Created
September 28, 2018 13:56
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Dash: Shows dcc.Location atributes available in dcc.Link
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import dash | |
import dash_core_components as dcc | |
import dash_html_components as html | |
print(dcc.__version__) # 0.6.0 or above is required | |
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css'] | |
app = dash.Dash(__name__, external_stylesheets=external_stylesheets) | |
app.layout = html.Div([ | |
# represents the URL bar, doesn't render anything | |
dcc.Location(id='url', refresh=False), | |
dcc.Link('Navigate to "/"', href='/'), | |
html.Br(), | |
dcc.Link('Navigate to "/page-2"', href='/page-2'), | |
# content will be rendered in this element | |
html.Div(id='href'), | |
html.Div(id='page-content'), | |
html.Div(id='qs'), | |
html.Div(id='hash') | |
]) | |
@app.callback(dash.dependencies.Output('page-content', 'children'), | |
[dash.dependencies.Input('url', 'pathname')]) | |
def display_page(pathname): | |
return html.Div([ | |
html.H3('You are on page {}'.format(pathname)) | |
]) | |
@app.callback(dash.dependencies.Output('href', 'children'), | |
[dash.dependencies.Input('url', 'href')]) | |
def display_page(href): | |
return html.Div([ | |
html.H3('This is the href: {}'.format(href)) | |
]) | |
@app.callback(dash.dependencies.Output('qs', 'children'), | |
[dash.dependencies.Input('url', 'search')]) | |
def display_page(qs): | |
# Surprinsingly, this callback is called with search = None | |
# before to be called again with the actual url :S | |
print ('This is the query string: {}'.format(qs)) | |
# This callback should not be called when the query string of the url isnt affected!!! | |
return html.Div([ | |
html.H3('This is the query string: {}'.format(qs)) | |
]) | |
# Same here, this callback gets triggered every time with first hash=None and | |
# then hash = actual value and the callback gets called everytime the path | |
# changes, also when the *hash* part hasn't been modified. | |
@app.callback(dash.dependencies.Output('hash', 'children'), | |
[dash.dependencies.Input('url', 'hash')]) | |
def display_page(hash_url): | |
print ('This is the url hash: {}'.format(hash_url)) | |
return html.Div([ | |
html.H3('This is the url hash: {}'.format(hash_url)) | |
]) | |
if __name__ == '__main__': | |
app.run_server(debug=True) |
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