAll将为您提供检查的值：

注意我从对象数组更改为普通对象

const item = { 

  "lychee": {"price": 10,"lot": 8},

  "orange": {"price": 12,"lot": 6},

  "apple":  {"price": 8, "lot": 3},

  "mango":  {"price": 12,"lot": 5},

  "banana": {"price": 4, "lot": 1}

};

let res = [...document.querySelectorAll("[name=fruits]:checked")]

             .map(chk => `${chk.value},lot:${item[chk.value].lot}, price:${item[chk.value].price}`);

document.getElementById("res").innerHTML = res.join("<br/>");

<input type="checkbox" name="fruits" value="lychee" checked> lychee <br />

<input type="checkbox" name="fruits" value="orange"> orange <br />

<input type="checkbox" name="fruits" value="banana" checked> banana <br />

<br/>

<span id="res"></span>

Answer 2

您可以使用document.querySelectorAll(".fruits:checked")class 获取所有已检查的元素.fruits。Set用它的值创建一个对象。

使用filter的过滤器item阵列。

var checked = new Set(Array.from(document.querySelectorAll(".fruits:checked")).map(o => o.value));

const item = [{"lychee":{"price":10,"lot":8}},{"orange":{"price":12,"lot":6}},{"apple":{"price":8,"lot":3}},{"mango":{"price":12,"lot":5}},{"banana":{"price":4,"lot":1}}];

let result = item.filter(o => checked.has(Object.keys(o)[0]));

console.log(result);

<input class="fruits" type="checkbox" name="fruits" value="lychee" checked> lychee <br />

<input class="fruits" type="checkbox" name="fruits" value="orange"> orange <br />

<input class="fruits" type="checkbox" name="fruits" value="banana" checked> banana <br />

Answer 3

使用过滤器获取选中的值。

然后映射数组并只取每个对象元素的值。

var checked = [...inputElements].filter(inputElement => inputElement.checked);

var valuesOfChecked = checked.map(item => [Object.values(item)[0].price,Object.values(item)[0].lot])