add Flask-9-flash

xugaoxiang · xugaoxiang · commit 4b631fc4d4c0 · 2020-03-25T18:17:26.000+08:00
diff --git a/Flask-9-flash/run.py b/Flask-9-flash/run.py
@@ -0,0 +1,26 @@
+from flask import Flask, render_template, request, redirect, url_for, flash
+
+app = Flask(__name__)
+app.secret_key = "xxx"
+
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+
+@app.route('/login', methods=['GET', 'POST'])
+def login():
+    error = None
+    if request.method == "POST":
+        if request.form['email'] != 'test@gmail.com' or request.form['password'] != 'test':
+            error = "Invalid account."
+        else:
+            flash("Login successfully")
+            return redirect(url_for('index'))
+    
+    return render_template('login.html', error=error)
+
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/Flask-9-flash/templates/index.html b/Flask-9-flash/templates/index.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Index</title>
+</head>
+<body>
+    {% with messages = get_flashed_messages() %}
+         {% if messages %}
+               {% for message in messages %}
+                    <p>{{ message }}</p>
+               {% endfor %}
+         {% endif %}
+    {% endwith %}
+
+<h3>Welcome!</h3>
+<a href = "{{ url_for('login') }}">login</a>
+</body>
+</html>
diff --git a/Flask-9-flash/templates/login.html b/Flask-9-flash/templates/login.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Login</title>
+</head>
+<body>
+    <form method = "post" action = "http://localhost:5000/login">
+        <table>
+            <tr>
+                <td>Email</td>
+                <td><input type = 'email' name = 'email'></td>
+            </tr>
+            <tr>
+                <td>Password</td>
+                <td><input type = 'password' name = 'password'></td>
+            </tr>
+            <tr>
+                <td><input type = "submit" value = "Submit"></td>
+            </tr>
+        </table>
+    </form>
+
+    {% if error %}
+        <p><strong>Error</strong>: {{ error }}</p>
+    {% endif %}
+</body>
+</html>
diff --git a/README.md b/README.md
@@ -6,4 +6,5 @@
 5. [GET和POST](https://xugaoxiang.com/2020/03/18/flask-5-get-post/)
 6. [Cookie和Session](https://xugaoxiang.com/2020/03/19/flask-6-cookie-session/)
 7. [文件上传](https://xugaoxiang.com/2020/03/20/flask-7-file-upload/)
-8. [重定向](https://xugaoxiang.com/2020/03/23/flask-8-redirect/)
+8. [重定向](https://xugaoxiang.com/2020/03/23/flask-8-redirect/)
+9. [闪现消息](https://xugaoxiang.com/2020/03/25/flask-9-flash/)
