Input value not being displayed in one-way binding

I have a challenge in binding the input value (within a foreach loop) in the HTML section of my component to a function:

<input [ngModel]="getStepParameterValue(parameter, testCaseStep)" required />

...

// Retrieving the previously saved value for this parameter
  getStepParameterValue(parameter: UIParameter, testCaseStep:TestCaseStep) {
    testCaseStep.Parameters.forEach((stepParameter: Parameter) => {
      if (stepParameter.UIOperationParameterName === parameter.UIOperationParameterName)
      {
        if (stepParameter.ParameterValue == null)
        {
          return null;
        }
        console.log("Found value");
        return "Found a Value";
      }
    });

    // No value was found for this parameter
    return null;
  }

Upon viewing the page in a browser, I noticed the following:

https://i.sstatic.net/t9ePN.png

However, none of my inputs display "Found a Value":

https://i.sstatic.net/7B8nX.png

Answer №1

The issue stemmed from my usage of the forEach method without returning a value from it 🤦

I have since updated the code to use a standard for loop, which has resolved the problem:

  getStepParameterValue(parameter: UIParameter, testCaseStep:TestCaseStep) {
    for (let stepParameter of testCaseStep.Parameters) {
      if (stepParameter.UIOperationParameterName === parameter.UIOperationParameterName)
      {
        return stepParameter.ParameterValue;
      }
    };
    return null;
  }

Answer №2

Although you have already found the answer to your question, consider reformatting your code in this way:

fetchParameter(parameter: UIParameter, step: TestCaseStep) {
   const result = step.Parameters.find(
      (param) => param.UIOperationParameterName === parameter.UIOperationParameterName
   );
   return result?.ParameterValue; 
   // Alternatively, if you prefer strict null checking, use result?.ParameterValue ?? null;
}

Furthermore, it is worth noting that directly binding a function call within your template may not be ideal.

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