url_for Is Not Understanding My Variables


Here, I’m trying to make it so that, whenever a user uploads an image, it will be displayed to all users. "Data" contains the file name i.e. "files/dog.png". For some reason, newImg.src only becomes "/static/". My code is shown below:

var chatDiv = document.getElementById('messages');
const newImg = document.createElement("img");
newImg.src = "{{url_for('static', filename = data )}}"

I have already tried to use Jinja2 string interpolation like this:

newImg.src = "{{url_for('static', filename = {{ data }} )}}"

However, this results in the following error:

jinja2.exceptions.TemplateSyntaxError: expected token ':', got '}'

And yes, even after removing the brackets, my code still doesn’t work(pls reopen this post).

Assistance would be much appreciated!


Ok, I was able to find a work around! You have to use .replace to replace the string with another variable.

newImg.src = "{{url_for('static', filename = 'data')}}".replace('data', data)

Answered By – 77 ChickenNug

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