Dynamic Custom Component

[noodleslove]

Is it possible to create a custom component that takes in a JSON input, then parse the JSON object and add additional input fields to itself. For instance, this component initially has one input fields which should take in a JSON object.

{
  "name": "dynamic input fields",
  "inputs": [
    {"name": "message", "type": "string"},
    {"name": "group name", "type": "string"}
  ]
}

Once the component receives the JSON input, it adds additional "message" and "name" to its input fields. Is it possible to do this?

[dosubot[bot]]

Hey there, @noodleslove! I'm here to help you out while you wait for a human maintainer. Let's tackle this issue together!

Yes, it is possible to create a custom component that takes a JSON input, parses it, and dynamically adds additional input fields based on the JSON structure. You can use a class similar to the CustomComponent in Langflow to achieve this. Here's a simplified example of how you might implement such a component:

from langflow.custom import Component
from langflow.io import StrInput, Output
from langflow.schema import Data
import json

class DynamicInputComponent(Component):
    display_name = "Dynamic Input Component"
    description = "Parses JSON input and dynamically adds input fields."

    inputs = [
        StrInput(name="json_input", display_name="JSON Input", value="{}", input_types=["Data"]),
    ]

    outputs = [
        Output(display_name="Output", name="output", method="build_output"),
    ]

    async def build_output(self) -> Data:
        try:
            json_data = json.loads(self.json_input)
            # Logic to dynamically add input fields based on json_data
            for input_field in json_data.get("inputs", []):
                # Add logic to create input fields dynamically
                print(f"Name: {input_field['name']}, Type: {input_field['type']}")
            
            self.status = "Inputs created successfully"
            return Data(value=json_data)
        except json.JSONDecodeError:
            self.status = "Invalid JSON input"
            return Data(value={})

This component takes a JSON string as input, parses it, and can be extended to dynamically create input fields based on the parsed JSON structure ^[1].

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[noodleslove]

@dosu Can you elaborate on the code that add additional input fields to the component dynamically? I've been stuck with trying to create new input fields in the component dynamically after it parses the JSON object. If you could provide some code examples, that would be very helpful.

[dosubot[bot]]

To dynamically add input fields to a component after parsing a JSON object, you can modify the component's internal structure to accommodate new fields. Here's an example of how you might implement this in a custom component:

from langflow.custom import Component
from langflow.io import StrInput, Output
from langflow.schema import Data
import json

class DynamicInputComponent(Component):
    display_name = "Dynamic Input Component"
    description = "Parses JSON input and dynamically adds input fields."

    inputs = [
        StrInput(name="json_input", display_name="JSON Input", value="{}", input_types=["Data"]),
    ]

    outputs = [
        Output(display_name="Output", name="output", method="build_output"),
    ]

    async def build_output(self) -> Data:
        try:
            json_data = json.loads(self.json_input)
            # Logic to dynamically add input fields based on json_data
            additional_inputs = []
            for input_field in json_data.get("inputs", []):
                # Create new input fields dynamically
                new_input = StrInput(
                    name=input_field['name'],
                    display_name=input_field['name'].replace("_", " ").title(),
                    value="",
                    input_types=["Data"]
                )
                additional_inputs.append(new_input)
            
            # Update the component's inputs with the new fields
            self.inputs.extend(additional_inputs)
            
            self.status = "Inputs created successfully"
            return Data(value=json_data)
        except json.JSONDecodeError:
            self.status = "Invalid JSON input"
            return Data(value={})

In this example, the build_output method parses the JSON input and iterates over the inputs array in the JSON. For each input field specified in the JSON, it creates a new StrInput and appends it to the component's inputs list. This effectively adds new input fields to the component dynamically based on the JSON structure.

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