拦截 JavaScript 中的表单提交，阻止正常提交 [英] Intercept a form submit in JavaScript and prevent normal submission

问题描述

似乎有很多关于如何使用 javascript 提交表单的信息，但我正在寻找一种解决方案来捕获提交表单并在 javascript 中拦截它.

There seems to be lots of info on how to submit a form using javascript, but I am looking for a solution to capture when a form has been submitted and intercept it in javascript.

HTML

<form>
 <input type="text" name="in" value="some data" />
 <button type="submit">Go</button>
</form>

当用户按下提交按钮时，我不希望提交表单，而是希望调用 JavaScript 函数.

When a user presses the submit button, I do not want the form to be submitted, but instead I would like a JavaScript function to be called.

function captureForm() {
 // do some stuff with the values in the form
 // stop form from being submitted
}

一个快速的技巧是向按钮添加一个 onclick 功能，但我不喜欢这个解决方案......有很多方法可以提交表单......例如在输入时按回车键，这不考虑.

A quick hack would be to add an onclick function to the button but I do not like this solution... there are many ways to submit a form... e.g. pressing return while on an input, which this does not account for.

你

推荐答案

<form id="my-form">
    <input type="text" name="in" value="some data" />
    <button type="submit">Go</button>
</form>

在JS中:

function processForm(e) {
    if (e.preventDefault) e.preventDefault();

    /* do what you want with the form */

    // You must return false to prevent the default form behavior
    return false;
}

var form = document.getElementById('my-form');
if (form.attachEvent) {
    form.attachEvent("submit", processForm);
} else {
    form.addEventListener("submit", processForm);
}

Edit:在我看来，这种方法比在表单上设置 onSubmit 属性更好，因为它保持了标记和功能的分离.但这只是我的两分钱.

Edit: in my opinion, this approach is better than setting the onSubmit attribute on the form since it maintains separation of mark-up and functionality. But that's just my two cents.

Edit2:更新了我的示例以包含 preventDefault()

Edit2: Updated my example to include preventDefault()

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