jQuery Node.js - 提交表单
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Node.js - submit form
提问by Jenan
I use node.js and express. When I press the button (btnSend), I want to send data to node.js by express (without refresh the page). How do I send data using jQuery?
我使用 node.js 和 express。当我按下按钮 (btnSend) 时，我想通过 express 将数据发送到 node.js（不刷新页面）。如何使用 jQuery 发送数据？
<form action="/Send" method="post">
Username:
<input type="text" name="user" id="txtUser" />
<input type="submit" value="Submit" id="btnSend" />
</form>
回答by Xavi
Here's a rough outline of what your jQuery should look like:
以下是您的 jQuery 外观的粗略轮廓：
$("form").submit(function(e) {
e.preventDefault(); // Prevents the page from refreshing
var $this = $(this); // `this` refers to the current form element
$.post(
$this.attr("action"), // Gets the URL to sent the post to
$this.serialize(), // Serializes form data in standard format
function(data) { /** code to handle response **/ },
"json" // The format the response should be in
);
});
This code snippet finds all form elements on the page and listens for a submit event from them. A form can be submit in a number ways (e.x. clicking a submit button, hitting enter, etc...), so for the sake of usability, it's best to listen for submit events directly opposed to listening for click events key on submit buttons.
此代码片段查找页面上的所有表单元素并侦听来自它们的提交事件。表单可以通过多种方式提交（例如单击提交按钮，按 Enter 等...），因此为了可用性，最好直接监听提交事件，而不是监听提交按钮上的单击事件键.
When a submit event does occurs, the code above first prevents the default browser actions (which among other things refreshes the page) by calling e.preventDefault. It then uses $.postto send the form data to the url specified in the action attribute. Note that $.fn.serializeis used to serialize the form data in a standard format.
当提交事件发生时，上面的代码首先通过调用e.preventDefault. 然后它使用$.post将表单数据发送到 action 属性中指定的 url。请注意，$.fn.serialize用于以标准格式序列化表单数据。
Your express code should look something like this:
你的快递代码应该是这样的：
var express = require('express')
, app = express.createServer();
app.use(express.bodyParser()); // Automatically parses form data
app.post('/Send', function(req, res){ // Specifies which URL to listen for
// req.body -- contains form data
});
app.listen(3000);
The documentation on express.bodyParseris a bit sparse, but after a bit of code spelunkingit looks like it uses node-querystringunderneath the covers.
上的文档express.bodyParser有点稀疏，但经过一些代码探索后，它看起来像是在幕后使用node-querystring。
Hope this helps!
希望这可以帮助！
