Binding JSON to Array in TypeScript select operations

JSON Example

{
    "bloodTypes":[
      {"Id":1, "Type":"O +", "Description":"Universal donor"}, 
      {"Id":2, "Type":"AB +", "Description":"Universal recipient"}
    ],
    "GenderOptions":[
      {"Id":1, "Value":"Male", "Description":"M"}, 
      {"Id":2, "Value":"Female", "Description":"F"}
    ]
}

Pipe Function:

  transform(list: Lookup[], type: string): Lookup[] {
    if (!list || !type || list.length === 0) {
        return list;
    }

  return Array.of(list[type])
}

Auto-generated Lookup Class (from nswag):

export interface ILookupData {
    name?: string | undefined;
    value?: string | undefined;
    description?: string | undefined;
}

HTML Snippet:

  <option *ngFor="let option of list | lookupFilter:'GenderOptions'" [value]="option.Id">
              {{option.Value}}
  </option>

The select element is not connecting the necessary values. What could be causing this issue?

Answer №1

To improve the function, simply update the code from Array.of(aList[lookUpName]) to aList[lookUpName]. This adjustment will ensure that everything runs smoothly.

 transform(aList: Lookup[], lookUpName: string): Lookup[] {

    if (!aList || !lookUpName || aList.length === 0) {
        return aList;
    }
    return aList[lookUpName];
}

View StackBlitz for more details.

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