Flask does not recognize controller when using `url_for()` in HTML form

user_13041346 0
Viewed 138

When trying to implement a basic form I get the following error message: werkzeug.routing.BuildError: Could not build url for endpoint 'finder.search'. Did you mean 'finder.static' instead?, the index.html page does not even load because of this error.

Directory

Steam
  SteamFinder
    static
      style.css
    templates
      index.html
      result.html
    __init__.py
    finder.py
  venv

init.py

from flask import Flask
from flask.templating import render_template


def create_app():
    # create and configure the app
    app = Flask(__name__)

    from . import finder
    app.register_blueprint(finder.bp)

    @app.route("/")
    def home():
        return render_template("index.html")

    return app

finder.py

from flask import Blueprint, request
from flask.templating import render_template

bp = Blueprint("finder", __name__, template_folder="templates", static_folder="static")

bp.route("/search", methods=["POST"])
def search():
    query = request.form["query"]
    print(query)
    return render_template("result.html")

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="../static/style.css"/>
    <title>Home</title>
</head>
<body>

    <form action="{{ url_for('finder.search') }}" method="post">
        <label for="query">Query:</label><br>
        <input type="text" id="query" name="query"><br>
        <input type="submit">
    </form>
    
</body>
</html>
flask python
1 Answers

You cannot use the url_for directly in the template, Jinja cannot process it. You should pass it as a variable to the render_template function and use that variable name in the jinja block.

Example:

return render_template("index.html", form_action_url=url_for('finder.search'))

and the form's action will be:

    <form action="{{ form_action_url }}" method="post">
        <label for="query">Query:</label><br>
        <input type="text" id="query" name="query"><br>
        <input type="submit">
    </form>
user_57366710
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