Passing Line Break "n" or "<br>" from the Main Function to Jinja

Question

I have a list with the name of colors:

colors = [red, green, blue]

And I want it to be printed out on my web page as

red
green
blue

I tried this by using an argument in my HTML template {{colors_out}}, where I pass a string with "n" to it as follows:

colors_out = ""
for i in range(len(colors)):
   colors_out += (str(i) + ". " + colors[i] + "n")

However, that does nothing but add a space between my colors. It prints out these:

0. red 1. green 2. blue

instead of my desired format. I tried replacing "n" with "<br>" in the for loop above too, but then it will result in:

0. red<br>1. green<br>2. blue<br>

Asked By: Nguyen Tran

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Source

Answer 1

One way, which you can try to use a for loop in Jinja2 in your HTML.

You can simply pass a list to the HTML and then use for loop in Jinja2 along with the

tags to print the outputs on seperate lines –

For example in your case –

In your Flask code –

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

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

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

    #your other code

    colors = ['red', 'green', 'blue']
    return render_template('index.html',color=colors)

if __name__ == '__main__':
    app.run()

And your HTML code –

just add this for loop, where i iterates over all the colors and print them in seperate lines

{% for i in color %}
<p>{{ i }} </p>
{% endfor %}

you can also use any other tag as per your requirement, it will still print on new line.

Answered By: Aditya

Passing Line Break "n" or "<br>" from the Main Function to Jinja

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