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usage-remove-selected-elements.py
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usage-remove-selected-elements.py
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import json
import os
import random
import dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html
import dash_cytoscape as cyto
asset_path = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
'..', 'assets'
)
app = dash.Dash(__name__, assets_folder=asset_path)
server = app.server
random.seed(2019)
nodes = [
{'data': {'id': str(i), 'label': 'Node {}'.format(i)}}
for i in range(1, 21)
]
edges = [
{'data': {'source': str(random.randint(1, 20)), 'target': str(random.randint(1, 20))}}
for _ in range(30)
]
default_elements = nodes + edges
styles = {
'json-output': {
'overflow-y': 'scroll',
'height': 'calc(50% - 25px)',
'border': 'thin lightgrey solid'
},
'tab': {'height': 'calc(98vh - 115px)'}
}
app.layout = html.Div([
html.Div(className='eight columns', children=[
cyto.Cytoscape(
id='cytoscape',
elements=default_elements,
layout={
'name': 'grid'
},
style={
'height': '95vh',
'width': '100%'
}
)
]),
html.Div(className='four columns', children=[
dcc.Tabs(id='tabs', children=[
dcc.Tab(label='Actions', children=[
html.Button("Remove Selected Node", id='remove-button')
]),
dcc.Tab(label='Tap Data', children=[
html.Div(style=styles['tab'], children=[
html.P('Node Data JSON:'),
html.Pre(
id='tap-node-data-json-output',
style=styles['json-output']
),
html.P('Edge Data JSON:'),
html.Pre(
id='tap-edge-data-json-output',
style=styles['json-output']
)
])
]),
dcc.Tab(label='Selected Data', children=[
html.Div(style=styles['tab'], children=[
html.P('Node Data JSON:'),
html.Pre(
id='selected-node-data-json-output',
style=styles['json-output']
),
html.P('Edge Data JSON:'),
html.Pre(
id='selected-edge-data-json-output',
style=styles['json-output']
)
])
])
]),
])
])
@app.callback(Output('cytoscape', 'elements'),
[Input('remove-button', 'n_clicks')],
[State('cytoscape', 'elements'),
State('cytoscape', 'selectedNodeData')])
def remove_selected_nodes(_, elements, data):
if elements and data:
ids_to_remove = {ele_data['id'] for ele_data in data}
print("Before:", elements)
new_elements = [ele for ele in elements if ele['data']['id'] not in ids_to_remove]
print("After:", new_elements)
return new_elements
return elements
@app.callback(Output('tap-node-data-json-output', 'children'),
[Input('cytoscape', 'tapNodeData')])
def displayTapNodeData(data):
return json.dumps(data, indent=2)
@app.callback(Output('tap-edge-data-json-output', 'children'),
[Input('cytoscape', 'tapEdgeData')])
def displayTapEdgeData(data):
return json.dumps(data, indent=2)
@app.callback(Output('selected-node-data-json-output', 'children'),
[Input('cytoscape', 'selectedNodeData')])
def displaySelectedNodeData(data):
return json.dumps(data, indent=2)
@app.callback(Output('selected-edge-data-json-output', 'children'),
[Input('cytoscape', 'selectedEdgeData')])
def displaySelectedEdgeData(data):
return json.dumps(data, indent=2)
if __name__ == '__main__':
app.run_server(debug=True)