How to create a refresh button in Flask?

Question

My app takes some parameters from a form, uses it as input for another script, and then returns the output. How can I create a refresh button to redirect the user on the initial page without output? I tried this code in the template:

<form action= {{url_for('index')}} method='POST'> 
    <input type='submit' value="REFRESH">
</form>

But this gave me an error that the "View function did not return a response". I also tried:

<form action= {{redirect(url_for('index'))}} method='POST'>
    <input type='submit' value="REFRESH">
</form>

But this gave me the error "'redirect' is undefined" even though my view imported both redirect and url_for.

possible duplicate of ValueError: View function did not return a response in flask — dirn
– dirn, Commented Mar 3, 2015 at 13:40

dirn · Accepted Answer · 2015-02-27 13:13:52Z

7

You don't need to submit a form to clear the values in it. You can use a reset button.

<input type="reset" value="REFRESH">

This will restore the values -- or lack thereof -- from when the page loaded.

answered Feb 27, 2015 at 13:13

dirn

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4 Comments

Denis Over a year ago

Thanks for Your reply. But the suggested solutions will clear only the submit form . But my python script also prints out onto web page some python objects such as lists, dictionary and etc. So it would be great to have button to return to the initial web page (index.html) with clear submit form and also without any python objects.

dirn Over a year ago

You don't need a POST for that. You don't even need a form. A link will be sufficient. <a href="{{ url_for('index') }}">REFRESH</a>. That said, your view needs to return a response. Search this site for your error and you'll find other who have asked the question.

Denis Over a year ago

Thanks a lot. Your solution is exactly what i need, i only slightly modified it. Now there are no errors. <a href="{{ url_for('index') }}"><button>REFRESH</button></a>

Trect Over a year ago

<a href="{{ url_for('index') }}"><button>REFRESH</button></a> is better

Trect · Accepted Answer · 2018-10-17 10:53:02Z

4

Use <a href="{{ url_for('index') }}"><button>REFRESH</button></a>

answered Oct 17, 2018 at 10:53

Trect

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