onsubmit="return false"是什么意思?(JavaScript，jQuery)

问题描述

我知道提交表单时会发生 onsubmit 事件.

I know that the onsubmit event occurs when a form is submitted.

通常，我们在 onsubmit 事件上调用一个方法，例如 .

Generally, we are calling a method on the onsubmit event, like <form action="" onsubmit="myfunction()">.

今天看到这个，"<form action=""onsubmit="return false">".它是如何工作的?我不明白 onsubmit="return false" 是什么意思.

Today I saw this, "<form action="" onsubmit="return false">". How does it work? I could not understand what is the meaning of onsubmit="return false".

PS:我在学习 Ajax 时发现了这个.这是一个教程，解释了如何在不刷新页面的情况下将数据提交到数据库.

PS: I found this when learning Ajax. It was a tutorial which explains how to submit data to a database without refreshing the page.

推荐答案

例如 - 用于验证目的

查看下面的代码，看看它有什么好处:

See the below code and see how it can be beneficial:

<script language="JavaScript">
myFunctionName() {
    if (document.myForm.myText.value == '')
        return false;
        // When it returns false - your form will not submit and will not redirect too
    else
        return true;
     // When it returns true - your form will submit and will redirect
// (actually it's a part of submit) id you have mentioned in action
}
</script>

<form name="myForm" onSubmit="return myFunctionName()">
<input type="text" name="myText">
<input type="submit" value="Click Me">
</form>

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