输入更改时如何运行javascript函数 [英] How can I run a javascript function when input changes

问题描述

当用户在我的网站上创建一个新帐户时，我想检查该名称是否已经存在.当他们离开用户名输入框并输入密码时，我希望运行此检查.

When a user creates a new account on my website I want to check if the name already exists. I want this check to run when they leave the username input box and go to enter a password.

我尝试过:

<input type="text" onkeyup="check_user(this.value)"/>

推荐答案

您需要使用"onblur"事件.当控件失去焦点时就会触发，这似乎正是您所需要的.

You need to use the "onblur" event. It fires when a control loses its focus, which seems to be exactly what you need.

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