Javascript：在 onkeyup 事件中更改值时不会触发 onchange 事件
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Javascript : onchange event does not fire when value is changed in onkeyup event
提问by hieund
I have this simply code :
我有这个简单的代码：
<body>
<input type="text" onkeyup="this.value = (new Date()).getSeconds()" onchange="alert(1)" />
</body>
I dont't know why the textbox value has changed when i press the key but the onchange event does not fire. How can i fire onchange event ?
我不知道为什么当我按下键时文本框的值发生了变化，但 onchange 事件没有触发。我怎样才能触发 onchange 事件？
采纳答案by martriay
The onchangewill fire when you leave the focus from it (if you performed any changes). This behavior occurs only with textand textareainput types because javascript doesn't know when you're done typing.
onchange当您离开它时（如果您进行了任何更改），它将触发。此行为仅在输入类型text和textarea输入类型时发生，因为 javascript 不知道您何时完成输入。
I don't know why there is a checkbox in the code, but whatever. Sincerely, I'm not being able to tell you why, but the problem is the dynamic value change on the input (a guess would be that the change isn't performed by the user, but I really don't know), if you remove the code inside the onkeyup it will work. Whatever, if what you want is to execute some code when the input loses focus, you can use onblurinstead, is more accurate in that case.
我不知道为什么代码中有一个复选框，但无论如何。真诚地，我无法告诉您原因，但问题是输入的动态值更改（猜测是更改不是由用户执行的，但我真的不知道），如果您删除 onkeyup 中的代码它将起作用。无论如何，如果您想要在输入失去焦点时执行一些代码，您可以onblur改用，在这种情况下更准确。
