英文:
math.max: find the highest numeric value from a string
问题
如何基于这样的索引获取最高的数字值？
<div class="repeater-item" data-index="0-0"></div><div class="repeater-item" data-index="0-1"></div><div class="repeater-item" data-index="0-2"></div><div class="repeater-item" data-index="1-0"></div><div class="repeater-item" data-index="1-1"></div><div class="repeater-item" data-index="2-0"></div><div class="repeater-item" data-index="2-1"></div>
在我的示例中，必须检索的最高索引是2-1，然后递增：1（2-2、2-3...）
const getIndex = function() {var num = $(".repeater-item").map(function() {return $(this).data('index');}).get();return Math.max.apply(Math, num); // 失败}
这段代码可以成功获取索引，但无法根据我的示例计算最高索引。
英文:
How to get the highest numeric value based on indexes like this ?
<div class="repeater-item" data-index="0-0"></div><div class="repeater-item" data-index="0-1"></div><div class="repeater-item" data-index="0-2"></div><div class="repeater-item" data-index="1-0"></div><div class="repeater-item" data-index="1-1"></div><div class="repeater-item" data-index="2-0"></div><div class="repeater-item" data-index="2-1"></div>
In my example, the highest index that must be retrieved is 2-1 in order to increment, thereafter: 1 (2-2, 2,3 ....)
const getIndex = function(){var num = $(".repeater-item").map(function() {return $(this).data('index');}).get();return Math.max.apply(Math, num); // Fail}
This code fetches the indexes fine but fails to calculate the highest index based on my example
答案1
得分: 0
You can for example, sort an array using data-index as a criteria.
Then get the first element in the sorted array:
const getMaxIndex = () => {const sorted = $(".repeater-item").sort(function (a, b) {const indexANumeric = +$(a).data('index').replace("-", "");const indexBNumeric = +$(b).data('index').replace("-", "");return indexBNumeric - indexANumeric;}).get();return $(sorted[0]).data('index');}
英文:
You can for example, sort an array using data-index as a criteria.
Then get first element in the sorted array:
const getMaxIndex = () => {const sorted = $(".repeater-item").sort(function (a, b) {const indexANumeric = +$(a).data('index').replace("-", "");const indexBNumeric = +$(b).data('index').replace("-", "");return indexBNumeric - indexANumeric;}).get();return $(sorted[0]).data('index');}
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