How to redirect to URL from HTML form?

B

BogBel2015-08-14 10:02:23

Flask

BogBel, 2015-08-14 10:02:23

Programmatically created dictionary of dictionaries:

from flask import Flask, jsonify,abort,render_template,request,redirect,url_for

app = Flask(__name__)

tasks = [
    {
        'id': 1,
        'title': 'Buy groceries',
        'description': 'Milk, ,Pizza,,Cheese,Fruit, Tylenol',
        'done': False
    },
    {
        'id': 2,
        'title': 'Learn Python',
        'description': 'Need to find a good Python tutorial on the web',
        'done': False
    }
]

each element has an id , a search is created for this id on another stml page:

<html>
    <head>
        <title>Search page</title>
    </head>
    <body>
        <div id="container">
            <div class="title">
                <h1>GET request with Flask</h1>
            </div>

            <form method="GET" action="{{ url_for('get_task',task_id=TaskID) }}">
                <label for="TaskID">Please enter Task ID:</label>
            <input type="text" name="TaskID"  value="0"/><br />
                <input type="submit">
            </form>
            </div>
        </div>
    </body>
</html>

that is, depending on the entered Id , redirect to the page with the task

@app.route('/tasks/<int:task_id>', methods=['GET'])
def get_task(task_id=None):
    if(task_id!=None):
        task_id=int(task_id)
        task = filter(lambda t: t['id'] == task_id, tasks)
        if len(task) == 0:
            abort(404)
        return jsonify({'task': task[0]})
    else:return jsonify({'tasks': tasks})

Well, as it were, the problem is in passing in the TaskIDaction="{{ url_for('get_task',task_id=TaskID) }}"
parameter . When trying to load a page

href=" 127.0.0.1:5000/search_page ">

I get an error

jinja2.exceptions.UndefinedError
UndefinedError: 'TaskID' is undefined

After changing the form as follows, the error changed

<form action="{{ url_for('get_task') }}">
                <label for="TaskID">Please enter Task ID:</label>
            <input type="text" name="task_id"/><br />
                <input type="submit">
            </form>

I am getting the following error while building the project

werkzeug.routing.BuildError
BuildError: ('get_task', {}, None)

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2 answer(s)

P

pcdesign, 2015-08-14
@BogBel

Or maybe you should use the POST method just on '/tasks/'?
Otherwise, it's a double-edged sword. You do not know in advance what the TaskID will be, but you are trying to form a url for it.
The POST method is done like this.
In html code:
In python code:

@app.route('/tasks/', methods=['POST'])
def get_task():
    task_id = request.form['task_id']

D

Dmitry Marinin, 2015-08-14
@Creamov

'TaskID' is undefined

Where can he get the TaskID from ? You haven't posted it anywhere, have you?
Leave only in action{{ url_for('get_task') }} , and change the name attribute of the input element to name="task_id" . The form will send this parameter (input: name => value) to the address specified in action .