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Using a decision table inside apps

It is necessary to use Kissflow’s SDK to use a decision table inside apps. Consider a simple use case where a bank needs to approve a loan application based on the applicant’s income. Here’s a step-by-step guide to use a decision table inside apps:

  1. Create a decision table and update it with the following conditions, results, and values.

    Conditions

    Results

    Income

    Eligibility

    >=

    <

     

    15000

     

    Approved

    10000

    15000

    Further review

    0

    10000

    Denied

  2. Create a form: Create a process and add the following fields in the form.

    Field name

    Data type

    Income

    Currency

    Check approval

    Button

    Approved or not?

    Text

  3. Event configuration:

    1. Select the Check approval button, click the Event tab, and click the Add an event button.


       
    2. In the code editor that pops up,

      1. Copy and paste the SDK syntax of getField() from the Kissflow Forms SDK to send the input value to your decision table for evaluation. You can also enter the syntax by typing “get field value” in the code editor and clicking Enter.

        let fieldValue = await kf.context.getField("fieldId");

        Replace “fieldValue” with a custom name of yours (For example, IncomeInput) and “fieldID” with the ID of the Income input field.

        let IncomeInput = await kf.context.getField("Income_process");/p>
         

      2. Copy and paste the SDK syntax of evaluatedecisiontable() from the SDK page.

        let decisionTableInstance = kf.app.getDecisionTable("flowId");
        let decisionOutput = await decisionTableInstance.evaluate({ conditionField1: "value", conditionField2: "value" });

        Replace: 

        let LoanDecisionTable = kf.app.getDecisionTable("Loan_decision_table_A00");
        let Output_of_the_decisiontable = await LoanDecisionTable({ Income_decision_table: IncomeInput});

        • “decisionTableInstance” with a custom name - optional. 

        • "flowId" with the actual ID of your decision table. You can find this ID after the last slash (/) in the decision table’s URL.

        • “decisionOutput” with a custom name.

        • “conditionField” with the ID of the decision table’s condition.

        • “value” with IncomeInput.

      3. Enter the below line of code to get the results from the decision table.

        let outputValue = decisionOutput.Data.at(0);

        Replace “outputValue” with a custom name - optional.
         

      4. Copy and paste the SDK syntax of updateField() from the Kissflow Forms SDK to update the result in a field. You can also enter the syntax by typing “set field value” in the code editor and clicking Enter.

        kf.context.updateField({"fieldId": "value"});

        Replace:

        • “fieldId” with the field ID of the Approved or not? field.

        • “Value” with “outputValue?.Eligibility_decision_table”.

        kf.context.updateField({Approved_or_not: outputValue?.Eligibility});

      5. Click Save.

  4. Deploy the app: Deploy the app to the production environment. In the process form, enter a value in the Income input field and click the Check approval button in the process form. The result from the decision table will be shown in the Approved or not? field.