Dash DataTables, Flask, and Route Variables

Porter97 · April 9, 2019, 8:43pm

Hello,

I’m trying to hook up Dash DataTables with a dataset API (GET only) that allows users to interact with the dataset. This would require a user to pass through keywords for the datasets they are looking for through the URL. The list of these datasets would also be added and subtracted over time, so hard coding each layout/route is out of the question.

Is there a way (either using flask as the server, or a specifically Dash-based app) that would allow for this kind of dynamic routing and loading of datasets? Or am I better off just using JQuery DataTables?

Thank you,
Spencer

Damian · April 9, 2019, 8:54pm

I’m not sure if this is what you are looking for, but I think if it’s the same app but just different URL query parameters then then you can inspect the dcc.Link at callback time and flask.request.headers.get('Referer', '') at layout time.

Examples of URL handling examples at callback time here: https://dash.plot.ly/urls

And I have a couple of examples of doing the same but at layout time here: Example: Creating Multi-Page and Custom-Page apps at layout time

rafaelc · April 9, 2019, 11:01pm

I don’t know if this helps, but the dcc.Location component has a search property that should return the args passed to the URL (https://github.com/plotly/dash-core-components/blob/master/dash_core_components/Location.py).

You could build some logic into a callback that uses this property as an input and returns a data table

nedned · April 11, 2019, 12:51am

Here’s my current recipe for propagating query parameters from the URL into a URL router if it’s of any help:

github.com

ned2/slapdash/blob/master/src/slapdash/utils.py

import inspect
from functools import wraps
from urllib.parse import parse_qs

import dash
import dash_html_components as html
import dash_bootstrap_components as dbc
from dash.dependencies import Output, Input
from dash.exceptions import PreventUpdate
from dash.development.base_component import Component
from flask import current_app as server
from werkzeug.datastructures import MultiDict

from .pages import page_not_found
from .exceptions import InvalidLayoutError


def component(func):
    """Decorator to help vanilla functions as pseudo Dash Components"""

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Dash DataTables, Flask, and Route Variables

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