Flask Academy · 课时

构建一个提交数据的 HTML 表单

创建一个 action 指向某个路由的表单

构建一个提交数据的 HTML 表单 是 CoddyKit 上的免费 Flask Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Why Forms Matter

An HTML form is how a browser collects typed input and hands it to your server. It is the front door for almost every user action. 📝

The form Element

Everything starts with a form tag. The browser bundles whatever fields live inside it and sends them together when the user submits.

<form>
  <!-- fields go here -->
</form>

Point It With action

The action attribute names the URL that receives the data. Leave it empty to post back to the same page the form lives on.

<form action="/signup">

Choose the method

Set method to post so the values travel in the request body, not the URL. That keeps form data tidy and out of browser history.

<form action="/signup" method="post">

Name Every Field

Each input needs a name attribute. That name becomes the key Flask uses to find the value on the server side.

<input type="text" name="username">

Add a Submit Button

A submit button triggers the send. Clicking it tells the browser to gather the named fields and fire the request to your action URL.

<button type="submit">Sign up</button>

Match the Route Methods

The receiving route must allow POST. List it in methods, or Flask answers with a 405 and your form data never lands.

@app.route("/signup", methods=["GET", "POST"])
def signup():
    ...

Read Values From request.form

On the server, posted fields live in request.form, a dict-like object keyed by each input name you defined in the HTML.

username = request.form["username"]

Serve the Form on GET

When the request is a GET, just render the page that shows the empty form so users have something to fill out.

if request.method == "GET":
    return render_template("signup.html")

Handle the POST Branch

When the method is POST, read the fields and act on them. One view can both show the form and process the submission.

if request.method == "POST":
    name = request.form["username"]

A Complete Mini Form

Put it together: a form that posts to /signup and a view that greets the user. That is the full round trip in a few lines.

@app.route("/signup", methods=["GET", "POST"])
def signup():
    if request.method == "POST":
        return "Hi " + request.form["username"]
    return render_template("signup.html")

Quick Check

Let us confirm what makes a form actually post.

Recap: Posting Forms

You built a form with an action and post method, named your fields, allowed POST on the route, and read values from request.form. 🎉

常见问题解答

「构建一个提交数据的 HTML 表单」课时是免费的吗？

是的 — 「构建一个提交数据的 HTML 表单」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「构建一个提交数据的 HTML 表单」这节课中我会学到什么？

创建一个 action 指向某个路由的表单你通过在浏览器中直接运行的动手代码来练习 Flask Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「构建一个提交数据的 HTML 表单」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flask Academy 课中编写并运行代码吗？

能。每节 Flask Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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