[PYTHON] (For myself) Flask_3 (form, POST and GET)

item

1. What is an input form and a light form?
2. A bulletin board-like guy with the POST method
3. A bulletin board-like guy with the GET method

1. Feel the form in the input form

――If you just make a form, you don't have to mess with anything on the py side (is there such a thing?)

html

<form action="/result" method="post">
    <label for="article">Post</label>
    <input type="text" name="article">
    <p></p>
    <label for="name">name</label>
    <input type="text" name="name">
    <button type="submit">Send</button>
</form>

--ʻAction = "/ result" specifies to send data to / result --Determine what method to use with method =" post " --ʻInput type = "text" name = "article"decides to make a one-line input field with text, and colors the data input there as article. ――The bottom is almost the same --- By specifying <button type =" submit "> submit </ button> as submit, a button to submit data is created.

--This <form> is used when creating an input / submit form.

2. Receive the input data using the POST method

--First, preparation on the python side to receive

python

from flask import Flask, request, render_template
app = Flask(__name__)

@app.route("/")
def show():
    message = "Hello World"
    return render_template("form.html", message = message)

@app.route("/result", methods=["POST"])
def result():
    article = request.form["article"]
    name = request.form["name"]
    return render_template("form.html",article = article, name = name)

--Declare above using request --Write that the POST method is used by specifying the address specified on the html side above with @ app.route ("/ result", methods = ["POST"]) . --The place where the variable was done is request.form ["~~~ "], so that you can receive the data of the name attribute attached on the html side
Here, you are receiving ʻarticle` etc. ――The rest is almost as you see it

html

<form action="/result" method="post">
    <label for="article">Post</label>
    <input type="text" name="article">
    <p></p>
    <label for="name">name</label>
    <input type="text" name="name">
    <button type="submit">Send</button>
</form>
<p>{{ article }} {{ name }}</p>

--It's almost the same as the above html, but {{article}} {{name}} Only here is different
Well, it's the same as displaying variables

3. Receive input data using GET method

--If you use the GET method, when you receive the input data and display / result, it will look like
/ result? Article = Hello & name = World, and the input contents will appear in the address.

python

from flask import Flask, request, render_template
app = Flask(__name__)

@app.route("/")
def show():
    message = "Hello World"
    return render_template("form.html", message = message)

@app.route("/result", methods=["GET", "POST"])
def result():
    if request.method == "POST":
        article = request.form["article"]
        name = request.form["name"]
    else:
        article = request.args.get("article")
        name = request.args.get("name")
    return render_template("form.html", article = article, name = name)

--methods = ["GET "," POST "] makes both methods compatible --ʻIf request.method == When the method requested by "POST": is POST ... --GET is written as request.args.get ("~~~") like ʻarticle = request.args.get ("article ")

--For html, it is OK if you set the method written to method =" get "

4. At the end

――For the time being, like this ――I feel that the future is getting longer