如何监听输入类型为"number"的升压事件? [英] How do I listen for step up event for input type="number"

问题描述

我希望能够使用jQuery监听<input type="number" />上调(递增)和下调事件. (目前我只能理解如何收听更改事件)

I want to be able to listen to <input type="number" /> step UP (increment) and step down events with jQuery. (currently I can only understand how to listen to change event)

推荐答案

up和down没有事件.您可以使用change事件

There is no event for up and down. You can use change event

$(".counter").change(function () {
   alert($(this).val());      
})

演示

您可以尝试类似的操作，可以存储先前的值并将其与当前值进行比较并向上或向下进行识别

You can try something like, You can store previous value and compare with currently value and identify up or down

$(".counter").change(function () {
    if ($(this).data('old-value') < $(this).val()) {
        alert('Alert up');
    } else {
        alert('Alert dowm');
    }
    $(this).data('old-value', $(this).val());
})

演示

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