英文:
How to form an array using series of dataset Id values you've collected from a div
问题
数据集ID已附加到图像 假设我已将数据集ID值附加到一系列div中，这些值彼此不同，如果我想收集这些值并将它们组成一个数组，我该如何做？
我已经尝试通过循环遍历它们，因为它们都是具有相同类名的div，但它只会将值返回到单独的数组中，而不是合并到一个数组中。我不能使用array.from()，因为它会将字符串分成单独的字符并形成一个包含它们的数组。你们有什么建议？
英文:
The dataset Id is attached to the imageLet's say for instance I've attached dataset Id values to a series of div's and these values are different from one another, if I want to collect these values and form an array with them how do it do it?
I already tried looping through them since they are all divs with the same class name,but it gives me back the values on individual array and not collectively into one array. I can't use array.from() cos it would just turn the string into separate characters and form an array with them. What do you all suggest I do?
答案1
得分: 1
你可以首先使用document.querySelectorAll按类选择所有元素，然后应用映射函数来读取dataset.id。
const res = Array.from(document.querySelectorAll('.a'), d => d.dataset.id);
console.log(res);
<div data-id="100" class="a"></div>
<div data-id="101" class="a"></div>
<div data-id="102" class="a"></div>
英文:
You can first select all the elements by class with document.querySelectorAll, then apply a mapping function to read the dataset.id.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const res = Array.from(document.querySelectorAll('.a'), d => d.dataset.id);
console.log(res);
<!-- language: lang-html -->
<div data-id="100" class="a"></div>
<div data-id="101" class="a"></div>
<div data-id="102" class="a"></div>
<!-- end snippet -->
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